WO2010064473A1 - 照明装置、表示装置、及びテレビ受信装置 - Google Patents
照明装置、表示装置、及びテレビ受信装置 Download PDFInfo
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- WO2010064473A1 WO2010064473A1 PCT/JP2009/064555 JP2009064555W WO2010064473A1 WO 2010064473 A1 WO2010064473 A1 WO 2010064473A1 JP 2009064555 W JP2009064555 W JP 2009064555W WO 2010064473 A1 WO2010064473 A1 WO 2010064473A1
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- light
- light emitting
- emitting surface
- led
- light guide
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133613—Direct backlight characterized by the sequence of light sources
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.
- Patent Document 1 As an example of a liquid crystal display device that is designed to be thin and large, one described in Patent Document 1 below is known.
- This has a light source that emits light in a direction substantially parallel to the display surface of the liquid crystal panel, and a light incident surface that faces the light source at the side edge (side edge) and that receives light from the light source.
- a light guide plate having a light emission surface for emitting light toward the display surface of the liquid crystal panel on the surface, and a plurality of light guide plates and light sources arranged in parallel along the arrangement direction thereof, and Adjacent light guide plates are arranged so as to partially overlap each other. JP 2001-93321 A
- the adjacent light guide plates are overlapped for the following reason. That is, when an LED including a plurality of LED chips that emit monochromatic light is used as the light source, it is necessary to mix the monochromatic light emitted from each LED chip in the process of propagating through the light guide plate. At this time, since the optical path length of the light propagating through the light guide plate has to be secured to some extent, a light guide unit having no light exit surface may be provided on the light guide plate. And when this light guide part is exposed to the front side, there exists a possibility that it may be visually recognized as a dark part, Therefore The light guide plate adjacent to the light guide part is overlapped.
- the present invention has been completed based on the above circumstances, and an object thereof is to sufficiently secure the optical path length of light propagating through the light guides without overlapping the light guides.
- An illuminating device of the present invention includes a light source having a light emitting surface, a light incident surface arranged to face the light emitting surface and receiving light from the light emitting surface, and a light emitting surface for emitting light.
- a light body, and the light emitting surface and the light incident surface are inclined with respect to a surface orthogonal to the light emitting surface.
- the following configuration is preferable as an embodiment of the present invention.
- the light emitting surface is inclined so as to face the light emitting surface side with respect to a surface orthogonal to the light emitting surface, and the light incident surface is parallel to the light emitting surface. In this way, the light incident on the light incident surface from the light emitting surface can be angled so as to be once directed toward the light emitting surface and totally reflected at the interface with the outside.
- the light source is disposed at one end of both ends of the light guide in one direction along the light exit surface.
- the light emitting surface of the light source disposed at one end of the light guide is tilted so as to face the light exit surface, the light emitting surface faces the other end of the light guide. Will be tilted. Thereby, the light emitted from the light emitting surface can be favorably propagated to the other end of the light guide.
- the light source is provided with a pair of light emitting surfaces facing opposite sides of the top, and the light guide is provided with a pair of light incident surfaces facing the pair of light emitting surfaces. It has been. If it does in this way, the light emitted from a pair of light-emitting surfaces which face the other side across the top will be favorably propagated in the light guide by being incident on a pair of light-incident surfaces facing each other.
- the pair of light emitting surfaces and the pair of light incident surfaces have substantially the same inclination angle with respect to a surface orthogonal to the light emitting surface. In this way, the light emitted from each light emitting surface and incident on the corresponding light incident surface can be propagated uniformly in the light guide.
- the light source includes a plurality of light emitting elements linearly parallel along one direction along the light emitting surface, and the light emitting surface extends along a parallel direction of the light emitting elements. Yes. If it does in this way, it will become suitable for a large-sized light guide by using a light source which arranged many light emitting elements in parallel and made an array. Thereby, since the installation number of a light guide can be reduced, the reduction of an assembly man-hour and cost reduction can be aimed at.
- a scattering structure that scatters light is provided on a surface of the light guide opposite to the light emitting surface, and a reflecting member that reflects light toward the light emitting surface is attached. .
- the light can be scattered by the scattering structure, and the scattered light is emitted by the reflecting member. Since the light can be reflected to the surface side, the light utilization efficiency can be improved.
- the scattering structure is formed such that the degree of light scattering is gradually increased in the direction away from the light source with respect to the direction along the light exit surface.
- the amount of light in the light guide is relatively larger on the side closer to the light source than on the far side in the direction along the light exit surface. Accordingly, with respect to the degree of light scattering in the scattering structure, the side near the light source with a large amount of light is relatively lowered to reduce the light reflected by the reflecting member, while the side far from the light source with a small amount of light is relatively high. Then, by increasing the light reflected by the reflecting member, the in-plane distribution of the amount of light reflected by the reflecting member can be made uniform. Therefore, it is suitable for suppressing luminance unevenness.
- the scattering structure includes a large number of microscopic concave portions or convex portions. In this way, light can be favorably scattered by a large number of microscopic concave portions or convex portions.
- microscopic means that it is difficult to recognize a specific shape only by looking at the outer shape, and that the specific shape can be finally recognized using a magnifying glass or a microscope.
- the light source is an LED. In this way, it is possible to increase the brightness.
- the LED includes a plurality of types of LED chips having different main emission wavelengths. In this way, since the optical path length of the light propagating through the light guide is sufficiently secured, the light emitted from each LED chip is well mixed in the process of propagating through the light guide.
- a plurality of the light sources are arranged for one light guide. In this way, the luminance can be improved.
- a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
- the illumination device that supplies light to the display panel has a sufficient optical path length of the light propagating through the light guide, and unevenness in the light emitted from the light emitting surface is less likely to occur. Therefore, it is possible to realize display with excellent display quality.
- a liquid crystal panel can be exemplified as the display panel.
- Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- Exploded perspective view showing schematic configuration of liquid crystal panel and backlight device Sectional drawing which shows the state which cut
- the top view which shows the arrangement state of LED and a light-guide plate Sectional drawing which shows the state which cut
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 16 ... LED (light source, light emitting diode), 16b ... LED chip (light emitting element), 16d ... Light emitting surface, 16d1 ... first light emitting surface (light emitting surface), 16d2 ... second light emitting surface (light emitting surface), 18 ... light guide plate (light guide), 18b ... light incident surface, 18b1 ... first light incident surface (light) Incident surface), 18b2 ... second light incident surface (light incident surface), 18c ... light exit surface, 18e ... installation surface (surface opposite to the light exit surface), 22 ... reflective sheet (reflective member), 23 ... Scattering structure, 23a ... convex portion, TV ... TV receiver
- FIGS. 1 A first embodiment of the present invention will be described with reference to FIGS.
- the liquid crystal display device 10 is illustrated.
- a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
- the upper side shown in FIG.2 and FIG.3 be a front side, and let the lower side of the figure be a back side.
- the television receiver TV includes a liquid crystal display device 10 (display device), front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a power source P.
- a tuner T is provided, and the display surface 11a is supported by the stand S along the vertical direction (Y-axis direction).
- the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 11 as a display panel and a backlight device 12 (illumination device) as an external light source, as shown in FIG. It is integrally held by a bezel 13 or the like having a shape.
- the display surface 11a is along the vertical direction” is not limited to an aspect in which the display surface 11a is parallel to the vertical direction, and the display surface 11a is installed in a direction along the vertical direction relative to the direction along the horizontal direction.
- it is meant to include those inclined at 0 ° to 45 °, preferably 0 ° to 30 ° with respect to the vertical direction.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially.
- the liquid crystal panel (display panel) 11 has a rectangular shape in plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. It is said.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film.
- a polarizing plate is disposed on the outside of both substrates.
- the backlight device 12 roughly includes a chassis 14 having a substantially box shape opened on the front side (the liquid crystal panel 11 side, the light emitting side), and an opening of the chassis 14.
- An optical member 15 disposed, an LED 16 (Light Emitting Diode) as a light source disposed in the chassis 14, an LED substrate 17 on which the LED 16 is mounted, and light emitted from the LED 16 to the optical member 15.
- a light guide plate 18 for guiding.
- the backlight device 12 is generated in association with the light emission of the LED 16, the receiving member 19 that receives the diffusion plates 15 a and 15 b constituting the optical member 15 from the back side, the pressing member 20 that presses the diffusion plates 15 a and 15 b from the front side. And a heat dissipating member 21 for promoting heat dissipation.
- the chassis 14 is made of metal and has a rectangular bottom plate 14a similar to the liquid crystal panel 11, a side plate 14b rising from the outer end of each side of the bottom plate 14a, and a receptacle projecting outward from the rising end of each side plate 14b. It consists of the board 14c, and has comprised the shallow substantially box shape (substantially shallow dish shape) opened toward the front side as a whole.
- the long side direction of the chassis 14 coincides with the horizontal direction (X-axis direction), and the short side direction coincides with the vertical direction (Y-axis direction).
- a receiving member 19 and a pressing member 20 can be placed on each receiving plate 14c in the chassis 14 from the front side.
- the bezel 13, the receiving member 19, and the pressing member 20 can be screwed to each receiving plate 14c.
- the bottom plate 14a is provided with a mounting structure (not shown) for mounting the LED substrate 17 and the light guide plate 18.
- the attachment structure is a screw hole for fastening the screw member or a screw insertion hole for inserting the screw member.
- the optical member 15 is interposed between the liquid crystal panel 11 and the light guide plate 18 and includes diffusion plates 15a and 15b arranged on the light guide plate 18 side and an optical sheet 15c arranged on the liquid crystal panel 11 side. Is done.
- the diffusing plates 15a and 15b have a configuration in which a large number of diffusing particles are dispersed in a transparent resin base material having a predetermined thickness, and have a function of diffusing transmitted light.
- Two diffuser plates 15a and 15b having the same thickness are stacked and arranged.
- the optical sheet 15c has a sheet shape that is thinner than the diffusion plates 15a and 15b, and three optical sheets are laminated. Specifically, the optical sheet 15c is a diffusion sheet, a lens sheet, and a reflective polarizing sheet in order from the diffusion plates 15a and 15b side (back side).
- Both the receiving member 19 and the pressing member 20 have a frame shape along the outer peripheral edge of the liquid crystal panel 11 and the optical member 15.
- the receiving member 19 is directly placed on the receiving plate 14 c in the chassis 14, and can receive the outer peripheral edge of the diffusion plate 15 b on the back side of the optical member 15 from the back side.
- the pressing member 20 is placed on the receiving member 19 and can hold the front diffusion plate 15a of the optical member 15 from the front side. Accordingly, the two diffusion plates 15 a and 15 b can be sandwiched between the receiving member 19 and the pressing member 20.
- the pressing member 20 can receive the outer peripheral edge of the liquid crystal panel 11 from the back side, and can hold the liquid crystal panel 11 between the bezel 13 that presses the outer peripheral edge of the liquid crystal panel 11 from the front side.
- the bezel 13 is formed in a frame shape so as to surround the display area of the liquid crystal panel 11, similarly to the receiving member 19 and the pressing member 20.
- the heat dissipating member 21 is made of a synthetic resin material or a metal material excellent in thermal conductivity and has a sheet shape, and extends along the inner surface of the bottom plate 14a of the chassis 14.
- the heat dissipation member 21 is disposed between the bottom plate 14 a of the chassis 14 and the LED substrate 17.
- the LED substrate 17 is made of a synthetic resin having a white surface with excellent light reflectivity.
- the LED substrate 17 extends along the bottom plate 14 a of the chassis 14 and is placed on the heat radiating member 21.
- a wiring pattern made of a metal film is formed on the LED substrate 17 and the LED 16 is mounted at a predetermined position.
