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WO2016080169A1 - Surface light emitting unit - Google Patents

Surface light emitting unit Download PDF

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Publication number
WO2016080169A1
WO2016080169A1 PCT/JP2015/080511 JP2015080511W WO2016080169A1 WO 2016080169 A1 WO2016080169 A1 WO 2016080169A1 JP 2015080511 W JP2015080511 W JP 2015080511W WO 2016080169 A1 WO2016080169 A1 WO 2016080169A1
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
light
optical adjustment
adjustment member
region
Prior art date
Application number
PCT/JP2015/080511
Other languages
French (fr)
Japanese (ja)
Inventor
祐亮 平尾
孝二郎 関根
昌宏 今田
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2016560137A priority Critical patent/JPWO2016080169A1/en
Publication of WO2016080169A1 publication Critical patent/WO2016080169A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00Globes; Bowls; Cover glasses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/08Mirrors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/87Passivation; Containers; Encapsulations
    • H10K59/871Self-supporting sealing arrangements

Definitions

  • This disclosure relates to a surface light emitting unit including a surface light emitting panel.
  • a general tablet terminal 50 includes a casing 51 and a plurality of display units 52 to 55.
  • the thickness T of the tablet terminal 50 is, for example, 7 mm or less.
  • the front side shown in FIG. 15 will be described as an example.
  • the backlight and illumination built in the terminal 50 are required to be able to emit light up to a portion near the end of the casing 51.
  • a surface light-emitting unit including a surface light-emitting panel can be applied not only to a backlight but also to the lighting field.
  • An organic EL is known as an example of a surface emitting panel.
  • Organic EL is expected to be a new light source because it is a thin surface emitting panel and has flexibility.
  • a surface light emitting panel such as an organic EL
  • sealing is generally performed around the light emitting portion in order to protect the light emitting portion (such as a light emitting layer or a light emitting element) from moisture and oxygen.
  • the sealing part is provided so as to cover the light emitting part, the sealing part has a larger area than the light emitting part. For this reason, not only a light emitting region that actually emits light but also a non-light emitting region that emits little or no light is formed on the surface of the surface light emitting panel that emits light (light emitting surface).
  • this surface emitting panel is used for the backlight of the tablet terminal as shown in FIG. 15, the area that does not emit light cannot be used for illumination of the display unit, and is the portion of the frame in FIG.
  • width W width W
  • the width W must be increased, and the display portion is relatively small. Therefore, it is required to make the width of the non-light emitting region as small as possible.
  • Patent Document 1 a side wall having an inclined shape is arranged around the light emitting surface of the flat light source, and a predetermined interval is provided from the light emitting surface. Light is guided to the backlight surface. Thereby, the backlight system enlarges the area of the light emitting region.
  • An LED (Light Emitting Diode) illumination device disclosed in Japanese Patent Application Laid-Open No. 2013-145723 (Patent Document 2) divides a light-transmitting diffusion plate on the light projecting side of an LED light-emitting unit to separate the light from the LED. It diffuses and reduces glare.
  • the organic EL element disclosed in Japanese Patent Application Laid-Open No. 2011-243448 has a light reflecting layer made of a specular metal film in a portion other than the light emitting surface, so that it can be used originally. The effective use of the light that did not exist.
  • the backlight system disclosed in Patent Document 1 needs to reflect the light emitted from the first light emitting surface by the side wall and take it out from the second light emitting surface. For this reason, a distance must be provided between the first light emitting surface and the second light emitting surface, which increases the thickness of the backlight system.
  • the LED illumination device disclosed in Patent Document 2 must be provided with a light transmissive diffusion plate spaced apart, which increases the thickness of the LED illumination device.
  • the organic EL element disclosed in Patent Document 3 has a large luminance difference between the light emitting region and the non-light emitting region, and is difficult to recognize as one surface emitting panel. Therefore, a person who sees the organic EL element recognizes the non-light emitting area.
  • the present disclosure has been made in order to solve the above-described problems, and an object in one aspect is to provide a surface light emitting unit capable of making a non-light emitting region less noticeable than the conventional one while keeping the thickness thin. Is to provide.
  • the surface light emitting unit includes a surface light emitting panel having a light emitting surface, a first transmissive member having a front surface and a back surface, and provided so that the light emitting surface and the back surface face each other, An optical adjustment member for reducing light from the surface of the first transmission member; and an optical adjustment member on a surface opposite to the first transmission member side. And a diffusing member provided to face each other.
  • the light emitting surface of the surface light emitting panel includes a light emitting region that emits light and a non-light emitting region that is located on the outer periphery of the light emitting region and does not emit light. At least a portion of the optical adjustment member is provided to face the light emitting region.
  • the width in the predetermined direction within the surface of the optical adjustment member is shorter than the width in the predetermined direction of the light emitting region in at least one direction within the surface.
  • the surface light emitting unit can make the non-light emitting region less noticeable than the conventional one while keeping the thickness thin.
  • FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is an arrow directional cross-sectional view of a surface emitting panel. It is a top view which shows a surface emitting panel, and is equivalent to the surface emitting panel 20 seen from the arrow IV direction in FIG. It is a top view which shows a surface emitting panel and an optical adjustment member, and is equivalent to the surface emitting unit seen from the I direction in FIG.
  • FIG. 1 It is a top view which shows the surface emitting panel and optical adjustment member according to a modification, and is equivalent to the surface emitting panel and optical adjustment member seen from the I direction in FIG. It is a figure which shows sectional drawing of the surface emitting unit according to Embodiment 2, and is arrow sectional drawing along the II-II line in FIG. It is a top view which shows a surface emitting panel and a reflecting member, and is equivalent to the surface emitting panel and reflecting member seen from the VIII direction in FIG. It is the figure which showed the light distribution curve of the surface emitting unit according to Embodiment 3 by the vertical in-plane light distribution.
  • 10 is a graph showing an aperture ratio and an aperture width of an optical adjustment member in Example 5.
  • It is a perspective view which shows the structure of the back surface side of the tablet terminal which has a general structure.
  • FIG. 1 is a plan view showing the surface light emitting unit 100, and corresponds to the surface light emitting unit 100 viewed from the direction of arrow I in FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
  • the surface light emitting unit 100 includes a surface light emitting panel 20, a transmissive member 21 (first transmissive member), an optical adjustment member 22, and a transmissive member 24 (second transmissive member). And a diffusing member 26.
  • FIG. 3 is a cross-sectional view of the surface light emitting panel 20 as viewed from the direction of the arrow.
  • FIG. 4 is a plan view showing the surface light emitting panel 20, and corresponds to the surface light emitting panel 20 viewed from the direction of arrow IV in FIG.
  • the surface light emitting panel 20 includes an anode 12, a light emitting layer 13, a cathode 14, a sealing member 15, and an insulating layer 16.
  • the anode 12 is a conductive film having transparency.
  • the anode 12 is formed, for example, by depositing ITO on the transmission member 21 (see FIG. 2).
  • the ITO film for forming the anode 12 is divided into two regions by patterning in order to form the electrode extraction part 17 (for anode) and the electrode extraction part 18 (for cathode).
  • the ITO film of the electrode extraction portion 18 is connected to the cathode 14.
  • the light emitting layer 13 generates light when supplied with electric power.
  • the light emitting layer 13 is configured by laminating a single layer or a plurality of layers.
  • the cathode 14 is made of aluminum (AL), for example, and is formed so as to cover the light emitting layer 13.
  • the insulating layer 16 is provided between the cathode 14 and the anode 12. A portion of the cathode 14 opposite to the side where the insulating layer 16 is located is connected to the electrode extraction portion 18.
  • the sealing member 15 is made of glass, thin film glass, resin film, or the like.
  • the sealing member 15 seals the anode 12, the light emitting layer 13, and the cathode 14 on the transmission member 21 (see FIG. 2).
  • the electrode extraction parts 17 and 18 are exposed from the sealing member 15 for electrical connection.
  • the electrode extraction portions 17 and 18 are electrically connected to an external power source through a wiring member (not shown).
  • the surface emitting panel 20 may be a so-called bottom emission type organic EL element or a top emission type organic EL element. Or the surface emitting panel 20 may be comprised from an inorganic EL element, and may be comprised from several light emitting diode (LED). Moreover, the surface emitting panel 20 may be a single-sided light emitting device or a double-sided light emitting device.
  • LED light emitting diode
  • Light emitting area RA and non-light emitting area RB of the surface light emitting panel 20 With reference to FIGS. 1 to 3 again, the light emitting area RA and the non-light emitting area RB of the surface light emitting panel 20 will be described.
  • power is supplied to the light emitting layer 13 through a wiring member (not shown), electrode extraction portions 17 and 18, the anode 12 (transparent electrode), and the cathode 14.
  • Light is generated in the light emitting layer 13, and a part of the light passes through the anode 12 and the transmissive member 21 as it is, and is extracted from the light emitting surface 20 ⁇ / b> S, and the other part of the light is reflected by the cathode 14 and then the anode 12. Then, the light passes through the transmissive member 21 and is taken out from the light emitting surface 20S.
  • the light emitting surface 20S of the surface light emitting panel 20 includes a light emitting area RA and a non-light emitting area RB.
  • the light emitting region RA is a region on the light emitting layer 13, and the light generated in the light emitting layer 13 is emitted from the light emitting region RA (see the white arrow in FIG. 3).
  • the non-light emitting region RB is located on the outer periphery of the light emitting region RA and emits little or no light.
  • the non-light emitting region RB is formed so as to surround the light emitting region RA by providing the sealing member 15 and the electrode extraction portions 17 and 18 on the surface light emitting panel 20.
  • the light emitting region RA and the non-light emitting region RB are partitioned by a boundary line indicated by a one-dot chain line.
  • the boundary line is formed in a rectangular shape having points P1, P2, Q1, and Q2 as four vertices.
  • a rectangular light-emitting region RA is located inside the boundary line, and an annular shape is formed outside the boundary line.
  • the non-light emitting region RB is located.
  • the width LA of the light emitting region RA is, for example, 3.5 mm
  • the width LB of the non-light emitting region RB is, for example, 2 mm or more.
  • the transmission member 21 is composed of a flat plate member having a front surface 21A and a back surface 21B.
  • the transmissive member 21 is provided so that the back surface 21 ⁇ / b> B faces the light emitting surface 20 ⁇ / b> S of the surface light emitting panel 20.
  • the rear surface 21B of the transmissive member 21 and the front surface 20A of the surface light emitting panel 20 are in contact with each other.
  • the transmissive member 21 a material having high transmittance (for example, a total light transmittance in a visible light wavelength region measured by a method based on JIS K 7361-1: 1997 is 80% or more) and excellent in flexibility is used. It is preferable to be used.
  • the transmissive member 21 is made of a transparent resin film such as PMMA (Polymethyl Methacrylate). The thickness of PMMA is 0.2 mm, for example.
  • the light emitted from the light emitting area RA enters the inside from the back surface 21B of the transmissive member 21.
  • the incident light passes through the inside of the transmissive member 21 and is emitted as it is from the surface 21A of the transmissive member 21, or the interface between the transmissive member 21 and the optical adjustment member 22, or between the transmissive member 21 and the transmissive member 24.
  • the light After being reflected at the interface between them and propagating in the in-plane direction inside the transmissive member 21, the light is emitted from the surface 21 ⁇ / b> A of the transmissive member 21.
  • the optical adjustment member 22 has a front surface 22A and a back surface 22B.
  • the optical adjustment member 22 is provided so as to face the surface 21 ⁇ / b> A of the transmission member 21.
  • the optical adjustment member 22 is provided on the surface 21 ⁇ / b> A of the transmission member 21 by applying white ink by inkjet onto the surface 21 ⁇ / b> A of the transmission member 21.
  • the width LC of the optical adjustment member 22 in the surface direction (left and right direction in FIG. 2) is, for example, 3 mm.
  • the width LC of the optical adjustment member 22 is shorter than the width LA of the light emitting region RA of the surface light emitting panel 20.
  • the optical adjustment member 22 has a function of dimming light from the surface 21A of the transmission member 21. More specifically, the optical adjustment member 22 transmits part of the light reaching the back surface 22B of the optical adjustment member 22 from the front surface 21A of the transmission member 21, or the optical adjustment member 22 of the optical adjustment member 22 from the front surface 21A of the transmission member 21. The other part of the light reaching the back surface 22B is reflected, or the other part of the light reaching the back surface 22B of the optical adjustment member 22 from the front surface 21A of the transmission member 21 is absorbed. As an example, the light reflectance of the optical adjustment member 22 is 47.5%. The light transmittance of the optical adjustment member 22 is 47.5%. The optical absorptivity of the optical adjustment member 22 is 5.0%. A part of the light reflected by the optical adjustment member 22 propagates again in the in-plane direction (the left-right direction in FIG. 2) inside the transmission member 21.
  • the optical adjustment member 22 is preferably composed of a member containing a scattering material.
  • the scattering material include inorganic fine particles such as titanium oxide, barium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, and silica.
  • organic (crosslinked) fine particles such as acrylic resin, organic silicone resin, polystyrene resin, urea resin, formaldehyde condensate, and fluorine resin are also included.
  • polyolefin resins represented by polymethylpentene, polypropylene, polyethylene, alicyclic olefins dispersed in islands, polyester resins represented by polyethylene terephthalate, polyethylene-2, 6-naphthalate, etc.
  • thermoplastic resins including various copolymers
  • acrylic resins typified by polymethyl methacrylate and the like
  • hollow particles or bubbles may be mentioned.
  • the particles one kind may be used alone, or two or more kinds may be used in combination.
  • the optical adjustment member 22 may be a sheet-like member or a film-like member as long as it has a function of reducing light from the surface 21A of the transmission member 21. These members may be attached to the surface 21A of the transmissive member 21 using a transparent optical adhesive or the like, or face the surface 21A of the transmissive member 21 with a slight gap. May be provided. When the interval is provided, the back surface 22 ⁇ / b> B of the optical adjustment member 22 is preferably parallel to the surface 21 ⁇ / b> A of the transmission member 21.
  • FIG. 5 is a plan view showing the surface light emitting panel 20 and the optical adjustment member 22 and corresponds to the surface light emitting unit 100 viewed from the I direction in FIG.
  • the configuration of the surface light emitting unit 100 other than the surface light emitting panel 20 and the optical adjustment member 22 is omitted in FIG.
