JP2010176872A - Illumination unit, electro-optical device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of an eye region, in which luminance becomes locally high, with a simple configuration in an illumination unit such as a backlight unit, for example, used in a liquid-crystal device. <P>SOLUTION: The illumination unit includes: a light source (210); a light-guide plate (310) including a light-incident side end part (315) having a light-incident end face (310a) into which light from the light source is made incident and a light-emitting face part (311) having a light-emitting face (311a) emitting the light made incident into the light-incident end face; an adhesion layer (51a) closely arranged at least on a part of the face on the light-emitting face side of a light-source facing part (312) facing the light source in the light-incident side end part so as to overlap with the part of the face when viewed from a normal direction of the light-emitting face; and a space (910) formed at least on a part of the face on the light-emitting face side of a light-source non-facing part (313), which excludes the light-source facing part of the light-incident end part and resides in a region overlapping with the part of the face when viewed from the normal direction of the light-emitting face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technical field of an illumination unit such as a backlight unit used in a liquid crystal device, an electro-optical device such as a liquid crystal device including such an illumination unit, and an electronic apparatus including such an electro-optical device.

  As this type of illumination unit, a backlight unit (or illumination device) that irradiates light onto a liquid crystal panel is known (see, for example, Patent Documents 1 and 2). This type of lighting unit typically includes a light source such as an LED (Light Emitting Diode), and a light guide plate that irradiates the liquid crystal panel with light emitted from the light source as planar light. . One or a plurality of light sources are provided to face the side surface of the light guide plate. The light incident on the light guide plate from the light source is repeatedly reflected between the light exit surface (upper side surface) and the light reflection surface (lower side surface) of the light guide plate, and then exits from the light exit surface.

  In such an illumination unit, for example, it is more difficult to reduce the thickness of a light source such as an LED than to reduce the thickness of the light guide plate, and thus it is difficult to reduce the thickness of the entire illumination unit. Therefore, in order to reduce the thickness of the entire lighting unit, for example, as disclosed in Patent Document 2, the light emission surface portion of the light guide plate (that is, the portion where the light emission surface is formed) is more than the end portion on the light source side. In some cases, a slope is formed at the end portion on the light source side so that the thickness of the end portion on the light source side gradually decreases from the light source side toward the light emitting surface portion side.

JP 2006-164530 A JP 2007-141596 A

  However, this type of illumination unit has a technical problem in that the brightness of the portion near the light source on the light exit surface of the light guide plate may locally increase. Such a region where the brightness is locally increased typically has a shape close to a circle, and may be referred to as a “eyeball region” or a “hot spot”. Hereinafter, in this specification, such a region where the luminance is locally increased is appropriately referred to as an “eyeball region”.

  Further, as described above, when the slope is formed at the end portion on the light source side, the eyeball region may be easily generated due to the light incident from the light source being reflected on the slope. In order to reduce the occurrence of the eyeball region, for example, it is conceivable to increase the distance between the light source and the light exit surface portion of the light guide plate to make the slope of the slope at the end on the light source side gentle. In such a case, there may arise a technical problem that the planar size of the illumination unit is increased or the luminance on the light exit surface of the light guide plate is decreased.

  The present invention has been made in view of the above-described problems, for example. An illumination unit capable of suppressing the generation of a center area in which brightness is locally increased with a simple configuration, and an electro-optical device including such an illumination unit It is another object of the present invention to provide an electronic apparatus including such an electro-optical device.

  In order to solve the above problems, an illumination unit of the present invention is adjacent to the light incident side end and the light incident side end having a light incident end surface on which light from the light source is incident and the light incident side. A light exit surface portion having a light exit surface that emits light incident on the light end surface; and a light exit surface side surface of a light source facing portion facing the light source in the light incident side end portion An adhesive layer disposed in close contact with at least a part of the light exit surface when viewed from the normal direction of the light emitting surface, and the light in the light source non-opposing portion excluding the light source facing portion of the light incident side end portion A space formed in a region overlapping at least part of the surface on the exit surface side when viewed from the normal direction of the light exit surface.

  The illumination unit of the present invention is used as a backlight unit that irradiates light to an electro-optical panel such as a liquid crystal panel. During operation of the illumination unit of the present invention, light is incident on a light incident end surface that is one side surface of the light guide plate from a light source such as an LED, and the incident light is converted into planar light from the light exit surface of the light guide plate. Emitted. Thereby, it becomes possible to irradiate light to the electro-optical panel arranged to face the light emitting surface of the light guide plate. One or more light sources are mounted on a mounting substrate such as a flexible substrate connected to the electro-optical panel. The light source is disposed on the light incident end surface side of the light guide plate so that the light emitting surface faces the light incident end surface of the light guide plate.