- An external control board (not shown) is connected to the LED board 17, and power necessary for lighting the LED 16 is supplied from the LED board 17, and drive control of the LED 16 is possible.
- the LED board 17 is also provided with an attachment structure (not shown) for the chassis 14. For example, when the LED board 17 is attached by a screw member, a screw hole for tightening the screw member or a screw insertion hole for passing the screw member is provided as the attachment structure. .
- Such a mounting structure is also provided in the light guide plate 18 described below, and redundant description will be omitted.
- the LED 16 and the light guide plate 18 As shown in FIGS. 2 to 4, the LED 16 and the light guide plate 18 form a unit light emitter in a one-to-one correspondence group, and the display surface 11a (X-axis direction and The two-dimensionally parallel arrangement (planar arrangement) is performed along the (Y-axis direction).
- the LED 16 is a so-called surface mount type that is surface-mounted on the LED substrate 17, and has a grid pattern (in a matrix) in the X-axis direction and the Y-axis direction on the front side surface of the LED substrate 17. ) Many are arranged in parallel.
- the light guide plate 18 is disposed between the LED substrate 17 and the diffusion plate 15b on the back side of the optical member 15, and has a position corresponding to each LED 16 in the X-axis direction and the Y-axis direction, that is, in a grid pattern. Many are arranged in parallel (in a matrix, in a tile).
- the arrangement pitch (arrangement interval) of the LEDs 16 on the LED substrate 17 is substantially the same as the arrangement pitch of the light guide plates 18.
- the light guide plates 18 do not overlap each other in a plan view with respect to the light guide plates 18 adjacent to each other in the X-axis direction and the Y-axis direction, and are arranged with a predetermined interval (gap, clearance) therebetween.
- the LED 16 as a whole has a substantially block shape and a rectangular shape in plan view.
- the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction. It is arranged in the state.
- the LED 16 includes a substrate portion 16a fixed to the LED substrate 17, an LED chip 16b mounted on the substrate portion 16a, and a resin material 16c for sealing the LED chip 16b. Yes.
- the back surface of the substrate portion 16 a is soldered to the land on the LED substrate 17.
- each LED chip 16b emits monochromatic light of R (red), G (green), and B (blue). It has become.
- the light emitted from the LED chips 16b of the respective colors is mixed with each other in the process of propagating through the light guide plate 18 to become white light.
- the resin material 16c is for fixing the LED chip 16b on the board
- the LED 16 has a light emitting surface 16d that is inclined with respect to the X-axis direction and the Z-axis direction (light emitting surface 18c and a surface orthogonal to the light emitting surface 18c described later).
- the cross-sectional shape cut along the X-axis direction and the Z-axis direction forms a substantially right triangle, and the hypotenuse is the light emitting surface 16d.
- substrate part 16a has comprised the cross-sectional substantially L shape extended to two sides except the oblique side. Therefore, the light emitting surface 16d has an inclination to face the upper right side (the light emitting surface 18c side and the other end side of the light guide plate 18) shown in FIG.
- the light emitting surface 16d extends along the Y-axis direction and has a constant inclination angle (inclination angle) over the entire region in the Y-axis direction. Note that the inclination angle of the light emitting surface 16d with respect to the X-axis direction and the Z-axis direction depends on the ratio of the dimension in the X-axis direction and the dimension in the Z-axis direction of the substrate portion 16a (LED 16). The inclination angle is not limited to the illustrated embodiment, but can be changed as appropriate.
- the optical axis LA of the LED 16 substantially coincides with the normal direction to the light emitting surface 16d. Therefore, the optical axis LA is inclined with respect to the X-axis direction and the Z-axis direction, like the light emitting surface 16d.
- the light emitted from the light emitting surface 16d of the LED 16 spreads radially to some extent within a predetermined angle range around the optical axis LA, but its directivity is higher than that of a cold cathode tube or the like. It has become. That is, the emission intensity of the LED 16 shows an angular distribution that tends to decrease as the direction along the optical axis LA increases and the tilt angle with respect to the optical axis LA increases. Therefore, most of the light emitted from the light emitting surface 16d goes to the upper right side shown in FIG. 5 along the optical axis LA.
- the light guide plate 18 is made of a synthetic resin material (for example, polycarbonate) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIGS. 4 and 5, the light guide plate 18 has a plate shape as a whole and a rectangular shape in plan view. The long side direction coincides with the X-axis direction, and the short side direction coincides with the Y-axis direction. It is arranged in a state of letting. As shown in FIG. 5, the light guide plate 18 is interposed between the LED substrate 17 and the diffusion plate 15 b and is attached to the LED substrate 17. The LED 16 mounted on the LED substrate 17 is attached to the light guide plate 18. Covered from the front.
- a synthetic resin material for example, polycarbonate
- the LED 16 is disposed at a position directly below the light guide plate 18.
- An LED housing recess 18 a capable of housing the LEDs 16 is formed on the back surface of the light guide plate 18, that is, the surface facing the LED substrate 17.
- the LED housing recess 18a is arranged at the left end portion (one end portion) shown in FIGS. 4 and 5 among both end portions of the light guide plate 18 in the X-axis direction (one direction along a light emission surface 18c described later).
- Each dimension is set larger than each dimension of the LED 16. Accordingly, in the accommodated state, the LED 16 is disposed on the left end portion of the light guide plate 18 shown in FIGS.
- the LED housing recess 18a is configured to open on the back side (the side opposite to the light emitting surface 18c side) and also on the left side shown in FIG.
- the surface opposite to the light emitting surface 16d of the LED 16 in the inner surface of the LED housing recess 18a is a light incident surface 18b for allowing the light emitted from the light emitting surface 16d to enter the light guide plate 18, respectively.
- a light emitting surface 18c that emits light in the light guide plate 18 is provided on the front side surface of the light guide plate 18, that is, the surface facing the diffusion plate 15b.