  • At least a part of the optical adjustment member 22 is provided to face the light emitting area RA of the surface light emitting panel 20.
  • the optical adjustment member 22 is provided so as not to overlap at least a part of the light emitting region RA.
  • the size of the optical adjustment member 22 is smaller than the size of the light emitting region RA, and the optical adjustment member 22 is provided in the plane of the light emitting region RA.
  • the width in the predetermined direction (for example, width X1, Y1) in the plane of the optical adjustment member 22 is the width in the predetermined direction (for example, width X2, Y2) of the light emitting region RA in at least one direction in the plane. Shorter than.
  • the “width in a predetermined direction within the surface of the optical adjustment member 22” here refers not only to the width X1 and the width Y1 corresponding to the length of the side of the optical adjustment member 22, but also to the oblique angle within the surface of the optical adjustment member 22. Including the width corresponding to the direction.
  • the surface light emitting panel 20 and the optical adjustment member 22 are arranged, so that light is reduced in the central portion in the light emitting area RA where the optical adjustment member 22 is covered.
  • light is not dimmed at the outer peripheral portion in the light emitting area RA where the optical adjustment member 22 is not covered.
  • the surface emitting unit 100 can make the non-light emitting region RB located around the light emitting region RA appear bright.
  • the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB, and the non-light emitting area RB looks as if it is shining in the same way as the light emitting area RA. Can do. For this reason, the non-light emitting region RB is less noticeable.
  • the optical adjustment member 22 is provided by applying white ink to the surface 21A of the transmission member 21 by ink jetting, even if the optical adjustment member 22 is provided in the surface light emitting unit 100, surface light emission.
  • the thickness of the unit 100 hardly increases.
  • FIG. 6 is a plan view showing the surface light-emitting panel 20 and the optical adjustment member 22 according to the modification, and corresponds to the surface light-emitting panel 20 and the optical adjustment member 22 viewed from the I direction in FIG.
  • the configuration of the surface light emitting unit 100 other than the surface light emitting panel 20 and the optical adjustment member 22 is omitted in FIG. 6.
  • the width of the optical adjustment member 22 in a predetermined direction is shorter than the width of the light emitting region RA in at least one direction, and at least a part of the optical adjustment member 22 is provided to face the light emitting region RA of the surface light emitting panel 20.
  • the positional relationship and size between the light emitting region RA and the optical adjustment member 22 are not particularly limited. For example, as shown in FIG. 6, if the width Y1 of the optical adjustment member 22 is shorter than the width Y2 of the light emitting region RA, the width X1 of the optical adjustment member 22 may be longer than the width X2 of the light emitting region RA. .
  • the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB in the vertical direction of the paper in FIG. 6. Can be small. As a result, the surface light emitting unit 100 can appear as if the non-light emitting region RB is shining in the same manner as the light emitting region RA in the vertical direction of the drawing in FIG.
  • the transmission member 24 is composed of a flat plate member having a front surface 24A and a back surface 24B.
  • the transmissive member 24 is provided such that the back surface 24 ⁇ / b> B faces the front surface 22 ⁇ / b> A of the optical adjustment member 22.
  • the transmissive member 24 is made of a material having a high transmittance (for example, a total light transmittance of 80% or more in a visible light wavelength region measured by a method according to JIS K 7361-1: 1997) and excellent flexibility. It is preferable to be used.
  • the transmissive member 24 is made of a transparent resin film such as PMMA.
  • the thickness of PMMA is 0.22 mm, for example.
  • the light from the front surface 22A of the optical adjustment member 22 enters the inside from the back surface 24B of the transmission member 24.
  • the incident light passes through the inside of the transmissive member 24 and is emitted as it is from the surface 24 A of the transmissive member 24, or is reflected at the interface between the transmissive member 24 and the diffusing member 26 and is in-plane within the transmissive member 24.
  • the light After being transmitted in the direction (left and right direction in FIG. 2), the light is emitted from the surface 24A of the transmission member 24.
  • the diffusing member 26 is configured by a flat member having a front surface 26A and a back surface 26B.
  • the diffusing member 26 is provided so as to face the surface (surface 22A) opposite to the transmitting member 21 side of the optical adjusting member 22.
  • the diffusing member 26 is provided at a distance from the surface 22 ⁇ / b> A of the optical adjustment member 22, and the transmissive member 24 is provided between the transmissive member 21 and the diffusing member 26.
  • the diffusion member 26 is provided so that the back surface 26 ⁇ / b> B is in contact with the front surface 24 ⁇ / b> A of the transmission member 24.
  • the diffusing member 26 is provided such that its back surface 26B is in contact with the surface 22A of the optical adjusting member 22. That is, in this case, the transmission member 24 is not provided between the optical adjustment member 22 and the diffusion member 26.
  • the diffusing member 26 has a function of diffusing light emitted from the surface 24A of the transmitting member 24 and reaching the diffusing member 26.
  • the diffusing member 26 is composed of, for example, a sheet-like member or a film-like member. More specifically, as the diffusing member 26, the surface of a resin member such as acrylic or polycarbonate is subjected to minute unevenness processing (that is, one using an interface reflection action), or the base material is represented by titanium oxide. A material in which a scattering material containing white scattering particles is uniformly dispersed (that is, a material using an internal scattering effect) or the like can be used.
  • the diffusion member 26 has a Haze value of 90%, for example.
  • the diffusion member 26 is provided at a distance H (see FIG. 2) from the surface 20A of the surface light emitting panel 20.
  • a distance H see FIG. 2
  • the surface emitting unit 100 can appear as if the non-light emitting region RB is shining.
  • the distance H between the surface light emitting panel 20 and the diffusing member 26 is longer than the width W2 of the non-dimming region (see FIG. 2). Accordingly, the surface light emitting unit 100 can reduce the luminance difference between the area that is dimmed by the optical adjustment member 22 and the area that is not dimmed. Can be recognized as one light source.
  • the optical adjustment member 22 is provided so as to face the light emitting region RA of the surface light emitting panel 20. Further, the width in the predetermined direction in the plane of the optical adjustment member 22 is shorter than the width in the predetermined direction of the light emitting region RA in at least one direction in the plane. Thereby, light is attenuated in the central portion in the light emitting region RA where the optical adjustment member 22 is covered, and light is not attenuated in the outer peripheral portion in the light emitting region RA where the optical adjustment member 22 is not covered.
  • the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB, and the non-light emitting area RB looks as if it is shining in the same way as the light emitting area RA. Can do. For this reason, the non-light emitting region RB is less noticeable.
  • each of the surface light emitting panel 20, the transmissive member 21, the optical adjusting member 22, the transmissive member 24, and the diffusing member 26 is provided such that the interfaces thereof are in contact with each other. More specifically, the light emitting surface 20 ⁇ / b> S of the surface light emitting panel 20 is in contact with the back surface 21 ⁇ / b> B of the transmissive member 21. The front surface 21 ⁇ / b> A of the transmissive member 21 is in contact with one surface (back surface 22 ⁇ / b> B) of the optical adjustment member 22. The other surface (front surface 22A) of the optical adjustment member 22 is in contact with the back surface 24B of the transmission member 24. The front surface 24 ⁇ / b> A of the transmission member 24 is in contact with one surface (back surface 26 ⁇ / b> B) of the diffusion member 26.
  • the surface emitting unit 100 can increase the proportion of light emitted to the viewing side. Further, the light emitted from the light emitting area RA of the surface light emitting panel 20 is often inclined in the area on the non-light emitting area RB than the area on the light emitting area RA.
  • the surface light emitting unit 100 suppresses total reflection and Fresnel loss that occur between the interface of each component and air in the region on the non-light emitting region RB. Can do. As a result, the surface light emitting unit 100 can increase the luminance of the region corresponding to the non-light emitting region RB.
  • FIG. 7 is a cross-sectional view of the surface emitting unit 100A, and is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 8 is a plan view showing the surface light emitting panel 20 and the reflecting member 30 and corresponds to the surface light emitting panel 20 and the reflecting member 30 as viewed from the VIII direction in FIG.
  • the configuration of the surface light emitting unit 100A other than the surface light emitting panel 20 and the reflecting member 30 is omitted in FIG.
  • the surface light emitting unit 100A further includes a reflecting member 30 in addition to the configuration of the surface light emitting unit 100 according to the first embodiment.
  • the reflection member 30 is provided on the non-light emitting region RB located around the light emitting region RA of the surface light emitting panel 20.
  • the reflection member 30 may be formed on the entire non-light emitting region RB, or may be formed on a part of the non-light emitting region RB.
  • the reflecting member 30 has a light reflecting function or a scattering function.
  • a specular reflecting member is used as the reflecting member 30, for example.
  • the material used for the reflecting member 30 include polymer materials such as PET (polyethylene terephthalate), metals such as Al and Ag.
  • the reflecting member 30 may be made of an organic solvent-based white ink in which scattering particles are dispersed.
  • the scattering reflection surface by the reflection member 30 can be formed by, for example, applying white ink to the back surface 21B of the transmission member 21 by inkjet.
  • the reflection member 30 reflects the light reflected at the interface between the transmission member 21 and the optical adjustment member 22 or the interface between the transmission member 21 and the transmission member 24 toward the viewing side of the surface emitting unit 100A. Thereby, the surface emitting unit 100A can radiate more light from the region on the non-light emitting region RB. As a result, the surface light emitting unit 100A can increase the luminance of the non-light emitting region RB.
  • FIG. 9 is a diagram showing a light distribution curve of the surface light emitting panel 20 used in the surface light emitting unit 100B as a vertical in-plane light distribution.
  • more light is emitted in an oblique direction in order to collect more light in non-light emitting region RB of surface emitting panel 20. Since the configuration of surface emitting unit 100B is the same as that of surface emitting unit 100 according to the first embodiment, description thereof will not be repeated.
  • the surface light emitting unit 100B draws a light distribution curve in a plane perpendicular to the light emitting surface 20S (see FIG. 3) of the light emitted from the surface light emitting panel 20, the normal direction of the light emitting surface 20S (that is, FIG. 3).
  • the light distribution curve satisfies the condition of L> cos ⁇ . At least.
  • the condition of L> cos ⁇ when the luminance is higher than the light distribution curve 31 at least in part. Is satisfied.
  • the light distribution curve 32 shown as “oblique light distribution” in FIG. 9 satisfies the condition of L> cos ⁇ .
  • the light distribution curve 32 generally satisfies the condition of L> cos ⁇ at ⁇ 80 ° ⁇ ⁇ ⁇ ⁇ 60 ° and 60 ° ⁇ ⁇ 80 °.
  • the surface emitting unit 100B distributes light so as to satisfy the condition of L> cos ⁇ .
  • the surface light emitting unit 100B can guide more light to the region on the non-light emitting region RB, and can reduce the luminance difference between the light emitting region RA and the non-light emitting region RB.
  • the surface light emitting unit 100B can make the non-light-emitting area RB appear to shine like the light-emitting area RA, and the non-light-emitting area RB becomes inconspicuous.
  • FIGS. 10 to 13 a simulation performed on the above-described embodiment will be described.
  • the simulation is a comparison between Examples 1 to 5 based on the above-described embodiment and a comparative example not based on the above-described embodiment.
  • the difference between the first to fifth embodiments and the comparative example is mainly that the optical adjusting member 22 is provided in the first to fifth embodiments, and the optical adjusting member 22 is not provided in the comparative example.
  • the configuration of the comparative example and the configurations of Examples 1 to 5 will be described in order, and then the simulation results of the comparative example and Examples 1 to 5 will be described.
  • FIG. 10 is a cross-sectional view of the surface light emitting unit 200, and is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 11 is a table showing the difference in configuration of the surface emitting units according to the comparative example and Examples 1 to 5.
  • the surface light emitting unit 200 includes a surface light emitting panel 20 having a light emitting area RA and a non-light emitting area RB, a transmissive member 21, and a diffusing member 26. As shown in FIGS. 10 and 11, the surface emitting unit 200 is not provided with the optical adjustment member 22.
  • the width LA of the light emitting area RA of the surface light emitting panel 20 is 3.5 mm.
  • the non-light emitting area RB of the surface light emitting panel 20 is located around the light emitting area RA, and the width LB of the non-light emitting area RB is 2 mm or more.
  • the transmission member 21 is made of PMMA.
  • the thickness of the transmissive member 21 is 0.42 mm.
  • the diffusing member 26 is composed of a white scattering sheet having a light transmittance of 50%.
  • the Haze value of the diffusing member 26 is 90%.
  • Light distribution from the light emitting area RA is Lambert light distribution.
  • the back surface of the light emitting region RA is a reflective electrode having a reflectance of 70%, and the back surface of the non-light emitting region RB is a metal reflecting surface having a reflectance of 60%.
  • the surface light emitting unit includes a surface light emitting panel 20, a transmission member 21, an optical adjustment member 22, a transmission member 24, and a diffusion member 26.
  • the surface light emitting panel 20 has a light emitting area RA and a non-light emitting area RB.
  • the width LA of the light emitting area RA is 3.5 mm.
  • the non-light emitting region RB is located around the light emitting region RA, and the width LB of the non-light emitting region RB is 2 mm or more.
  • the back surface of the light emitting area RA is composed of a reflective electrode having a reflectance of 70%.
  • the back surface of the non-light emitting region RB is composed of a metal reflecting surface with a reflectance of 60%.
  • the transmission member 21 is made of PMMA.
  • the thickness of the transmissive member 21 is 0.2 mm.
  • the optical adjustment member 22 is composed of a white scattering sheet having a transmittance of 50%.
  • the haze value of the optical adjustment member 22 is 99%.
  • the transmission member 24 is made of PMMA.
  • the thickness of the transmissive member 21 is 0.22 mm. The interfaces of the transmission member 21, the optical adjustment member 22, and the transmission member 24 are in contact with each other.
  • Example 1 the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9).
  • the reflectance of the optical adjustment member 22 is 47.5%.
  • the transmittance of the optical adjustment member 22 is 47.5%.
  • the absorptance of the optical adjustment member 22 is 5.0%.
  • the width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 3 mm.
  • the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9).
  • the reflectance of the optical adjustment member 22 is 47.5%.
  • the transmittance of the optical adjustment member 22 is 47.5%.
  • the absorptance of the optical adjustment member 22 is 5.0%.