  In the present invention, in particular, the light guide plate is in close contact with at least a part of the light exit surface side surface of the light source facing portion facing the light source so as to overlap the light exit surface when viewed from the normal direction of the light exit surface. An arranged adhesion layer is provided. The adhesion layer is configured to include, for example, an adhesive or an adhesive material, and the light emitting surface side surface of the light source facing portion (that is, the upper surface of the light source facing portion, that is, the light of the two plate surfaces of the light guide plate). It is in close contact with all or part of the surface on the side where the emission surface is formed. Furthermore, a space formed in a region that overlaps at least a part of the light exit surface side surface of the light entrance non-opposing portion excluding the light source facing portion of the light incident side end portion of the light guide plate when viewed from the normal direction of the light exit surface. have. Therefore, at least a part of the light exit surface side of the light source non-opposing portion excluding the light source facing portion in the light incident side end of the light guide plate is in contact with the space. For example, the film is disposed on all or a part of the upper surface of the light source non-opposing portion of the light incident side end of the light guide plate, for example, an air layer between the light source non-opposing portion and the film. Formed as. Such a film may be formed as a part of an optical sheet or a flexible substrate, for example, or may be provided alone to form a space.

  Therefore, the reflectance from which the light incident on the light incident side end portion from the light source is reflected from the light emitting surface side surface (for example, the upper side surface formed as an inclined surface) in the light source facing portion of the light incident side end portion from the light source. The light incident on the light incident side end portion can be made smaller than the reflectance reflected by the light exit surface side surface (for example, the upper side surface formed as an inclined surface) in the light source non-opposing portion of the light incident side end portion. . That is, according to the present invention, since the adhesion layer is in close contact with at least a part of the light emitting surface side surface of the light source facing part and the space is in contact with at least a part of the light source non-opposing part, the light source has a relatively strong strength. For the light source facing portion where light is incident, the reflectance at which light is reflected on the surface can be made relatively small, and for the light source non-facing portion where light is incident with a relatively weak intensity from the light source, The reflectance at which light is reflected on the surface can be relatively increased.

  Therefore, the light incident from the light source is reflected on the light exit surface side of the light incident side end (for example, the upper side surface formed as an inclined surface), resulting in local brightness on the light exit surface. It is possible to suppress or prevent the generation of a high eyeball area. Thereby, generation | occurrence | production of the brightness nonuniformity in a light-projection surface can be suppressed or prevented. Furthermore, according to the present invention, the adhesion layer is in close contact with at least a part of the light source facing part, and a space is in contact with at least a part of the light source non-opposing part. Since it can be suppressed or prevented, it is very advantageous in practice. For example, according to the present invention, the design period for designing the illumination unit can be shortened or the illumination unit can be manufactured as compared with the case where the generation of the eyeball region is suppressed by changing the shape of the light guide plate. It is also possible to reduce the manufacturing cost. In addition, according to the present invention, it is possible to avoid a situation in which the planar size of the illumination unit is increased or the luminance on the light exit surface of the light guide plate is decreased.

  As described above, according to the illumination unit of the present invention, it is possible to suppress or prevent the eyeball region where the brightness is locally increased from occurring on the light exit surface with a simple configuration.

  In one aspect of the lighting unit of the present invention, the adhesion layer includes a light shielding material.

  According to this aspect, light from the outside (for example, direct light from the light source or light directed to the light source facing portion when the light emitted from the light guide plate is reflected by the other member) passes through the adhesion layer. Thus, it is possible to reduce or prevent the light from entering the light source facing portion. Therefore, generation | occurrence | production of the eyeball area | region in a light-projection surface can be suppressed or prevented more reliably.

  In another aspect of the illumination unit of the present invention, the light source non-opposing portion is disposed so as to overlap at least a part of the light emitting surface side surface as viewed from the normal direction of the light emitting surface, and the space is air. An air layer forming film for forming a layer is provided.

  According to this aspect, since an air layer can be formed as a space between the air layer forming film and the light source non-opposing portion, the air layer can be in contact with at least a part of the light source non-opposing portion. Yes. Therefore, the reflectance at the surface of the light source non-opposing portion can be increased, and the generation of the eyeball region on the light exit surface can be more reliably suppressed or prevented.

  In the aspect including the air layer forming film described above, a main body portion formed to cover the light emission surface, and at least a part of the light emission surface side surface of the light source non-opposing portion from the main body portion. And an optical sheet having an extended portion extended as the air layer forming film.

  In this case, for example, an air layer can be formed between the extension portion of the optical sheet such as a diffusion sheet or a prism sheet and the light source non-opposing portion. It is possible to ensure contact. Furthermore, in this case, a simpler configuration can be achieved as compared with the case where the air layer forming film is provided separately from the optical sheet.

  In the aspect including the air layer forming film described above, the first optical sheet formed to cover the light emitting surface, and the light emitting surface to cover the light emitting surface and more than the first optical sheet. A second optical sheet formed on a near side, and the second optical sheet includes a main body formed to cover the light emitting surface, and the light emitting surface of the light source non-facing portion from the main body. And an extending portion that extends as the air layer forming film on at least a part of the side surface.

  In this case, since an air layer can be formed between the extending portion of the second optical sheet and the light source non-opposing portion, the air layer is formed on at least a part of the light emitting surface side surface of the light source non-opposing portion. Can be surely touched.