- the light emission surface 18c is substantially parallel along the X-axis direction and the Y-axis direction, and is a substantially straight surface both macroscopically and microscopically.
- each side end face 18 d facing the adjacent light guide plates 18 with a gap is formed in a substantially parallel form along the Z-axis direction, and is macroscopically microscopic. It is almost straight.
- the light exit surface 18c is a boundary surface with the air layer AR held between the diffuser plate 15b (optical member 15) adjacent in the Z-axis direction, whereas each side end surface 18 is in the X-axis direction. And it is a boundary surface with the air layer AR held between the light guide plates 18 adjacent in the Y-axis direction.
- the light in the light guide plate 18 hits the light emitting surface 18c and each side end surface 18d, which are the boundary surfaces with the external air layer AR, there is almost no irregular reflection of light there, so the light emitting surface 18c.
- the incident angle with respect to each side end face 18d exceeds the critical angle, the light is totally reflected and propagates in the light guide plate 18, and hardly leaks to the outside (air layer AR) from the light exit face 18c and each side end face 18d.
- “macroscopic” means that a specific shape can be easily recognized by looking at the outer shape, and “microscopic” means only by looking at the outer shape. It is difficult to recognize a specific shape, and the extent to which a specific shape can be finally recognized using a magnifying glass or a microscope is shown.
- the light incident surface 18b is parallel to the light emitting surface 16d of the LED 16, and is inclined with respect to the X-axis direction and the Z-axis direction (a surface orthogonal to the light emitting surface 18c and the light emitting surface 18c). .
- the LED housing recess 18a has a substantially right-angled triangular cross-section so as to match the cross-sectional shape along the X-axis direction and the Z-axis direction of the LED 16, and the hypotenuse is the light incident surface 18b.
- the light incident surface 18b is a surface substantially parallel to the light emitting surface 16d, and has an inclination that faces the lower left oblique side shown in FIG.
- the light incident surface 18b extends along the Y-axis direction and has a constant inclination angle over the entire region in the Y-axis direction. Note that the inclination angle of the light incident surface 18b with respect to the X-axis direction or the Z-axis direction is set substantially equal to the inclination angle of the light emitting surface 16d.
- the installation surface 18e of the reflection sheet 22 has an inclination that faces diagonally downward to the right as shown in FIG. 5, that is, in the X-axis direction, opposite to the light incident surface 18b, with respect to the light incident surface 18b. Is obtuse. That is, the light guide plate 18 is moved from the boundary position between the light incident surface 18b and the installation surface 18e of the reflection sheet 22 to the right end portion (the end portion opposite to the LED 16 installation side) shown in FIG.
- the taper shape is such that the thickness dimension decreases gradually and continuously.
- the scattering structure 23 is constituted by a number of microscopic convex portions 23a formed on the installation surface 18e of the reflection sheet 22 by a molding die (not shown) used when the light guide plate 18 is molded with resin.
- the convex portion 23 a has, for example, a cross-sectional chevron shape (substantially triangular cross-section) and is configured to extend along the Y-axis direction, and is arranged in parallel in the X-axis direction. Yes.
- the arrangement pitch of the projections 23a is unequal, and on the installation surface 18e of the reflection sheet 22, as it goes from the left end to the right end shown in FIG. 5, that is, in the direction away from the LED 16.
- each convex part 23a is regularly formed so that the distribution density in the plane of the installation surface 18e of the reflection sheet 22 is lower as it is closer to the LED 16 and higher as it is farther from the LED 16.
- the light traveling toward the installation surface 18e of the reflection sheet 22 in the light guide plate 18 is scattered by hitting the inclined surface of each convex portion 23a.
- the degree of light scattering is related to the X-axis direction along the installation surface 18e. The side closer to the LED 16 is relatively low, and the side far from the LED 16 is relatively high, and tends to be gradually higher as the distance from the LED 16 increases, and gradually lower as the LED 16 is approached.
- the rise of light on the light emitting surface 18c is relatively suppressed, whereas the light amount is relatively large.
- the rise of light on the light exit surface 18c is relatively accelerated, so that the in-plane distribution of the rise amount of light on the reflection sheet 22 and the installation surface 18e is made uniform (leveling).
- the clearance gap between the reflection sheet 22 and the convex part 23a formed in the installation surface 18e becomes the air layer AR.
- This embodiment has the structure as described above, and its operation will be described next.
- the power of the liquid crystal display device 10 is turned on and each LED 16 is turned on, the light emitted from the light emitting surface 16d of the LED 16 enters the light incident surface 18b of the opposing light guide plate 18 as shown in FIG. Then, after propagating through the light guide plate 18, the light exits from the light exit surface 18c.
- most of the light incident on the light incident surface 18b is directed to the light emitting surface 18c along the optical axis LA of the LED 16.
- the inclination angles of the light emitting surface 16d and the light incident surface 18b are set.
- the light along the optical axis LA is angled with respect to the light exit surface 18c so as to exceed a critical angle.
- most of the light incident on the light incident surface 18b is first totally reflected at the interface between the light emitting surface 18c and the external air layer AR and travels toward the back side, that is, the reflective sheet 22 side.
- the light traveling toward the reflection sheet 22 is scattered by the scattering structure 23 formed on the installation surface 18e, and is reflected by the reflection sheet 22 toward the light exit surface 18c again.
- Light that is not totally reflected by the surface 18c (light that does not exceed the critical angle with respect to the light exit surface 18c) is emitted from the light exit surface 18c to the outside on the front side, but is totally reflected by the light exit surface 18c (light exit)
- the light exceeding the critical angle with respect to the surface 18c is returned to the reflection sheet 22 side again.
- the light propagates almost in the entire area of the light guide plate 18 and is eventually emitted from the light emitting surface 18c to the outside on the front side.
- the light propagating through the light guide plate 18 is particularly indicated by an arrow line.