  • the width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 0.5 mm.
  • the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9).
  • the reflectance of the optical adjustment member 22 is 30.0%.
  • the transmittance of the optical adjustment member 22 is 65.0%.
  • the absorptance of the optical adjustment member 22 is 5.0%.
  • the width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 2.75 mm.
  • the light distribution of the surface light emitting panel 20 is an oblique light distribution (see FIG. 9).
  • the reflectance of the optical adjustment member 22 is 47.5%.
  • the transmittance of the optical adjustment member 22 is 47.5%.
  • the absorptance of the optical adjustment member 22 is 5.0%.
  • the width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 3 mm.
  • the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9).
  • the reflectance of the optical adjustment member 22 is 90%.
  • the transmittance of the optical adjustment member 22 is 0%.
  • the absorptance of the optical adjustment member 22 is 10%.
  • the width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 2.83 mm.
  • the optical adjustment member 22 is provided with openings at random, and has a pattern with a predetermined opening ratio and a predetermined opening width in the longitudinal direction of the cross section (that is, the left and right direction in FIG. 2). .
  • FIG. 12 is a graph showing the aperture ratio and the aperture width of the optical adjustment member 22 in Example 5.
  • the horizontal axis shown in the graph of FIG. 12 indicates the position of the optical adjustment member 22 with respect to the longitudinal direction of the cross section of the optical adjustment member 22.
  • the position “0” on the horizontal axis corresponds to the center of the optical adjustment member 22.
  • FIG. 12 shows two of the aperture ratio of the optical adjustment member 22 and the aperture width of the optical adjustment member 22.
  • the “aperture ratio” here refers to the ratio of the opening width to the predetermined width.
  • the “opening width” refers to the width of each hole provided in the predetermined width.
  • FIG. 13 is a diagram illustrating luminance profiles of the surface light emitting unit 200 according to the comparative example and the surface light emitting units according to the first and second embodiments.
  • FIG. 14 is a diagram showing luminance profiles of the surface light emitting unit 200 according to the comparative example and the surface light emitting units according to the examples 3 to 5.
  • the horizontal axis shown in the graphs of FIG. 13 and FIG. 14 indicates the position of the diffusing member 26 in the left-right direction in FIG.
  • the position “0” on the horizontal axis corresponds to the center position of the diffusion member 26.
  • the vertical axis shown in the graphs of FIGS. 13 and 14 indicates the normalized luminance with the luminance at the brightest position (that is, position 0 mm) as 1000.
  • the normalized luminance is the luminance on the diffusing member 26.
  • the brightness of the region corresponding to the non-light emitting region RB (that is, the position of less than ⁇ 1.75 mm and 1.75 mm or more) is higher in all of Examples 1 to 5 than in the comparative example. Is also high. That is, it can be seen that the relative luminance of the non-light-emitting area RB with respect to the light-emitting area RA is increased, and the non-light-emitting area RB is less conspicuous than the light-emitting area RA.
  • the surface light emitting unit described above includes a surface light emitting panel having a light emitting surface, a first transmissive member having a front surface and a back surface, and the light emitting surface and the back surface being opposed to each other; An optical adjustment member for reducing light from the surface of the first transmission member, and a surface opposite to the first transmission member side of the optical adjustment member.
  • An optical adjustment member for reducing light from the surface of the first transmission member, and a surface opposite to the first transmission member side of the optical adjustment member.
  • the light emitting surface of the surface light emitting panel includes a light emitting region that emits light and a non-light emitting region that is located on the outer periphery of the light emitting region and does not emit light. At least a portion of the optical adjustment member is provided to face the light emitting region.
  • the width in the predetermined direction within the surface of the optical adjustment member is shorter than the width in the predetermined direction of the light emitting region in at least one direction within the surface
  • the distance between the surface light-emitting panel and the diffusing member is longer than the width in a predetermined direction of the region not covered by the optical adjustment member in the light emitting region.
  • the surface light emitting unit further includes a second transmission member having a front surface and a back surface and provided between the optical adjustment member and the diffusion member.
  • the light emitting surface of the surface light emitting panel is in contact with the back surface of the first transmission member.
  • the surface of the first transmission member is in contact with one surface of the optical adjustment member.
  • the other surface of the optical adjustment member is in contact with the back surface of the second transmission member.
  • the surface of the second transmission member is in contact with one surface of the diffusion member.
  • a reflective member is provided on the non-light emitting area of the surface light emitting panel.
  • the luminance on the front side along the optical axis extending in the normal direction of the light emitting surface is set to 1.
  • the light distribution curve has at least a portion satisfying the condition of L> cos ⁇ .
  • the surface light emitting unit can make the non-light emitting region less noticeable than the conventional one while keeping the thickness thin.

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Abstract

Provided is a surface light emitting unit which is capable of making a non-light-emitting region less noticeable than conventional surface light emitting units, while maintaining a thin thickness. A surface light emitting unit (100) is provided with: a surface light emitting panel (20) having a light emitting surface which comprises a light emitting region (RA) that emits light and a non-light-emitting region (RB) that is positioned around the light emitting region (RA) and does not emit light; a transmissive member (21) which has a front surface (21A) and a back surface (21B) and is arranged such that the back surface (21B) faces the light emitting surface; an optical control member (22) which is arranged so as to face the front surface (21A) of the transmissive member (21) for the purpose of dimming the light from the front surface (21A) of the transmissive member (21); and a diffusion member (26) which is arranged so as to face a surface of the optical control member (22), said surface being on the reverse side of the transmissive member (21)-side surface of the optical control member (22). At least a part of the optical control member (22) is provided so as to face the light emitting region (RA). The width (LA) of the optical control member (22) in a predetermined in-plane direction is smaller than the width (LC) of the light emitting region (RA) in the above-mentioned predetermined direction at least in one in-plane direction.

Description

面発光ユニットSurface emitting unit
 本開示は、面発光パネルを備える面発光ユニットに関する。 This disclosure relates to a surface light emitting unit including a surface light emitting panel.
 近年、携帯電話やタブレット端末などが普及している。図15および図16に表面側と裏面側とがそれぞれ示されるように、一般的なタブレット端末50は、筺体51および複数の表示部52~55を備える。タブレット端末50の厚みTは、たとえば7mm以下である。図15に示される表面側について例説すると、表示部52,53以外の領域、すなわちタブレット端末50の枠(縁)の部分の幅W(図15参照)をできるだけ小さくしたいという要望があり、タブレット端末50に内蔵されるバックライトや照明は、筺体51の端部に近い部分まで発光可能であることが要求される。 In recent years, mobile phones and tablet terminals have become popular. As shown in FIGS. 15 and 16 on the front side and the back side, a general tablet terminal 50 includes a casing 51 and a plurality of display units 52 to 55. The thickness T of the tablet terminal 50 is, for example, 7 mm or less. The front side shown in FIG. 15 will be described as an example. There is a desire to reduce the width W (see FIG. 15) of the region other than the display units 52 and 53, that is, the frame (edge) portion of the tablet terminal 50 as much as possible. The backlight and illumination built in the terminal 50 are required to be able to emit light up to a portion near the end of the casing 51.
 携帯電話やタブレット端末などのバックライトとして、面発光パネルを用いることが検討されている。面発光パネルにおいては発光面の略全体が発光する。面発光パネルを備える面発光ユニットは、バックライトだけでなく、照明分野にも適用できる。面発光パネルの一例としては、有機ELが知られている。有機ELは、薄型の面発光パネルであり可撓性を有しているため、新しい光源として期待されている。 The use of surface-emitting panels as backlights for mobile phones and tablet terminals is being studied. In the surface emitting panel, substantially the entire light emitting surface emits light. A surface light-emitting unit including a surface light-emitting panel can be applied not only to a backlight but also to the lighting field. An organic EL is known as an example of a surface emitting panel. Organic EL is expected to be a new light source because it is a thin surface emitting panel and has flexibility.
 有機ELなどの面発光パネルにおいては、水分および酸素から発光部分(発光層または発光素子など)を保護するため、発光部分の周囲に封止を行なうのが一般的である。封止部は、発光部分を覆うように設けられるため、発光部分よりも広い面積を有している。このため、面発光パネルのうちの光を出射する面(発光面)には、光を実際に放射する発光領域だけでなく、光をほとんどまたは全く放射しない非発光領域が形成される。図15に示されるようなタブレット端末のバックライトにこの面発光パネルを用いたとき、光を放射しない領域は、表示部の照明に使用できず、図15の枠の部分(すなわち、幅W)に収容されることになるため、非発光領域の幅が大きいと幅Wが大きくならざるを得ず、相対的に表示部は小さくなってしまう。したがって、この非発光領域の幅をできるだけ小さくすることが求められる。また、タブレット端末などに対して薄型化が望まれており、非発光領域の幅を小さくする際には、タブレット端末の厚みが増さないことが重要である。 In a surface light emitting panel such as an organic EL, sealing is generally performed around the light emitting portion in order to protect the light emitting portion (such as a light emitting layer or a light emitting element) from moisture and oxygen. Since the sealing part is provided so as to cover the light emitting part, the sealing part has a larger area than the light emitting part. For this reason, not only a light emitting region that actually emits light but also a non-light emitting region that emits little or no light is formed on the surface of the surface light emitting panel that emits light (light emitting surface). When this surface emitting panel is used for the backlight of the tablet terminal as shown in FIG. 15, the area that does not emit light cannot be used for illumination of the display unit, and is the portion of the frame in FIG. 15 (ie, width W). Therefore, if the width of the non-light emitting region is large, the width W must be increased, and the display portion is relatively small. Therefore, it is required to make the width of the non-light emitting region as small as possible. In addition, it is desired to reduce the thickness of the tablet terminal and the like, and it is important that the thickness of the tablet terminal does not increase when the width of the non-light emitting area is reduced.
 特開2007-087900号公報(特許文献1)に開示されているバックライトシステムでは、平面型光源による発光面の周囲に斜面形状を有する側壁を配置し、当該発光面から所定の間隔を空けてバックライト発光面に光を導いている。これにより、当該バックライトシステムは、発光領域の面積を拡大する。特開2013-145723号公報(特許文献2)に開示されているLED(Light Emitting Diode)照明装置は、LED発光部の投光側に透光拡散板を離間して設けることでLEDの光を拡散し、眩しさを軽減している。特開2011-243448号公報(特許文献3)に開示されている有機EL素子は、光放射面を除いた部分に、鏡面金属膜からなる光反射層を有することで、本来利用されることのなかった光の有効効利用を図る。 In the backlight system disclosed in Japanese Patent Application Laid-Open No. 2007-087900 (Patent Document 1), a side wall having an inclined shape is arranged around the light emitting surface of the flat light source, and a predetermined interval is provided from the light emitting surface. Light is guided to the backlight surface. Thereby, the backlight system enlarges the area of the light emitting region. An LED (Light Emitting Diode) illumination device disclosed in Japanese Patent Application Laid-Open No. 2013-145723 (Patent Document 2) divides a light-transmitting diffusion plate on the light projecting side of an LED light-emitting unit to separate the light from the LED. It diffuses and reduces glare. The organic EL element disclosed in Japanese Patent Application Laid-Open No. 2011-243448 (Patent Document 3) has a light reflecting layer made of a specular metal film in a portion other than the light emitting surface, so that it can be used originally. The effective use of the light that did not exist.
特開2007-087900号公報JP 2007-087900 A 特開2013-145723号公報JP 2013-145723 A 特開2011-243448号公報JP 2011-243448 A
 特許文献1に開示されるバックライトシステムは、第1発光面から放射された光を側壁で反射させ第2発光面から取り出す必要がある。そのため、第1発光面と第2発光面との間に距離を設けなければならず、バックライトシステムの厚みが増してしまう。また、特許文献2に開示されるLED照明装置も同様に、透光拡散板を離間して設けなければならず、LED照明装置の厚みが増してしまう。 The backlight system disclosed in Patent Document 1 needs to reflect the light emitted from the first light emitting surface by the side wall and take it out from the second light emitting surface. For this reason, a distance must be provided between the first light emitting surface and the second light emitting surface, which increases the thickness of the backlight system. Similarly, the LED illumination device disclosed in Patent Document 2 must be provided with a light transmissive diffusion plate spaced apart, which increases the thickness of the LED illumination device.
 特許文献3に開示される有機EL素子は、発光領域と非発光領域との間の輝度差が大きくなり、一つの面発光パネルとして認識することが難しくなる。そのため、当該有機EL素子を見た人物は、非発光領域を認識してしまう。 The organic EL element disclosed in Patent Document 3 has a large luminance difference between the light emitting region and the non-light emitting region, and is difficult to recognize as one surface emitting panel. Therefore, a person who sees the organic EL element recognizes the non-light emitting area.
 本開示は上述のような問題点を解決するためになされたものであって、ある局面における目的は、厚みを薄く保ちつつ、非発光領域を従来よりも目立ちにくくすることが可能な面発光ユニットを提供することである。 The present disclosure has been made in order to solve the above-described problems, and an object in one aspect is to provide a surface light emitting unit capable of making a non-light emitting region less noticeable than the conventional one while keeping the thickness thin. Is to provide.
 一実施の形態に従うと、面発光ユニットは、発光面を有する面発光パネルと、表面および裏面を有し、かつ発光面と裏面とが対向するように設けられている第1透過部材と、第1透過部材の表面に対向するように設けられ、第1透過部材の表面からの光を減光するための光学調整部材と、光学調整部材の第1透過部材の側とは反対側の面に対向するように設けられている拡散部材とを備える。面発光パネルの発光面は、光を放射する発光領域と、発光領域の外周に位置し、光を放射しない非発光領域とを含む。光学調整部材の少なくとも一部分は、発光領域に対向するように設けられている。光学調整部材の面内の所定方向の幅は、当該面内の少なくとも一方向において、発光領域の所定方向の幅よりも短い。 According to one embodiment, the surface light emitting unit includes a surface light emitting panel having a light emitting surface, a first transmissive member having a front surface and a back surface, and provided so that the light emitting surface and the back surface face each other, An optical adjustment member for reducing light from the surface of the first transmission member; and an optical adjustment member on a surface opposite to the first transmission member side. And a diffusing member provided to face each other. The light emitting surface of the surface light emitting panel includes a light emitting region that emits light and a non-light emitting region that is located on the outer periphery of the light emitting region and does not emit light. At least a portion of the optical adjustment member is provided to face the light emitting region. The width in the predetermined direction within the surface of the optical adjustment member is shorter than the width in the predetermined direction of the light emitting region in at least one direction within the surface.