  Furthermore, for example, a part of the light-shielding tape provided so as to cover the extending portion of the second optical sheet can be securely adhered to the light source facing portion on both sides of the extending portion of the second optical sheet as an adhesion layer. it can. That is, if only the first optical sheet, which is the optical sheet far from the surface of the light guide plate, of the first and second optical sheets has an extending portion that forms an air layer, the first optical sheet Since the extended part of the light source is relatively far from the surface of the light source non-facing part, even if the light shielding tape is partly adhered to the light source facing part on both sides of the extending part of the first optical sheet as an adhesion layer, There is a risk of peeling due to the reaction force from the first optical sheet. However, according to this aspect, since the second optical sheet, which is the optical sheet closer to the surface of the light guide plate, of the first and second optical sheets has the extending portion, a part of the light shielding tape is used as the adhesion layer. 2 When the two optical sheets are closely attached to the light source facing part on both sides, it is almost or practically that a part of the light shielding tape is peeled off from the light source facing part due to the reaction force from the second optical sheet. Not at all.

  In the aspect provided with the air layer forming film described above, the light shielding tape disposed so as to overlap the light incident side end portion, and a portion of the light shielding tape overlapping the surface on the light emitting surface side of the light source facing portion At least a portion of the light-shielding tape that is in close contact with the light-emitting surface side surface of the light-source facing portion and at least one of the portions that overlap the light-emitting surface-side surface of the light source non-facing portion. The air layer forming film may be interposed between the portion and the light exit surface side surface of the light source non-facing portion.

  In this case, a simpler configuration can be achieved as compared with the case where the adhesion layer is provided separately from the light shielding tape. The light shielding tape is a double-sided tape having a light shielding property and is typically formed in a rectangular frame shape and defines a frame of an effective display area of the electro-optical panel.

  In the aspect including the optical sheet described above, the optical sheet may have a planar shape in which a portion adjacent to the light source is concavely recessed with respect to the light source when viewed from the normal direction of the light emitting surface. Good.

  In this case, the portion of the optical sheet that overlaps the light source non-opposing portion can function as an air layer forming film, and the adhesion layer can be securely adhered to the light source facing portion. Furthermore, it is also possible to improve the uniformity of luminance on the light exit surface by adjusting the amount (or area) of the optical sheet that is recessed in the planar shape.

  In the aspect including the air layer forming film described above, the light source is mounted on a flexible substrate, and the flexible substrate has the light on at least a part of the light emitting surface side surface of the light source non-facing portion. The air layer forming portion is disposed as the air layer forming film so as to overlap when viewed from the normal direction of the emission surface.

  In this case, a simpler configuration can be achieved as compared with the case where the air layer forming film is provided separately from the flexible substrate. The flexible substrate on which the light source is mounted may be connected to, for example, an electro-optical panel (in other words, may be formed integrally with a flexible substrate connected to the electro-optical panel), or may be connected to the electro-optical panel. It may be provided separately from the connected flexible substrate.

  In order to solve the above problems, an electro-optical device of the present invention includes the above-described illumination unit of the present invention (including various aspects thereof) and an electro-optical panel irradiated with light by the illumination unit, The electro-optical panel is disposed such that an effective display area of the electro-optical panel overlaps at least a part of the light emitting surface portion and does not overlap the light incident side end portion.

  Since the above-described illumination unit of the present invention is provided, a high-quality image with little luminance unevenness can be displayed, for example. In particular, according to the present invention, the effective area of the electro-optical panel overlaps at least a part of the light exit surface of the light guide plate included in the illumination unit and does not overlap the light incident side end of the light guide plate. It is possible to reliably irradiate the effective area of the electro-optical panel with the light emitted from the light emission surface, and to more reliably reduce or prevent the occurrence of luminance unevenness in the effective area of the electro-optical panel.

  In order to solve the above-described problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention (including various aspects thereof).

  According to the electronic apparatus of the present invention, since the electro-optical device of the present invention described above is included, for example, a projection display device, a television, a mobile phone, and an electronic notebook capable of displaying a high-quality image with little luminance unevenness. Various electronic devices such as a word processor, a viewfinder type or a monitor direct-view type video tape recorder, a workstation, a videophone, a POS terminal, and a touch panel can be realized. In addition, as an electronic apparatus of the present invention, for example, an electrophoretic device such as electronic paper, an electron emission device (Field Emission Display and Conduction Electron-Emitter Display), and a display device using these electrophoretic device and electron emission device Is also possible.

  The operation and other advantages of the present invention will become apparent from the best mode for carrying out the invention described below.

It is a disassembled perspective view which shows the whole structure of the liquid crystal device which concerns on 1st Embodiment. It is sectional drawing which shows the whole structure of the liquid crystal device which concerns on 1st Embodiment. It is a top view which shows the light-guide plate which concerns on 1st Embodiment. It is a top view which shows the planar shape of the light shielding tape and diffusion sheet which concern on 1st Embodiment. FIG. 5 is a sectional view taken along line B-B ′ of FIG. 4. FIG. 5 is a sectional view taken along line C-C ′ of FIG. 4. It is an enlarged view which expands and shows the part R1 enclosed with the broken line in FIG. It is a top view which shows the planar shape of the reflective sheet which concerns on 1st Embodiment. It is a top view which shows the flexible substrate by which the light source was mounted, a light-guide plate, and an adhesion layer based on 1st Embodiment. FIG. 10 is a sectional view taken along line D-D ′ in FIG. 9. FIG. 10 is a cross-sectional view taken along line E-E ′ of FIG. 9. 1 is a perspective view showing a configuration of a personal computer as an example of an electronic apparatus to which an electro-optical device according to the invention is applied. 1 is a perspective view showing a configuration of a mobile phone as an example of an electronic apparatus to which an electro-optical device according to the invention is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a liquid crystal device is taken as an example of an electro-optical device to which the illumination unit of the present invention is applied.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.

