JP5821562B2 - Liquid crystal device, electronic device and lighting device - Google Patents

Liquid crystal device, electronic device and lighting device Download PDF

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JP5821562B2
JP5821562B2 JP2011253715A JP2011253715A JP5821562B2 JP 5821562 B2 JP5821562 B2 JP 5821562B2 JP 2011253715 A JP2011253715 A JP 2011253715A JP 2011253715 A JP2011253715 A JP 2011253715A JP 5821562 B2 JP5821562 B2 JP 5821562B2
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guide plate
light guide
light
liquid crystal
light emitting
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JP2013033193A (en
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百瀬　洋一
洋一 百瀬
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Seiko Epson Corp
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Seiko Epson Corp
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Priority to JP2011253715A priority Critical patent/JP5821562B2/en
Priority to US13/533,268 priority patent/US8755007B2/en
Priority to TW101122878A priority patent/TWI560496B/en
Priority to CN2012203163257U priority patent/CN203204270U/en
Priority to CN201210226521.XA priority patent/CN102854657B/en
Priority to KR1020120070503A priority patent/KR102015136B1/en
Publication of JP2013033193A publication Critical patent/JP2013033193A/en
Priority to US14/300,829 priority patent/US9360701B2/en
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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
    • 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
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Description

本発明は、照明装置および液晶パネルを備えた液晶装置、該液晶装置を備えた電子機器、および当該照明装置に関するものである。   The present invention relates to a lighting device and a liquid crystal device including a liquid crystal panel, an electronic apparatus including the liquid crystal device, and the lighting device.

各種の液晶装置のうち、透過型や半透過型の液晶パネルを備えた液晶装置は、いわゆるバックライト装置と称せられる照明装置と、この照明装置の光出射面の側に重ねて配置された液晶パネルとを有しており、照明装置から出射された照明光を液晶パネルで変調して画像を表示する。従って、照明装置においては、照明光の出射強度分布を均一とすることが必要である。   Among various liquid crystal devices, a liquid crystal device provided with a transmissive or transflective liquid crystal panel is a lighting device called a so-called backlight device, and a liquid crystal layered on the light emitting surface side of the lighting device. A panel, and modulates illumination light emitted from the illumination device with a liquid crystal panel to display an image. Therefore, in the illumination device, it is necessary to make the emission intensity distribution of illumination light uniform.

そこで、導光板の端部に発光素子を設けた照明装置において、導光板の第１方向で相対向する２つの辺に沿って複数の発光素子を設けるとともに、一方の辺に沿って配置された発光素子の位置と、他方の辺に沿って配置された発光素子の位置を第２方向でずらした構成が提案されている（特許文献１参照）。   Therefore, in the lighting device in which the light emitting element is provided at the end of the light guide plate, a plurality of light emitting elements are provided along two sides facing each other in the first direction of the light guide plate, and arranged along one side. A configuration in which the position of the light emitting element and the position of the light emitting element arranged along the other side are shifted in the second direction has been proposed (see Patent Document 1).

また、照明装置からの照明光の出射強度を領域毎に制御するにあたって、一体の導光板では光が広がり過ぎるとして、例えば、図１０（ａ）に示すように、第１方向に延在する長方形の導光板部８１Ｘを短辺方向である第２方向に複数、並列するとともに、導光板部８１Ｘの第１方向の端部（光入射部８８Ｘ）に発光素子８９を配置した構成が提案されている（特許文献２参照）。   Further, when controlling the emission intensity of the illumination light from the illumination device for each region, it is assumed that the light spreads too much in the integrated light guide plate. For example, as shown in FIG. 10A, a rectangle extending in the first direction is used. A plurality of light guide plate portions 81X are arranged in parallel in the second direction, which is the short side direction, and a light emitting element 89 is disposed at the end portion (light incident portion 88X) in the first direction of the light guide plate portion 81X. (See Patent Document 2).

一方、図１０（ｂ）に示すように、照明光の出射強度を領域毎に制御する構成ではないが、第１方向で対向する２辺の長さが相違する台形形状の複数の導光板部８２Ｙを第１方向における向きを逆にして第２方向に配列するとともに、導光板部８２Ｙの長辺側に位置する端面（光入射部８８Ｙ）に発光素子８９を配置した照明装置が提案されている（特許文献３参照）。   On the other hand, as shown in FIG. 10 (b), the light emission intensity of illumination light is not configured to be controlled for each region, but a plurality of trapezoidal light guide plate portions in which the lengths of two sides facing each other in the first direction are different. A lighting device is proposed in which 82Y is arranged in the second direction with the direction in the first direction reversed, and the light emitting element 89 is arranged on the end surface (light incident portion 88Y) located on the long side of the light guide plate portion 82Y. (See Patent Document 3).

特開２００６−１２０３６１号公報JP 2006-120361 A 特開２００９−１６３９０２号公報JP 2009-163902 A 特開２００６−１０８０４５号公報JP 2006-108045 A

しかしながら、特許文献２に記載の照明装置の場合、導光板部８１Ｘの光入射部８８Ｘの第２方向のサイズが発光素子８９の第２方向のサイズに比して大きい。このため、導光板部８１Ｘから照明光を出射した際、導光板部８１Ｘの光入射部８８Ｘ付近では、発光素子８９と対向している部分からの照明光の出射強度は大であるが、かかる領域から第２方向にずれた位置では、照明光の出射強度が低くなりやすいという問題点がある。また、特許文献３に記載の構成を採用した場合は、特許文献２に記載の照明装置よりさらに、導光板部８２Ｙの光入射部８８Ｙの第２方向のサイズが発光素子８９の第２方向のサイズに比して大きいため、上記の問題点が顕著である。   However, in the case of the illumination device described in Patent Document 2, the size of the light incident portion 88X of the light guide plate portion 81X in the second direction is larger than the size of the light emitting element 89 in the second direction. For this reason, when the illumination light is emitted from the light guide plate portion 81X, the emission intensity of the illumination light from the portion facing the light emitting element 89 is large in the vicinity of the light incident portion 88X of the light guide plate portion 81X. At a position shifted from the region in the second direction, there is a problem that the emission intensity of the illumination light tends to be low. When the configuration described in Patent Literature 3 is adopted, the size of the light incident portion 88Y of the light guide plate portion 82Y in the second direction is further in the second direction of the light emitting element 89 than the lighting device described in Patent Literature 2. Since the size is larger than the size, the above problem is remarkable.

それ故、特許文献２、３に記載の構成を採用する場合には、導光板部８１Ｘ、８２Ｙの第２方向の寸法を小さくするとともに、導光板部８１Ｘ、８２Ｙおよび発光素子８９の数を増やして、導光板部８１Ｘ、８２Ｙの第２方向のサイズを発光素子８９の第２方向のサイズに近づける必要があるが、かかる構成の場合、照明装置や液晶装置のコストが増大してしまう。また、特許文献２、３に記載の構成では、導光板部８１Ｘ、８２Ｙの光入射部８８Ｘ、８８Ｙから大きく離間した位置に発光素子８９を設けることにより、導光板部８１Ｘ、８２Ｙの光入射部８８Ｘ、８８Ｙ付近での照明光の出射強度差を小さくすることも考えられるが、かかる構成の場合、照明装置の第１方向における寸法が大となってしまい、液晶装置に搭載できなくなる等の問題点がある。   Therefore, when the configurations described in Patent Documents 2 and 3 are adopted, the size of the light guide plate portions 81X and 82Y in the second direction is reduced, and the number of the light guide plate portions 81X and 82Y and the light emitting elements 89 is increased. Thus, it is necessary to make the size of the light guide plate portions 81X and 82Y in the second direction close to the size of the light emitting element 89 in the second direction, but in such a configuration, the cost of the illumination device and the liquid crystal device increases. Further, in the configurations described in Patent Documents 2 and 3, the light incident portion of the light guide plate portions 81X and 82Y is provided by providing the light emitting element 89 at a position largely separated from the light incident portions 88X and 88Y of the light guide plate portions 81X and 82Y. Although it is conceivable to reduce the difference in the intensity of illumination light emitted in the vicinity of 88X and 88Y, in such a configuration, the size of the illumination device in the first direction becomes large and cannot be mounted on the liquid crystal device. There is a point.

以上の問題点に鑑みて、本発明の課題は、第１方向に延在する導光板部を第２方向に複数並列させた場合でも、導光板部や発光素子の数が比較的少なく、かつ、第１方向における寸法が比較的小さくても、照明光の出射強度の均一化を図ることのできる液晶装置、液晶装置を備えた電子機器、および当該照明装置を提供することにある。   In view of the above problems, the problem of the present invention is that even when a plurality of light guide plate portions extending in the first direction are arranged in parallel in the second direction, the number of light guide plate portions and light emitting elements is relatively small, and An object of the present invention is to provide a liquid crystal device, an electronic device provided with the liquid crystal device, and the illumination device capable of achieving uniform illumination light emission intensity even when the dimension in the first direction is relatively small.

上記課題を解決するために、本発明は、照明装置と、該照明装置の光出射面の側に重ねて配置された液晶パネルと、を有する液晶装置であって、前記照明装置は、前記光出射面の面内方向で互いに交差する第１方向および第２方向のうち、少なくとも前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺とを有する平面形状の導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、前記液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの前記照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、を有していることを特徴とする。   In order to solve the above-described problems, the present invention provides a liquid crystal device including a lighting device and a liquid crystal panel disposed on the light emitting surface side of the lighting device, the lighting device including the light Of the first direction and the second direction intersecting each other in the in-plane direction of the emission surface, the planar shape having at least a first side facing in the first direction and a second side longer than the length of the first side A light guide plate in which a plurality of light guide plate portions are arranged so that the first side and the second side are adjacent to each other in the second direction, and each of the plurality of light guide plate portions A plurality of light emitting elements for causing light source light to enter the light guide plate portion from the end face of the first side, and selectively driving the plurality of light emitting elements in conjunction with driving the liquid crystal panel, The amount of emitted light is controlled for each of the plurality of light guide plate portions. It characterized in that it has a light source driving unit.

本発明に係る液晶装置では、液晶パネルに対する駆動に連動して、照明装置からの照明光の出射強度を領域毎に制御するにあたって、第１方向で対向する２辺の長さが相違する平面形状をもつ導光板部を、第１方向における向きを逆にして第２方向に配列し、かかる導光板部において第１方向に位置する端面から導光板部内に発光素子から出射された光源光を入射させる。このため、一体の導光板を用いた場合と違って光源光が広がり過ぎることを抑制することができるので、照明光の出射強度を領域毎に好適に制御することができる。ここで、発光素子は、導光板部の第１方向で対向する２辺のうち、第１辺側（短辺側）に位置する端面から導光板部内に光源光を入射させる。このため、導光板部においては、光源光が入射する端面（光入射部）の第２方向のサイズが発光素子の第２方向のサイズに比して過剰に大きくなるという事態を回避することができる。従って、導光板部の光入射部から発光素子を過度に第１方向に離間させなくても、導光板部において発光素子と対向している部分と、かかる領域から第２方向にずれた位置とにおける光源光の入射光量の差が小さい。それ故、導光板部から照明光を出射した際、導光板部の光入射部付近において、発光素子と対向している部分からの照明光の出射強度と、かかる領域から第２方向にずれた位置からの照明光の出射強度との差が小さい。よって、第１方向に延在する導光板部を第２方向に複数並列させた場合でも、導光板部や発光素子の数が比較的少なく、かつ、第１方向における寸法が比較的小さくても、照明光の出射強度の均一化を図ることができる。   In the liquid crystal device according to the present invention, in controlling the emission intensity of the illumination light from the illumination device for each region in conjunction with the driving of the liquid crystal panel, the planar shape in which the lengths of the two sides facing each other in the first direction are different. Are arranged in the second direction with the direction in the first direction reversed, and the light source light emitted from the light emitting element is incident on the light guide plate portion from the end face located in the first direction in the light guide plate portion. Let For this reason, unlike the case where an integrated light guide plate is used, it is possible to prevent the light source light from spreading too much, so that the emission intensity of the illumination light can be suitably controlled for each region. Here, the light emitting element causes light source light to enter the light guide plate portion from an end surface located on the first side (short side) of the two sides facing each other in the first direction of the light guide plate portion. For this reason, in the light guide plate portion, it is possible to avoid a situation in which the size in the second direction of the end face (light incident portion) on which the light source light enters is excessively larger than the size in the second direction of the light emitting element. it can. Therefore, even if the light emitting element is not excessively separated from the light incident portion of the light guide plate portion in the first direction, the portion facing the light emitting element in the light guide plate portion and the position shifted from the region in the second direction The difference in the amount of incident light of the light source is small. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light emitting element in the vicinity of the light incident portion of the light guide plate portion is shifted in the second direction from the region. The difference with the emission intensity of the illumination light from the position is small. Therefore, even when a plurality of light guide plate portions extending in the first direction are arranged in parallel in the second direction, the number of light guide plate portions and light emitting elements is relatively small, and the size in the first direction is relatively small. The emission intensity of illumination light can be made uniform.