 上記の構成によれば、面発光ユニットは、厚みを薄く保ちつつ、非発光領域を従来よりも目立ちにくくすることができる。 According to the above configuration, the surface light emitting unit can make the non-light emitting region less noticeable than the conventional one while keeping the thickness thin.
実施の形態1に従う面発光ユニットを示す平面図であり、図2中の矢印I方向から見た面発光ユニットに相当している。It is a top view which shows the surface emitting unit according to Embodiment 1, and is equivalent to the surface emitting unit seen from the arrow I direction in FIG. 図1中のII-II線に沿った矢視断面図である。FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 面発光パネルの矢視断面図である。It is an arrow directional cross-sectional view of a surface emitting panel. 面発光パネルを示す平面図であり、図3中の矢印IV方向から見た面発光パネル20に相当している。It is a top view which shows a surface emitting panel, and is equivalent to the surface emitting panel 20 seen from the arrow IV direction in FIG. 面発光パネルおよび光学調整部材を示す平面図であり、図2中のI方向から見た面発光ユニットに相当する。It is a top view which shows a surface emitting panel and an optical adjustment member, and is equivalent to the surface emitting unit seen from the I direction in FIG. 変形例に従う面発光パネルおよび光学調整部材を示す平面図であり、図2中のI方向から見た面発光パネルおよび光学調整部材に相当する。It is a top view which shows the surface emitting panel and optical adjustment member according to a modification, and is equivalent to the surface emitting panel and optical adjustment member seen from the I direction in FIG. 実施の形態2に従う面発光ユニットの断面図を示す図であり、図1中のII-II線に沿った矢視断面図である。It is a figure which shows sectional drawing of the surface emitting unit according to Embodiment 2, and is arrow sectional drawing along the II-II line in FIG. 面発光パネルおよび反射部材を示す平面図であり、図7中のVIII方向から見た面発光パネルおよび反射部材に相当する。It is a top view which shows a surface emitting panel and a reflecting member, and is equivalent to the surface emitting panel and reflecting member seen from the VIII direction in FIG. 実施の形態3に従う面発光ユニットの配光曲線を垂直面内配光分布で示した図である。It is the figure which showed the light distribution curve of the surface emitting unit according to Embodiment 3 by the vertical in-plane light distribution. 比較例に従う面発光ユニットの断面図であり、図1中のII-II線に沿った矢視断面図である。It is sectional drawing of the surface emitting unit according to a comparative example, and is arrow sectional drawing along the II-II line in FIG. 比較例および実施例1~5に従う面発光ユニットの構成の違いを示した表である。6 is a table showing the difference in configuration of surface emitting units according to a comparative example and Examples 1 to 5. 実施例5における光学調整部材の開口率および開口幅を示したグラフである。10 is a graph showing an aperture ratio and an aperture width of an optical adjustment member in Example 5. 比較例に従う面発光ユニットと実施例1,2に従う面発光ユニットとの輝度プロファイルを示す図である。It is a figure which shows the luminance profile of the surface emitting unit according to a comparative example, and the surface emitting unit according to Example 1,2. 比較例に従う面発光ユニットと実施例3~5に従う面発光ユニットとの輝度プロファイルを示す図である。It is a figure which shows the luminance profile of the surface emitting unit according to a comparative example, and the surface emitting unit according to Examples 3-5. 一般的な構成を有するタブレット端末の表面側の構成を示す斜視図である。It is a perspective view which shows the structure of the surface side of the tablet terminal which has a general structure. 一般的な構成を有するタブレット端末の裏面側の構成を示す斜視図である。It is a perspective view which shows the structure of the back surface side of the tablet terminal which has a general structure.
 以下、図面を参照しつつ、本発明に従う各実施の形態について説明する。以下の説明では、同一の部品および構成要素には同一の符号を付してある。それらの名称および機能も同じである。したがって、これらについての詳細な説明は繰り返さない。また、以下で説明される各実施の形態および各実施例は、適宜選択的に組み合わされてもよい。 Embodiments according to the present invention will be described below with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated. Each embodiment and each example described below may be combined appropriately and appropriately.
 <実施の形態1>
  [面発光ユニット100]
 図1~図6を参照して、実施の形態1に従う面発光ユニット100について説明する。図1は、面発光ユニット100を示す平面図であり、図2中の矢印I方向から見た面発光ユニット100に相当している。図2は、図1中のII-II線に沿った矢視断面図である。図1および図2に示されるように、面発光ユニット100は、面発光パネル20と、透過部材21(第1透過部材)と、光学調整部材22と、透過部材24(第2透過部材)と、拡散部材26とを備える。以下、これらの構成について順に説明する。
<Embodiment 1>
[Surface emitting unit 100]
With reference to FIGS. 1 to 6, surface emitting unit 100 according to the first embodiment will be described. FIG. 1 is a plan view showing the surface light emitting unit 100, and corresponds to the surface light emitting unit 100 viewed from the direction of arrow I in FIG. 2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIGS. 1 and 2, the surface light emitting unit 100 includes a surface light emitting panel 20, a transmissive member 21 (first transmissive member), an optical adjustment member 22, and a transmissive member 24 (second transmissive member). And a diffusing member 26. Hereinafter, these configurations will be described in order.
  [面発光パネル20]
 図3は、面発光パネル20の矢視断面図である。図4は、面発光パネル20を示す平面図であり、図3中の矢印IV方向から見た面発光パネル20に相当している。図3および図4に示されるように、面発光パネル20は、陽極12、発光層13、陰極14、封止部材15および絶縁層16を含む。
[Surface emitting panel 20]
FIG. 3 is a cross-sectional view of the surface light emitting panel 20 as viewed from the direction of the arrow. FIG. 4 is a plan view showing the surface light emitting panel 20, and corresponds to the surface light emitting panel 20 viewed from the direction of arrow IV in FIG. As shown in FIGS. 3 and 4, the surface light emitting panel 20 includes an anode 12, a light emitting layer 13, a cathode 14, a sealing member 15, and an insulating layer 16.
 陽極12は、透明性を有する導電膜である。陽極12は、たとえば透過部材21(図2参照)上にITOが成膜されることで形成される。陽極12を形成するためのITO膜は、電極取出部17(陽極用)および電極取出部18(陰極用)を形成するために、パターニングによって2つの領域に分割されている。電極取出部18のITO膜は、陰極14と接続される。 The anode 12 is a conductive film having transparency. The anode 12 is formed, for example, by depositing ITO on the transmission member 21 (see FIG. 2). The ITO film for forming the anode 12 is divided into two regions by patterning in order to form the electrode extraction part 17 (for anode) and the electrode extraction part 18 (for cathode). The ITO film of the electrode extraction portion 18 is connected to the cathode 14.
 発光層13は、電力を供給されることによって光を生成する。発光層13は、単一または複数の層が積層されることによって構成される。陰極14は、たとえばアルミニウム(AL)であり、発光層13を覆うように形成される。絶縁層16は、陰極14と陽極12との間に設けられる。陰極14のうち、絶縁層16が位置している側とは反対側の部分は、電極取出部18に接続される。 The light emitting layer 13 generates light when supplied with electric power. The light emitting layer 13 is configured by laminating a single layer or a plurality of layers. The cathode 14 is made of aluminum (AL), for example, and is formed so as to cover the light emitting layer 13. The insulating layer 16 is provided between the cathode 14 and the anode 12. A portion of the cathode 14 opposite to the side where the insulating layer 16 is located is connected to the electrode extraction portion 18.
 封止部材15は、ガラス、薄膜ガラス、または樹脂フィルムなどから構成される。封止部材15は、陽極12、発光層13、および陰極14の全体を透過部材21(図2参照)上に封止する。電極取出部17,18は、電気的な接続のために、封止部材15から露出している。電極取出部17,18は、図示しない配線部材を通して外部電源に電気的に接続される。 The sealing member 15 is made of glass, thin film glass, resin film, or the like. The sealing member 15 seals the anode 12, the light emitting layer 13, and the cathode 14 on the transmission member 21 (see FIG. 2). The electrode extraction parts 17 and 18 are exposed from the sealing member 15 for electrical connection. The electrode extraction portions 17 and 18 are electrically connected to an external power source through a wiring member (not shown).
 なお、面発光パネル20は、いわゆるボトムエミッション型の有機EL素子であってもよいし、トップエミッション型の有機EL素子であってもよい。あるいは、面発光パネル20は、無機EL素子から構成されてもよいし、複数の発光ダイオード(LED)から構成さてもよい。また、面発光パネル20は、片面発光の素子であってもよいし、両面発光の素子であってもよい。 The surface emitting panel 20 may be a so-called bottom emission type organic EL element or a top emission type organic EL element. Or the surface emitting panel 20 may be comprised from an inorganic EL element, and may be comprised from several light emitting diode (LED). Moreover, the surface emitting panel 20 may be a single-sided light emitting device or a double-sided light emitting device.
  (面発光パネル20の発光領域RAおよび非発光領域RB)
 図1~図3を再び参照して、面発光パネル20の発光領域RAおよび非発光領域RBについて説明する。面発光パネル20においては、図示しない配線部材、電極取出部17,18、陽極12(透明電極)および陰極14を通して発光層13へ給電される。発光層13の中で光が生成され、光の一部はそのまま陽極12および透過部材21を通過して発光面20Sから取り出され、光の他の一部は陰極14で反射したのちに陽極12および透過部材21を通過して発光面20Sから取り出される。
(Light emitting area RA and non-light emitting area RB of the surface light emitting panel 20)
With reference to FIGS. 1 to 3 again, the light emitting area RA and the non-light emitting area RB of the surface light emitting panel 20 will be described. In the surface light emitting panel 20, power is supplied to the light emitting layer 13 through a wiring member (not shown), electrode extraction portions 17 and 18, the anode 12 (transparent electrode), and the cathode 14. Light is generated in the light emitting layer 13, and a part of the light passes through the anode 12 and the transmissive member 21 as it is, and is extracted from the light emitting surface 20 </ b> S, and the other part of the light is reflected by the cathode 14 and then the anode 12. Then, the light passes through the transmissive member 21 and is taken out from the light emitting surface 20S.
 面発光パネル20の発光面20Sは、発光領域RAと、非発光領域RBとを含む。図3の例では、発光領域RAは、発光層13上の領域であり、発光層13で生成された光は、発光領域RAから放射される(図3中の白色矢印参照)。非発光領域RBは、発光領域RAの外周に位置し、光をほとんどまたは全く放射しない。図3の例では、封止部材15および電極取出部17,18を面発光パネル20に設けたことによって、非発光領域RBが発光領域RAの周囲を囲うように形成されている。 The light emitting surface 20S of the surface light emitting panel 20 includes a light emitting area RA and a non-light emitting area RB. In the example of FIG. 3, the light emitting region RA is a region on the light emitting layer 13, and the light generated in the light emitting layer 13 is emitted from the light emitting region RA (see the white arrow in FIG. 3). The non-light emitting region RB is located on the outer periphery of the light emitting region RA and emits little or no light. In the example of FIG. 3, the non-light emitting region RB is formed so as to surround the light emitting region RA by providing the sealing member 15 and the electrode extraction portions 17 and 18 on the surface light emitting panel 20.
 図1に示されるように、発光領域RAおよび非発光領域RBは、面発光ユニット100の視認側から見ると、一点鎖線で示す境界線によって区画される。境界線は、点P1,P2,Q1,Q2を4つの頂点とする矩形状に形成されており、この境界線の内側に矩形状の発光領域RAが位置し、この境界線の外側に環状の非発光領域RBが位置している。図2に示されるように、面発光ユニット100を断面視した場合には、発光領域RAの幅LAは、たとえば3.5mmであり、非発光領域RBの幅LBは、たとえば2mm以上である。 As shown in FIG. 1, when viewed from the viewing side of the surface light emitting unit 100, the light emitting region RA and the non-light emitting region RB are partitioned by a boundary line indicated by a one-dot chain line. The boundary line is formed in a rectangular shape having points P1, P2, Q1, and Q2 as four vertices. A rectangular light-emitting region RA is located inside the boundary line, and an annular shape is formed outside the boundary line. The non-light emitting region RB is located. As shown in FIG. 2, when the surface light emitting unit 100 is viewed in cross section, the width LA of the light emitting region RA is, for example, 3.5 mm, and the width LB of the non-light emitting region RB is, for example, 2 mm or more.
  [透過部材21]
 図2を再び参照して、透過部材21について説明する。透過部材21は、表面21Aおよび裏面21Bを有する平板状の部材から構成される。透過部材21は、その裏面21Bが面発光パネル20の発光面20Sに対向するように設けられている。好ましくは、透過部材21の裏面21Bと面発光パネル20の表面20Aとは互いに接している。
[Transparent member 21]
With reference to FIG. 2 again, the transmissive member 21 will be described. The transmission member 21 is composed of a flat plate member having a front surface 21A and a back surface 21B. The transmissive member 21 is provided so that the back surface 21 </ b> B faces the light emitting surface 20 </ b> S of the surface light emitting panel 20. Preferably, the rear surface 21B of the transmissive member 21 and the front surface 20A of the surface light emitting panel 20 are in contact with each other.
 透過部材21としては、透過率が高く(たとえば、JIS K 7361-1:1997に準拠した方法で測定した可視光波長領域における全光線透過率が80%以上)、且つフレキシブル性に優れた材質が用いられることが好ましい。一例として、透過部材21は、PMMA(Polymethyl Methacrylate)などの透明樹脂フィルムで構成される。PMMAの厚みは、たとえば、0.2mmである。 As the transmissive member 21, a material having high transmittance (for example, a total light transmittance in a visible light wavelength region measured by a method based on JIS K 7361-1: 1997 is 80% or more) and excellent in flexibility is used. It is preferable to be used. As an example, the transmissive member 21 is made of a transparent resin film such as PMMA (Polymethyl Methacrylate). The thickness of PMMA is 0.2 mm, for example.