  First, the overall configuration of the liquid crystal device according to the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is an exploded perspective view showing the overall configuration of the liquid crystal device according to the first embodiment, and FIG. 2 is a cross-sectional view showing the overall configuration of the liquid crystal device according to the first embodiment. 2 is a cross-sectional view in a state where the liquid crystal device according to the present embodiment shown in FIG. 1 is assembled, and is a cross-sectional view taken along the line Y in FIG. Further, in FIGS. 1 and 2, the scales are different for each member and each part for convenience of explanation. The same applies to FIGS. 3 to 8.

  1 and 2, the liquid crystal device according to the present embodiment is used as a liquid crystal panel 110 as an example of an “electro-optical panel” according to the present invention, and a backlight unit that irradiates light to the liquid crystal panel 110. The lighting unit 510 is provided. The illumination unit 510 includes a light guide plate 310, a diffusion sheet 61, a prism sheet 62, and a reflection sheet 71. The liquid crystal panel 110 and the illumination unit 510 are bonded to each other by a light shielding tape 51 that is a double-sided tape.

  The liquid crystal panel 110 is an active matrix drive type display panel in which a liquid crystal element is driven by a switching element such as a TFT (Thin Film Transistor), and an image is displayed in the image display area 10a as an example of the “effective display area” according to the present invention. Can be displayed.

  As shown in FIG. 2, the liquid crystal panel 110 includes a transmissive liquid crystal having a structure in which a liquid crystal layer 40 is sandwiched between a first substrate 10 and a second substrate 20, each formed of a translucent material such as glass. It is configured as a panel. The first substrate 10 and the second substrate 20 are bonded together by a frame-shaped sealing material 30. A liquid crystal layer 40 is provided in a region defined by the frame-shaped sealing material 30. In the present invention, the liquid crystal panel 110 is not limited to a specific configuration, and can adopt various known configurations.

  1 and 2, an FPC (Flexible Printed Circuit) substrate 150 that is a flexible substrate is connected to the liquid crystal panel 110. The FPC board 150 is an example of the “flexible board” according to the present invention. A plurality of light source sections 210 including LEDs are provided on the FPC board 150. Further, various wirings and various circuits (all not shown) for driving the light source unit 210 and the liquid crystal panel 110 are provided on the FPC board 150.

  As shown in FIG. 2, the first substrate 10 has a protruding portion 10 e that protrudes outward from one end of the second substrate 20. One end side of the FPC 150 is connected to the liquid crystal panel 110 at the protruding portion 10e.

  The light source unit 210 has a configuration in which a light emitting unit 212 made of an LED element is enclosed in a package (or case unit) 211, and functions as a light source that makes light incident on the light guide plate 310. The light source unit 210 is disposed on the light incident end surface 310 a side of the light guide plate 310 so that the light emitting surface 210 a that emits light faces the light incident end surface 310 a that is one side surface of the light guide plate 310. During operation of the liquid crystal device according to the present embodiment, light from the light source unit 210 is incident on the light incident end surface 310 a of the light guide plate 310.

  1 and 2, the light guide plate 310 is made of a translucent material, and light from the light source unit 210 incident on the light incident end surface 310a is converted into a light emitting surface on the side where the liquid crystal panel 110 is disposed. It functions as a light guide that exits from 311 a and leads to the liquid crystal panel 110. The light incident on the light guide plate 310 from the light source unit 210 is typically reflected repeatedly between the light emitting surface 311a and the light reflecting surface 310r (see FIG. 2) opposite to the light emitting surface 311a. After that, the light exits from the light exit surface 311a.

  FIG. 3 is a plan view showing the light guide plate according to the present embodiment together with the light source unit.

  1 and 3, the light guide plate 310 includes a main body portion 311 having a light emitting surface 311 a and a light incident side end portion 315 adjacent to the main body portion 311.

  The main body portion 311 is an example of a “light emitting surface portion” according to the present invention, and is a portion of the light guide plate 310 where the light emitting surface 311a is formed. The main body 311 has a flat plate shape. The main body 311 has a predetermined thickness that is thinner than the thickness of the light source unit 210.

  The light incident side end 315 is a part of the light guide plate 310 that is located on the side where the light source unit 210 is disposed with respect to the main body 311 and has a light incident end surface 310a. The light incident side end portion 315 is formed so as to be gradually thinner from the light source unit 210 side toward the main body unit 311 side, and its upper side surface (light emitting surface side) 315b (see FIG. 2) is the light emitting surface. It is formed as a slope inclined with respect to 311a.

  As shown in FIG. 3, the light incident side end portion 315 includes a light source facing portion 312 and a light source non-facing portion 313. The light source facing portion 312 is a portion facing the light source portion 210 in the light incident side end portion 315. The light source non-facing portion 313 is a portion of the light incident side end portion 315 excluding the light source facing portion 312, in other words, a portion of the light incident side end portion 315 that does not face the light source portion 210. The upper side surface 315b of the light incident side end 315 includes an upper side surface 312b (see FIG. 5) of the light source facing portion 312 and an upper side surface 313b (see FIG. 6) of the light source non-facing portion 313.