本発明において、前記導光板部は、前記第１辺と前記第２辺とが平行な台形の平面形状を有している構成を採用することができる。かかる構成によれば、導光板の第１方向の両側で発光素子が第２方向に直線的に並ぶ構成となるので、発光素子が実装された基板を直線的に延在させることができる等、構成の簡素化を図ることができる。   In the present invention, the light guide plate portion may have a trapezoidal planar shape in which the first side and the second side are parallel. According to such a configuration, since the light emitting elements are linearly arranged in the second direction on both sides in the first direction of the light guide plate, the substrate on which the light emitting elements are mounted can be linearly extended, etc. The configuration can be simplified.

本発明において、前記導光板部は、前記第１方向に延在して前記第１辺の一方の端部と前記第２辺の一方の端部とを結ぶ斜辺と、前記第１辺および前記第２辺に対して直交するように延在して前記第１辺の他方の端部と前記第２辺の他方の端部とを結ぶ側辺と、を備えている構成を採用することができる。かかる構成によれば、平行な２辺に対して直交する側辺が第２方向の外側に配置するように導光板部を配置することにより、導光板を長方形とすることができる。   In the present invention, the light guide plate portion includes a hypotenuse extending in the first direction and connecting one end of the first side and one end of the second side, the first side, and the first side. Adopting a configuration that includes a side that extends perpendicular to the second side and connects the other end of the first side and the other end of the second side. it can. According to such a configuration, the light guide plate can be made rectangular by arranging the light guide plate portion so that the sides orthogonal to the two parallel sides are arranged outside the second direction.

本発明において、複数の前記導光板部のうち、隣り合う導光板部の間には光散乱面が設けられていることが好ましい。かかる構成によれば、導光板部から隣りの導光板部に向けて一部の光が光散乱面を介して漏れるので、隣り合う導光板部の境界部分において照明光の出射強度が急激に変化することを防止することができる。   In the present invention, it is preferable that a light scattering surface is provided between adjacent light guide plate portions among the plurality of light guide plate portions. According to such a configuration, a part of light leaks from the light guide plate portion to the adjacent light guide plate portion through the light scattering surface, so that the emission intensity of the illumination light rapidly changes at the boundary portion between the adjacent light guide plate portions. Can be prevented.

本発明において、複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に前記光散乱面が設けられ、他の一部に反射面が設けられている構成を採用することができる。かかる構成によれば、光散乱面および反射面が占める割合を調整すれば、導光板部から隣りの導光板部に漏れる光量と、反射面で反射して導光板部に戻る光量を調整することができる。従って、隣り合う導光板部の境界部分において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部から出射される照明光の光量を最適化することができる。   In the present invention, among the light guide plate portions, between the adjacent light guide plate portions, the light scattering surface is provided in a part of the light guide plate portion in the thickness direction, and the other part is a reflective surface. A configuration in which is provided can be employed. According to this configuration, by adjusting the ratio of the light scattering surface and the reflection surface, the amount of light leaking from the light guide plate portion to the adjacent light guide plate portion and the amount of light reflected by the reflection surface and returning to the light guide plate portion can be adjusted. Can do. Therefore, it is possible to suppress a sudden change in the intensity of illumination light emitted at the boundary between adjacent light guide plate portions, and to optimize the amount of illumination light emitted from the light guide plate portion.

本発明において、複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に前記光散乱面が設けられ、他の一部には隙間が設けられている構成を採用してもよい。かかる構成によれば、導光板部の端面と隙間内の空気層との界面で反射が発生するとともに、一部の光は隙間を介して隣りの導光板部に入射する。従って、光散乱面および隙間が占める割合を調整すれば、導光板部から隣りの導光板部に漏れる光量と、導光板部の端面と隙間内の空気層との界面で反射して導光板部に戻る光量を調整することができる。それ故、隣り合う導光板部の境界部分において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部から出射される照明光の光量を最適化することができる。   In the present invention, among the light guide plate portions, between the adjacent light guide plate portions, the light scattering surface is provided in a part in the thickness direction of the light guide plate portion, and a gap is provided in the other part. A configuration in which is provided may be adopted. According to this configuration, reflection occurs at the interface between the end face of the light guide plate portion and the air layer in the gap, and a part of the light enters the adjacent light guide plate portion through the gap. Therefore, if the ratio of the light scattering surface and the gap is adjusted, the amount of light leaking from the light guide plate portion to the adjacent light guide plate portion and the light guide plate portion is reflected at the interface between the end surface of the light guide plate portion and the air layer in the gap. The amount of light returning to can be adjusted. Therefore, it is possible to suppress an abrupt change in the emission intensity of illumination light at the boundary portion between adjacent light guide plate portions, and to optimize the amount of illumination light emitted from the light guide plate portion.

本発明において、複数の前記導光板部のうち、隣り合う導光板部の間には、隙間が設けられている構成を採用してもよい。かかる構成によれば、導光板部の端面と隙間内の空気層との界面で反射が発生するとともに、一部の光は隙間を介して隣りの導光板部に入射する。従って、隣り合う導光板部の境界部分において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部から出射される照明光の光量を最適化することができる。   In this invention, you may employ | adopt the structure by which the clearance gap is provided between the adjacent light-guide plate parts among the said some light-guide plate parts. According to this configuration, reflection occurs at the interface between the end face of the light guide plate portion and the air layer in the gap, and a part of the light enters the adjacent light guide plate portion through the gap. Therefore, it is possible to suppress a sudden change in the intensity of illumination light emitted at the boundary between adjacent light guide plate portions, and to optimize the amount of illumination light emitted from the light guide plate portion.

本発明において、複数の前記導光板部は、厚さ寸法が前記第１方向で連続的に変化している構成を採用することができる。   In the present invention, the plurality of light guide plate portions may employ a configuration in which the thickness dimension is continuously changed in the first direction.

この場合、複数の前記導光板部は、厚さ寸法が前記第２辺の側から前記第１辺の側に向けて増大していることが好ましい。かかる構成によれば、入射した光源光が導光板部の先端側まで十分な光量をもって到達しやすいので、導光板部から出射される照明光の出射強度の均一化を図ることができる。   In this case, it is preferable that the thickness of the plurality of light guide plate portions increase from the second side toward the first side. According to such a configuration, the incident light source light easily reaches the tip side of the light guide plate portion with a sufficient amount of light, so that the emission intensity of the illumination light emitted from the light guide plate portion can be made uniform.

本発明において、複数の前記導光板部は、隣り合う導光板部のいずれにおいても、前記第１辺と前記第２辺とが隣り合うように配列されていることが好ましい。かかる構成によれば、導光板内での光源光の第１方向における進行方向が第２方向において交互になるので、導光板内での輝度ムラが発生しにくい等の利点がある。   In the present invention, the plurality of light guide plate portions are preferably arranged so that the first side and the second side are adjacent to each other in any of the adjacent light guide plate portions. According to this configuration, since the traveling direction of the light source light in the first direction in the light guide plate is alternated in the second direction, there is an advantage that luminance unevenness hardly occurs in the light guide plate.

本発明に係る液晶装置は各種電子機器において表示部として用いることができる。   The liquid crystal device according to the present invention can be used as a display unit in various electronic devices.

また、本発明に係る照明装置は、光出射面の面内方向で互いに交差する第１方向および第２方向のうち、少なくとも前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺とを有する平面形状の導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、前記液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの前記照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、を有していることを特徴とする。   Moreover, the illuminating device according to the present invention includes at least a first side facing in the first direction and a length of the first side among the first direction and the second direction intersecting each other in the in-plane direction of the light emitting surface. A light guide plate in which a plurality of planar light guide plate portions having long second sides are arranged so that the first side and the second side are adjacent to each other in the light guide plate portions adjacent in the second direction; In each of the plurality of light guide plate portions, a plurality of light emitting elements that allow light source light to enter the light guide plate portion from the end surface of the first side, and the plurality of light emitting elements are selectively operated in conjunction with driving the liquid crystal panel. And a light source driving unit that controls the amount of emitted light of the illumination light from the light emitting surface for each of the plurality of light guide plate units.

本発明に係る照明装置では、照明光の出射強度を領域毎に制御するにあたって、第１方向で対向する２辺の長さが相違する平面形状をもつ導光板部を、第１方向における向きを逆にして第２方向に配列し、かかる導光板部において第１方向に位置する端面から導光板部内に発光素子から出射された光源光を入射させる。このため、一体の導光板を用いた場合と違って光源光が広がり過ぎることを抑制することができるので、照明光の出射強度を領域毎に好適に制御することができる。ここで、発光素子は、導光板部の第１方向で対向する２辺のうち、第１辺側（短辺側）に位置する端面から導光板部内に光源光を入射させる。このため、導光板部においては、光源光が入射する端面（光入射部）の第２方向のサイズが発光素子の第２方向のサイズに比して過剰に大きくなるという事態を回避することができる。従って、導光板部の光入射部から発光素子を過度に第１方向に離間させなくても、導光板部において発光素子と対向している部分と、かかる領域から第２方向にずれた位置とにおける光源光の入射光量の差が小さい。それ故、導光板部から照明光を出射した際、導光板部の光入射部付近において、発光素子と対向している部分からの照明光の出射強度と、かかる領域から第２方向にずれた位置からの照明光の出射強度との差が小さい。よって、第１方向に延在する導光板部を第２方向に複数並列させた場合でも、導光板部や発光素子の数が比較的少なく、かつ、第１方向における寸法が比較的小さくても、照明光の出射強度の均一化を図ることができる。   In the illuminating device according to the present invention, when controlling the emission intensity of the illumination light for each region, the light guide plate portion having a planar shape in which the lengths of two sides facing each other in the first direction are different from each other in the first direction. Conversely, the light source light emitted from the light emitting elements is made incident on the light guide plate portion from the end face located in the first direction in the light guide plate portion. For this reason, unlike the case where an integrated light guide plate is used, it is possible to prevent the light source light from spreading too much, so that the emission intensity of the illumination light can be suitably controlled for each region. Here, the light emitting element causes light source light to enter the light guide plate portion from an end surface located on the first side (short side) of the two sides facing each other in the first direction of the light guide plate portion. For this reason, in the light guide plate portion, it is possible to avoid a situation in which the size in the second direction of the end face (light incident portion) on which the light source light enters is excessively larger than the size in the second direction of the light emitting element. it can. Therefore, even if the light emitting element is not excessively separated from the light incident portion of the light guide plate portion in the first direction, the portion facing the light emitting element in the light guide plate portion and the position shifted from the region in the second direction The difference in the amount of incident light of the light source is small. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light emitting element in the vicinity of the light incident portion of the light guide plate portion is shifted in the second direction from the region. The difference with the emission intensity of the illumination light from the position is small. Therefore, even when a plurality of light guide plate portions extending in the first direction are arranged in parallel in the second direction, the number of light guide plate portions and light emitting elements is relatively small, and the size in the first direction is relatively small. The emission intensity of illumination light can be made uniform.

本発明の実施の形態１に係る液晶装置の全体構成を示す説明図である。It is explanatory drawing which shows the whole structure of the liquid crystal device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る液晶装置の分解斜視図である。1 is an exploded perspective view of a liquid crystal device according to Embodiment 1 of the present invention. 本発明の実施の形態１に係る照明装置の要部構成を示す説明図である。It is explanatory drawing which shows the principal part structure of the illuminating device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る照明装置の導光板部の１つから照明光を出射した際の出射強度を示す説明図である。It is explanatory drawing which shows the emitted intensity at the time of radiating | emitting illumination light from one of the light-guide plate parts of the illuminating device which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る照明装置の平面構成を示す説明図である。It is explanatory drawing which shows the planar structure of the illuminating device which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る照明装置の平面構成を示す説明図である。It is explanatory drawing which shows the planar structure of the illuminating device which concerns on Embodiment 3 of this invention. 本発明の実施の形態１〜３の変形例１に係る照明装置の断面構成を示す説明図である。It is explanatory drawing which shows the cross-sectional structure of the illuminating device which concerns on the modification 1 of Embodiment 1-3 of this invention. 本発明の実施の形態１〜３の変形例２に係る照明装置の要部構成を示す説明図である。It is explanatory drawing which shows the principal part structure of the illuminating device which concerns on the modification 2 of Embodiment 1-3 of this invention. 本発明を適用した液晶装置を備えた電子機器の説明図である。It is explanatory drawing of the electronic device provided with the liquid crystal device to which this invention is applied. 従来の照明装置の説明図である。It is explanatory drawing of the conventional illuminating device.

図面を参照して、本発明の実施の形態を説明する。なお、以下の説明で参照する図においては、各層や各部材を図面上で認識可能な程度の大きさとするため、各層や各部材毎に縮尺を異ならしめてある。また、以下の説明においては、導光板や液晶パネルの面内方向で互いに交差する方向をＸ軸方向およびＹ軸方向とし、Ｘ軸方向およびＹ軸方向に交差する方向をＺ軸方向とする。また、以下に参照する図面では、Ｘ軸方向の一方側をＸ１側とし、他方側をＸ２側とし、Ｙ軸方向の一方側をＹ１側とし、他方側をＹ２側とし、Ｚ軸方向の一方側をＺ１側（下側）とし、他方側（照明光や表示光が出射される側）をＺ２側（上側）として表してある。   Embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to in the following description, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. In the following description, the directions intersecting each other in the in-plane direction of the light guide plate or the liquid crystal panel are defined as the X-axis direction and the Y-axis direction, and the directions intersecting the X-axis direction and the Y-axis direction are defined as the Z-axis direction. In the drawings referred to below, one side in the X-axis direction is the X1 side, the other side is the X2 side, one side in the Y-axis direction is the Y1 side, the other side is the Y2 side, and one side in the Z-axis direction The side is represented as the Z1 side (lower side), and the other side (the side from which illumination light or display light is emitted) is represented as the Z2 side (upper side).