 発光領域RAから放射された光は、透過部材21の裏面21Bから内部に入射する。入射した光は、透過部材21の内部を透過して透過部材21の表面21Aからそのまま射出されたり、透過部材21と光学調整部材22との間の界面や、透過部材21と透過部材24との間の界面で反射して透過部材21の内部において面内方向に伝搬された後に、透過部材21の表面21Aから出射されたりする。 The light emitted from the light emitting area RA enters the inside from the back surface 21B of the transmissive member 21. The incident light passes through the inside of the transmissive member 21 and is emitted as it is from the surface 21A of the transmissive member 21, or the interface between the transmissive member 21 and the optical adjustment member 22, or between the transmissive member 21 and the transmissive member 24. After being reflected at the interface between them and propagating in the in-plane direction inside the transmissive member 21, the light is emitted from the surface 21 </ b> A of the transmissive member 21.
  [光学調整部材22]
 図2を再び参照して、光学調整部材22は、表面22Aおよび裏面22Bを有する。光学調整部材22は、透過部材21の表面21Aに対向するように設けられている。一例として、光学調整部材22は、透過部材21の表面21Aに白インクをインクジェット塗布することによって、透過部材21の表面21A上に設けられる。光学調整部材22の面方向(図2の紙面左右方向)の幅LCは、たとえば、3mmである。光学調整部材22の幅LCは、面発光パネル20の発光領域RAの幅LAよりも短い。
[Optical adjustment member 22]
Referring to FIG. 2 again, the optical adjustment member 22 has a front surface 22A and a back surface 22B. The optical adjustment member 22 is provided so as to face the surface 21 </ b> A of the transmission member 21. As an example, the optical adjustment member 22 is provided on the surface 21 </ b> A of the transmission member 21 by applying white ink by inkjet onto the surface 21 </ b> A of the transmission member 21. The width LC of the optical adjustment member 22 in the surface direction (left and right direction in FIG. 2) is, for example, 3 mm. The width LC of the optical adjustment member 22 is shorter than the width LA of the light emitting region RA of the surface light emitting panel 20.
 光学調整部材22は、透過部材21の表面21Aからの光を減光する機能を有する。より具体的には、光学調整部材22は、透過部材21の表面21Aから光学調整部材22の裏面22Bに到達した光の一部を透過したり、透過部材21の表面21Aから光学調整部材22の裏面22Bに到達した光の他の一部を反射したり、透過部材21の表面21Aから光学調整部材22の裏面22Bに到達した光の他の一部を吸収したりする。一例として、光学調整部材22の光の反射率は、47.5%である。光学調整部材22の光の透過率は、47.5%である。光学調整部材22の光の吸収率は、5.0%である。光学調整部材22で反射した光の一部は、再び透過部材21の内部において面内方向(図2の紙面左右方向)に伝搬する。 The optical adjustment member 22 has a function of dimming light from the surface 21A of the transmission member 21. More specifically, the optical adjustment member 22 transmits part of the light reaching the back surface 22B of the optical adjustment member 22 from the front surface 21A of the transmission member 21, or the optical adjustment member 22 of the optical adjustment member 22 from the front surface 21A of the transmission member 21. The other part of the light reaching the back surface 22B is reflected, or the other part of the light reaching the back surface 22B of the optical adjustment member 22 from the front surface 21A of the transmission member 21 is absorbed. As an example, the light reflectance of the optical adjustment member 22 is 47.5%. The light transmittance of the optical adjustment member 22 is 47.5%. The optical absorptivity of the optical adjustment member 22 is 5.0%. A part of the light reflected by the optical adjustment member 22 propagates again in the in-plane direction (the left-right direction in FIG. 2) inside the transmission member 21.
 光学調整部材22は、散乱材料を含む部材により構成されることが好ましい。ここでいう散乱材料の具体例としては、たとえば、酸化チタン、硫酸バリウム、硫酸マグネシウム、炭酸マグネシウム、炭酸カルシウム、シリカなどの無機微粒子が挙げられる。これらの他には、アクリル樹脂、有機シリコーン樹脂、ポリスチレン樹脂、尿素樹脂、ホルムアルデヒド縮合物、フッ素樹脂などの有機(架橋)微粒子も挙げられる。これらの他にも、島状に分散したポリメチルペンテン、ポリプロピレン、ポリエチレン、脂環式オレフィンなどに代表されるポリオレフィン系樹脂、ポリエチレンテレフタレート、ポリエチレン-2、6-ナフタレートなどに代表されるポリエステル系樹脂、ポリメチルメタクリレートなどに代表されるアクリル系樹脂、などからなる熱可塑性樹脂(各種共重合体を含む)も挙げられる。さらには、中空粒子または気泡などを挙げられる。粒子としては、1種類単独で用いてもよいし、2種類以上組み合わせて用いてもよい。 The optical adjustment member 22 is preferably composed of a member containing a scattering material. Specific examples of the scattering material here include inorganic fine particles such as titanium oxide, barium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, and silica. In addition to these, organic (crosslinked) fine particles such as acrylic resin, organic silicone resin, polystyrene resin, urea resin, formaldehyde condensate, and fluorine resin are also included. In addition to these, polyolefin resins represented by polymethylpentene, polypropylene, polyethylene, alicyclic olefins dispersed in islands, polyester resins represented by polyethylene terephthalate, polyethylene-2, 6-naphthalate, etc. There may also be mentioned thermoplastic resins (including various copolymers) composed of acrylic resins typified by polymethyl methacrylate and the like. Furthermore, hollow particles or bubbles may be mentioned. As the particles, one kind may be used alone, or two or more kinds may be used in combination.
 光学調整部材22は、透過部材21の表面21Aからの光を減光させる機能を有するものであれば、シート状の部材またはフィルム状の部材であってもよい。これらの部材は、透過部材21の表面21Aに透明性を有する光学系の接着剤などを用いて貼り付けられていてもよいし、透過部材21の表面21Aにわずかな間隔を空けて対向するように設けられていてもよい。間隔が設けられる場合には、光学調整部材22の裏面22Bは、透過部材21の表面21Aに対して平行であることが好ましい。 The optical adjustment member 22 may be a sheet-like member or a film-like member as long as it has a function of reducing light from the surface 21A of the transmission member 21. These members may be attached to the surface 21A of the transmissive member 21 using a transparent optical adhesive or the like, or face the surface 21A of the transmissive member 21 with a slight gap. May be provided. When the interval is provided, the back surface 22 </ b> B of the optical adjustment member 22 is preferably parallel to the surface 21 </ b> A of the transmission member 21.
  [光学調整部材22と発光領域RAとの位置関係]
 図5を参照して、面発光パネル20の発光領域RAと光学調整部材22との位置関係について説明する。図5は、面発光パネル20および光学調整部材22を示す平面図であり、図2中のI方向から見た面発光ユニット100に相当する。説明を分かりやすくするために、図5では、面発光パネル20および光学調整部材22以外の面発光ユニット100の構成については省略している。
[Positional relationship between optical adjustment member 22 and light emitting area RA]
With reference to FIG. 5, the positional relationship between the light emitting region RA of the surface light emitting panel 20 and the optical adjustment member 22 will be described. FIG. 5 is a plan view showing the surface light emitting panel 20 and the optical adjustment member 22 and corresponds to the surface light emitting unit 100 viewed from the I direction in FIG. In order to make the explanation easy to understand, the configuration of the surface light emitting unit 100 other than the surface light emitting panel 20 and the optical adjustment member 22 is omitted in FIG.
 光学調整部材22の少なくとも一部分は、面発光パネル20の発光領域RAに対向するように設けられている。異なる言い方をすれば、光学調整部材22は、発光領域RAの少なくとも一部分とは重ならないように設けられる。好ましくは、図5に示されるように、光学調整部材22のサイズは、発光領域RAのサイズよりも小さく、光学調整部材22は、発光領域RAの面内に設けられる。また、光学調整部材22の面内の所定方向の幅(たとえば、幅X1,Y1)は、当該面内の少なくとも一方向において、発光領域RAの当該所定方向の幅(たとえば、幅X2,Y2)よりも短い。ここでいう「光学調整部材22の面内の所定方向の幅」とは、光学調整部材22の辺の長さに相当する幅X1や幅Y1だけでなく、光学調整部材22の面内の斜め方向に相当する幅も含む。 At least a part of the optical adjustment member 22 is provided to face the light emitting area RA of the surface light emitting panel 20. In other words, the optical adjustment member 22 is provided so as not to overlap at least a part of the light emitting region RA. Preferably, as shown in FIG. 5, the size of the optical adjustment member 22 is smaller than the size of the light emitting region RA, and the optical adjustment member 22 is provided in the plane of the light emitting region RA. In addition, the width in the predetermined direction (for example, width X1, Y1) in the plane of the optical adjustment member 22 is the width in the predetermined direction (for example, width X2, Y2) of the light emitting region RA in at least one direction in the plane. Shorter than. The “width in a predetermined direction within the surface of the optical adjustment member 22” here refers not only to the width X1 and the width Y1 corresponding to the length of the side of the optical adjustment member 22, but also to the oblique angle within the surface of the optical adjustment member 22. Including the width corresponding to the direction.
 このように面発光パネル20および光学調整部材22が配置されることで、光学調整部材22が覆われている発光領域RA内の中央部分では光が減光される。一方で、光学調整部材22が覆われていない発光領域RA内の外周部分では光が減光されない。これにより、面発光ユニット100は、発光領域RAの周辺に位置する非発光領域RBを明るく見せることができる。その結果、面発光ユニット100は、発光領域RAと非発光領域RBとの間の輝度差を小さくすることができ、非発光領域RBがあたかも発光領域RAと同じように光っているように見せることができる。そのため、非発光領域RBが目立ちにくくなる。 As described above, the surface light emitting panel 20 and the optical adjustment member 22 are arranged, so that light is reduced in the central portion in the light emitting area RA where the optical adjustment member 22 is covered. On the other hand, light is not dimmed at the outer peripheral portion in the light emitting area RA where the optical adjustment member 22 is not covered. Thereby, the surface emitting unit 100 can make the non-light emitting region RB located around the light emitting region RA appear bright. As a result, the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB, and the non-light emitting area RB looks as if it is shining in the same way as the light emitting area RA. Can do. For this reason, the non-light emitting region RB is less noticeable.
 また、光学調整部材22は、上述したように、透過部材21の表面21Aに白インクをインクジェット塗布することによって設けられるため、光学調整部材22が面発光ユニット100に設けられたとしても、面発光ユニット100の厚みは、ほとんど増加しない。 Further, as described above, since the optical adjustment member 22 is provided by applying white ink to the surface 21A of the transmission member 21 by ink jetting, even if the optical adjustment member 22 is provided in the surface light emitting unit 100, surface light emission. The thickness of the unit 100 hardly increases.
  (光学調整部材22と発光領域RAとの位置関係に関する変形例)
 面発光パネル20および光学調整部材22の関係は、図5に示される例に限定されない。以下では、図6を参照して、面発光パネル20および光学調整部材22の変形例について説明する。図6は、変形例に従う面発光パネル20および光学調整部材22を示す平面図であり、図2中のI方向から見た面発光パネル20および光学調整部材22に相当する。説明を分かりやすくするために、図6では、面発光パネル20および光学調整部材22以外の面発光ユニット100の構成については省略している。
(Modification regarding the positional relationship between the optical adjustment member 22 and the light emitting region RA)
The relationship between the surface light emitting panel 20 and the optical adjustment member 22 is not limited to the example shown in FIG. Below, with reference to FIG. 6, the modification of the surface emitting panel 20 and the optical adjustment member 22 is demonstrated. FIG. 6 is a plan view showing the surface light-emitting panel 20 and the optical adjustment member 22 according to the modification, and corresponds to the surface light-emitting panel 20 and the optical adjustment member 22 viewed from the I direction in FIG. In order to make the explanation easy to understand, the configuration of the surface light emitting unit 100 other than the surface light emitting panel 20 and the optical adjustment member 22 is omitted in FIG. 6.
 光学調整部材22の面内の所定方向の幅が少なくとも一方向において発光領域RAの幅よりも短く、光学調整部材22の少なくとも一部分が面発光パネル20の発光領域RAに対向するように設けられてさえいれば、発光領域RAと光学調整部材22との位置関係やサイズは、特に限定されない。たとえば、図6に示されるように、光学調整部材22の幅Y1が発光領域RAの幅Y2よりも短ければ、光学調整部材22の幅X1は、発光領域RAの幅X2よりも長くてもよい。 The width of the optical adjustment member 22 in a predetermined direction is shorter than the width of the light emitting region RA in at least one direction, and at least a part of the optical adjustment member 22 is provided to face the light emitting region RA of the surface light emitting panel 20. As long as it is present, the positional relationship and size between the light emitting region RA and the optical adjustment member 22 are not particularly limited. For example, as shown in FIG. 6, if the width Y1 of the optical adjustment member 22 is shorter than the width Y2 of the light emitting region RA, the width X1 of the optical adjustment member 22 may be longer than the width X2 of the light emitting region RA. .
 光学調整部材22が発光領域RAに対して図6のように配置されることで、面発光ユニット100は、図6の紙面上下方向において発光領域RAと非発光領域RBとの間の輝度差を小さくすることができる。その結果、面発光ユニット100は、図6の紙面上下方向において非発光領域RBがあたかも発光領域RAと同じように光っているように見せることができる。 By arranging the optical adjustment member 22 with respect to the light emitting area RA as shown in FIG. 6, the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB in the vertical direction of the paper in FIG. 6. Can be small. As a result, the surface light emitting unit 100 can appear as if the non-light emitting region RB is shining in the same manner as the light emitting region RA in the vertical direction of the drawing in FIG.
  [透過部材24]
 図2を再び参照して、透過部材24について説明する。透過部材24は、表面24Aおよび裏面24Bを有する平板状の部材から構成される。透過部材24は、その裏面24Bが光学調整部材22の表面22Aに対向するように設けられている。
[Transparent member 24]
With reference to FIG. 2 again, the transmissive member 24 will be described. The transmission member 24 is composed of a flat plate member having a front surface 24A and a back surface 24B. The transmissive member 24 is provided such that the back surface 24 </ b> B faces the front surface 22 </ b> A of the optical adjustment member 22.