  In FIGS. 1 and 2 again, the light shielding tape 51 is a double-sided tape having a light shielding property formed in a rectangular frame shape, and the light shielding tape 51 defines the frame of the image display area 10 a of the liquid crystal panel 110. The light shielding tape 51 includes a light shielding material. As will be described later with reference to FIG. 5, a part of the light shielding tape 51 is provided so as to be in close contact with the upper side surface 312 b of the light source facing portion 312 of the light incident side end portion 315.

  The diffusion sheet 61 is an example of the “optical sheet” or “second optical sheet” according to the present invention, and is formed so as to substantially cover the light emitting surface 311 a of the light guide plate 310. The light emitted from 311a is diffused. As will be described later with reference to FIG. 4, the diffusion sheet 61 includes a main body 61 a formed so as to cover the light emitting surface 311 a, and at least a part of the light source non-facing portion 313 from the main body 61. It has the extended part 61b extended. The diffusion sheet 61 has a concave portion 61c (see FIG. 1) in which a portion adjacent to the light source portion 210 is recessed with respect to the light source portion 210 when viewed from the normal direction of the light emitting surface 311a (that is, the Z direction in FIG. 1). 1).

  The prism sheet 62 is an example of the “first optical sheet” according to the present invention, and is provided so as to overlap the diffusion sheet 61 (more precisely, the main body 61a of the diffusion sheet 61 (see FIG. 5)). The light diffused by the diffusion sheet 61 is collected and emitted to the liquid crystal panel 110 side.

  The reflection sheet 71 is disposed on the opposite side of the light guide plate 310 from the liquid crystal panel 110 so as to face the light reflection surface 310 r of the light guide plate 310. The reflection sheet 71 reflects the light emitted from the light reflection surface 310 r of the light guide plate 310 and returns it to the inside of the light guide plate 310. As will be described later with reference to FIG. 8, the reflection sheet 71 includes a main body 71a formed so as to overlap the light emission surface 311a when viewed from the normal direction of the light emission surface 311a, and the main body portion 71a. To the light source non-opposing portion 313 so as to overlap with at least part of the light source non-opposing portion 313. The reflection sheet 71 has a concave portion 71c (see FIG. 1) in which a portion adjacent to the light source unit 210 is recessed in the light source unit 210 when viewed from the normal direction of the light emitting surface 311a.

  The liquid crystal panel 110 and the illumination unit 510 are accommodated in a case or frame (not shown) so that the image display area 10a is exposed.

  Next, specific configurations of the light shielding tape and the diffusion sheet according to the present embodiment will be described in detail with reference to FIGS. 4 to 7 in addition to FIGS.

  FIG. 4 is a plan view showing a planar shape of the light shielding tape and diffusion sheet according to the present embodiment. FIG. 5 is a cross-sectional view taken along line B-B ′ of FIG. 4. FIG. 6 is a cross-sectional view taken along line C-C ′ of FIG. 4. FIG. 7 is an enlarged view showing a portion R1 surrounded by a broken line in FIG.

As shown in FIG. 4, the diffusion sheet 61 includes a main body 61a formed so as to cover the light emitting surface 311a, and an extension extending from the main body 61 on at least a part of the light source non-opposing portion 313. Part 61b. The diffusion sheet 61 has a concave portion 61 c in which a portion facing the light source portion 210 is recessed in a concave shape with respect to the light source portion 210 when viewed from the normal direction of the light emitting surface 311 a. The recess 61c is formed so as to include the optical axis L of the light source unit 210. In FIGS. 4 to 6, the light shielding tape 51 is formed so as to cover the extended portion 61b and the recess 61c of the diffusion sheet 61. And a portion 51b (see FIG. 6) disposed on the extending portion 61b, and a close contact portion 51a (see FIG. 5) in close contact with the upper side surface 312b of the light source facing portion 312 in the recess 61c. In other words, in the present embodiment, the light shielding tape 51 is not in close contact with the upper surface 313b of the light source non-opposing portion 313 in the portion overlapping the light incident side end portion 315 of the light guide plate 310 (that is, the light shielding tape 51 and the light source). The extended portion 61b of the diffusion sheet 61 is interposed between the non-opposing portion 313) and is in close contact with at least a part of the upper side surface 312b of the light source facing portion 312. The contact portion 51a of the light shielding tape 51 is an example of the “contact layer” according to the present invention, and the extending portion 61b of the diffusion sheet 61 is an example of the “air layer forming film” according to the present invention.

  Here, as shown in FIG. 7, the extension portion 61 b of the diffusion sheet 61 does not adhere to the light guide plate 310 unlike the light shielding tape 51, and therefore, the extension portion 61 b of the diffusion sheet 61 and the light incident side end portion 315. An air layer 910 as an example of a “space” according to the present invention is formed between the light source non-facing portion 313. In other words, in the present embodiment, the extending portion 61b of the diffusion sheet 61 is provided on the light source non-facing portion 313, so that an air layer 910 that contacts at least a part of the upper side surface 313b of the light source non-facing portion 313 is formed. ing.

