JP2018181809A - Lighting device, display device and television receiver device - Google Patents

Lighting device, display device and television receiver device Download PDF

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JP2018181809A
JP2018181809A JP2017084689A JP2017084689A JP2018181809A JP 2018181809 A JP2018181809 A JP 2018181809A JP 2017084689 A JP2017084689 A JP 2017084689A JP 2017084689 A JP2017084689 A JP 2017084689A JP 2018181809 A JP2018181809 A JP 2018181809A
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light source
led
light
led group
group
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JP6920867B2 (en
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裕貴 大川
Yuki Okawa
裕貴 大川
健太郎 鎌田
Kentaro Kamata
健太郎 鎌田
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Sharp Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To suppress temperature rise of a light source group and reduce manufacturing cost.SOLUTION: A backlight device 12 includes: a light guide plate 19 having an incident light end face 19a in which light enters at least part of an outer peripheral end face; a plurality of LEDs 17 aligned in a row along the incident light end face 19a; a plurality of LED groups 31 each constituted of LEDs 17 continuously aligned of the LEDs 17; and an LED control part 26 for controlling the LED groups 31 to drive so as to selectively include a luminance controlled LED group 34 of which maximum luminance is controlled in the LED groups 31.SELECTED DRAWING: Figure 7

Description

本発明は、照明装置、表示装置及びテレビ受信装置に関する。   The present invention relates to a lighting device, a display device and a television receiver.

従来の液晶表示装置に用いられるバックライト装置の一例として下記特許文献１に記載されたものが知られている。この特許文献１には、一個の基板上に、複数の半導体発光素子を並列接続して構成した発光素子ブロックを複数個設け、前記複数の発光素子ブロックを直列接続して構成する半導体発光装置（バックライト装置）において、前記基板上の直列接続配置の中央に位置する発光素子ブロックを構成する発光素子の数が、他の発光素子ブロックを構成する発光素子の数より多くしたものが記載されている。   What was described in the following patent document 1 as an example of the backlight apparatus used for the conventional liquid crystal display device is known. In this patent document 1, there is provided a plurality of light emitting element blocks formed by connecting a plurality of semiconductor light emitting elements in parallel on a single substrate, and a semiconductor light emitting device formed by connecting the plurality of light emitting element blocks in series In the backlight device, the number of light emitting elements forming the light emitting element block positioned at the center of the series connection arrangement on the substrate is set to be larger than the number of light emitting elements forming the other light emitting element blocks There is.

特許第５５４５８４８号公報Patent No. 5545848 gazette

上記した特許文献１に記載された半導体発光装置では、基板上の直列接続配置の中央に位置する発光素子ブロックを構成する発光素子の数を多くすることで、上記中央に位置する発光素子ブロックを構成する各発光素子の電流を減少させ、もって各発光素子の発熱量を減少させている。しかしながら、発光素子の数が互いに異なる複数種類の発光素子ブロックを備える特殊な構造となるため、製造コストが高くなるなどの問題があった。   In the semiconductor light emitting device described in Patent Document 1 described above, the light emitting element block positioned at the center is configured by increasing the number of light emitting elements forming the light emitting element block positioned at the center of the series connection arrangement on the substrate. The current of each light emitting element to be configured is decreased, thereby reducing the amount of heat generation of each light emitting element. However, since it has a special structure including a plurality of types of light emitting element blocks in which the number of light emitting elements are different from each other, there is a problem such as an increase in manufacturing cost.

本発明は上記のような事情に基づいて完成されたものであって、光源群の温度上昇を抑制するとともに、製造コストを低下させることを目的とする。   The present invention has been completed based on the above circumstances, and it is an object of the present invention to suppress the temperature rise of the light source group and to reduce the manufacturing cost.