［実施の形態１］
（全体構成）
図１は、本発明の実施の形態１に係る液晶装置の全体構成を示す説明図であり、図１（ａ）、（ｂ）は、液晶装置の外観を示す斜視図、および液晶装置の断面図である。図２は、本発明の実施の形態１に係る液晶装置の分解斜視図である。 [Embodiment 1]
(overall structure)
1A and 1B are explanatory views showing an overall configuration of a liquid crystal device according to Embodiment 1 of the present invention. FIGS. 1A and 1B are a perspective view showing an appearance of the liquid crystal device and a cross section of the liquid crystal device. FIG. FIG. 2 is an exploded perspective view of the liquid crystal device according to Embodiment 1 of the present invention.

図１および図２において、本形態の液晶装置１００は、概ね、いわゆるバックライトと称せられる照明装置８と、この照明装置８の上面に重ねて配置された透過型あるいは半透過型の液晶パネル１０とを備えている。本形態において、液晶パネル１０は、透過型の液晶パネルからなる。また、液晶装置１００は、液晶パネル１０および照明装置８を内側に保持する樹脂製の樹脂フレーム３０と、樹脂フレーム３０の下側（表示面とは反対側／Ｚ軸方向の一方側Ｚ１）に配置された下金枠４０と、樹脂フレーム３０の上側（表示面の側／Ｚ軸方向の他方側Ｚ２）に配置された上金枠５０とを備えている。樹脂フレーム３０と下金枠４０とは、インサート成形あるいはアウトサート成形により一体に形成されることがある。   1 and 2, a liquid crystal device 100 according to the present embodiment includes an illuminating device 8 generally called a so-called backlight, and a transmissive or transflective liquid crystal panel 10 disposed on the upper surface of the illuminating device 8. And. In this embodiment, the liquid crystal panel 10 is a transmissive liquid crystal panel. The liquid crystal device 100 includes a resin frame 30 made of resin that holds the liquid crystal panel 10 and the lighting device 8 inside, and a lower side of the resin frame 30 (on the side opposite to the display surface / one side Z1 in the Z-axis direction). The lower metal frame 40 is disposed, and the upper metal frame 50 is disposed on the upper side of the resin frame 30 (the display surface side / the other side Z2 in the Z-axis direction). The resin frame 30 and the lower metal frame 40 may be integrally formed by insert molding or outsert molding.

液晶パネル１０は、四角形の平面形状を有しており、画素電極１５等が形成された素子基板１１と、素子基板１１に対して所定の隙間を介して対向配置された対向基板１２と、この対向基板１２と素子基板１１とを貼り合せるシール材１４とを備えている。かかる液晶パネル１０では、シール材１４で囲まれた領域内に液晶層１３が保持されている。素子基板１１および対向基板１２はガラス基板等の透光性基板からなる。素子基板１１では、Ｘ軸方向に複数本の走査線（図示せず）が延在している一方、Ｙ軸方向には複数本のデータ線が延在しており、走査線とデータ線（図示せず）との交差に対応して、スイッチング素子（図示せず）および画素電極１５が設けられている。   The liquid crystal panel 10 has a quadrangular planar shape, and includes an element substrate 11 on which the pixel electrodes 15 and the like are formed, a counter substrate 12 disposed to face the element substrate 11 with a predetermined gap therebetween, A sealing material 14 for bonding the counter substrate 12 and the element substrate 11 is provided. In the liquid crystal panel 10, the liquid crystal layer 13 is held in a region surrounded by the sealing material 14. The element substrate 11 and the counter substrate 12 are made of a light-transmitting substrate such as a glass substrate. In the element substrate 11, a plurality of scanning lines (not shown) extend in the X-axis direction, while a plurality of data lines extend in the Y-axis direction. A switching element (not shown) and a pixel electrode 15 are provided corresponding to the intersection with the pixel electrode 15 (not shown).

本形態では、対向基板１２が表示光の出射側に配置され、素子基板１１は照明装置８の側に配置されている。液晶パネル１０は、ＴＮ（Twisted Nematic）方式、ＥＣＢ（Electrically Controlled Birefringence）方式、あるいはＶＡＮ（Vertical Aligned Nematic）方式の液晶パネルとして構成されており、素子基板１１に画素電極１５が形成され、対向基板１２に共通電極１６が形成されている。本形態において、液晶パネル１０は対角３．５インチ、３２０×４８０画素である。なお、液晶パネル１０がＩＰＳ（In Plane Switching）方式や、ＦＦＳ（Fringe Field Switching）方式の液晶パネルである場合、共通電極１６は、素子基板１１の側に設けられる。また、素子基板１１が対向基板１２に対して表示光の出射側に配置されることもある。液晶パネル１０の上面には上偏光板１８が重ねて配置され、液晶パネル１０の下面と照明装置８との間には下偏光板１７が配置されている。   In this embodiment, the counter substrate 12 is disposed on the display light emission side, and the element substrate 11 is disposed on the illumination device 8 side. The liquid crystal panel 10 is configured as a liquid crystal panel of a TN (Twisted Nematic) method, an ECB (Electrically Controlled Birefringence) method, or a VAN (Vertical Aligned Nematic) method, and a pixel electrode 15 is formed on the element substrate 11, and a counter substrate is formed. 12 has a common electrode 16 formed thereon. In this embodiment, the liquid crystal panel 10 has a diagonal size of 3.5 inches and 320 × 480 pixels. When the liquid crystal panel 10 is an IPS (In Plane Switching) type or FFS (Fringe Field Switching) type liquid crystal panel, the common electrode 16 is provided on the element substrate 11 side. Further, the element substrate 11 may be disposed on the display light emission side with respect to the counter substrate 12. An upper polarizing plate 18 is disposed on the upper surface of the liquid crystal panel 10, and a lower polarizing plate 17 is disposed between the lower surface of the liquid crystal panel 10 and the lighting device 8.

素子基板１１において、対向基板１２の縁からの張り出し部分１１０の上面には駆動用ＩＣ１４０が実装されているとともに、かかる張り出し部分１１０の端部にはフレキシブル基板２００が接続されている。フレキシブル基板２００には、液晶パネル１０に画像データを出力する表示制御用ＩＣ２５０と、照明装置８での点灯を制御する光源駆動用ＩＣ２８０（光源駆動部）とが実装されている。   In the element substrate 11, the driving IC 140 is mounted on the upper surface of the protruding portion 110 from the edge of the counter substrate 12, and the flexible substrate 200 is connected to the end portion of the protruding portion 110. Mounted on the flexible substrate 200 are a display control IC 250 for outputting image data to the liquid crystal panel 10 and a light source driving IC 280 (light source driving unit) for controlling lighting in the illumination device 8.

本形態において、光源駆動用ＩＣ２８０は、液晶パネル１０に対する駆動に連動して、照明装置８からの照明光の出射強度を領域毎に制御する。より具体的には、本形態の液晶装置１００では、液晶パネル１０において輝度が高い画像を表示する領域には照明装置８からの照明光の出射強度を大とし、輝度が低い画像を表示する領域には照明装置８からの照明光の出射強度を小とするローカルディミング方式が採用されている。かかる動作は、表示制御用ＩＣ２５０の制御の下、光源駆動用ＩＣ２８０が照明装置８に用いた発光素子８９への駆動電流を制御することにより実行される。   In this embodiment, the light source driving IC 280 controls the emission intensity of the illumination light from the illumination device 8 for each region in conjunction with the driving of the liquid crystal panel 10. More specifically, in the liquid crystal device 100 of the present embodiment, the region where an image with high luminance is displayed on the liquid crystal panel 10 has a high emission intensity of illumination light from the lighting device 8 and an image with low luminance is displayed. Employs a local dimming method in which the intensity of illumination light emitted from the illumination device 8 is reduced. This operation is executed by the light source driving IC 280 controlling the driving current to the light emitting element 89 used in the lighting device 8 under the control of the display control IC 250.

照明装置８は、液晶パネル１０の下面側に対して重ねて配置された矩形の導光板８０と、白色光を出射する発光ダイオード等の発光素子８９とを備えており、導光板８０は、アクリル樹脂やポリカーボネート樹脂等からなる透光性の樹脂板である。液晶パネル１０に接続されているフレキシブル基板２００は両面基板であり、発光素子８９は、フレキシブル基板２００で延在する帯状部分２１０等に実装されている。詳しくは後述するように、導光板８０は、光入射部８８を備えており、発光素子８９から出射された光源光は、光入射部８８から導光板８０に入射した後、導光板８０内を進行しながら上面の光出射面８５から照明光として出射される。また、照明装置８において、導光板８０の下面には反射シート１８７が重ねて配置され、導光板８０の上面には拡散シート１８２、プリズムシート１８３、１８４等の光学シートが重ねて配置されている。本形態において、２枚のプリズムシート１８３、１８４は、互いの稜線が直交するように配置されている。このため、導光板８０の光出射面８５から出射された照明光は、拡散シート１８２によって全方向に拡散した後、２枚のプリズムシート１８３、１８４によって、液晶パネル１０の正面方向にピークを持つような指向性が付与されている。   The illuminating device 8 includes a rectangular light guide plate 80 that is disposed so as to overlap the lower surface side of the liquid crystal panel 10 and a light emitting element 89 such as a light emitting diode that emits white light. A translucent resin plate made of resin, polycarbonate resin, or the like. The flexible substrate 200 connected to the liquid crystal panel 10 is a double-sided substrate, and the light emitting element 89 is mounted on a belt-like portion 210 or the like extending on the flexible substrate 200. As will be described in detail later, the light guide plate 80 includes a light incident portion 88, and the light source light emitted from the light emitting element 89 enters the light guide plate 80 from the light incident portion 88 and then passes through the light guide plate 80. The light is emitted as illumination light from the light emitting surface 85 on the upper surface while traveling. In the lighting device 8, a reflection sheet 187 is disposed on the lower surface of the light guide plate 80, and optical sheets such as a diffusion sheet 182 and prism sheets 183 and 184 are disposed on the upper surface of the light guide plate 80. . In this embodiment, the two prism sheets 183 and 184 are arranged so that their ridge lines are orthogonal to each other. Therefore, the illumination light emitted from the light exit surface 85 of the light guide plate 80 has a peak in the front direction of the liquid crystal panel 10 by the two prism sheets 183 and 184 after being diffused in all directions by the diffusion sheet 182. Such directivity is given.

このようにして、本形態では、導光板８０、発光素子８９、フレキシブル基板２００の帯状部分２１０、光学シート（反射シート１８７、拡散シート１８２、プリズムシート１８３、１８４）、および光源駆動用ＩＣ２８０（光源駆動部）によって、照明装置８が構成されている。ここで、フレキシブル基板２００の帯状部分２１０は、導光板８０において相対向する２つの辺に沿って延在しており、図３等を参照して後述するように、発光素子８９は、導光板８０において相対向する２辺に沿って配置されている。   In this manner, in this embodiment, the light guide plate 80, the light emitting element 89, the belt-like portion 210 of the flexible substrate 200, the optical sheet (reflective sheet 187, diffusion sheet 182, prism sheets 183, 184), and light source driving IC 280 (light source) The illuminating device 8 is comprised by the drive part. Here, the belt-like portion 210 of the flexible substrate 200 extends along two opposite sides of the light guide plate 80, and as described later with reference to FIG. At 80, they are arranged along two opposite sides.