  Thus, in FIGS. 4 to 7, in the present embodiment, in particular, in the light incident side end portion 315, the contact portion 51 a of the light shielding tape 51 that is in close contact with at least a part of the upper side surface 312 b of the light source facing portion 312 (FIG. 5). An air layer 910 (see FIG. 7) that is in contact with at least a part of the upper side surface 313 b of the light source non-opposing portion 313 in the light incident side end portion 315 is formed by the extending portion 61 b of the diffusion sheet 61. ing.

  Therefore, the reflectance at which the light incident on the light incident side end 315 from the light source unit 210 is reflected by the upper side surface 312b of the light source facing portion 312 of the light incident side end 315 is reflected from the light source unit 210 on the light incident side end 315. Can be made smaller than the reflectance at which the light incident on the upper side surface 313b of the light source non-opposing portion 313 of the light incident side end 315 is reflected. In other words, according to the present embodiment, the light-contacting sheet 51 is closely attached to at least a part of the light source facing part 312, and the air layer 910 is in contact with at least part of the light source non-facing part 313. For the light source facing portion 312 where light is incident with a relatively strong intensity, the reflectance at which the light is reflected by the upper side surface 312b can be made relatively small, and the light from the light source section 210 can be relatively weak. As for the light source non-opposing portion where the light is incident, the reflectance at which the light is reflected by the upper side surface 313b can be relatively increased.

  Therefore, the light incident from the light source unit 210 is reflected on the upper side surface 315b (that is, the upper side surfaces 312b and 313b) formed as the inclined surface of the light incident side end portion 315, thereby causing the light emission surface 311a to be reflected. It can suppress that the eyeball area | region where a brightness | luminance becomes high locally generate | occur | produces. Thereby, generation | occurrence | production of the brightness nonuniformity in the light-projection surface 311a can be suppressed. Furthermore, according to the present embodiment, the contact portion 51a of the light shielding tape 51 is in close contact with at least a part of the light source facing portion 312 and the air layer 910 formed by the extending portion 61b of the diffusion sheet 61 is the light source non-facing portion. Since it is possible to suppress the generation of the eyeball region on the light exit surface 311a with a simple configuration of contacting at least part of 313, it is very advantageous in practice. For example, according to the present embodiment, the design period for designing the illumination unit 510 can be shortened or the illumination unit 510 can be compared with a case where the shape of the light guide plate 310 is changed to suppress the generation of the eyeball region. It is also possible to reduce the manufacturing cost of manufacturing the. In addition, according to the present embodiment, it is possible to avoid a situation in which the planar size of the illumination unit 510 becomes large or the luminance on the light exit surface 311a of the light guide plate 310 decreases. As a result, the liquid crystal device according to the present embodiment can display a high-quality image with little luminance unevenness.

  In the present embodiment, in particular, since the contact portion 51a of the light shielding tape 51 including the light shielding material is in close contact with at least a part of the light source facing portion 312, light from the outside (for example, direct light from the light source unit 120, The light emitted from the light guide plate 310 is reflected by another member, so that the light traveling toward the light source facing portion 312 can be reduced from being incident on the light source facing portion 312 via the contact portion 51a.

  Further, in the present embodiment, in particular, as described above, the air layer 910 in contact with at least a part of the upper surface 313b of the light source non-opposing portion 313 in the light incident side end portion 315 is formed by the extending portion 61b of the diffusion sheet 61. Is formed. Therefore, compared with the case where the film for forming the air layer 910 is provided separately from the diffusion sheet 61, it can be set as a simpler structure.

  In addition, in this embodiment, in particular, the diffusion sheet 61 that is an optical sheet provided on the side close to the light emitting surface 311 a of the diffusion sheet 61 and the prism sheet 62 is provided on at least a part of the light source non-facing portion 313. The extended portion 61b is provided. Therefore, the close contact part 51a which is a part of the light shielding tape 51 provided so as to cover the extension part 61b of the diffusion sheet 61 is securely attached to the light source facing part 312 on both sides of the extension part 61b of the diffusion sheet 61. be able to. That is, if only the prism sheet 62, which is the optical sheet far from the light exit surface 311a of the light guide plate 310 among the diffusion sheet 61 and the prism sheet 62, has an extending portion for forming an air layer. Since the extending portion of the prism sheet 62 is relatively far from the surface of the light source non-facing portion 313, a part of the light shielding tape 51 is brought into close contact with the light source facing portion 312 on both sides of the extending portion of the prism sheet 62. However, the reaction force from the prism sheet 62 may cause peeling. However, according to the present embodiment, the diffusion sheet 61 that is the optical sheet closer to the light emitting surface 311a of the light guide plate 310 among the diffusion sheet 61 and the prism sheet 62 has the extending portion 61b. The contact portion 51a, which is a portion, hardly peels off from the light source facing portion 312 due to the reaction force from the diffusion sheet 61 or hardly in practice.

  The prism sheet 62 may be extended on at least a part of the light source non-facing portion 313 so as to form an air layer 910 in contact with at least a part of the upper side surface 313b of the light source non-facing portion 313.