本発明の照明装置は、外周端面の少なくとも一部に光が入射される入光端面を有する導光板と、前記入光端面に沿って一列に並ぶ複数の光源と、複数の前記光源のうち、連続して並ぶ複数ずつの前記光源からなる複数の光源群と、複数の前記光源群に最大輝度が制限された輝度制限光源群が選択的に含まれるよう、複数の前記光源群の駆動を制御する光源制御部と、を備える。   In the illumination device according to the present invention, a light guide plate having an incident end face on which light is incident on at least a part of an outer peripheral end face, a plurality of light sources arranged in a line along the incident end face, and a plurality of the light sources The drive of the plurality of light source groups is controlled such that a plurality of light source groups consisting of the plurality of light sources arranged in series and a luminance limited light source group whose maximum luminance is limited is selectively included in the plurality of light source groups And a light source control unit.

このようにすれば、光源制御部によって複数の光源群の駆動を制御することで、複数の光源群に含まれる複数ずつの光源がそれぞれ発光される。複数の光源から発せられた光は、導光板の入光端面に入射された後に導光板から出射される。光源制御部は、複数の光源群に含まれる特定の光源群である輝度制限光源群について最大輝度を制限しているから、その輝度制限光源群付近に生じる温度上昇を抑制することができる。これにより、温度上昇に伴う光源の劣化や故障の発生が生じ難くなる。その上で、従来のように発光素子の数が互いに異なる複数種類の発光素子ブロックを備える場合に比べると、光源に係る構成を特殊なものとする必要がなく、製造コストを低く抑える上で好適となる。   According to this configuration, the plurality of light sources included in the plurality of light source groups are respectively emitted by controlling the driving of the plurality of light source groups by the light source control unit. The light emitted from the plurality of light sources is emitted from the light guide plate after being incident on the light entrance end face of the light guide plate. Since the light source control unit limits the maximum luminance of the luminance limited light source group which is a specific light source group included in the plurality of light source groups, it is possible to suppress a temperature rise occurring in the vicinity of the luminance restricted light source group. As a result, the deterioration of the light source due to the temperature rise and the occurrence of the failure hardly occur. In addition, it is not necessary to make the configuration relating to the light source special as compared with the case where a plurality of types of light emitting element blocks having different numbers of light emitting elements from each other as in the prior art is provided. It becomes.

本発明によれば、光源群の温度上昇を抑制するとともに、製造コストを低下させることができる。   According to the present invention, it is possible to suppress the temperature rise of the light source group and to reduce the manufacturing cost.

本発明の実施形態１に係るテレビ受信装置の概略構成を示す分解斜視図The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention 液晶表示装置の断面図Cross section of liquid crystal display 液晶表示装置を構成するバックライト装置の平面図Top view of backlight device constituting liquid crystal display device 図２のＡ−Ａ線断面図A-A line sectional view of FIG. 2 液晶表示装置の電気的構成を表すブロック図Block diagram showing the electrical configuration of the liquid crystal display device 各ＬＥＤ群の電気的な接続構成を表す回路図Circuit diagram showing the electrical connection configuration of each LED group 各ＬＥＤ群の最大輝度値を示す表Table showing the maximum luminance value of each LED group 液晶パネルの中央位置に面積比率１０％の白画像を表示した状態を示す図A diagram showing a state in which a white image with an area ratio of 10% is displayed at the center position of the liquid crystal panel 液晶パネルの中央位置に面積比率１０％の白画像を表示したときの各ＬＥＤ群の輝度値を示す表Table showing the luminance value of each LED group when a white image with an area ratio of 10% is displayed at the center position of the liquid crystal panel 液晶パネルの中央位置よりも右寄り位置に面積比率１０％の白画像を表示した状態を示す図A diagram showing a state in which a white image with an area ratio of 10% is displayed at a position to the right of the center position of the liquid crystal panel 液晶パネルの中央位置よりも右寄り位置に面積比率１０％の白画像を表示したときの各ＬＥＤ群の輝度値を示す表A table showing the luminance values of the respective LED groups when a white image with an area ratio of 10% is displayed on the right of the center position of the liquid crystal panel 液晶パネルの右端寄り位置に面積比率１０％の白画像を表示した状態を示す図A diagram showing a state in which a white image with an area ratio of 10% is displayed near the right end of the liquid crystal panel 液晶パネルの右端寄り位置に面積比率１０％の白画像を表示したときの各ＬＥＤ群の輝度値を示す表Table showing the luminance value of each LED group when a white image with an area ratio of 10% is displayed at the position near the right end of the liquid crystal panel 本発明の実施形態２に係る液晶表示装置を構成するバックライト装置の断面図Sectional drawing of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 2 of this invention