なお、樹脂フレーム３０は、矩形枠状であり、液晶パネル１０の側端部に対向する４つの側壁３１を備えている。かかる４つの側壁３１のうち、３つの側壁３１の内側には段部３６が形成されている。かかる段部３６の上には、両面テープ等により、液晶パネル１０が固定され、段部３６の内側に照明装置８の導光板８０や発光素子８９等が配置されている。下金枠４０は、ＳＵＳ板等の薄い金属板に対するプレス加工等により形成されてなる。下金枠４０は、底板部４３と、底板部４３の外周縁から起立する４つの側板部４１とを備えており、上面が開口する矩形の箱状になっている。かかる下金枠４０の底板部４３の上に樹脂フレーム３０が保持される。上金枠５０も、下金枠４０と同様、ＳＵＳ板等の薄い金属板に対するプレス加工等により形成されてなる。上金枠５０は、矩形の上板部５３と、上板部５３の外周縁から下方に折れ曲がった４つの側板部５１とを備えており、下面が開口する矩形の箱状になっている。側板部５１は、液晶パネル１０の側端部を覆っており、上板部５３は、液晶パネル１０の表示光出射側を覆っている。ここで、上金枠５０の上板部５３には、液晶パネル１０から出射された光を出射する矩形の開口部５３０が形成されている。このため、上金枠５０の上板部５３は、液晶パネル１０の表示光出射側のうち、外周端部を全周にわたって覆っている。下金枠４０において、側板部４１には、側板部４１に対する切り起こし加工によって斜め下向きのフック部４５が形成されており、上金枠５０において、側板部５１には、側板部５１に対する切り起こし加工によって斜め上向きのフック部５５が形成されている。このため、液晶パネル１０、照明装置８および樹脂フレーム３０に対して下金枠４０および上金枠５０を重ねた状態で、上金枠５０を下金枠４０に向けて押圧すると、フック部４５、５５同士が自動的に係合し、上金枠５０と下金枠４０とは側板部４１、５１で結合された状態となる。   The resin frame 30 has a rectangular frame shape and includes four side walls 31 that face the side end portions of the liquid crystal panel 10. Of the four side walls 31, a step portion 36 is formed inside the three side walls 31. On the step portion 36, the liquid crystal panel 10 is fixed by a double-sided tape or the like, and the light guide plate 80, the light emitting element 89, and the like of the lighting device 8 are disposed inside the step portion 36. The lower metal frame 40 is formed by pressing a thin metal plate such as a SUS plate. The lower metal frame 40 includes a bottom plate portion 43 and four side plate portions 41 rising from the outer peripheral edge of the bottom plate portion 43, and has a rectangular box shape with an open top surface. The resin frame 30 is held on the bottom plate portion 43 of the lower metal frame 40. Similar to the lower metal frame 40, the upper metal frame 50 is also formed by pressing a thin metal plate such as a SUS plate. The upper metal frame 50 includes a rectangular upper plate portion 53 and four side plate portions 51 bent downward from the outer peripheral edge of the upper plate portion 53, and has a rectangular box shape with an open lower surface. The side plate portion 51 covers the side end portion of the liquid crystal panel 10, and the upper plate portion 53 covers the display light emission side of the liquid crystal panel 10. Here, a rectangular opening 530 for emitting light emitted from the liquid crystal panel 10 is formed in the upper plate portion 53 of the upper metal frame 50. For this reason, the upper plate portion 53 of the upper metal frame 50 covers the outer peripheral end portion of the display light emitting side of the liquid crystal panel 10 over the entire circumference. In the lower metal frame 40, the side plate portion 41 is formed with a diagonally downward hook portion 45 by cutting and raising the side plate portion 41. In the upper metal frame 50, the side plate portion 51 is cut and raised with respect to the side plate portion 51. An obliquely upward hook portion 55 is formed by processing. Therefore, when the upper metal frame 50 is pressed toward the lower metal frame 40 in a state where the lower metal frame 40 and the upper metal frame 50 are overlapped with the liquid crystal panel 10, the lighting device 8, and the resin frame 30, the hook portion 45. 55 and 55 are automatically engaged with each other, and the upper metal frame 50 and the lower metal frame 40 are joined by the side plate portions 41 and 51.

（照明装置８の詳細構成）
図３は、本発明の実施の形態１に係る照明装置８の要部構成を示す説明図であり、図３（ａ）、（ｂ）は、照明装置８の平面構成を示す説明図、および図３のＸ１−Ｘ１′線に沿って照明装置８を切断した様子を示す説明図である。なお、以下の説明においては、第１方向、第２方向および第３方向は各々、以下の方向
第１方向＝Ｙ軸方向
第２方向＝Ｘ軸方向
第３方向＝Ｚ軸方向
に相当する。また、「第１辺」は短辺８１２に相当し、「第２辺」は長辺８１１に相当する。 (Detailed configuration of lighting device 8)
FIG. 3 is an explanatory diagram showing a main configuration of the illumination device 8 according to Embodiment 1 of the present invention, and FIGS. 3A and 3B are explanatory diagrams showing a planar configuration of the illumination device 8, and FIG. It is explanatory drawing which shows a mode that the illuminating device 8 was cut | disconnected along the X1-X1 'line | wire of FIG. In the following description, the first direction, the second direction, and the third direction respectively correspond to the following directions: First direction = Y-axis direction Second direction = X-axis direction Third direction = Z-axis direction The “first side” corresponds to the short side 812, and the “second side” corresponds to the long side 811.

図３に示すように、本形態の照明装置８において、導光板８０では、光出射面８５の面内方向で互いに交差するＹ軸方向（第１方向）およびＸ軸方向（第２方向）のうち、Ｙ軸方向で対向する２辺の長さが相違する台形形状の平面形状を有する複数の導光板部８１（８１ａ〜８１ｆ）がＸ軸方向に並列するように配置されており、かかる導光板部８１に一対一の関係をもって発光素子８９が配置されている。本形態において、発光素子８９は、白色光を出射するＬＥＤ（Light Emitting Diode）であり、光源光を発散光として出射する。   As shown in FIG. 3, in the lighting device 8 of the present embodiment, the light guide plate 80 has a Y-axis direction (first direction) and an X-axis direction (second direction) that intersect each other in the in-plane direction of the light exit surface 85. Among them, a plurality of light guide plate portions 81 (81a to 81f) having a trapezoidal planar shape in which the lengths of two sides facing each other in the Y-axis direction are different from each other are arranged in parallel in the X-axis direction. Light emitting elements 89 are arranged on the optical plate portion 81 in a one-to-one relationship. In this embodiment, the light emitting element 89 is an LED (Light Emitting Diode) that emits white light, and emits light source light as divergent light.

ここで、複数の導光板部８１は、Ｙ軸方向における向きを逆にしてＸ軸方向に交互に配列されている。このため、複数の導光板部８１のうち、隣り合う導光板部８１のいずれにおいても、Ｙ軸方向における向きが逆である。より具体的には、複数の導光板部８１のうち、導光板部８１ａ、８１ｃ、８１ｅは、Ｙ軸方向で対向する２辺のうち、長辺８１１をＹ軸方向の一方側Ｙ１に向けており、短辺８１２をＹ軸方向の他方側Ｙ２に向けている。これに対して、導光板部８１ｂ、８１ｄ、８１ｆは、長辺８１１をＹ軸方向の他方側Ｙ２に向けており、短辺８１２をＹ軸方向の一方側Ｙ１に向けている。また、複数の導光板部８１はいずれも同一形状を有しており、長辺８１１および短辺８１２に対して直交する方向に延在して長辺８１１および短辺８１２の端部同士を結ぶ側辺８１３と、斜めに延在して長辺８１１および短辺８１２の他の端部同士を結ぶ斜辺８１４とを備えている。このため、２つの導光板部８１ａ、８１ｂを斜辺８１４同士が接するように配置すると、導光板部８１ａ、８１ｂはＹ軸方向に長辺を向ける延在する四角形となる。また、他の導光板部（導光板部８１ｃ、８１ｄ、および導光板部８１ｅ、８１ｆ）も同様である。このため、２つの導光板部８１を斜辺８１４同士が接するように組み合わせたものをＹ軸方向に配置するだけで、長方形の平面形状を有する導光板８０を構成することができる。   Here, the plurality of light guide plate portions 81 are alternately arranged in the X-axis direction with the direction in the Y-axis direction reversed. For this reason, the direction in the Y-axis direction is reversed in any of the light guide plate portions 81 adjacent to each other among the plurality of light guide plate portions 81. More specifically, among the plurality of light guide plate portions 81, the light guide plate portions 81a, 81c, and 81e have the long side 811 facing the one side Y1 in the Y axis direction among the two sides facing each other in the Y axis direction. The short side 812 is directed to the other side Y2 in the Y-axis direction. On the other hand, the light guide plate portions 81b, 81d, and 81f have the long side 811 facing the other side Y2 in the Y-axis direction and the short side 812 facing the one side Y1 in the Y-axis direction. The plurality of light guide plate portions 81 all have the same shape, and extend in a direction orthogonal to the long side 811 and the short side 812 to connect the end portions of the long side 811 and the short side 812. A side 813 is provided, and an oblique side 814 extending obliquely and connecting the other ends of the long side 811 and the short side 812 is provided. For this reason, when the two light guide plate portions 81a and 81b are arranged so that the oblique sides 814 are in contact with each other, the light guide plate portions 81a and 81b have a rectangular shape extending in the Y-axis direction with the long sides directed. The same applies to the other light guide plate portions (light guide plate portions 81c and 81d and light guide plate portions 81e and 81f). For this reason, the light guide plate 80 having a rectangular planar shape can be configured only by arranging two light guide plate portions 81 combined so that the oblique sides 814 are in contact with each other in the Y-axis direction.

本形態において、導光板部８１は、例えば、厚さ寸法が１ｍｍ、Ｙ軸方向の長さ寸法７５ｍｍであり、長辺８１１の長さが１３ｍｍ、短辺８１２の長さが４ｍｍである。このため、導光板は、５１ｍｍ×７５ｍｍの平面サイズを有している。   In this embodiment, the light guide plate portion 81 has, for example, a thickness dimension of 1 mm, a length dimension of 75 mm in the Y-axis direction, a long side 811 having a length of 13 mm, and a short side 812 having a length of 4 mm. For this reason, the light guide plate has a planar size of 51 mm × 75 mm.

このように構成した導光板８０に発光素子８９を配置するにあたって、本形態では、複数の導光板部８１のいずれにおいても、短辺８１２側に位置する端面が光入射部８８になっており、かかる光入射部８８に発光素子８９が発光面を向けている。また、導光板部８１において、反射シート１８７が位置する側の面には、散乱パターンが形成されており、本形態において、散乱パターンの密度は、発光素子８９から離れるに従って高くなっている。このため、導光板部８１から出射される照明光の強度分布は、発光素子８９からの距離にかかわらず、均一化されている。かかる散乱パターンとしては、導光板部の表面に凹状の窪みを設けた構成や、散乱部材を印刷した構成等を採用することができる。   In arranging the light emitting element 89 on the light guide plate 80 configured in this way, in this embodiment, the end face located on the short side 812 side is the light incident portion 88 in any of the plurality of light guide plate portions 81. The light emitting element 89 has the light emitting surface facing the light incident portion 88. In the light guide plate 81, a scattering pattern is formed on the surface on which the reflection sheet 187 is located. In this embodiment, the density of the scattering pattern increases as the distance from the light emitting element 89 increases. For this reason, the intensity distribution of the illumination light emitted from the light guide plate portion 81 is made uniform regardless of the distance from the light emitting element 89. As this scattering pattern, the structure which provided the concave hollow on the surface of the light-guide plate part, the structure which printed the scattering member, etc. are employable.

本形態において、複数の導光板部８１は各々が、独立した樹脂板からなり、側辺８１３および斜辺８１４に相当する端面は、散乱処理によって微細凹凸が付された光散乱面８２１になっている。このため、Ｙ軸方向で隣り合う導光板部８１の間８２には光散乱面８２１が設けられている。これに対して、導光板部８１において光入射部８８とされた短辺８１２側の端面は、光源光の導光板部８１内への入射効率を高めることを目的に、散乱処理はされず平坦面となっている。また、導光板部８１において、光入射部８８に対向する長辺８１１側の端面は、平坦面になっており、それ故、長辺８１１側の端面に到達した光は反射され、再度、導光板部８１内を伝播するようになっている。   In this embodiment, each of the plurality of light guide plate portions 81 is made of an independent resin plate, and end surfaces corresponding to the side 813 and the oblique side 814 are light scattering surfaces 821 to which fine irregularities are given by scattering treatment. . For this reason, a light scattering surface 821 is provided between the light guide plate portions 81 adjacent in the Y-axis direction. On the other hand, the end surface on the short side 812 side that is the light incident portion 88 in the light guide plate portion 81 is flat without being subjected to scattering treatment for the purpose of increasing the incidence efficiency of the light source light into the light guide plate portion 81. It is a surface. Further, in the light guide plate portion 81, the end surface on the long side 811 side facing the light incident portion 88 is a flat surface. Therefore, the light reaching the end surface on the long side 811 side is reflected and guided again. It propagates through the optical plate portion 81.

（照明光の出射特性）
図４は、本発明の実施の形態１に係る照明装置８の導光板部８１の１つから照明光を出射した際の出射強度を示す説明図である。本形態の液晶装置１００では、ローカルディミング方式が採用されており、液晶パネル１０において輝度が高い画像を表示する領域には照明装置８が照明光の出射強度を大とし、輝度が低い画像を表示する領域には照明装置８が照明光の出射強度を小とする。かかる点灯動作の際、例えば、図４に示すように、複数の導光板部８１のうち、導光板部８１ｅに設けられた発光素子８９が点灯し、両側の発光素子８９が消灯状態にあったとする。 (Lighting characteristics of illumination light)
FIG. 4 is an explanatory diagram showing the emission intensity when the illumination light is emitted from one of the light guide plate portions 81 of the illumination device 8 according to Embodiment 1 of the present invention. In the liquid crystal device 100 of the present embodiment, the local dimming method is adopted, and the illumination device 8 increases the emission intensity of illumination light and displays an image with low luminance in an area where an image with high luminance is displayed on the liquid crystal panel 10. The illumination device 8 makes the emission intensity of the illumination light small in the region to be illuminated. At the time of such lighting operation, for example, as shown in FIG. 4, among the plurality of light guide plate portions 81, the light emitting elements 89 provided on the light guide plate portion 81e are turned on, and the light emitting elements 89 on both sides are turned off. To do.