 透過部材24としては、透過率が高く(たとえば、JIS K 7361-1:1997に準拠した方法で測定した可視光波長領域における全光線透過率が80%以上)、且つフレキシブル性に優れた材質が用いられることが好ましい。一例として、透過部材24は、PMMAなどの透明樹脂フィルムで構成される。PMMAの厚みは、たとえば、0.22mmである。 The transmissive member 24 is made of a material having a high transmittance (for example, a total light transmittance of 80% or more in a visible light wavelength region measured by a method according to JIS K 7361-1: 1997) and excellent flexibility. It is preferable to be used. As an example, the transmissive member 24 is made of a transparent resin film such as PMMA. The thickness of PMMA is 0.22 mm, for example.
 光学調整部材22の表面22Aからの光は、透過部材24の裏面24Bから内部に入射する。入射した光は、透過部材24の内部を透過して透過部材24の表面24Aからそのまま射出されたり、透過部材24と拡散部材26との間の界面で反射して透過部材24の内部において面内方向(図2の紙面左右方向)に伝搬された後に、透過部材24の表面24Aから出射されたりする。 The light from the front surface 22A of the optical adjustment member 22 enters the inside from the back surface 24B of the transmission member 24. The incident light passes through the inside of the transmissive member 24 and is emitted as it is from the surface 24 A of the transmissive member 24, or is reflected at the interface between the transmissive member 24 and the diffusing member 26 and is in-plane within the transmissive member 24. After being transmitted in the direction (left and right direction in FIG. 2), the light is emitted from the surface 24A of the transmission member 24.
  [拡散部材26]
 図2を再び参照して、拡散部材26について説明する。拡散部材26は、表面26Aおよび裏面26Bを有する平板状の部材から構成される。拡散部材26は、光学調整部材22の透過部材21の側とは反対側の面(表面22A)に対向するように設けられている。
[Diffusion member 26]
Referring to FIG. 2 again, the diffusion member 26 will be described. The diffusing member 26 is configured by a flat member having a front surface 26A and a back surface 26B. The diffusing member 26 is provided so as to face the surface (surface 22A) opposite to the transmitting member 21 side of the optical adjusting member 22.
 ある局面において、図2に示されるように、拡散部材26は、光学調整部材22の表面22Aから間隔を空けて設けられ、透過部材21と拡散部材26との間には透過部材24が設けられる。この場合、拡散部材26は、その裏面26Bが透過部材24の表面24Aに接するように設けられる。 In one aspect, as shown in FIG. 2, the diffusing member 26 is provided at a distance from the surface 22 </ b> A of the optical adjustment member 22, and the transmissive member 24 is provided between the transmissive member 21 and the diffusing member 26. . In this case, the diffusion member 26 is provided so that the back surface 26 </ b> B is in contact with the front surface 24 </ b> A of the transmission member 24.
 他の局面において、拡散部材26は、その裏面26Bが光学調整部材22の表面22Aに接するように設けられる。すなわち、この場合、光学調整部材22と拡散部材26との間には透過部材24が設けられない。 In another aspect, the diffusing member 26 is provided such that its back surface 26B is in contact with the surface 22A of the optical adjusting member 22. That is, in this case, the transmission member 24 is not provided between the optical adjustment member 22 and the diffusion member 26.
 拡散部材26は、透過部材24の表面24Aから出射され拡散部材26に到達した光を拡散させる機能を有する。拡散部材26は、たとえば、シート状の部材またはフィルム状の部材から構成される。より具体的には、拡散部材26としては、アクリルやポリカーボネートといった樹脂部材の表面に微小な凹凸加工を施したもの(すなわち界面反射作用を利用するもの)や、母材の中に酸化チタンに代表される白色散乱粒子を含む散乱材料を均一に分散させたもの(すなわち内部散乱作用を利用するもの)などを用いることができる。拡散部材26は、たとえば、90%のHaze値を有する。 The diffusing member 26 has a function of diffusing light emitted from the surface 24A of the transmitting member 24 and reaching the diffusing member 26. The diffusing member 26 is composed of, for example, a sheet-like member or a film-like member. More specifically, as the diffusing member 26, the surface of a resin member such as acrylic or polycarbonate is subjected to minute unevenness processing (that is, one using an interface reflection action), or the base material is represented by titanium oxide. A material in which a scattering material containing white scattering particles is uniformly dispersed (that is, a material using an internal scattering effect) or the like can be used. The diffusion member 26 has a Haze value of 90%, for example.
 拡散部材26は、面発光パネル20の表面20Aから距離H(図2参照)を空けて設けられる。これにより、面発光パネル20の発光領域RA内において光学調整部材22に覆われていない領域(以下、「非減光領域」ともいう。)から放射された光は、拡散部材26に到達するまでに広がる。そのため、面発光ユニット100は、非発光領域RBが光っているように見せることができる。 The diffusion member 26 is provided at a distance H (see FIG. 2) from the surface 20A of the surface light emitting panel 20. As a result, light emitted from a region not covered by the optical adjustment member 22 in the light emitting region RA of the surface light emitting panel 20 (hereinafter also referred to as “non-dimming region”) until reaching the diffusion member 26. To spread. Therefore, the surface emitting unit 100 can appear as if the non-light emitting region RB is shining.
 好ましくは、面発光パネル20と拡散部材26との間の距離Hは、非減光領域の幅W2(図2参照)よりも長い。これにより、面発光ユニット100は、光学調整部材22によって減光される領域と減光されない領域との間の輝度差を小さくすることができ、面発光ユニット100を見た人物は、これらの領域を一つの光源として認識できる。 Preferably, the distance H between the surface light emitting panel 20 and the diffusing member 26 is longer than the width W2 of the non-dimming region (see FIG. 2). Accordingly, the surface light emitting unit 100 can reduce the luminance difference between the area that is dimmed by the optical adjustment member 22 and the area that is not dimmed. Can be recognized as one light source.
  [小括]
 以上のように構成される面発光ユニット100によれば、光学調整部材22の少なくとも一部分は、面発光パネル20の発光領域RAに対向するように設けられる。また、光学調整部材22の面内の所定方向の幅は、当該面内の少なくとも一方向において、発光領域RAの当該所定方向の幅よりも短い。これにより、光学調整部材22が覆われている発光領域RA内の中央部分では光が減光され、光学調整部材22が覆われていない発光領域RA内の外周部分では光が減光されない。その結果、面発光ユニット100は、発光領域RAと非発光領域RBとの間の輝度差を小さくすることができ、非発光領域RBがあたかも発光領域RAと同じように光っているように見せることができる。そのため、非発光領域RBが目立ちにくくなる。
[Brief Summary]
According to the surface light emitting unit 100 configured as described above, at least a part of the optical adjustment member 22 is provided so as to face the light emitting region RA of the surface light emitting panel 20. Further, the width in the predetermined direction in the plane of the optical adjustment member 22 is shorter than the width in the predetermined direction of the light emitting region RA in at least one direction in the plane. Thereby, light is attenuated in the central portion in the light emitting region RA where the optical adjustment member 22 is covered, and light is not attenuated in the outer peripheral portion in the light emitting region RA where the optical adjustment member 22 is not covered. As a result, the surface light emitting unit 100 can reduce the luminance difference between the light emitting area RA and the non-light emitting area RB, and the non-light emitting area RB looks as if it is shining in the same way as the light emitting area RA. Can do. For this reason, the non-light emitting region RB is less noticeable.
 また、図2に示されるように、面発光パネル20、透過部材21、光学調整部材22、透過部材24、および拡散部材26の各々は、その界面が互いに接するように設けられる。より具体的には、面発光パネル20の発光面20Sは、透過部材21の裏面21Bと接する。透過部材21の表面21Aは、光学調整部材22の一方の面(裏面22B)と接する。光学調整部材22の他方の面(表面22A)は、透過部材24の裏面24Bと接する。透過部材24の表面24Aは、拡散部材26の一方の面(裏面26B)と接する。 Further, as shown in FIG. 2, each of the surface light emitting panel 20, the transmissive member 21, the optical adjusting member 22, the transmissive member 24, and the diffusing member 26 is provided such that the interfaces thereof are in contact with each other. More specifically, the light emitting surface 20 </ b> S of the surface light emitting panel 20 is in contact with the back surface 21 </ b> B of the transmissive member 21. The front surface 21 </ b> A of the transmissive member 21 is in contact with one surface (back surface 22 </ b> B) of the optical adjustment member 22. The other surface (front surface 22A) of the optical adjustment member 22 is in contact with the back surface 24B of the transmission member 24. The front surface 24 </ b> A of the transmission member 24 is in contact with one surface (back surface 26 </ b> B) of the diffusion member 26.
 このように構成されることで、各界面での光の損失が軽減され、面発光ユニット100は、視認側へ放射する光の割合を増加させることができる。また、面発光パネル20の発光領域RAから放射された光は、非発光領域RB上の領域では、発光領域RA上の領域よりも斜めになること多い。面発光ユニット100の各構成が接するように設けられることで、面発光ユニット100は、非発光領域RB上の領域において、各構成の界面と空気との間で生じる全反射やフレネル損失を抑えることができる。その結果、面発光ユニット100は、非発光領域RBに対応する領域の輝度を上げることができる。 With such a configuration, the loss of light at each interface is reduced, and the surface emitting unit 100 can increase the proportion of light emitted to the viewing side. Further, the light emitted from the light emitting area RA of the surface light emitting panel 20 is often inclined in the area on the non-light emitting area RB than the area on the light emitting area RA. By providing each component of the surface light emitting unit 100 in contact with each other, the surface light emitting unit 100 suppresses total reflection and Fresnel loss that occur between the interface of each component and air in the region on the non-light emitting region RB. Can do. As a result, the surface light emitting unit 100 can increase the luminance of the region corresponding to the non-light emitting region RB.
 <実施の形態2>
  [反射部材30]
 図7および図8を参照して、実施の形態2に従う面発光ユニット100Aについて説明する。図7は、面発光ユニット100Aの断面図を示す図であり、図1中のII-II線に沿った矢視断面図である。図8は、面発光パネル20および反射部材30を示す平面図であり、図7中のVIII方向から見た面発光パネル20および反射部材30に相当する。説明を分かりやすくするために、図8では、面発光パネル20および反射部材30以外の面発光ユニット100Aの構成については省略している。
<Embodiment 2>
[Reflection member 30]
With reference to FIG. 7 and FIG. 8, surface emitting unit 100A according to the second embodiment will be described. FIG. 7 is a cross-sectional view of the surface emitting unit 100A, and is a cross-sectional view taken along the line II-II in FIG. FIG. 8 is a plan view showing the surface light emitting panel 20 and the reflecting member 30 and corresponds to the surface light emitting panel 20 and the reflecting member 30 as viewed from the VIII direction in FIG. For ease of explanation, the configuration of the surface light emitting unit 100A other than the surface light emitting panel 20 and the reflecting member 30 is omitted in FIG.
 面発光ユニット100Aは、上述の実施の形態1に従う面発光ユニット100の構成に加えて、反射部材30をさらに備えている。反射部材30は、面発光パネル20の発光領域RAの周囲に位置する非発光領域RB上に設けられている。反射部材30は、非発光領域RBの全部に形成されていてもよいし、非発光領域RBの一部に形成されていてもよい。反射部材30は、光の反射機能または散乱機能を有する。反射部材30には、たとえば、鏡面反射部材が用いられる。反射部材30に用いられる材料としては、PET(ポリエチレンテレフタラート)などの高分子材料、Al、Agなどの金属などが挙げられる。 The surface light emitting unit 100A further includes a reflecting member 30 in addition to the configuration of the surface light emitting unit 100 according to the first embodiment. The reflection member 30 is provided on the non-light emitting region RB located around the light emitting region RA of the surface light emitting panel 20. The reflection member 30 may be formed on the entire non-light emitting region RB, or may be formed on a part of the non-light emitting region RB. The reflecting member 30 has a light reflecting function or a scattering function. As the reflecting member 30, for example, a specular reflecting member is used. Examples of the material used for the reflecting member 30 include polymer materials such as PET (polyethylene terephthalate), metals such as Al and Ag.
 反射部材30が有する散乱機能の付与の方法としては、透過部材21の裏面21Bの一部を予め荒らしておく方法や、反射部材30の表面を粗面化する方法、および樹脂バインダーに散乱用の粒子を混ぜた散乱層を平滑な反射金属膜の上に設ける方法などがある。反射部材30は、散乱粒子を分散した有機溶剤系の白インクから構成されていてもよい。この場合には、反射部材30による散乱反射面は、たとえば、透過部材21の裏面21Bに白インクをインクジェット塗布することで形成することが可能である。 As a method for imparting the scattering function of the reflecting member 30, a method for roughening a part of the back surface 21B of the transmitting member 21, a method for roughening the surface of the reflecting member 30, and a resin binder for scattering. There is a method of providing a scattering layer mixed with particles on a smooth reflective metal film. The reflecting member 30 may be made of an organic solvent-based white ink in which scattering particles are dispersed. In this case, the scattering reflection surface by the reflection member 30 can be formed by, for example, applying white ink to the back surface 21B of the transmission member 21 by inkjet.
  [小括]
 反射部材30は、透過部材21と光学調整部材22との間の界面や、透過部材21と透過部材24との間の界面で反射した光を面発光ユニット100Aの視認側に向けて反射する。これにより、面発光ユニット100Aは、非発光領域RB上の領域からより多くの光を放射できる。その結果、面発光ユニット100Aは、非発光領域RBの輝度を上げることができる。
[Brief Summary]
The reflection member 30 reflects the light reflected at the interface between the transmission member 21 and the optical adjustment member 22 or the interface between the transmission member 21 and the transmission member 24 toward the viewing side of the surface emitting unit 100A. Thereby, the surface emitting unit 100A can radiate more light from the region on the non-light emitting region RB. As a result, the surface light emitting unit 100A can increase the luminance of the non-light emitting region RB.
 <実施の形態3>
  [配光曲線]
 図9を参照して、実施の形態3に従う面発光ユニット100Bについて説明する。図9は、面発光ユニット100Bに用いられている面発光パネル20の配光曲線を垂直面内配光分布で示した図である。実施の形態3に従う面発光ユニット100Bでは、面発光パネル20の非発光領域RBにより多くの光を集めるために斜め方向に放射する光をより多くする。面発光ユニット100Bの構成については、実施の形態1に従う面発光ユニット100と同じであるので、それらについては説明を繰り返さない。
<Embodiment 3>
[Light distribution curve]
With reference to FIG. 9, surface emitting unit 100B according to the third embodiment will be described. FIG. 9 is a diagram showing a light distribution curve of the surface light emitting panel 20 used in the surface light emitting unit 100B as a vertical in-plane light distribution. In surface emitting unit 100B according to the third embodiment, more light is emitted in an oblique direction in order to collect more light in non-light emitting region RB of surface emitting panel 20. Since the configuration of surface emitting unit 100B is the same as that of surface emitting unit 100 according to the first embodiment, description thereof will not be repeated.