＜実施形態１＞
本発明の実施形態１を図１から図１３によって説明する。本実施形態では、液晶表示装置１０及びそれを用いたテレビ受信装置１０ＴＶについて例示する。なお、各図面の一部にはＸ軸、Ｙ軸及びＺ軸を示しており、各軸方向が各図面で示した方向となるように描かれている。また、図２及び図４などに示す上側を表側とし、同図下側を裏側とする。 First Embodiment
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 13. In the present embodiment, a liquid crystal display device 10 and a television receiver 10TV using the same will be exemplified. In addition, X-axis, Y-axis, and Z-axis are shown in a part of each drawing, and it is drawn so that each axis direction may turn into the direction shown in each drawing. Moreover, let the upper side shown to FIG.2 and FIG.4 etc. be front side, and let the lower side of the figure be a back side.

本実施形態に係るテレビ受信装置１０ＴＶは、図１に示すように、全体として横長の略方形状をなす液晶表示装置１０と、当該液晶表示装置１０を挟むようにして収容する表裏両キャビネット１０Ｃａ，１０Ｃｂと、電源１０Ｐと、テレビ信号を受信するチューナー（受信部）１０Ｔと、スタンド１０Ｓと、を備えて構成される。液晶表示装置１０は、図２に示すように、画像を表示する液晶パネル（表示パネル）１１と、液晶パネル１１に表示のための光を供給するバックライト装置（照明装置）１２と、を備え、これらが枠状のベゼル１３などにより一体的に保持される。本実施形態に係る液晶表示装置１０は、液晶パネル１１の画面サイズが例えば６０インチ以上とされ、一般的には大型または超大型に分類される。   The television receiver 10TV according to the present embodiment, as shown in FIG. 1, has a liquid crystal display 10 having a substantially rectangular shape as a whole as a whole and front and back cabinets 10Ca and 10Cb that house the liquid crystal display 10 in a sandwiching manner. , A power supply 10P, a tuner (reception unit) 10T for receiving a television signal, and a stand 10S. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 for displaying an image, and a backlight device (illumination device) 12 for supplying light for display to the liquid crystal panel 11. These are integrally held by the frame-like bezel 13 or the like. In the liquid crystal display device 10 according to the present embodiment, the screen size of the liquid crystal panel 11 is, for example, 60 inches or more, and is generally classified into large size or super large size.