このような場合、まず、導光板部８１ｅからは位置によらず強度が均一な照明光が出射される。ここで、複数の導光板部８１は各々が、独立した樹脂板からなり、側辺８１３および斜辺８１４に相当する端面は散乱面になっている。このため、導光板部８１ｅ内を進行する光の一部が側辺８１３および斜辺８１４に相当する端面から出射され、隣りの導光板部８１ｄ、８１ｆに入射する。このため、隣り合う導光板部８１の間８２（境界部分）において照明光の出射強度がなだらかに減少し、急激に変化することを抑制することができる。   In such a case, first, illumination light having a uniform intensity is emitted from the light guide plate portion 81e regardless of the position. Here, each of the plurality of light guide plate portions 81 is made of an independent resin plate, and end surfaces corresponding to the side 813 and the hypotenuse 814 are scattering surfaces. For this reason, a part of the light traveling in the light guide plate portion 81e is emitted from the end surfaces corresponding to the side 813 and the oblique side 814, and enters the adjacent light guide plate portions 81d and 81f. For this reason, it is possible to suppress a sudden decrease in the intensity of the emitted illumination light between the adjacent light guide plate portions 81 (boundary portion) 82, and a rapid change.

（本形態の主な効果）
以上説明したように、本形態では、ローカルディミングを採用して画像のコントラストの向上や、低消費電力化を図るにあたって、Ｙ軸方向（第１方向）で対向する２辺の長さが相違する台形形状の平面形状をもつ導光板部８１を、Ｙ軸方向における向きを逆にしてＸ軸方向（第２方向）に配列してある。また、導光板部８１においてＹ軸方向に位置する端面から導光板部８１内に発光素子８９から出射された光源光を入射させる。このため、一体の導光板を用いた場合と違って光源光が広がり過ぎることを抑制することができるので、照明光の出射強度を領域毎に好適に制御することができる。 (Main effects of this form)
As described above, in this embodiment, when using local dimming to improve image contrast and reduce power consumption, the lengths of two sides facing each other in the Y-axis direction (first direction) are different. Light guide plate portions 81 having a trapezoidal planar shape are arranged in the X-axis direction (second direction) with the direction in the Y-axis direction reversed. Further, the light source light emitted from the light emitting element 89 is made incident on the light guide plate portion 81 from the end face located in the Y-axis direction in the light guide plate portion 81. For this reason, unlike the case where an integrated light guide plate is used, it is possible to prevent the light source light from spreading too much, so that the emission intensity of the illumination light can be suitably controlled for each region.

ここで、発光素子８９は、導光板部８１の短辺８１２側に位置する端面から導光板部８１内に光源光を入射させる。このため、導光板部８１においては、光源光が入射する端面（光入射部８８）のＸ軸方向のサイズが発光素子８９のＸ軸方向のサイズに比して過剰に大きくなるという事態を回避することができる。従って、導光板部８１の光入射部８８から発光素子８９を過度に離間させなくても、導光板部８１において発光素子８９と対向している部分と、かかる領域からＸ軸方向にずれた位置とにおいて光源光の入射光量の差が小さい。それ故、導光板部８１から照明光を出射する際、導光板部８１の光入射部８８付近において、発光素子８９と対向している部分からの照明光の出射強度と、かかる領域からＸ軸方向にずれた位置からの照明光の出射強度との差が小さい。よって、Ｙ軸方向に延在する導光板部８１をＸ軸方向に複数配列させた場合でも、導光板部８１や発光素子８９の数が比較的少なく、かつ、Ｙ軸方向における照明装置８の寸法が比較的小さいままで、照明光の出射強度の均一化を図ることができる。   Here, the light emitting element 89 causes the light source light to enter the light guide plate portion 81 from the end face located on the short side 812 side of the light guide plate portion 81. For this reason, in the light guide plate portion 81, a situation in which the size in the X-axis direction of the end surface (light incident portion 88) on which the light source light enters is excessively larger than the size in the X-axis direction of the light emitting element 89 is avoided. can do. Therefore, even if the light emitting element 89 is not excessively separated from the light incident portion 88 of the light guide plate portion 81, the portion facing the light emitting element 89 in the light guide plate portion 81 and the position shifted from the region in the X-axis direction. The difference in the amount of incident light of the light source light is small. Therefore, when the illumination light is emitted from the light guide plate portion 81, the illumination light emission intensity from the portion facing the light emitting element 89 in the vicinity of the light incident portion 88 of the light guide plate portion 81, and the X axis from the region. The difference with the emission intensity | strength of the illumination light from the position shifted | deviated to the direction is small. Therefore, even when a plurality of light guide plate portions 81 extending in the Y axis direction are arranged in the X axis direction, the number of light guide plate portions 81 and light emitting elements 89 is relatively small, and the illumination device 8 in the Y axis direction is The emission intensity of illumination light can be made uniform while the dimensions are relatively small.

また、本形態では、隣り合う導光板部８１の間８２には光散乱面８２１が設けられているため、導光板部８１から隣りの導光板部８１に一部の光が漏れることになる。このため、隣り合う導光板部８１の境界部分において照明光の出射強度が急激に変化することを抑制することができる。それ故、品位の高い画像を表示することができる。   In this embodiment, since a light scattering surface 821 is provided between the adjacent light guide plate portions 81, a part of light leaks from the light guide plate portion 81 to the adjacent light guide plate portion 81. For this reason, it is possible to suppress a sudden change in the emission intensity of the illumination light at the boundary portion between the adjacent light guide plate portions 81. Therefore, a high quality image can be displayed.

また、複数の導光板部８１は、２辺（長辺８１１および短辺８１２）が平行な台形の平面形状を有しているため、導光板８０のＹ軸方向の両側で発光素子８９がＸ軸方向に直線的に並ぶ構成となる。従って、発光素子８９が実装された基板（フレキシブル基板２００の帯状部分２１０）を直線的に延在させることができる等、構成の簡素化を図ることができる。さらに、複数の導光板部８１は、斜辺８１４と、２辺（長辺８１１および短辺８１２）に対して直交するように延在する側辺８１３とを備えている。このため、側辺８１３が外側に配置するように導光板部８１を配置するだけで導光板８０を長方形とすることができる。   Further, since the plurality of light guide plate portions 81 have a trapezoidal planar shape in which two sides (long side 811 and short side 812) are parallel, the light emitting elements 89 are X on both sides of the light guide plate 80 in the Y-axis direction. It becomes the structure which is located in a line in the axial direction. Therefore, it is possible to simplify the configuration, for example, the substrate on which the light emitting element 89 is mounted (the belt-like portion 210 of the flexible substrate 200) can be linearly extended. Further, the plurality of light guide plate portions 81 include a hypotenuse 814 and a side 813 extending so as to be orthogonal to two sides (long side 811 and short side 812). For this reason, it is possible to make the light guide plate 80 rectangular simply by arranging the light guide plate portion 81 so that the side 813 is arranged outside.

なお、本形態では、Ｙ軸方向で隣り合う導光板部８１の間８２に光散乱面８２１を設けるにあたって、側辺８１３および斜辺８１４の双方を光散乱面８２１としたが、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１の側辺８１３あるいは斜辺８１４が光散乱面８２１になっている構成を採用してもよい。かかる構成では、Ｙ軸方向で隣り合う導光板部８１の間で光散乱面８２１を兼用した構成となるので、側辺８１３および斜辺８１４の双方を光散乱面８２１とした場合と同様な効果を得ることができる。また、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１の側辺８１３あるいは斜辺８１４のみが光散乱面８２１になっている構成の場合、散乱処理をすべき対象が限られるので、生産性を向上することができる。   In this embodiment, when the light scattering surface 821 is provided between the light guide plate portions 81 adjacent in the Y-axis direction, both the side 813 and the oblique side 814 are the light scattering surfaces 821, but they are adjacent in the Y-axis direction. A configuration in which the side 813 or the oblique side 814 of one of the light guide plate portions 81 is a light scattering surface 821 may be employed. In this configuration, since the light scattering surface 821 is also used between the light guide plate portions 81 adjacent in the Y-axis direction, the same effect as when both the side 813 and the oblique side 814 are the light scattering surface 821 is obtained. Can be obtained. In addition, in the configuration in which only the side 813 or the oblique side 814 of one light guide plate 81 among the light guide plates 81 adjacent in the Y-axis direction is the light scattering surface 821, the target to be subjected to the scattering process is limited. Therefore, productivity can be improved.

また、本形態では、光入射部８８に対向する長辺８１１側の端面が平坦面になっている構成を採用したが、長辺８１１側の端面が散乱面あるいは反射面になっている構成を採用してもよく、この場合は、導光板８０内に伝播する光の利用効率を高めることができる。   Further, in this embodiment, a configuration in which the end surface on the long side 811 facing the light incident portion 88 is a flat surface is adopted, but a configuration in which the end surface on the long side 811 side is a scattering surface or a reflection surface. In this case, the utilization efficiency of light propagating in the light guide plate 80 can be increased.

［実施の形態２］
図５は、本発明の実施の形態２に係る照明装置８の平面構成を示す説明図である。実施の形態１では、ローカルディミング方式が採用された例であったが、本形態では、ローカルディミングを採用するとともに、矢印Ｙ０で示すように、液晶パネル１０において画素を線順次で走査する動作に連動して照明装置８からの照明光が出射される領域をシフトさせていくスキャンバックライトの例である。このため、以下の説明においては、第１方向、第２方向および第３方向は各々、以下の方向
第１方向＝Ｘ軸方向
第２方向＝Ｙ軸方向
第３方向＝Ｚ軸方向
に相当する。但し、本形態の基本的な構成は、実施の形態１と同様であるため、共通する部分には同一の符号を付して、それらの説明を省略する。 [Embodiment 2]
FIG. 5 is an explanatory diagram showing a planar configuration of the illumination device 8 according to Embodiment 2 of the present invention. In the first embodiment, the local dimming method is adopted. However, in this embodiment, the local dimming is adopted, and as shown by the arrow Y0, the liquid crystal panel 10 scans the pixels line-sequentially. This is an example of a scan backlight that shifts the region in which the illumination light from the illumination device 8 is emitted in conjunction. Therefore, in the following description, the first direction, the second direction, and the third direction respectively correspond to the following directions: First direction = X-axis direction Second direction = Y-axis direction Third direction = Z-axis direction . However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

図５に示すように、本形態の照明装置８においては、実施の形態１に対して、導光板部８１の配列方向を９０°回転させ、かつ、導光板部８１の数を増やした構成を有している。より具体的には、導光板８０は、Ｘ軸方向で対向する平行な２辺の長さが相違する台形形状の平面形状を有する複数の導光板部８１（８１ａ〜８１ｈ）がＹ軸方向に並列するように配置された構成を有しており、かかる導光板部８１に一対一の関係をもって発光素子８９が配置されている。   As shown in FIG. 5, the illumination device 8 of the present embodiment has a configuration in which the arrangement direction of the light guide plate portions 81 is rotated by 90 ° and the number of the light guide plate portions 81 is increased with respect to the first embodiment. Have. More specifically, the light guide plate 80 includes a plurality of light guide plate portions 81 (81a to 81h) having a trapezoidal planar shape in which the lengths of two parallel sides facing each other in the X axis direction are different in the Y axis direction. The light-emitting elements 89 are arranged in a one-to-one relationship with the light guide plate portion 81.

ここで、複数の導光板部８１は、Ｘ軸方向における向きを逆にしてＹ軸方向に交互に配列されている。このため、複数の導光板部８１のうち、隣り合う導光板部８１のいずれにおいても、Ｙ軸方向における向きが逆である。また、複数の導光板部８１はいずれも同一形状を有しており、長辺８１１および短辺８１２に対して直交する側辺８１３と、斜辺８１４とを備えている。このため、隣り合う導光板部８１ａ、８１ｂを斜辺８１４同士が接するように配置すると、導光板部８１ａ、８１ｂはＹ軸方向に長辺を向けて延在する四角形となる。また、他の導光板（導光板部８１ｃ、８１ｄ、導光板部８１ｅ、８１ｆ、および導光板部８１ｇ、８１ｈ）も同様である。このため、導光板８０は、長方形の平面形状を有している。   Here, the plurality of light guide plate portions 81 are alternately arranged in the Y-axis direction with the direction in the X-axis direction reversed. For this reason, the direction in the Y-axis direction is reversed in any of the light guide plate portions 81 adjacent to each other among the plurality of light guide plate portions 81. The plurality of light guide plate portions 81 have the same shape, and include a side 813 that is orthogonal to the long side 811 and the short side 812, and a hypotenuse 814. For this reason, when the adjacent light guide plate portions 81a and 81b are arranged so that the hypotenuses 814 are in contact with each other, the light guide plate portions 81a and 81b have a quadrangular shape extending in the Y-axis direction with the long sides directed. The same applies to the other light guide plates (light guide plate portions 81c and 81d, light guide plate portions 81e and 81f, and light guide plate portions 81g and 81h). For this reason, the light guide plate 80 has a rectangular planar shape.