 面発光ユニット100Bは、面発光パネル20から放射される光の発光面20S(図3参照)と垂直な平面における配光曲線を描いた場合に、発光面20Sの法線方向(すなわち、図3の白色矢印方向)に延在する光軸に沿った正面側の輝度(すなわち、図中に示すθ=0°における輝度)を1とし、当該平面内において上記光軸との間で形成される角がθである方向の輝度(すなわち、-90°<θ<90°であってθ≠0°の範囲における輝度)をLとすると、当該配光曲線が、L>cosθの条件を満たす部分を少なくとも有している。 When the surface light emitting unit 100B draws a light distribution curve in a plane perpendicular to the light emitting surface 20S (see FIG. 3) of the light emitted from the surface light emitting panel 20, the normal direction of the light emitting surface 20S (that is, FIG. 3). The luminance on the front side along the optical axis extending in the direction of the white arrow (that is, the luminance at θ = 0 ° shown in the figure) is 1, and is formed between the optical axis in the plane. When the luminance in the direction where the angle is θ (that is, the luminance in the range of −90 ° <θ <90 ° and θ ≠ 0 °) is L, the light distribution curve satisfies the condition of L> cos θ. At least.
 すなわち、図9の「ランバート配光」として示される配光曲線31が、L=cosθを描いたものであるので、少なくとも一部分で配光曲線31よりも輝度が大きい場合に、L>cosθの条件が満たされる。たとえば、図9の「斜め配光」として示される配光曲線32が、L>cosθの条件を満たす。配光曲線32は、概ね、-80°≦θ≦-60°および60°≦θ≦80°でL>cosθの条件を満たしている。 That is, since the light distribution curve 31 shown as “Lambert light distribution” in FIG. 9 depicts L = cos θ, the condition of L> cos θ when the luminance is higher than the light distribution curve 31 at least in part. Is satisfied. For example, the light distribution curve 32 shown as “oblique light distribution” in FIG. 9 satisfies the condition of L> cos θ. The light distribution curve 32 generally satisfies the condition of L> cos θ at −80 ° ≦ θ ≦ −60 ° and 60 ° ≦ θ ≦ 80 °.
  [小括]
 以上のようにして、面発光ユニット100Bは、L>cosθの条件を満たすように配光する。その結果、面発光ユニット100Bは、より多くの光を非発光領域RB上の領域に導くことができ、発光領域RAと非発光領域RBとの間の輝度差を小さくすることができる。これにより、面発光ユニット100Bは、非発光領域RBがあたかも発光領域RAと同じように光っているように見せることができ、非発光領域RBが目立たなくなる。
[Brief Summary]
As described above, the surface emitting unit 100B distributes light so as to satisfy the condition of L> cos θ. As a result, the surface light emitting unit 100B can guide more light to the region on the non-light emitting region RB, and can reduce the luminance difference between the light emitting region RA and the non-light emitting region RB. Thereby, the surface light emitting unit 100B can make the non-light-emitting area RB appear to shine like the light-emitting area RA, and the non-light-emitting area RB becomes inconspicuous.
 <シミュレーション>
 図10~図13を参照して、上述の実施の形態に関して行なったシミュレーションについて説明する。当該シミュレーションは、上述の実施の形態に基づく実施例1~5と、上述の実施の形態に基づかない比較例とを比較したものである。実施例1~5と比較例との相違点は、主として、実施例1~5では光学調整部材22が設けられ、比較例では光学調整部材22が設けられていない点である。以下では、比較例の構成と実施例1~5の構成を順に説明し、その後に、比較例および実施例1~5のシミュレーション結果について説明する。
<Simulation>
With reference to FIGS. 10 to 13, a simulation performed on the above-described embodiment will be described. The simulation is a comparison between Examples 1 to 5 based on the above-described embodiment and a comparative example not based on the above-described embodiment. The difference between the first to fifth embodiments and the comparative example is mainly that the optical adjusting member 22 is provided in the first to fifth embodiments, and the optical adjusting member 22 is not provided in the comparative example. Hereinafter, the configuration of the comparative example and the configurations of Examples 1 to 5 will be described in order, and then the simulation results of the comparative example and Examples 1 to 5 will be described.
  (比較例の構成)
 図10および図11を参照して、比較例に従う面発光ユニット200の構成について説明する。図10は、面発光ユニット200の断面図であり、図1中のII-II線に沿った矢視断面図である。図11は、比較例および実施例1~5に従う面発光ユニットの構成の違いを示した表である。
(Configuration of comparative example)
With reference to FIG. 10 and FIG. 11, the structure of the surface emitting unit 200 according to a comparative example is demonstrated. 10 is a cross-sectional view of the surface light emitting unit 200, and is a cross-sectional view taken along the line II-II in FIG. FIG. 11 is a table showing the difference in configuration of the surface emitting units according to the comparative example and Examples 1 to 5.
 図10に示されるように、面発光ユニット200は、発光領域RAと非発光領域RBとを有する面発光パネル20と、透過部材21と、拡散部材26とを備える。なお、図10および図11に示されるように、面発光ユニット200には、光学調整部材22が設けられていない。 As shown in FIG. 10, the surface light emitting unit 200 includes a surface light emitting panel 20 having a light emitting area RA and a non-light emitting area RB, a transmissive member 21, and a diffusing member 26. As shown in FIGS. 10 and 11, the surface emitting unit 200 is not provided with the optical adjustment member 22.
 面発光パネル20の発光領域RAの幅LAは、3.5mmである。面発光パネル20の非発光領域RBは、発光領域RAの周辺に位置し、非発光領域RBの幅LBは、2mm以上である。透過部材21は、PMMAで構成されている。透過部材21の厚みは、0.42mmである。拡散部材26は、光の透過率が50%である白色散乱シートで構成されている。拡散部材26のHaze値は、90%である。発光領域RAからの配光は、ランバート配光である。発光領域RAの裏面は70%の反射率を有する反射電極となっており、非発光領域RBの裏面は反射率60%の金属反射面となっている。 The width LA of the light emitting area RA of the surface light emitting panel 20 is 3.5 mm. The non-light emitting area RB of the surface light emitting panel 20 is located around the light emitting area RA, and the width LB of the non-light emitting area RB is 2 mm or more. The transmission member 21 is made of PMMA. The thickness of the transmissive member 21 is 0.42 mm. The diffusing member 26 is composed of a white scattering sheet having a light transmittance of 50%. The Haze value of the diffusing member 26 is 90%. Light distribution from the light emitting area RA is Lambert light distribution. The back surface of the light emitting region RA is a reflective electrode having a reflectance of 70%, and the back surface of the non-light emitting region RB is a metal reflecting surface having a reflectance of 60%.
  (実施例1~5の共通の構成)
 図2を再び参照して、実施例1~5に従う面発光ユニットに共通する構成について説明する。当該面発光ユニットは、実施の形態1に従う面発光ユニット100と同様に、面発光パネル20と、透過部材21と、光学調整部材22と、透過部材24と、拡散部材26とを備える。
(Common configuration of Examples 1 to 5)
With reference to FIG. 2 again, a configuration common to the surface emitting units according to the first to fifth embodiments will be described. Similar to the surface light emitting unit 100 according to the first embodiment, the surface light emitting unit includes a surface light emitting panel 20, a transmission member 21, an optical adjustment member 22, a transmission member 24, and a diffusion member 26.
 面発光パネル20は、発光領域RAと、非発光領域RBとを有する。発光領域RAの幅LAは、3.5mmである。非発光領域RBは、発光領域RAの周辺に位置し、非発光領域RBの幅LBは、2mm以上である。発光領域RAの裏面は、反射率70%を有する反射電極で構成されている。非発光領域RBの裏面は、反射率60%の金属反射面で構成されている。 The surface light emitting panel 20 has a light emitting area RA and a non-light emitting area RB. The width LA of the light emitting area RA is 3.5 mm. The non-light emitting region RB is located around the light emitting region RA, and the width LB of the non-light emitting region RB is 2 mm or more. The back surface of the light emitting area RA is composed of a reflective electrode having a reflectance of 70%. The back surface of the non-light emitting region RB is composed of a metal reflecting surface with a reflectance of 60%.
 透過部材21は、PMMAで構成されている。透過部材21の厚みは、0.2mmである。光学調整部材22は、透過率50%の白色散乱シートで構成されている。光学調整部材22のHaze値は、99%である。透過部材24は、PMMAで構成されている。透過部材21の厚みは、0.22mmである。透過部材21、光学調整部材22、透過部材24の各々の界面は、互いに接している。 The transmission member 21 is made of PMMA. The thickness of the transmissive member 21 is 0.2 mm. The optical adjustment member 22 is composed of a white scattering sheet having a transmittance of 50%. The haze value of the optical adjustment member 22 is 99%. The transmission member 24 is made of PMMA. The thickness of the transmissive member 21 is 0.22 mm. The interfaces of the transmission member 21, the optical adjustment member 22, and the transmission member 24 are in contact with each other.
  (実施例1の構成)
 図11を再び参照して、実施例1に従う面発光ユニットの特有の構成について説明する。図11に示されるように、実施例1では、面発光パネル20の配光は、ランバート配光(図9参照)である。光学調整部材22の反射率は、47.5%である。光学調整部材22の透過率は、47.5%である。光学調整部材22の吸収率は、5.0%である。光学調整部材22の幅(図5の幅X1あるいは幅Y1)は、3mmである。
(Configuration of Example 1)
With reference to FIG. 11 again, a specific configuration of the surface emitting unit according to the first embodiment will be described. As shown in FIG. 11, in Example 1, the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9). The reflectance of the optical adjustment member 22 is 47.5%. The transmittance of the optical adjustment member 22 is 47.5%. The absorptance of the optical adjustment member 22 is 5.0%. The width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 3 mm.
  (実施例2の構成)
 図11を再び参照して、実施例2に従う面発光ユニットの特有の構成について説明する。図11に示されるように、本実施例では、面発光パネル20の配光は、ランバート配光(図9参照)である。光学調整部材22の反射率は、47.5%である。光学調整部材22の透過率は、47.5%である。光学調整部材22の吸収率は、5.0%である。光学調整部材22の幅(図5の幅X1あるいは幅Y1)は、0.5mmである。
(Configuration of Example 2)
With reference to FIG. 11 again, a specific configuration of the surface emitting unit according to the second embodiment will be described. As shown in FIG. 11, in this embodiment, the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9). The reflectance of the optical adjustment member 22 is 47.5%. The transmittance of the optical adjustment member 22 is 47.5%. The absorptance of the optical adjustment member 22 is 5.0%. The width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 0.5 mm.
  (実施例3の構成)
 図11を再び参照して、実施例3に従う面発光ユニットの特有の構成について説明する。図11に示されるように、本実施例では、面発光パネル20の配光は、ランバート配光(図9参照)である。光学調整部材22の反射率は、30.0%である。光学調整部材22の透過率は、65.0%である。光学調整部材22の吸収率は、5.0%である。光学調整部材22の幅(図5の幅X1あるいは幅Y1)は、2.75mmである。
(Configuration of Example 3)
Referring to FIG. 11 again, a specific configuration of the surface emitting unit according to the third embodiment will be described. As shown in FIG. 11, in this embodiment, the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9). The reflectance of the optical adjustment member 22 is 30.0%. The transmittance of the optical adjustment member 22 is 65.0%. The absorptance of the optical adjustment member 22 is 5.0%. The width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 2.75 mm.
  (実施例4の構成)
 図11を再び参照して、実施例4に従う面発光ユニットの特有の構成について説明する。図11に示されるように、本実施例では、面発光パネル20の配光は、斜め配光(図9参照)である。光学調整部材22の反射率は、47.5%である。光学調整部材22の透過率は、47.5%である。光学調整部材22の吸収率は、5.0%である。光学調整部材22の幅(図5の幅X1あるいは幅Y1)は、3mmである。
(Configuration of Example 4)
With reference to FIG. 11 again, a specific configuration of the surface emitting unit according to the fourth embodiment will be described. As shown in FIG. 11, in this embodiment, the light distribution of the surface light emitting panel 20 is an oblique light distribution (see FIG. 9). The reflectance of the optical adjustment member 22 is 47.5%. The transmittance of the optical adjustment member 22 is 47.5%. The absorptance of the optical adjustment member 22 is 5.0%. The width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 3 mm.
  (実施例5の構成)
 図11を再び参照して、実施例5に従う面発光ユニットの特有の構成について説明する。図11に示されるように、本実施例では、面発光パネル20の配光は、ランバート配光(図9参照)である。光学調整部材22の反射率は、90%である。光学調整部材22の透過率は、0%である。光学調整部材22の吸収率は、10%である。光学調整部材22の幅(図5の幅X1あるいは幅Y1)は、2.83mmである。
(Configuration of Example 5)
With reference to FIG. 11 again, a specific configuration of the surface emitting unit according to the fifth embodiment will be described. As shown in FIG. 11, in this embodiment, the light distribution of the surface light emitting panel 20 is a Lambert light distribution (see FIG. 9). The reflectance of the optical adjustment member 22 is 90%. The transmittance of the optical adjustment member 22 is 0%. The absorptance of the optical adjustment member 22 is 10%. The width of the optical adjustment member 22 (width X1 or width Y1 in FIG. 5) is 2.83 mm.
 なお、本実施例においては、光学調整部材22にランダムに開口が設けられており、断面の長手方向(すなわち、図2の紙面左右方向)に所定の開口率および所定の開口幅のパターンを有する。図12は、実施例5における光学調整部材22の開口率および開口幅を示したグラフである。図12のグラフに示される横軸は、光学調整部材22の断面の長手方向に対する光学調整部材22の位置を示している。当該横軸の位置「0」は、光学調整部材22の中心に対応している。 In this embodiment, the optical adjustment member 22 is provided with openings at random, and has a pattern with a predetermined opening ratio and a predetermined opening width in the longitudinal direction of the cross section (that is, the left and right direction in FIG. 2). . FIG. 12 is a graph showing the aperture ratio and the aperture width of the optical adjustment member 22 in Example 5. The horizontal axis shown in the graph of FIG. 12 indicates the position of the optical adjustment member 22 with respect to the longitudinal direction of the cross section of the optical adjustment member 22. The position “0” on the horizontal axis corresponds to the center of the optical adjustment member 22.