  In FIG. 4, in particular, in the present embodiment, as described above, the diffusion sheet 61 has a concave portion with respect to the light source unit 210, as viewed from the normal direction of the light emitting surface 311 a. It has the recessed part 61c which becomes. Therefore, by adjusting the size of the concave portion 61c (that is, the amount or area of the concave portion), it is possible to improve the uniformity of luminance on the light emitting surface 311a. In the present embodiment, the concave portion 61c is configured to have a semicircular shape. However, the shape of the concave portion 61c is the light intensity and characteristics of the light source unit 210, the number of the light source units 210, or between adjacent light source units 210. What is necessary is just to determine suitably according to the space | interval of. The recess 61c may have a polygonal shape such as a triangular shape.

  Next, a specific configuration of the reflection sheet according to the present embodiment will be described with reference to FIG. 8 in addition to FIGS.

  FIG. 8 is a plan view showing a planar shape of the reflection sheet according to the present embodiment.

  3 and 8, the reflecting sheet 71 includes a main body 71a formed so as to overlap the light emitting surface 311a when viewed from the normal direction of the light emitting surface 311a, and a light source non-opposing portion 313 from the main body 71a. And an extending portion 71b that extends so as to overlap at least a part of the. The reflection sheet 71 has a recess 71 c in which a portion adjacent to the light source unit 210 is recessed with respect to the light source unit 210 when viewed from the normal direction of the light emitting surface 311 a.

  Therefore, of the light emitted from the light guide plate 310 toward the reflection sheet 71, the amount of light reflected by the reflection sheet 71 and returning to the light source facing portion 312 is reflected by the reflection sheet 71 and returns to the light source non-facing portion 313. It can be less than the amount of light. Therefore, it can suppress more reliably that the eyeball area | region where a brightness | luminance becomes locally high generate | occur | produces on the light-projection surface 311a.

  1 to 3 again, particularly in the present embodiment, the image display region 10 a of the liquid crystal panel 110 overlaps at least a part of the main body 311 of the light guide plate 310 and overlaps the light incident side end portion 315 of the light guide plate 310. Therefore, the light emitted from the light emitting surface 311a of the light guide plate 310 can be reliably radiated to the image display area 10a of the liquid crystal panel 110, and luminance unevenness occurs in the image display area of the liquid crystal panel 110. This can be reduced or prevented.

  As described above, according to the present embodiment, it is possible to suppress the occurrence of the eyeball region where the luminance is locally increased on the light emitting surface 311a with a simple configuration.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIGS.

  FIG. 9 is a plan view showing a flexible substrate, a light guide plate, and an adhesive layer on which a light source is mounted according to the present embodiment. FIG. 10 is a cross-sectional view taken along the line D-D ′ of FIG. 9. FIG. 11 is a cross-sectional view taken along line E-E ′ of FIG. 9. 9 to 11, the same reference numerals are given to the same components as those according to the first embodiment shown in FIGS. 1 to 8, and description thereof will be omitted as appropriate.

  9 to 11, in the present embodiment, the FPC board 150 on which the light source unit 210 is mounted is formed so as to overlap a part of the upper side surface (light emitting surface side) of the light incident side end portion 315 of the light guide plate 310. In addition, an adhesive layer 155 is provided to bond the FPC board 150 and the light incident side end 315 to each other. The adhesive layer 155 is an example of the “adhesion layer” according to the present invention.

  More specifically, the FPC board 150 is formed so as to at least partially overlap both the light source facing portion 312 and the light source non-facing portion 313 of the light incident side end portion 315. Further, the adhesive layer 155 is formed of an adhesive material so as to overlap at least a part of the light source facing portion 312 and not to overlap the light source non-facing portion 313. The adhesive layer 155 is in close contact with the upper side surface 312b of the light source facing portion 312. On the other hand, the portion 150a of the FPC board 150 that overlaps the light source non-facing portion 313 does not adhere to the light source non-facing portion 313. Therefore, the portion 150a of the FPC board 150 that overlaps the light source non-facing portion 313 (see FIG. 11) An air layer 920 is formed between the non-opposing portion 313. In other words, in the present embodiment, the air layer 920 in contact with at least a part of the upper side surface 313b of the light source non-facing portion 313 is provided by providing the portion 150a that is a part of the FPC board 150 on the light source non-facing portion 313. Is formed. The portion 150a of the FPC 150 that overlaps the light source non-facing portion 133 is an example of the “air layer forming film” according to the present invention.

  Thus, in FIGS. 9 to 11, in the present embodiment, in particular, the adhesive layer 155 that is in close contact with at least a part of the upper side surface 312 b of the light source facing portion 312 in the light incident side end 315 is provided, and the light incident An air layer 920 that is in contact with at least a part of the upper surface 313 b of the light source non-opposing portion 313 in the side end portion 315 is formed by a portion 150 a that is a part of the FPC board 150.

  Therefore, the reflectance at which the light incident from the light source unit 210 to the light incident side end 315 is reflected by the upper side surface 312b of the light source facing portion 312 of the light incident side end 315 is reflected from the light source unit 210 to the light incident side end 31. Can be made smaller than the reflectance at which the light incident on the upper side surface 313b of the light source non-opposing portion 313 of the light incident side end 315 is reflected. Therefore, it can suppress that the eyeball area | region where a brightness | luminance becomes locally high generate | occur | produces on the light-projection surface 311a.