本形態において、導光板部８１は、例えば、厚さ寸法が１ｍｍ、Ｘ軸方向の長さ寸法５１ｍｍであり、長辺８１１の長さが１５ｍｍ、短辺８１２の長さが４ｍｍである。このため、導光板は、５１ｍｍ×７６ｍｍの平面サイズを有している。   In this embodiment, the light guide plate portion 81 has, for example, a thickness dimension of 1 mm, a length dimension in the X-axis direction of 51 mm, a long side 811 having a length of 15 mm, and a short side 812 having a length of 4 mm. For this reason, the light guide plate has a planar size of 51 mm × 76 mm.

このように構成した導光板８０に発光素子８９を配置するにあたって、本形態でも、実施の形態１と同様、複数の導光板部８１のいずれにおいても、短辺８１２側に位置する端面が光入射部８８になっており、かかる光入射部８８に発光素子８９が発光面を向けている。また、導光板部８１において、反射シート１８７が位置する側の面には、散乱パターンが形成されており、導光板部８１から出射される照明光の強度分布は、発光素子８９からの距離にかかわらず、均一化されている。また、複数の導光板部８１は各々が、独立した樹脂板からなり、側辺８１３および斜辺８１４に相当する端面は、散乱処理によって微細凹凸が付された光散乱面８２１になっている。このため、Ｙ軸方向で隣り合う導光板部８１の間８２には光散乱面８２１が設けられている。これに対して、導光板部８１において光入射部８８とされた短辺８１２側の端面、および光入射部８８に対向する長辺８１１側の端面はいずれも、平坦面になっている。   In arranging the light emitting element 89 on the light guide plate 80 configured in this way, in this embodiment as well, in any of the plurality of light guide plate portions 81, the end face located on the short side 812 side is light incident as in the first embodiment. The light emitting element 89 has a light emitting surface facing the light incident portion 88. In the light guide plate portion 81, a scattering pattern is formed on the surface where the reflection sheet 187 is located, and the intensity distribution of the illumination light emitted from the light guide plate portion 81 is a distance from the light emitting element 89. Regardless, it is uniform. Each of the plurality of light guide plate portions 81 is made of an independent resin plate, and end surfaces corresponding to the side 813 and the hypotenuse 814 are light scattering surfaces 821 to which fine irregularities are provided by scattering treatment. For this reason, a light scattering surface 821 is provided between the light guide plate portions 81 adjacent in the Y-axis direction. On the other hand, the end surface on the short side 812 side that is the light incident portion 88 in the light guide plate portion 81 and the end surface on the long side 811 side that faces the light incident portion 88 are both flat surfaces.

なお、本形態では、実施の形態１と同様、Ｙ軸方向で隣り合う導光板部８１の間８２に光散乱面８２１を設けるにあたって、側辺８１３および斜辺８１４の双方を光散乱面８２１としたが、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１の側辺８１３あるいは斜辺８１４が光散乱面８２１になっている構成を採用してもよい。かかる構成では、Ｙ軸方向で隣り合う導光板部８１の間で光散乱面８２１を兼用した構成となるので、側辺８１３および斜辺８１４の双方を光散乱面８２１とした場合と同様な効果を得ることができる。また、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１の側辺８１３あるいは斜辺８１４のみが光散乱面８２１になっている構成の場合、散乱処理をすべき対象が限られるので、生産性を向上することができる。また、本形態では、実施の形態１と同様、光入射部８８に対向する長辺８１１側の端面が平坦面になっている構成を採用したが、長辺８１１側の端面が散乱面あるいは反射面になっている構成を採用してもよく、この場合は、導光板８０内に伝播する光の利用効率を高めることができる。   In the present embodiment, as in the first embodiment, when the light scattering surface 821 is provided between the light guide plate portions 81 adjacent in the Y-axis direction, both the side 813 and the oblique side 814 are used as the light scattering surface 821. However, among the light guide plate portions 81 adjacent in the Y-axis direction, a configuration in which the side 813 or the oblique side 814 of one of the light guide plate portions 81 is a light scattering surface 821 may be adopted. In this configuration, since the light scattering surface 821 is also used between the light guide plate portions 81 adjacent in the Y-axis direction, the same effect as when both the side 813 and the oblique side 814 are the light scattering surface 821 is obtained. Can be obtained. In addition, in the configuration in which only the side 813 or the oblique side 814 of one light guide plate 81 among the light guide plates 81 adjacent in the Y-axis direction is the light scattering surface 821, the target to be subjected to the scattering process is limited. Therefore, productivity can be improved. In the present embodiment, as in the first embodiment, a configuration is adopted in which the end surface on the long side 811 facing the light incident portion 88 is a flat surface. However, the end surface on the long side 811 side is a scattering surface or a reflection surface. In this case, the utilization efficiency of light propagating in the light guide plate 80 can be increased.

以上説明したように、本形態では、ローカルディミングを採用して画像のコントラストの向上や低消費電力化を図るとともに、スキャンバックライト方式を採用して低消費電力化を図るにあたって、Ｘ軸方向（第１方向）で対向する平行な２辺の長さが相違する台形形状の平面形状をもつ導光板部８１を、Ｙ軸方向における向きを逆にしてＹ軸方向（第２方向）に配列してある。また、導光板部８１においてＸ軸方向に位置する端面から導光板部８１内に発光素子８９から出射された光源光を入射させる。このため、一体の導光板を用いた場合と違って光源光が広がり過ぎることを抑制することができるので、照明光の出射強度を領域毎に好適に制御することができる。また、スキャンバックライト方式を採用すれば、液晶パネル１０での走査とバックライトのスキャンを同期させるため、動画を表示した際の残像等を緩和することができる。   As described above, in this embodiment, local dimming is used to improve image contrast and reduce power consumption, and a scan backlight method is used to reduce power consumption. The light guide plate portions 81 having a trapezoidal planar shape with different lengths of two parallel sides facing each other in the first direction) are arranged in the Y-axis direction (second direction) with the direction in the Y-axis direction reversed. It is. Further, the light source light emitted from the light emitting element 89 is made incident into the light guide plate portion 81 from the end face located in the X-axis direction in the light guide plate portion 81. For this reason, unlike the case where an integrated light guide plate is used, it is possible to prevent the light source light from spreading too much, so that the emission intensity of the illumination light can be suitably controlled for each region. In addition, if the scan backlight method is employed, since the scan on the liquid crystal panel 10 and the scan of the backlight are synchronized, afterimages and the like when displaying a moving image can be reduced.

また、発光素子８９は、導光板部８１のＸ軸方向で対向する平行な２辺のうち、短辺８１２側に位置する端面から導光板部８１内に光源光を入射させる。このため、導光板部８１においては、光源光が入射する端面（光入射部８８）のＹ軸方向のサイズが発光素子８９のＹ軸方向のサイズに比して過剰に大きくなるという事態を回避することができる。従って、導光板部８１の光入射部８８から発光素子８９を過度に離間させなくても、導光板部８１において発光素子８９と対向している部分と、かかる領域からＹ軸方向にずれた位置とにおいて光源光の入射光量の差が小さい。それ故、導光板部８１から照明光を出射する際、導光板部８１の光入射部８８付近において、発光素子８９と対向している部分からの照明光の出射強度と、かかる領域からＹ軸方向にずれた位置からの照明光の出射強度との差が小さい。よって、Ｘ軸方向に延在する導光板部８１をＹ軸方向に複数配列させた場合でも、導光板部８１や発光素子８９の数が比較的少なく、かつ、Ｘ軸方向における照明装置８の寸法が比較的小さいままで、照明光の出射強度の均一化を図ることができる。   The light emitting element 89 causes light source light to enter the light guide plate portion 81 from an end surface located on the short side 812 side of two parallel sides facing each other in the X-axis direction of the light guide plate portion 81. For this reason, in the light guide plate portion 81, a situation in which the size in the Y axis direction of the end surface (light incident portion 88) on which the light source light enters is excessively larger than the size in the Y axis direction of the light emitting element 89 is avoided. can do. Therefore, even if the light emitting element 89 is not excessively separated from the light incident portion 88 of the light guide plate portion 81, the portion facing the light emitting element 89 in the light guide plate portion 81 and the position shifted from the region in the Y-axis direction. The difference in the amount of incident light of the light source light is small. Therefore, when the illumination light is emitted from the light guide plate portion 81, the intensity of the illumination light emitted from the portion facing the light emitting element 89 in the vicinity of the light incident portion 88 of the light guide plate portion 81, and the Y axis from the region. The difference with the emission intensity | strength of the illumination light from the position shifted | deviated to the direction is small. Therefore, even when a plurality of light guide plate portions 81 extending in the X-axis direction are arranged in the Y-axis direction, the number of light guide plate portions 81 and light emitting elements 89 is relatively small, and the illumination device 8 in the X-axis direction is The emission intensity of illumination light can be made uniform while the dimensions are relatively small.

また、本形態では、隣り合う導光板部８１の間８２には光散乱面８２１が設けられているため、導光板部８１から隣りの導光板部８１に一部の光が漏れることになる。このため、隣り合う導光板部８１の境界部分において照明光の出射強度が急激に変化することを抑制することができる等、実施の形態１と同様な効果を奏する。   In this embodiment, since a light scattering surface 821 is provided between the adjacent light guide plate portions 81, a part of light leaks from the light guide plate portion 81 to the adjacent light guide plate portion 81. For this reason, the same effects as those of the first embodiment can be obtained, for example, it is possible to suppress a sudden change in the intensity of emitted illumination light at the boundary portion between adjacent light guide plate portions 81.

［実施の形態３］
図６は、本発明の実施の形態３に係る照明装置８の平面構成を示す説明図であり、図６（ａ）、（ｂ）は、液晶装置１００を横長で使用する様子を示す説明図、および液晶装置１００を縦長で使用する様子を示す説明図である。なお、本形態の基本的な構成は、実施の形態１、２と同様であるため、共通する部分には同一の符号を付して、それらの説明を省略する。 [Embodiment 3]
6A and 6B are explanatory diagrams showing a planar configuration of the illumination device 8 according to Embodiment 3 of the present invention. FIGS. 6A and 6B are explanatory diagrams showing how the liquid crystal device 100 is used in landscape orientation. FIG. 4 is an explanatory diagram showing a state in which the liquid crystal device 100 is used in a portrait orientation. Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 2, common portions are denoted by the same reference numerals and description thereof is omitted.

図６（ａ）に示すように、本形態の照明装置８を備えた液晶装置１００は、液晶パネル１０の画像表示領域の対角が３．５インチであり、３２０×４８０の画素数を有している。また、導光板８０のサイズは５１ｍｍ×７５ｍｍ、厚みは１ｍｍである。本形態において、照明装置８の導光板８０は、実施の形態２に係る導光板８０から導光板部８１の数を６枚に減らした構成を有している。かかる照明装置８を備えた液晶装置１００は、ＴＶ等の動画を表示する際、横長で用いられる。かかる横長の状態で、本形態の照明装置８では、矢印ＳＹで示すように、画面の上側から下側に向けてバックライトがスキャンされることになり、液晶パネル１０における走査方向と同一である。従って、動画を表示した際の残像等を緩和することができるとともに、ローカルディミングの効果を得ることもできる。   As shown in FIG. 6A, the liquid crystal device 100 provided with the illumination device 8 of the present embodiment has a diagonal of the image display area of the liquid crystal panel 10 of 3.5 inches, and has 320 × 480 pixels. doing. The light guide plate 80 has a size of 51 mm × 75 mm and a thickness of 1 mm. In this embodiment, the light guide plate 80 of the lighting device 8 has a configuration in which the number of light guide plate portions 81 is reduced to six from the light guide plate 80 according to the second embodiment. The liquid crystal device 100 provided with the illumination device 8 is used in landscape orientation when displaying a moving image such as a TV. In such a horizontally long state, in the illumination device 8 of the present embodiment, as indicated by the arrow SY, the backlight is scanned from the upper side to the lower side of the screen, which is the same as the scanning direction in the liquid crystal panel 10. . Therefore, afterimages and the like when displaying a moving image can be reduced, and the effect of local dimming can be obtained.

かかる構成の場合、図６（ｂ）に示すように、液晶装置１００を９０°回転させて縦長にすると、矢印ＳＸで示すように、画面の左側から右側に向けてバックライトをスキャンすることになる。このような場合でも、縦型の画像は、文字情報等を静止画で表示することが多いため、画面の左側から右側に向けてバックライトをスキャンすることになっても、残像等の問題が発生しにくい。   In the case of such a configuration, as shown in FIG. 6B, when the liquid crystal device 100 is rotated 90 degrees to be vertically long, the backlight is scanned from the left side to the right side of the screen as indicated by an arrow SX. Become. Even in such a case, since a vertical image often displays character information or the like as a still image, even if the backlight is scanned from the left side to the right side of the screen, there are problems such as afterimages. Hard to occur.

［実施の形態１〜３の変形例１］
図７は、本発明の実施の形態１〜３の変形例１に係る照明装置８の断面構成を示す説明図である。なお、本形態の基本的な構成は、実施の形態１〜３と同様であるため、共通する部分には同一の符号を付して、それらの説明を省略する。 [Modification 1 of Embodiments 1 to 3]
FIG. 7 is an explanatory diagram showing a cross-sectional configuration of the illumination device 8 according to the first modification of the first to third embodiments of the present invention. In addition, since the basic composition of this form is the same as that of Embodiment 1-3, the same code | symbol is attached | subjected to a common part and those description is abbreviate | omitted.