 図12には、光学調整部材22の開口率と、光学調整部材22の開口幅との2つが示されている。ここでいう「開口率」とは、所定幅に対する開口幅の割合のことをいう。また、「開口幅」とは、当該所定幅において設けられるそれぞれの孔の幅のことをいう。 FIG. 12 shows two of the aperture ratio of the optical adjustment member 22 and the aperture width of the optical adjustment member 22. The “aperture ratio” here refers to the ratio of the opening width to the predetermined width. The “opening width” refers to the width of each hole provided in the predetermined width.
 たとえば、位置-1.0mm~+1.0mmの間における幅2mmの開口率が10%である場合には、光学調整部材22は、合計0.2mm分(=2.0mm×0.1)の開口が設けられる。この場合において、開口幅が0.01mmであるときには、光学調整部材22には、位置-1.0mm~+1.0mmの間に0.01mmの開口幅を有する20個(=0.2mm/0.01mm)の孔が設けられる。 For example, when the aperture ratio of the width of 2 mm between the position of −1.0 mm and +1.0 mm is 10%, the optical adjustment member 22 has a total of 0.2 mm (= 2.0 mm × 0.1). An opening is provided. In this case, when the opening width is 0.01 mm, the optical adjustment member 22 has 20 pieces (= 0.2 mm / 0) having an opening width of 0.01 mm between the positions −1.0 mm to +1.0 mm. .01 mm) holes are provided.
  (シミュレーション結果)
 図13および図14を参照して、比較例に従う面発光ユニット200(図10参照)と実施例1~5に従う面発光ユニットとの規格化輝度を比較したシミュレーション結果について説明する。図13は、比較例に従う面発光ユニット200と実施例1,2に従う面発光ユニットとの輝度プロファイルを示す図である。図14は、比較例に従う面発光ユニット200と実施例3~5に従う面発光ユニットとの輝度プロファイルを示す図である。
(simulation result)
With reference to FIG. 13 and FIG. 14, simulation results comparing the normalized luminance of the surface light emitting unit 200 (see FIG. 10) according to the comparative example and the surface light emitting units according to Examples 1 to 5 will be described. FIG. 13 is a diagram illustrating luminance profiles of the surface light emitting unit 200 according to the comparative example and the surface light emitting units according to the first and second embodiments. FIG. 14 is a diagram showing luminance profiles of the surface light emitting unit 200 according to the comparative example and the surface light emitting units according to the examples 3 to 5.
 図13および図14のグラフに示される横軸は、図2の紙面左右方向の拡散部材26の位置を示している。当該横軸の位置「0」は、拡散部材26の中心位置に対応している。図13および図14のグラフに示される縦軸は、最も明るい位置(すなわち、位置0mm)の輝度を1000とした規格化輝度を示している。規格化輝度は、拡散部材26上における輝度である。 The horizontal axis shown in the graphs of FIG. 13 and FIG. 14 indicates the position of the diffusing member 26 in the left-right direction in FIG. The position “0” on the horizontal axis corresponds to the center position of the diffusion member 26. The vertical axis shown in the graphs of FIGS. 13 and 14 indicates the normalized luminance with the luminance at the brightest position (that is, position 0 mm) as 1000. The normalized luminance is the luminance on the diffusing member 26.
 図13および図14に示されるように、非発光領域RBに対応する領域(すなわち、-1.75mm未満および1.75mm以上の位置)の輝度は、実施例1~5の全てで比較例よりも高くなっている。すなわち、発光領域RAに対する非発光領域RBの相対的な輝度が上がっており、非発光領域RBが発光領域RAに対して目立ちにくくなっていることが分かる。 As shown in FIGS. 13 and 14, the brightness of the region corresponding to the non-light emitting region RB (that is, the position of less than −1.75 mm and 1.75 mm or more) is higher in all of Examples 1 to 5 than in the comparative example. Is also high. That is, it can be seen that the relative luminance of the non-light-emitting area RB with respect to the light-emitting area RA is increased, and the non-light-emitting area RB is less conspicuous than the light-emitting area RA.
 以上説明した面発光ユニットは、発光面を有する面発光パネルと、表面および裏面を有し、かつ発光面と裏面とが対向するように設けられている第1透過部材と、第1透過部材の表面に対向するように設けられ、第1透過部材の表面からの光を減光するための光学調整部材と、光学調整部材の第1透過部材の側とは反対側の面に対向するように設けられている拡散部材とを備える。面発光パネルの発光面は、光を放射する発光領域と、発光領域の外周に位置し、光を放射しない非発光領域とを含む。光学調整部材の少なくとも一部分は、発光領域に対向するように設けられている。光学調整部材の面内の所定方向の幅は、当該面内の少なくとも一方向において、発光領域の所定方向の幅よりも短い。 The surface light emitting unit described above includes a surface light emitting panel having a light emitting surface, a first transmissive member having a front surface and a back surface, and the light emitting surface and the back surface being opposed to each other; An optical adjustment member for reducing light from the surface of the first transmission member, and a surface opposite to the first transmission member side of the optical adjustment member. Provided with a diffusion member. The light emitting surface of the surface light emitting panel includes a light emitting region that emits light and a non-light emitting region that is located on the outer periphery of the light emitting region and does not emit light. At least a portion of the optical adjustment member is provided to face the light emitting region. The width in the predetermined direction within the surface of the optical adjustment member is shorter than the width in the predetermined direction of the light emitting region in at least one direction within the surface.
 好ましくは、面発光パネルと拡散部材との間の距離は、発光領域内において光学調整部材に覆われていない領域の所定方向の幅よりも長い。 Preferably, the distance between the surface light-emitting panel and the diffusing member is longer than the width in a predetermined direction of the region not covered by the optical adjustment member in the light emitting region.
 好ましくは、面発光ユニットは、表面および裏面を有し、光学調整部材と拡散部材との間に設けられている第2透過部材をさらに備える。面発光パネルの発光面は、第1透過部材の裏面と接している。第1透過部材の表面は、光学調整部材の一方の面と接している。光学調整部材の他方の面は、第2透過部材の裏面と接している。第2透過部材の表面は、拡散部材の一方の面と接している。 Preferably, the surface light emitting unit further includes a second transmission member having a front surface and a back surface and provided between the optical adjustment member and the diffusion member. The light emitting surface of the surface light emitting panel is in contact with the back surface of the first transmission member. The surface of the first transmission member is in contact with one surface of the optical adjustment member. The other surface of the optical adjustment member is in contact with the back surface of the second transmission member. The surface of the second transmission member is in contact with one surface of the diffusion member.
 好ましくは、面発光パネルの非発光領域上には、反射部材が設けられている。
 好ましくは、面発光パネルから放射される光の発光面と垂直な平面における配光曲線を描いた場合に、発光面の法線方向に延在する光軸に沿った正面側の輝度を1とし、平面内において光軸との間で形成される角がθである方向の輝度をLとすると、配光曲線が、L>cosθの条件を満たす部分を少なくとも有している。
Preferably, a reflective member is provided on the non-light emitting area of the surface light emitting panel.
Preferably, when a light distribution curve in a plane perpendicular to the light emitting surface of light emitted from the surface emitting panel is drawn, the luminance on the front side along the optical axis extending in the normal direction of the light emitting surface is set to 1. When the luminance in the direction in which the angle formed with the optical axis in the plane is θ is L, the light distribution curve has at least a portion satisfying the condition of L> cos θ.
 上記の構成によれば、面発光ユニットは、厚みを薄く保ちつつ、非発光領域を従来よりも目立ちにくくすることができる。 According to the above configuration, the surface light emitting unit can make the non-light emitting region less noticeable than the conventional one while keeping the thickness thin.
 今回開示された実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内での全ての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
 12 陽極、13 発光層、14 陰極、15 封止部材、16 絶縁層、17,18 電極取出部、20 面発光パネル、20A,21A,22A,24A,26A 表面、20S 発光面、21,24 透過部材、21B,22B,24B,26B 裏面、22 光学調整部材、26 拡散部材、30 反射部材、31,32 配光曲線、50 タブレット端末、51 筺体、52,53 表示部、100,100A,100B,200 面発光ユニット、H 距離、LA~LC,W,W2,X1,X2,Y1,Y2 幅、P1,P2,Q1,Q2 点、RA 発光領域、RB 非発光領域、T 厚み。 12 anode, 13 light emitting layer, 14 cathode, 15 sealing member, 16 insulating layer, 17, 18 electrode extraction part, 20 surface light emitting panel, 20A, 21A, 22A, 24A, 26A surface, 20S light emitting surface, 21, 24 transmission Member, 21B, 22B, 24B, 26B back surface, 22 optical adjusting member, 26 diffusing member, 30 reflecting member, 31, 32 light distribution curve, 50 tablet terminal, 51 housing, 52, 53 display unit, 100, 100A, 100B, 200 Surface emitting unit, H distance, LA to LC, W, W2, X1, X2, Y1, Y2 width, P1, P2, Q1, Q2 points, RA light emitting area, RB non-light emitting area, T thickness.

Claims (5)

  1.  発光面を有する面発光パネルと、
     表面および裏面を有し、かつ前記発光面と前記裏面とが対向するように設けられている第1透過部材と、
     前記第1透過部材の前記表面に対向するように設けられ、前記第1透過部材の前記表面からの光を減光するための光学調整部材と、
     前記光学調整部材の前記第1透過部材の側とは反対側の面に対向するように設けられている拡散部材とを備え、
     前記面発光パネルの前記発光面は、光を放射する発光領域と、前記発光領域の外周に位置し、光を放射しない非発光領域とを含み、
     前記光学調整部材の少なくとも一部分は、前記発光領域に対向するように設けられており、
     前記光学調整部材の面内の所定方向の幅は、当該面内の少なくとも一方向において、前記発光領域の前記所定方向の幅よりも短い、面発光ユニット。
    A surface-emitting panel having a light-emitting surface;
    A first transmissive member having a front surface and a back surface and provided so that the light emitting surface and the back surface face each other;
    An optical adjustment member provided to face the surface of the first transmission member, and for dimming light from the surface of the first transmission member;
    A diffusing member provided to face the surface of the optical adjustment member opposite to the first transmission member side;
    The light emitting surface of the surface emitting panel includes a light emitting region that emits light, and a non-light emitting region that is located on the outer periphery of the light emitting region and does not emit light,
    At least a part of the optical adjustment member is provided to face the light emitting region,
    The surface emitting unit, wherein a width of the optical adjustment member in a predetermined direction is shorter than a width of the light emitting region in the predetermined direction in at least one direction of the surface.
  2.  前記面発光パネルと前記拡散部材との間の距離は、前記発光領域内において前記光学調整部材に覆われていない領域の前記所定方向の幅よりも長い、請求項1に記載の面発光ユニット。 2. The surface emitting unit according to claim 1, wherein a distance between the surface emitting panel and the diffusing member is longer than a width in the predetermined direction of a region not covered with the optical adjustment member in the light emitting region.
  3.  前記面発光ユニットは、表面および裏面を有し、前記光学調整部材と前記拡散部材との間に設けられている第2透過部材をさらに備え、
     前記面発光パネルの前記発光面は、前記第1透過部材の前記裏面と接しており、
     前記第1透過部材の前記表面は、前記光学調整部材の一方の面と接しており、
     前記光学調整部材の他方の面は、前記第2透過部材の前記裏面と接しており、
     前記第2透過部材の前記表面は、前記拡散部材の一方の面と接している、請求項1または2に記載の面発光ユニット。
    The surface light emitting unit further includes a second transmission member having a front surface and a back surface and provided between the optical adjustment member and the diffusion member,
    The light emitting surface of the surface light emitting panel is in contact with the back surface of the first transmission member,
    The surface of the first transmission member is in contact with one surface of the optical adjustment member,
    The other surface of the optical adjustment member is in contact with the back surface of the second transmission member,
    The surface emitting unit according to claim 1, wherein the surface of the second transmissive member is in contact with one surface of the diffusing member.
  4.  前記面発光パネルの前記非発光領域上には、反射部材が設けられている、請求項1~3のいずれか1項に記載の面発光ユニット。 The surface emitting unit according to any one of claims 1 to 3, wherein a reflective member is provided on the non-light emitting region of the surface emitting panel.
  5.  前記面発光パネルから放射される光の前記発光面と垂直な平面における配光曲線を描いた場合に、前記発光面の法線方向に延在する光軸に沿った正面側の輝度を1とし、前記平面内において前記光軸との間で形成される角がθである方向の輝度をLとすると、前記配光曲線が、L>cosθの条件を満たす部分を少なくとも有している、請求項1~4のいずれか1項に記載の面発光ユニット。 When a light distribution curve of light emitted from the surface light emitting panel is drawn in a plane perpendicular to the light emitting surface, the luminance on the front side along the optical axis extending in the normal direction of the light emitting surface is set to 1. The light distribution curve has at least a portion satisfying the condition of L> cos θ, where L is the luminance in the direction in which the angle formed with the optical axis in the plane is θ. Item 5. The surface emitting unit according to any one of Items 1 to 4.
PCT/JP2015/080511 2014-11-19 2015-10-29 Surface light emitting unit WO2016080169A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2017217111A1 (en) * 2016-06-14 2017-12-21 コニカミノルタ株式会社 Light emitting module

Citations (2)

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JP2010033780A (en) * 2008-07-25 2010-02-12 Panasonic Electric Works Co Ltd Organic electroluminescent element, and luminescent color adjusting method for the organic electroluminescent element
JP2014110102A (en) * 2012-11-30 2014-06-12 Konica Minolta Inc Surface light-emitting unit

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2010033780A (en) * 2008-07-25 2010-02-12 Panasonic Electric Works Co Ltd Organic electroluminescent element, and luminescent color adjusting method for the organic electroluminescent element
JP2014110102A (en) * 2012-11-30 2014-06-12 Konica Minolta Inc Surface light-emitting unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017217111A1 (en) * 2016-06-14 2017-12-21 コニカミノルタ株式会社 Light emitting module

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