- the degree of light scattering by the convex portion 23a that forms the scattering structure formed on the installation surface 18e of the reflection sheet 22 is lower on the side closer to the LED 16 and higher on the side farther from the LED 16;
- the rise of light is suppressed in a region where the amount of light in the light plate 18 is large, and the rise of light is promoted in a region where the amount of light in the light guide plate 18 is relatively small.
- the in-plane distribution of the reflection sheet 22 and the installation surface 18e can be made uniform with respect to the amount of light rising from the reflection sheet 22 and its installation surface 18e toward the light emission surface 18c.
- the light incident on the light incident surface 18b along the optical axis LA by tilting the light emitting surface 16d and the light incident surface 18b at a predetermined angle with respect to the X axis direction and the Z axis direction. Is angled so as to hit the region of the light exit surface 18c directly above the light incident surface 18b and to perform the first total reflection there. Therefore, if compared with the case where the light emitting surface and the light incident surface are orthogonal to the X-axis direction and the Y-axis direction (parallel to the Z-axis direction) and the optical axis is parallel to the X-axis direction, it is closer to the LED 16.
- the first total reflection is performed at the position.
- the average number of reflections of the light propagating in the light guide plate 18 can be increased, and the optical path length of the light propagating in the light guide plate 18 can be sufficiently increased. Therefore, the monochromatic light emitted from each LED chip 16b of the LED 16 is sufficiently mixed in the process of propagating through the light guide plate 18 to become white light, and is emitted from the light emitting surface 18c. It is hard to occur.
- the backlight device 12 includes the LED 16 having the light emitting surface 16d, the light incident surface 18b that is arranged to face the light emitting surface 16d and receives light from the light emitting surface 16d, And a light guide plate 18 having a light output surface 18c for emitting light, a plurality of light guide plates 18 are arranged in parallel in the direction along the light output surface 18c, and the light emitting surface 16d and the light incident surface 18b are light output. It is inclined with respect to a surface orthogonal to the surface 18c.
- the light emitted from the light emitting surface 16d of the LED 16 and incident on the light incident surface 18b of the light guide plate 18 is totally reflected at the interface with the outside of the light guide plate 18, for example. After being propagated, the light exits from the light exit surface 18c.
- the light emitting surface 16d and the light incident surface 18b are inclined with respect to the surface orthogonal to the light emitting surface 18c, it is assumed that the light emitting surface and the light incident surface are orthogonal to the light emitting surface 18c.
- the light propagating through the light guide plate 18 can be angled so that the number of reflections at the interface is relatively large. Thereby, the optical path length of the light propagating through the light guide plate 18 can be sufficiently ensured.
- a light guide portion that does not emit light is provided on the light guide plate, but the light guide portion is on the front side.
- the light guide portion is on the front side.
- the light guide plates are overlapped, for example, when a defect is found in any LED during the manufacturing process or repair due to a failure, not only the light guide plate corresponding to the LED in which the failure is found but also the light guide plate. Since it is necessary to remove all the light guide plate groups that are directly or indirectly superimposed on the optical plate, there is a problem that workability is extremely deteriorated.
- the present embodiment it is possible to sufficiently secure the optical path length of the light propagating through the light guide plate 18 without providing a light guide, so that the adjacent light guide plates 18 are overlapped with each other. There is no need to adopt an arrangement. Therefore, even if a defect is found in any of the LEDs 16 during the manufacturing process or during a repair due to a failure, it is sufficient to remove only the light guide plate 18 corresponding to the failed LED 16 and the workability is extremely good. The effect of becoming something can be obtained.
- the light emitting surface 16d is inclined so as to face the light emitting surface 18c side with respect to the surface orthogonal to the light emitting surface 18c, and the light incident surface 18b is parallel to the light emitting surface 16d. In this way, the light incident on the light incident surface 18b from the light emitting surface 16d can be angled so as to be once directed toward the light emitting surface 18c and totally reflected at the interface with the outside.
- the LED 16 is arranged at one end portion of both ends of the light guide plate 18 in one direction along the light emitting surface 18c. In this way, when the light emitting surface 16d of the LED 16 disposed at one end of the light guide plate 18 is tilted to face the light emitting surface 18c, the light emitting surface 16d becomes the other end side of the light guide plate 18. Will be tilted to face. Thereby, the light emitted from the light emitting surface 16d can be favorably propagated to the other end of the light guide plate 18.
- a scattering structure 23 that scatters light is provided on a surface (installation surface 18e) opposite to the light exit surface 18c of the light guide plate 18, and a reflection sheet 22 that reflects light toward the light exit surface 18c. Is attached.
- the light can be scattered by the scattering structure 23, and the scattered light is reflected by the reflection sheet. Since the light 22 can be reflected toward the light exit surface 18c, the light utilization efficiency can be improved.
- the scattering structure 23 is formed so that the degree of light scattering continuously and gradually increases in the direction away from the LED 16 with respect to the direction along the light emitting surface 18c.
- the amount of light in the light guide plate 18 is relatively greater on the side closer to the LED 16 than on the far side in the direction along the light exit surface 18c. Accordingly, with respect to the degree of light scattering in the scattering structure 23, the side closer to the LED 16 with a large amount of light is relatively lowered to reduce the light reflected by the reflection sheet 22, while the side far from the LED 16 with a small amount of light is relatively
- the in-plane distribution of the amount of light reflected by the reflection sheet 22 can be made uniform. Therefore, it is suitable for suppressing luminance unevenness.
- the scattering structure 23 is composed of a number of microscopic convex portions 23a. In this way, light can be scattered favorably by the large number of microscopic convex portions 23a.
- microscopic means that it is difficult to recognize a specific shape only by looking at the outer shape, and that the specific shape can be finally recognized using a magnifying glass or a microscope.
- the light source is an LED 16. In this way, it is possible to increase the brightness.