実施の形態１〜３では、複数の導光板部８１は各々が、独立した樹脂板からなり、側辺８１３および斜辺８１４に相当する端面の全面を光散乱面８２１としたが、本形態では、図７（ａ）に示すように、隣り合う導光板部８１の間８２では、導光板８０の厚さ方向における一部に光散乱面８２１が設けられ、他の一部に反射面８２２が設けられている。本形態では、隣り合う導光板部８１の間８２では、光出射面８５から導光板８０の厚さ方向における約１／３が光散乱面８２１になっており、残りの約２／３が反射面８２２になっている。かかる反射面８２２は、アルミニウム等の反射層を設けた構成や、導光板部８１の端面の一部を鏡面とした構成によって実現することができる。なお、反射面８２２は、例えば、光出射面８５の側に設けてもよく、また、導光板８０の厚さ方向の途中位置に設けてもよい。   In the first to third embodiments, each of the plurality of light guide plate portions 81 is made of an independent resin plate, and the entire end surface corresponding to the side 813 and the hypotenuse 814 is the light scattering surface 821, but in this embodiment, As shown in FIG. 7A, between the adjacent light guide plate portions 81, a light scattering surface 821 is provided in a part in the thickness direction of the light guide plate 80, and a reflection surface 822 is provided in the other part. It has been. In this embodiment, in the space 82 between the adjacent light guide plate portions 81, about 1/3 in the thickness direction of the light guide plate 80 from the light emitting surface 85 is the light scattering surface 821, and the remaining about 2/3 is reflected. A surface 822 is formed. Such a reflective surface 822 can be realized by a configuration in which a reflective layer such as aluminum is provided or a configuration in which a part of the end surface of the light guide plate portion 81 is a mirror surface. In addition, the reflective surface 822 may be provided on the light emitting surface 85 side, for example, or may be provided in the middle of the light guide plate 80 in the thickness direction.

かかる構成によれば、光散乱面８２１および反射面８２２が占める割合を調整することによって、導光板部８１から光散乱面８２１を介して隣りの導光板部８１に漏れる光量と、反射面８２２で反射して導光板部８１に戻る光量を調整することができる。例えば、導光板部８１から光散乱面８２１を介して隣りの導光板部８１に対して、１０画素から２０画素に相当する領域まで漏れた光を到達させることができる。従って、隣り合う導光板部８１の間８２（境界部分）において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部８１から出射される照明光の光量を最適化することができる。   According to this configuration, by adjusting the ratio of the light scattering surface 821 and the reflection surface 822, the amount of light leaking from the light guide plate portion 81 to the adjacent light guide plate portion 81 via the light scattering surface 821 and the reflection surface 822 The amount of light reflected and returned to the light guide plate portion 81 can be adjusted. For example, the leaked light can reach from the light guide plate part 81 to the adjacent light guide plate part 81 via the light scattering surface 821 to an area corresponding to 10 pixels to 20 pixels. Accordingly, it is possible to suppress a sudden change in the intensity of the illumination light emitted between the adjacent light guide plate portions 81 (boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81. can do.

なお、本形態では、隣り合う導光板部８１の間８２に光散乱面８２１および反射面８２２を設けるにあたって、Ｙ軸方向で隣り合う導光板部８１の双方に光散乱面８２１および反射面８２２を形成したが、一方の導光板部８１に光散乱面８２１および反射面８２２を設けてもよい。かかる構成では、Ｙ軸方向で隣り合う導光板部８１の間で光散乱面８２１および反射面８２２を兼用した構成となるので、隣り合う導光板部８１の双方に光散乱面８２１および反射面８２２を設けた場合と同様な効果を得ることができる。その際、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１に光散乱面８２１を設け、他方の導光板部８１に反射面８２２を設ければ、導光板８０の製造工程を簡素化することができる。   In this embodiment, when the light scattering surface 821 and the reflection surface 822 are provided between the adjacent light guide plate portions 81, the light scattering surface 821 and the reflection surface 822 are provided on both the light guide plate portions 81 adjacent in the Y-axis direction. Although formed, the light scattering surface 821 and the reflection surface 822 may be provided on one light guide plate portion 81. In such a configuration, since the light scattering surface 821 and the reflection surface 822 are shared between the light guide plate portions 81 adjacent in the Y-axis direction, the light scattering surface 821 and the reflection surface 822 are provided on both of the adjacent light guide plate portions 81. The same effect as that obtained by providing can be obtained. At this time, among the light guide plate portions 81 adjacent in the Y-axis direction, if the light scattering surface 821 is provided in one light guide plate portion 81 and the reflection surface 822 is provided in the other light guide plate portion 81, the light guide plate 80 is manufactured. The process can be simplified.

図７（ｂ）に示す導光板８０では、隣り合う導光板部８１の間８２では、導光板８０の厚さ方向における一部に光散乱面８２１が設けられ、他の一部に隙間８２３が設けられている。本形態では、隣り合う導光板部８１の間８２では、光出射面８５から導光板８０の厚さ方向における約１／２が隙間８２３になっており、残りの約１／２が光散乱面８２１になっている。かかる隙間８２３は、導光板部８１の端面に段部を設けることによって実現することができ、隙間８２３の内部は空気層になっている。なお、隙間８２３は、例えば、反射シート１８７が位置する側に設けてもよい。   In the light guide plate 80 shown in FIG. 7B, a light scattering surface 821 is provided in a part of the light guide plate 80 in the thickness direction between the adjacent light guide plate parts 81, and a gap 823 is provided in the other part. Is provided. In this embodiment, between the adjacent light guide plate portions 81, about ½ in the thickness direction of the light guide plate 80 from the light emitting surface 85 is a gap 823, and the remaining about ½ is a light scattering surface. 821. The gap 823 can be realized by providing a stepped portion on the end surface of the light guide plate portion 81, and the inside of the gap 823 is an air layer. Note that the gap 823 may be provided on the side where the reflection sheet 187 is located, for example.

かかる構成によれば、導光板部８１の端面と隙間８２３内の空気層との界面で反射が発生するとともに、一部の光は隙間８２３を介して隣りの導光板部８１に入射する。従って、光散乱面８２１および隙間８２３が占める割合を調整することにより、導光板部８１から隣りの導光板部８１に漏れる光量と、導光板部８１の端面と隙間８２３内の空気層との界面で反射して導光板部８１に戻る光量を調整することができる。それ故、隣り合う導光板部８１の間８２（境界部分）において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部８１から出射される照明光の光量を最適化することができる。   According to this configuration, reflection occurs at the interface between the end face of the light guide plate portion 81 and the air layer in the gap 823, and part of the light enters the adjacent light guide plate portion 81 through the gap 823. Therefore, by adjusting the ratio of the light scattering surface 821 and the gap 823, the amount of light leaking from the light guide plate 81 to the adjacent light guide plate 81 and the interface between the end surface of the light guide plate 81 and the air layer in the gap 823 The amount of light reflected and returned to the light guide plate portion 81 can be adjusted. Therefore, it is possible to suppress a sudden change in the intensity of emitted illumination light between the adjacent light guide plate portions 81 (boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81. Can be

ここで、導光板部８１において隙間８２３となる部分は平坦面であることが好ましい。かかる構成によれば、光の反射を効率よく行うことができ、光の利用効率を高めることができる。また、隣り合う導光板部８１の間８２に光散乱面８２１および隙間８２３を設けるにあたって、Ｙ軸方向で隣り合う導光板部８１の双方に光散乱面８２１および隙間８２３を形成すべき切り欠きを形成したが、一方の導光板部８１に光散乱面８２１および切り欠き（隙間８２３）を設けてもよい。かかる構成では、Ｙ軸方向で隣り合う導光板部８１の間で光散乱面８２１および隙間８２３を兼用した構成となるので、隣り合う導光板部８１の双方に光散乱面８２１および隙間８２３を設けた場合と同様な効果を得ることができる。その際、Ｙ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１に光散乱面８２１を設け、他方の導光板部８１に切り欠き（隙間８２３）を設ければ、導光板８０の製造工程を簡素化することができる。   Here, it is preferable that the part which becomes the clearance gap 823 in the light-guide plate part 81 is a flat surface. According to such a configuration, it is possible to efficiently reflect light and to improve the light utilization efficiency. Further, when providing the light scattering surface 821 and the gap 823 between the adjacent light guide plate portions 81, notches in which the light scattering surface 821 and the gap 823 are to be formed in both of the light guide plate portions 81 adjacent in the Y-axis direction. Although formed, one of the light guide plate portions 81 may be provided with a light scattering surface 821 and a notch (gap 823). In such a configuration, since the light scattering surface 821 and the gap 823 are shared between the light guide plate portions 81 adjacent in the Y-axis direction, the light scattering surface 821 and the gap 823 are provided on both the adjacent light guide plate portions 81. The same effect as the case can be obtained. At that time, among the light guide plate portions 81 adjacent in the Y-axis direction, if the light scattering surface 821 is provided in one light guide plate portion 81 and the notch (gap 823) is provided in the other light guide plate portion 81, the light guide plate The manufacturing process of 80 can be simplified.

図７（ｃ）に示す導光板８０では、隣り合う導光板部８１の間８２の全体が隙間８２３になっている。かかる構成によれば、導光板部８１の端面と隙間８２３内の空気層との界面で反射が発生するとともに、一部の光は隙間８２３を介して隣りの導光板部８１に入射する。従って、導光板部８１から隣りの導光板部８１に漏れる光量と、導光板部８１の端面と隙間８２３内の空気層との界面で反射して導光板部８１に戻る光量を調整することができる。それ故、隣り合う導光板部８１の間８２（境界部分）において照明光の出射強度が急激に変化することを抑制することができるとともに、導光板部８１から出射される照明光の光量を最適化することができる。   In the light guide plate 80 shown in FIG. 7C, the entire space 82 between the adjacent light guide plate portions 81 is a gap 823. According to this configuration, reflection occurs at the interface between the end face of the light guide plate portion 81 and the air layer in the gap 823, and part of the light enters the adjacent light guide plate portion 81 through the gap 823. Therefore, the amount of light leaking from the light guide plate portion 81 to the adjacent light guide plate portion 81 and the amount of light reflected at the interface between the end surface of the light guide plate portion 81 and the air layer in the gap 823 and returning to the light guide plate portion 81 can be adjusted. it can. Therefore, it is possible to suppress a sudden change in the intensity of emitted illumination light between the adjacent light guide plate portions 81 (boundary portion), and to optimize the amount of illumination light emitted from the light guide plate portion 81. Can be

ここで、導光板部８１において隙間８２３となる部分は平坦面であることが好ましい。かかる構成によれば、光の反射を効率よく行うことができ、光の利用効率を高めることができる。また、隙間８２３を介してＹ軸方向で隣り合う導光板部８１のうち、一方の導光板部８１の端面に光散乱面を設け、他方の導光板部８１の端面を平坦面としてもよい。   Here, it is preferable that the part which becomes the clearance gap 823 in the light-guide plate part 81 is a flat surface. According to such a configuration, it is possible to efficiently reflect light and to improve the light utilization efficiency. Further, among the light guide plate portions 81 adjacent in the Y-axis direction via the gap 823, a light scattering surface may be provided on the end surface of one light guide plate portion 81, and the end surface of the other light guide plate portion 81 may be a flat surface.

［実施の形態１〜３の変形例２］
図８は、本発明の実施の形態１〜３の変形例２に係る照明装置の要部構成を示す説明図である。なお、本形態の基本的な構成は、実施の形態１〜３と同様であるため、共通する部分には同一の符号を付して図示し、それらの説明を省略する。 [Modification 2 of Embodiments 1 to 3]
FIG. 8 is an explanatory diagram showing a main configuration of the lighting apparatus according to Modification 2 of Embodiments 1 to 3 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiments 1 to 3, common portions are denoted by the same reference numerals and description thereof is omitted.

上記実施の形態１〜３では、導光板部８１の厚さが一定であったが、図８（ａ）、（ｂ）に示すように、複数の導光板部８１は、厚さ寸法が第１方向（長辺８１１および短辺８１２が対向する方向）で連続的に変化している構成を採用してもよい。ここで、図８（ａ）に示す導光板８０では、導光板部８１の厚さ寸法が長辺８１１の側から短辺８１２の側に向けて連続的に増大している。これに対して、図８（ｂ）に示す導光板８０では、導光板部８１の厚さ寸法が長辺８１１の側から短辺８１２の側に向けて連続的に減少している。   In the first to third embodiments, the thickness of the light guide plate portion 81 is constant. However, as shown in FIGS. 8A and 8B, the plurality of light guide plate portions 81 have a thickness dimension of the first. You may employ | adopt the structure which is changing continuously in one direction (direction where the long side 811 and the short side 812 oppose). Here, in the light guide plate 80 shown in FIG. 8A, the thickness dimension of the light guide plate portion 81 continuously increases from the long side 811 side toward the short side 812 side. On the other hand, in the light guide plate 80 shown in FIG. 8B, the thickness dimension of the light guide plate portion 81 continuously decreases from the long side 811 side toward the short side 812 side.