<Electronic equipment>
Next, specific examples of electronic devices to which the liquid crystal devices according to the above-described embodiments can be applied will be described with reference to FIGS.

  First, an example in which the liquid crystal device according to each of the above-described embodiments is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 12 is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 1200 includes a main body 1204 including a keyboard 1202 and a display unit 1205 to which the liquid crystal device according to each of the above-described embodiments is applied.

  Subsequently, an example in which the liquid crystal device according to each embodiment described above is applied to a display unit of a mobile phone will be described. FIG. 13 is a perspective view showing the configuration of the mobile phone. As shown in the figure, the mobile phone 1300 includes a plurality of operation buttons 1302, a reception unit 1303, a transmission port 1304, and a display unit 1305 to which the liquid crystal device according to each embodiment described above is applied.

  In addition to the electronic apparatus described with reference to FIGS. 12 and 13, a projector, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor. , Workstations, videophones, POS terminals, devices equipped with touch panels, and the like. Needless to say, the present invention can be applied to these various electronic devices.

  In addition to the liquid crystal device described in the above embodiment, the present invention also includes a reflective liquid crystal device (LCOS) in which elements are formed on a silicon substrate, a plasma display (PDP), a field emission display (FED, SED), The present invention can also be applied to an organic EL display, a digital micromirror device (DMD), an electrophoresis apparatus, and the like.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. Electro-optical devices and electronic devices are also included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 10a ... Image display area 51 ... Light shielding tape 61 ... Diffusion sheet 61a ... Main part 61b ... Extension part 61c ... Recessed part 62 ... Prism sheet 71 ... Reflective sheet 71a ... Main part 71b ... Extension 150, FPC board, 155 ... Adhesive layer, 110 ... Liquid crystal panel, 210 ... Light source part, 310 ... Light guide plate, 310a ... Light incident end surface, 310r ... Light reflecting surface, 311 ... Main body part, 311a ... Light emitting surface, 312 ... Light source facing part, 313 ... Light source non-facing part, 315 ... Light incident side end part, 510 ... Illumination unit, 910, 920 ... Air layer

Claims (10)

A light source;
A light emitting side end portion having a light incident end surface on which light from the light source is incident, and a light emitting surface having a light emitting surface that is adjacent to the light incident side end portion and emits light incident on the light incident end surface. A light guide plate having a surface portion;
Adhesion arranged in close contact with at least a part of the light exit surface side of the light source facing portion of the light incident side end facing the light source so as to overlap when viewed from the normal direction of the light exit surface Layers,
A space formed in a region that overlaps at least a part of the light emitting surface side surface of the light incident non-opposing portion excluding the light source facing portion of the light incident side end portion when viewed from the normal direction of the light emitting surface; ,
A lighting unit comprising:   The lighting unit according to claim 1, wherein the adhesion layer includes a light shielding material.   An air layer forming film that is disposed so as to overlap at least a part of the light emitting surface side surface of the light source non-opposing portion when viewed from the normal direction of the light emitting surface, and forms an air layer as the space; The lighting unit according to claim 1, wherein the lighting unit is a lighting unit.   A main body formed so as to cover the light emitting surface, and an extension extending as the air layer forming film on at least a part of the light emitting surface side surface of the light source non-facing portion from the main body. The lighting unit according to claim 3, further comprising: an optical sheet having a mounting portion. A first optical sheet formed to cover the light exit surface;
A second optical sheet formed so as to cover the light emitting surface and closer to the light emitting surface than the first optical sheet;
The second optical sheet is for forming the air layer on a main body portion formed to cover the light emitting surface, and on at least a part of the light emitting surface side surface of the light source non-facing portion from the main body portion. The lighting unit according to claim 3, further comprising: an extending portion that extends as a film. A light-shielding tape disposed to overlap the light incident side end,
At least a portion of the light shielding tape that overlaps the light emitting surface side surface of the light source facing portion is in close contact with the light emitting surface side surface of the light source facing portion as the adhesion layer,
For forming the air layer between at least a part of the light shielding tape that overlaps the light emitting surface side surface of the light source non-facing portion and the light emitting surface side surface of the light source non-facing portion. The lighting unit according to claim 3, wherein a film is interposed.   5. The illumination unit according to claim 4, wherein the optical sheet has a planar shape in which a portion adjacent to the light source is recessed with respect to the light source when viewed from the normal direction of the light emitting surface. . The light source is mounted on a flexible substrate,
The flexible substrate is an air layer arranged as the air layer forming film so as to overlap at least a part of the light emitting surface side surface of the light source non-opposing portion when viewed from the normal direction of the light emitting surface. It has a formation part. The lighting unit as described in any one of Claim 3 to 7 characterized by the above-mentioned. The lighting unit according to any one of claims 1 to 8,
An electro-optical panel irradiated with light by the illumination unit,
The electro-optical device is arranged such that an effective display area of the electro-optical panel overlaps at least a part of the light emission surface portion and does not overlap the light incident side end portion.   An electronic apparatus comprising the electro-optical device according to claim 9.

Images