- the LED 16 includes a plurality of types of LED chips 16b having different main emission wavelengths. In this way, since the optical path length of the light propagating in the light guide plate 18 is sufficiently secured, the light emitted from each LED chip 16b is well mixed in the process of propagating in the light guide plate 18.
- Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. 6 or FIG. In this Embodiment 2, what changed LED16A and the light-guide plate 18A is shown.
- the same parts as those in the first embodiment are denoted by the same reference numerals and suffixed with the suffix A, and redundant description of the structure, operation, and effect is omitted.
- the LED 16 ⁇ / b> A is configured to extend linearly along the Y-axis direction, and the cross-sectional shape cut along the X-axis direction and the Z-axis direction has a substantially isosceles triangle. It has a shape.
- the length dimension (dimension in the Y-axis direction) of the LED 16A is approximately the same as or slightly shorter than the dimension in the Y-axis direction of the light guide plate 18A.
- the LED chip 16bA has three types of main emission wavelengths corresponding to R, G, and B, which are arranged at substantially the center position in the X-axis direction of the LED 16A, and one direction along the Y-axis direction, that is, the light emitting surface 18cA.
- the LEDs 16A according to the present embodiment are arrayed by arranging different types of LED chips 16bA in parallel in one direction, in other words, a linear light source such as a cold cathode tube.
- the LED 16A has a pair of light emitting surfaces 16d1 and 16d2 at a position sandwiching the top portion 16e. Both the light emitting surfaces 16d1 and 16d2 face opposite sides. Specifically, the first light emitting surface 16d1 on the left side shown in FIG. 6 is on the upper left side in FIG. 6, and the second light emitting surface 16d2 on the right side in FIG. It faces the upper right side of the figure.
- the inclination angles of the first light emitting surface 16d1 and the second light emitting surface 16d2 with respect to the X axis direction and the Z axis direction are substantially the same.
- the first light emitting surface 16d1 and the second light emitting surface 16d2 are configured to extend along the Y-axis direction, that is, the parallel direction of the LED chips 16bA, and have a constant inclination angle (inclination angle) over the entire region in the Y-axis direction. have.
- the first optical axis LA1 coinciding with the normal to the first light emitting surface 16d1 and the second optical axis LA2 coinciding with the normal to the second light emitting surface 16d2 are both inclined with respect to the X axis direction and the Z axis direction. Therefore, they are in a crossing relationship with each other.
- the light guide plate 18A is provided with three LED housing recesses 18aA capable of housing the LEDs 16A, at a predetermined interval in the X-axis direction. Accordingly, three LEDs 16A are installed corresponding to one light guide plate 18A according to the present embodiment.
- the LED housing recess 18aA has a cross-sectional shape along the X-axis direction and the Z-axis direction that is substantially an isosceles triangle shape in accordance with the LED 16A, and has a pair of inner surfaces opposed to the light emitting surfaces 16d1 and 16d2. It has light incident surfaces 18b1 and 18b2. Both the light incident surfaces 18b1 and 18b2 intersect with each other, but are inclined with respect to the X-axis direction and the Z-axis direction.
- the second light incident surface 18b2 on the right side of the drawing is parallel to the second light emitting surface 16d2 while it is parallel to the light emitting surface 16d1.
- Both the light incident surfaces 18b1 and 18b2 extend along the Y-axis direction and have a constant inclination angle over the entire region in the Y-axis direction.
- the inclination angles of the light incident surfaces 18b1 and 18b2 with respect to the X-axis direction or the Z-axis direction are substantially the same as each other and are set to be approximately equal to the inclination angles of the light emitting surfaces 16d1 and 16d2.
- the installation surface 18eA of the reflection sheet 22A in the light guide plate 18A is substantially parallel to the light emission surface 18cA over the entire area.
- the scattering structure 23A formed on the installation surface 18eA of the reflection sheet 22A is set as follows. That is, as shown in FIG. 7, the number of microscopic protrusions 23aA forming the scattering structure 23A has a lower distribution density (a wider arrangement pitch) closer to the LED 16A, and a higher distribution density toward the far side from the LED 16A. They are arranged in a gradation so that (the arrangement pitch is narrow).
- each convex portion 23aA has the highest distribution density at an intermediate position between the LEDs 16A, and as it approaches the LED 16A from there. Are arranged so that the distribution density gradually decreases continuously.
- each convex portion 23aA is an end portion of the light guide plate 18A.
- the distribution density is the highest and the distribution density gradually decreases from the LED 16A toward the LED 16A.
- the LED 16A is provided with a pair of light emitting surfaces 16d1 and 16d2 facing opposite sides and inclined with respect to the X-axis direction and the Z-axis direction, and a pair of light incident surfaces 18b1 and 18b2 corresponding to the light guide plate 18A. Since the light emitted from the light emitting surfaces 16d1 and 16d2 and incident on the light incident surfaces 18b1 and 18b2 first strikes the light emitting surface 18cA and is angled so as to be totally reflected to the reflecting sheet 22A side. Has been made. Thereby, the number of reflections of the light propagating through the light guide plate 18A can be increased, and the optical path length can be sufficiently obtained.
- the LED 16A is provided with a pair of light emitting surfaces 16d1 and 16d2 so as to face opposite sides of the top portion 16e, and the light guide plate 18A has a pair of light emitting surfaces 16d1 and 16d1.
- a pair of light incident surfaces 18b1 and 18b2 are provided so as to face 16d2.
- the light emitted from the pair of light emitting surfaces 16d1 and 16d2 facing opposite to each other across the top portion 16e is incident on the pair of light incident surfaces 18b1 and 18b2 opposed to the light guide plate 18A. Propagate well inside.
- the pair of light emitting surfaces 16d1 and 16d2 and the pair of light incident surfaces 18b1 and 18b2 have substantially the same inclination angle with respect to a surface orthogonal to the light emitting surface 18cA. In this way, light emitted from the light emitting surfaces 16d1 and 16d2 and incident on the corresponding light incident surfaces 18b1 and 18b2 can be propagated uniformly in the light guide plate 18A.