かかる構成のうち、図８（ａ）に示す構成の場合には、発光素子８９から出射された光源光が導光板部８１に入射した後、先端側まで十分な光量をもって到達しやすい。それ故、導光板部８１から出射される照明光の出射強度の均一化を図ることができるという利点がある。   In the configuration shown in FIG. 8A among such configurations, the light source light emitted from the light emitting element 89 is likely to reach the tip side with a sufficient amount of light after entering the light guide plate portion 81. Therefore, there is an advantage that the emission intensity of the illumination light emitted from the light guide plate portion 81 can be made uniform.

［他の実施の形態］
上記実施の形態において、導光板部８１は、長辺８１１および短辺８１２に対して直交する側辺８１３と、斜辺８１４とを備えていたが、２つの斜辺を備えた台形形状であってもよい。上記実施の形態において、第１方向における向きが逆の導光板部８１を第２方向で交互に配置したが、例えば、第１方向における向きが逆の導光板部８１を２つずつ第２方向に配置してもよい。 [Other embodiments]
In the above embodiment, the light guide plate 81 includes the side 813 and the hypotenuse 814 that are orthogonal to the long side 811 and the short side 812, but may have a trapezoidal shape with two hypotenuses. Good. In the above embodiment, the light guide plate portions 81 having the opposite directions in the first direction are alternately arranged in the second direction. For example, two light guide plate portions 81 having the opposite directions in the first direction are arranged in the second direction. You may arrange in.

［電子機器への搭載例］
次に、上述した実施形態に係る液晶装置１００を適用した電子機器について説明する。図９（ａ）に携帯電話機３０００の構成を示す。携帯電話機３０００は、複数の操作ボタン３００１、スクロールボタン３００２、および表示ユニットとしての液晶装置１００を備えている。スクロールボタン３００２を操作することによって、液晶装置１００に表示される画面がスクロールされる。図９（ｂ）に情報携帯端末４０００の構成を示す。情報携帯端末４０００は、複数の操作ボタン４００１、電源スイッチ４００２、および表示ユニットとしての液晶装置１００を備える。電源スイッチ４００２を操作すると、住所録やスケジュール帳といった各種の情報が表示される。 [Example of mounting on electronic devices]
Next, an electronic apparatus to which the liquid crystal device 100 according to the above-described embodiment is applied will be described. FIG. 9A shows the configuration of the mobile phone 3000. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the liquid crystal device 100 as a display unit. By operating the scroll button 3002, the screen displayed on the liquid crystal device 100 is scrolled. FIG. 9B shows the configuration of the portable information terminal 4000. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the liquid crystal device 100 as a display unit. When the power switch 4002 is operated, various kinds of information such as an address book and a schedule book are displayed.

なお、液晶装置１００が適用される電子機器としては、図９（ａ）、（ｂ）に示す電子機器の他、図９（ｃ）に示す液晶テレビ２０００や図９（ｄ）に示すパーソナルコンピューター１０００のディスプレイを例示することができる。また、図９に示す電子機器の他にも、カーナビゲーション装置、ページャー、電子手帳、電卓、ワードプロセッサー、ワークステーション、デジタルスチールカメラ、テレビ電話、ＰＯＳ端末等が挙げられ、これらの各種電子機器の表示部として、前述した液晶装置１００が適用可能である。   In addition, as an electronic device to which the liquid crystal device 100 is applied, in addition to the electronic devices shown in FIGS. 9A and 9B, a liquid crystal television 2000 shown in FIG. 9C and a personal computer shown in FIG. 9D. One thousand displays can be illustrated. In addition to the electronic devices shown in FIG. 9, there are car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, digital still cameras, videophones, POS terminals, and the like. As the unit, the above-described liquid crystal device 100 can be applied.

８・・照明装置、１０・・液晶パネル、８０・・導光板、８１・・導光板部、８５・・光出射面、８８・・光入射部、８９・・発光素子（光源）、１００・・液晶装置、８１１・・長辺（第２辺）、８１２・・短辺（第１辺）、８２１・・光散乱面、８２２・・反射面、８２３・・隙間。   8 .. Illumination device 10 .. Liquid crystal panel 80.. Light guide plate 81.. Light guide plate portion 85 .. Light exit surface 88 .. Light incident portion 89 .. Light emitting element (light source) 100. · Liquid crystal device, 811 ·· Long side (second side), 812 ·· Short side (first side), 821 · · Light scattering surface, 822 · · Reflecting surface, 823 · · Gap.

Claims (9)

照明装置と、該照明装置の光出射面の側に重ねて配置された液晶パネルと、を有する液晶装置であって、
前記照明装置は、
前記光出射面の面内方向で互いに交差する第１方向および第２方向のうち、前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺と、前記第１方向に延在して前記第１辺の一方の端部と前記第２辺の一方の端部とを結ぶ斜辺と、前記第１辺および前記第２辺に対して直交するように延在して前記第１辺の他方の端部と前記第２辺の他方の端部とを結ぶ側辺とを有する平面形状であって、各々が独立している導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、
複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、
前記液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、
を有し、
複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に光散乱面が設けられ、他の一部に反射面が設けられていることを特徴とする液晶装置。 A liquid crystal device comprising: an illuminating device; and a liquid crystal panel disposed on the light emitting surface side of the illuminating device,
The lighting device includes:
Of the first direction and the second direction intersecting each other in the in-plane direction of the light emitting surface, the first side facing in the first direction, the second side longer than the length of the first side, and the first A hypotenuse that extends in a direction and connects one end of the first side and one end of the second side, and extends perpendicular to the first side and the second side. A light guide plate portion having a side shape connecting the other end portion of the first side and the other end portion of the second side, each of which is independent in the second direction. A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other between adjacent light guide plate parts;
A plurality of light emitting elements for causing light source light to enter the light guide plate portion from the end face of the first side in each of the plurality of light guide plate portions;
A light source driving unit that selectively drives the plurality of light emitting elements in conjunction with driving the liquid crystal panel, and controls the amount of illumination light emitted from the light emitting surface for each of the plurality of light guide plate units;
Have,
Among the light guide plate portions, between the adjacent light guide plate portions, a light scattering surface is provided in a part of the light guide plate portion in the thickness direction, and a reflection surface is provided in the other part . A liquid crystal device characterized by that. 照明装置と、該照明装置の光出射面の側に重ねて配置された液晶パネルと、を有する液晶装置であって、  A liquid crystal device comprising: an illuminating device; and a liquid crystal panel disposed on the light emitting surface side of the illuminating device,
前記照明装置は、  The lighting device includes:
前記光出射面の面内方向で互いに交差する第１方向および第２方向のうち、前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺と、前記第１方向に延在して前記第１辺の一方の端部と前記第２辺の一方の端部とを結ぶ斜辺と、前記第１辺および前記第２辺に対して直交するように延在して前記第１辺の他方の端部と前記第２辺の他方の端部とを結ぶ側辺とを有する平面形状であって、各々が独立している導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、  Of the first direction and the second direction intersecting each other in the in-plane direction of the light emitting surface, the first side facing in the first direction, the second side longer than the length of the first side, and the first A hypotenuse that extends in a direction and connects one end of the first side and one end of the second side, and extends perpendicular to the first side and the second side. A light guide plate portion having a side shape connecting the other end portion of the first side and the other end portion of the second side, each of which is independent in the second direction. A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other between adjacent light guide plate parts;
複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、  A plurality of light emitting elements for causing light source light to enter the light guide plate portion from the end face of the first side in each of the plurality of light guide plate portions;
前記液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、  A light source driving unit that selectively drives the plurality of light emitting elements in conjunction with driving the liquid crystal panel, and controls the amount of illumination light emitted from the light emitting surface for each of the plurality of light guide plate units;
を有し、  Have
複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に光散乱面が設けられ、他の一部には隙間が設けられていることを特徴とする液晶装置。  Among the plurality of light guide plate portions, between the adjacent light guide plate portions, a light scattering surface is provided in a part in the thickness direction of the light guide plate part, and a gap is provided in the other part. A liquid crystal device characterized by that. 前記導光板部は、前記第１辺と前記第２辺とが平行な台形の平面形状を有していることを特徴とする請求項１または２に記載の液晶装置。 The light guide plate unit, a liquid crystal device according to claim 1 or 2, characterized in that said first side and said second side has a parallel trapezoidal shape in plan view. 複数の前記導光板部は、厚さ寸法が前記第１方向で連続的に変化していることを特徴とする請求項１乃至３の何れか一項に記載の液晶装置。 A plurality of the light guide plate unit, a liquid crystal device according to any one of claims 1 to 3, characterized in that the thickness is continuously changed in the first direction. 複数の前記導光板部は、厚さ寸法が前記第２辺の側から前記第１辺の側に向けて増大していることを特徴とする請求項４に記載の液晶装置。 5. The liquid crystal device according to claim 4 , wherein the plurality of light guide plate portions have a thickness dimension increasing from the second side toward the first side. 複数の前記導光板部は、隣り合う導光板部のいずれにおいても、前記第１辺と前記第２辺とが隣り合うように配列されていることを特徴とする請求項１乃至５の何れか一項に記載の液晶装置。 The plurality of the light guide plate unit, in any of the light guide plate part adjacent even any one of claims 1 to 5, characterized in that said first side and said second side are arranged so as to be adjacent The liquid crystal device according to one item. 請求項１乃至６の何れか一項に記載の液晶装置を表示部に備えていることを特徴とする電子機器。 An electronic apparatus characterized by comprising a display unit of the liquid crystal device according to any one of claims 1 to 6. 光出射面の面内方向で互いに交差する第１方向および第２方向のうち、少なくとも前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺と、前記第１方向に延在して前記第１辺の一方の端部と前記第２辺の一方の端部とを結ぶ斜辺と、前記第１辺および前記第２辺に対して直交するように延在して前記第１辺の他方の端部と前記第２辺の他方の端部とを結ぶ側辺とを有する平面形状であって、各々が独立している導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、
複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、
液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、
を有し、
複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に光散乱面が設けられ、他の一部に反射面が設けられていることを特徴とする照明装置。 Of the first direction and the second direction intersecting each other in the in-plane direction of the light emitting surface, at least a first side facing in the first direction, a second side longer than the length of the first side, and the first A hypotenuse that extends in a direction and connects one end of the first side and one end of the second side, and extends perpendicular to the first side and the second side. A light guide plate portion having a side shape connecting the other end portion of the first side and the other end portion of the second side, each of which is independent in the second direction. A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other between adjacent light guide plate parts;
A plurality of light emitting elements for causing light source light to enter the light guide plate portion from the end face of the first side in each of the plurality of light guide plate portions;
A light source driving unit that selectively drives the plurality of light emitting elements in conjunction with driving of the liquid crystal panel, and controls the amount of illumination light emitted from the light emitting surface for each of the plurality of light guide plate units;
Have,
Among the light guide plate portions, between the adjacent light guide plate portions, a light scattering surface is provided in a part of the light guide plate portion in the thickness direction, and a reflection surface is provided in the other part . A lighting device characterized by that. 光出射面の面内方向で互いに交差する第１方向および第２方向のうち、少なくとも前記第１方向で対向する第１辺と該第１辺の長さよりも長い第２辺と、前記第１方向に延在して前記第１辺の一方の端部と前記第２辺の一方の端部とを結ぶ斜辺と、前記第１辺および前記第２辺に対して直交するように延在して前記第１辺の他方の端部と前記第２辺の他方の端部とを結ぶ側辺とを有する平面形状であって、各々が独立している導光板部を、前記第２方向で隣り合う導光板部同士において前記第１辺と前記第２辺とが隣り合うように複数配列させた導光板と、  Of the first direction and the second direction intersecting each other in the in-plane direction of the light emitting surface, at least a first side facing in the first direction, a second side longer than the length of the first side, and the first A hypotenuse that extends in a direction and connects one end of the first side and one end of the second side, and extends perpendicular to the first side and the second side. A light guide plate portion having a side shape connecting the other end portion of the first side and the other end portion of the second side, each of which is independent in the second direction. A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other between adjacent light guide plate parts;
複数の前記導光板部の各々において前記第１辺の端面から当該導光板部内に光源光を入射させる複数の発光素子と、  A plurality of light emitting elements for causing light source light to enter the light guide plate portion from the end face of the first side in each of the plurality of light guide plate portions;
液晶パネルに対する駆動に連動して前記複数の発光素子を選択的に駆動し、前記光出射面からの照明光の出射光量を前記複数の導光板部毎に制御する光源駆動部と、  A light source driving unit that selectively drives the plurality of light emitting elements in conjunction with driving of the liquid crystal panel, and controls the amount of illumination light emitted from the light emitting surface for each of the plurality of light guide plate units;
を有し、  Have
複数の前記導光板部のうち、隣り合う導光板部の間には、該導光板部の厚さ方向における一部に光散乱面が設けられ、他の一部には隙間が設けられていることを特徴とする照明装置。  Among the plurality of light guide plate portions, between the adjacent light guide plate portions, a light scattering surface is provided in a part in the thickness direction of the light guide plate part, and a gap is provided in the other part. A lighting device characterized by that.
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