- the LED 16A includes a large number of LED chips 16bA that are linearly parallel along one direction along the light emitting surface 18cA, and the light emitting surfaces 16d1 and 16d2 extend along the parallel direction of the LED chips 16bA. ing. If it does in this way, it will become suitable for 18 A of enlarged light-guide plates by using LED16A which arranged many LED chips 16bA in parallel and arranged. Thereby, since the number of installation of the light guide plate 18A can be reduced, the number of assembling steps and the cost can be reduced.
- three (plural) LEDs 16A are arranged for one light guide plate 18A. In this way, the luminance can be improved.
- the inclination angles of the light emitting surface and the light incident surface with respect to the Z-axis direction and the X-axis direction can be appropriately changed. Further, in addition to the case where the light emitting surface and the light incident surface are completely parallel, those in which the light emitting surface and the light incident surface are relatively inclined are also included in the present invention.
- a configuration in which a plurality of LEDs are installed corresponding to one light guide plate is also included in the present invention.
- a pair of LEDs can be installed at both end positions of the light guide plate, and the light emitting surfaces of both LEDs can be set to face the center side of the light guide plate.
- the scattering degree of the scattering structure can be set in a gradation shape such that the scattering degree is higher at the center side of the light guide plate and the scattering degree is lower at both end sides of the light guide plate.
- the LED housing recess has a form that opens on two sides of the back surface and the side surface of the light guide plate.
- the LED housing recess opens only on the back surface of the light guide plate. Of course it is also possible.
- Embodiment 1 described above the reflective sheet installation surface is inclined.
- the present invention includes a configuration in which the reflective sheet installation surface is parallel to the light emitting surface.
- the arrayed LED shown in the second embodiment may be used.
- Embodiment 2 In Embodiment 2 described above, an array of three arrayed LEDs is shown in parallel, but the number of LEDs installed can be changed as appropriate.
- Embodiment 2 described above a configuration in which a plurality of three types of LED chips having different main emission wavelengths are arranged in parallel is shown, but a configuration in which three types of LED chips are installed one by one is also included in the present invention. .
- the LED installation position can be changed as appropriate.
- the scattering structure is provided with a large number of microscopic convex portions, but other than that, for example, a configuration in which a large number of microscopic concave portions are provided. It is included in the present invention.
- microscopic concave portions or convex portions may be formed by coating fine silica powder.
- a microscopic recess may be formed by performing a blasting process on the installation surface of the reflection sheet. Regardless of which method is used, it is also possible to arrange the concave or convex portions irregularly.
- the distribution density (scattering degree) of the microscopic projections provided as the scattering structure is continuously and gradually changed.
- the present invention also includes those in which the distribution density is sequentially changed step by step. Further, the present invention includes a microscopic concave portion or convex portion having a uniform distribution density.
- the reflective sheet is individually installed for each light guide plate.
- a single reflective sheet may be installed for a plurality of light guide plates. It is included in the present invention. In that case, a reflective sheet may be arranged in a region between adjacent light guide plates.
- an air layer is used as a low refractive index layer interposed between adjacent light guide plates.
- a low refractive index layer made of a low refractive index material is used as each gap in the light guide plate.
- the invention is also included in the present invention.
- the LED and the light guide plate have a rectangular shape when viewed in plan, but the LED or the light guide plate may have a square shape when viewed in plan.
- the LED and the light guide plate are two-dimensionally arranged in parallel in the chassis.
- the one-dimensionally parallel arrangement is also included in the present invention. include. Specifically, the LED and the light guide plate are arranged in parallel only in the vertical direction, and the LED and the light guide plate are arranged in parallel only in the horizontal direction are also included in the present invention. Further, the present invention can be applied to a case where only one set of LED and light guide plate is used.
- an LED using three types of LED chips each emitting R, G, and B in a single color is shown. However, one type of LED chip that emits blue or purple in a single color. In the present invention, an LED using a type of LED that emits white light with a phosphor is also included.
- the configuration of the optical member can be appropriately changed. Specifically, the number of diffusion plates and the number and type of optical sheets can be changed as appropriate. It is also possible to use a plurality of optical sheets of the same type.
- the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction.
- the liquid crystal panel and the chassis have the long side direction in the vertical direction.
- Those that are in a vertically placed state matched with are also included in the present invention.
- a TFT is used as a switching element of a liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)).
- a switching element other than TFT for example, a thin film diode (TFD)
- the present invention can also be applied to a liquid crystal display device for monochrome display.
- liquid crystal display device using the liquid crystal panel as the display element has been exemplified, but the present invention is also applicable to a display device using another type of display element.
- the television receiver provided with the tuner is exemplified, but the present invention can also be applied to a display device not provided with the tuner.
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Abstract
Description
上記したバックライト装置において、隣り合う導光板同士を重畳させているのは、次のような理由による。すなわち、光源として単色発光する複数のLEDチップを内蔵したLEDを用いた場合、各LEDチップから発せられた単色光を、導光板内を伝播する過程で混色させる必要がある。このとき、導光板内を伝播する光の光路長をある程度確保しなければならないため、導光板に光出射面を有さない導光部を設ける場合がある。そして、この導光部が表側に露出していると、暗部として視認されるおそれがあるため、導光部に対して隣り合う導光板を重畳させているのである。
本発明の照明装置は、発光面を有する光源と、前記発光面と対向状に配されるとともに前記発光面からの光が入射される光入射面、及び光を出射させる光出射面を有する導光体とを備え、前記発光面及び前記光入射面が前記光出射面と直交する面に対して傾いている。
(1)前記発光面は、前記光出射面と直交する面に対して前記光出射面側を向くよう傾いており、前記光入射面は、前記発光面に並行する形態とされる。このようにすれば、発光面から光入射面に入射した光を、一旦光出射面に向かわせ且つその外部との界面にて全反射させるよう角度付けすることが可能となる。
本発明によれば、導光体同士を重畳させることなく、導光体内を伝播する光の光路長を十分に確保することができる。
本発明の実施形態1を図1から図5によって説明する。本実施形態では、液晶表示装置10について例示する。なお、各図面の一部にはX軸、Y軸及びZ軸を示しており、各軸方向が各図面で示した方向となるように描かれている。また、図2及び図3に示す上側を表側とし、同図下側を裏側とする。
本発明の実施形態2を図6または図7によって説明する。この実施形態2では、LED16A及び導光板18Aを変更したものを示す。なお、この実施形態2では、上記した実施形態1と同様の部位には、同一の符号を用いるとともにその末尾に添え字Aを付すものとし、構造、作用及び効果について重複する説明は省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
Claims (15)
- 発光面を有する光源と、
前記発光面と対向状に配されるとともに前記発光面からの光が入射される光入射面、及び光を出射させる光出射面を有する導光体とを備え、
前記発光面及び前記光入射面が前記光出射面と直交する面に対して傾いている照明装置。 - 前記発光面は、前記光出射面と直交する面に対して前記光出射面側を向くよう傾いており、前記光入射面は、前記発光面に並行する形態とされる請求の範囲第1項記載の照明装置。
- 前記光源は、前記導光体のうち前記光出射面に沿う一方向に関する両端部のうち一方の端部に配されている請求の範囲第2項記載の照明装置。
- 前記光源には、前記発光面が頂部を挟んで互いに反対側を向くよう一対設けられるとともに、前記導光体には、一対の前記発光面に対向するよう前記光入射面が一対設けられている請求の範囲第2項記載の照明装置。
- 一対の前記発光面及び一対の前記光入射面は、前記光出射面と直交する面に対する傾き角度がほぼ同じとされている請求の範囲第4項記載の照明装置。
- 前記光源は、前記光出射面に沿う一方向に沿って直線的に並列する多数の発光素子を備え、前記発光面が前記発光素子の並列方向に沿って延在する形態とされている請求の範囲第1項から請求の範囲第5項のいずれか1項に記載の照明装置。
- 前記導光体のうち前記光出射面とは反対側の面には、光を散乱させる散乱構造が設けられるとともに、光を前記光出射面側へ反射させる反射部材が取り付けられている請求の範囲第1項から請求の範囲第6項のいずれか1項に記載の照明装置。
- 前記散乱構造は、光を散乱させる度合いが、前記光出射面に沿う方向に関して前記光源から遠ざかる方向へ向けて連続的に漸次高くなるよう形成されている請求の範囲第7項記載の照明装置。
- 前記散乱構造は、多数の微視的な凹部または凸部により構成されている請求の範囲第7項または請求の範囲第8項記載の照明装置。
- 前記光源は、LEDとされる請求の範囲第1項から請求の範囲第9項のいずれか1項に記載の照明装置。
- 前記LEDは、主発光波長の異なる複数種類のLEDチップを内蔵している請求の範囲第10項記載の照明装置。
- 前記光源は、1つの前記導光体に対して複数配されている請求の範囲第1項から請求の範囲第11項のいずれか1項に記載の照明装置。
- 請求の範囲第1項から請求の範囲第12項のいずれか1項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルとされる請求の範囲第13項記載の表示装置。
- 請求の範囲第13項または請求の範囲第14項に記載された表示装置を備えるテレビ受信装置。
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CN2009801485717A CN102239360A (zh) | 2008-12-05 | 2009-08-20 | 照明装置、显示装置和电视接收装置 |
US13/127,984 US20110211141A1 (en) | 2008-12-05 | 2009-08-20 | Lighting device, display device and television receiver |
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JP2008-311256 | 2008-12-05 | ||
JP2008311256 | 2008-12-05 |
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PCT/JP2009/064555 WO2010064473A1 (ja) | 2008-12-05 | 2009-08-20 | 照明装置、表示装置、及びテレビ受信装置 |
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CN (1) | CN102239360A (ja) |
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CN101893189A (zh) * | 2010-07-14 | 2010-11-24 | 深圳市华星光电技术有限公司 | 背光模块及显示装置 |
EP2546685A1 (en) * | 2011-07-15 | 2013-01-16 | LG Innotek Co., Ltd. | Backlight unit and display apparatus using the same |
WO2013105258A1 (ja) * | 2012-01-12 | 2013-07-18 | 日立コンシューマエレクトロニクス株式会社 | 映像表示装置、及び映像表示装置のバックライトユニット |
JP2022060592A (ja) * | 2019-09-30 | 2022-04-14 | 日亜化学工業株式会社 | 発光モジュール |
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JP5831404B2 (ja) * | 2012-08-30 | 2015-12-09 | ヤマハ株式会社 | 中継装置およびスピーカ装置 |
TWI487985B (zh) * | 2012-11-22 | 2015-06-11 | Radiant Opto Electronics Corp | 背光模組 |
CN105093675B (zh) * | 2015-07-30 | 2018-04-13 | 深圳市华星光电技术有限公司 | 一种背光模块 |
CN107991809A (zh) * | 2017-12-26 | 2018-05-04 | 中航华东光电有限公司 | 窄边框背光模组 |
JP2019125519A (ja) * | 2018-01-18 | 2019-07-25 | シャープ株式会社 | 照明装置および表示装置 |
US10880009B2 (en) * | 2019-05-24 | 2020-12-29 | Sonos, Inc. | Control signal repeater system |
CN111708220A (zh) | 2020-06-23 | 2020-09-25 | 武汉华星光电技术有限公司 | 背光源、显示基板及显示装置 |
JP2023028364A (ja) * | 2021-08-19 | 2023-03-03 | 株式会社ジャパンディスプレイ | 照明装置 |
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Also Published As
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CN102239360A (zh) | 2011-11-09 |
US20110211141A1 (en) | 2011-09-01 |
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