液晶パネル１１は、図２に示すように、一対のガラス基板が所定のギャップを隔てた状態で貼り合わせられるとともに、両ガラス基板間に電界印加に伴って光学特性が変化する物質である液晶分子を含む液晶層（図示せず）が封入された構成とされる。一方のガラス基板（アレイ基板、アクティブマトリクス基板）の内面側には、互いに直交するソース配線とゲート配線とに接続されたスイッチング素子（例えばＴＦＴ）と、ソース配線とゲート配線とに囲まれた方形状の領域に配されてスイッチング素子に接続される画素電極と、がマトリクス状に平面配置される他、配向膜等が設けられている。他方のガラス基板（対向基板、ＣＦ基板）の内面側には、Ｒ（赤色），Ｇ（緑色），Ｂ（青色）等の各着色部が所定配列でマトリクス状に平面配置されたカラーフィルタが設けられる他、各着色部間に配されて格子状をなす遮光層（ブラックマトリクス）、画素電極と対向状をなすベタ状の対向電極、配向膜等が設けられている。なお、両ガラス基板の外面側には、それぞれ偏光板が配されている。また、液晶パネル１１における長辺方向がＸ軸方向と一致し、短辺方向がＹ軸方向と一致し、さらに厚さ方向がＺ軸方向と一致している。   As shown in FIG. 2, the liquid crystal panel 11 is a substance in which a pair of glass substrates are bonded with a predetermined gap therebetween, and liquid crystal molecules whose optical characteristics change with the application of an electric field between the two glass substrates. And a liquid crystal layer (not shown) containing the liquid crystal is enclosed. On the inner surface side of one glass substrate (array substrate, active matrix substrate), a switching element (for example, TFT) connected to source wiring and gate wiring orthogonal to each other, and one surrounded by source wiring and gate wiring In addition to the planar arrangement of the pixel electrodes arranged in the area of the shape and connected to the switching elements in a matrix, an alignment film and the like are provided. On the inner surface side of the other glass substrate (opposite substrate, CF substrate), there is a color filter in which colored portions such as R (red), G (green), B (blue), etc. Besides being provided, a grid-like light shielding layer (black matrix) disposed between the colored portions, a solid counter electrode facing the pixel electrode, an alignment film, and the like are provided. In addition, the polarizing plate is each distribute | arranged to the outer surface side of both glass substrates. The long side direction of the liquid crystal panel 11 coincides with the X axis direction, the short side direction coincides with the Y axis direction, and the thickness direction coincides with the Z axis direction.

バックライト装置１２は、図２及び図３に示すように、表側（液晶パネル１１側）に向けて開口する光出射部１４ｂを有した略箱型をなすシャーシ（筐体）１４と、シャーシ１４の光出射部（開口部）１４ｂを覆う形で配される光学部材（光学シート）１５と、光学部材１５を裏側から支持するフレーム１６と、を備える。さらに、シャーシ１４内には、光源であるＬＥＤ（Light Emitting Diode：発光ダイオード）１７と、ＬＥＤ１７が実装されたＬＥＤ基板（光源基板）１８と、ＬＥＤ１７からの光を導光して光学部材１５（液晶パネル１１）へと導く導光板１９と、導光板１９の裏側に積層配置される反射シート２０と、ＬＥＤ基板１８に接する形で配される放熱部材２１と、が備えられる。そして、このバックライト装置１２は、その短辺方向（Ｙ軸方向）についての片方の端部にＬＥＤ基板１８が配されており、ＬＥＤ１７からの光が導光板１９に対して片側から入光される片側入光タイプのエッジライト型（サイドライト型）とされる。続いて、バックライト装置１２の各構成部品について詳しく説明する。   As shown in FIGS. 2 and 3, the backlight device 12 has a substantially box-shaped chassis (housing) 14 having a light emitting portion 14 b opening toward the front side (the liquid crystal panel 11 side), and the chassis 14. And a frame 16 for supporting the optical member 15 from the rear side. Furthermore, in the chassis 14, an LED (Light Emitting Diode: light emitting diode) 17 as a light source, an LED substrate (light source substrate) 18 on which the LED 17 is mounted, and light from the LED 17 are guided to A light guide plate 19 leading to the liquid crystal panel 11), a reflection sheet 20 stacked on the back side of the light guide plate 19, and a heat dissipation member 21 disposed in contact with the LED substrate 18 are provided. The backlight device 12 has the LED board 18 at one end in the short side direction (Y-axis direction), and light from the LED 17 is incident on the light guide plate 19 from one side. Edge light type (side light type). Subsequently, each component of the backlight device 12 will be described in detail.

シャーシ１４は、金属製とされ、図２及び図３に示すように、液晶パネル１１と同様に横長の略方形状をなす底部１４ａと、底部１４ａの各辺の外端からそれぞれ立ち上がる側部１４ｃと、からなり、全体としては表側に向けて開口した浅い略箱型をなしている。シャーシ１４（底部１４ａ）は、その長辺方向がＸ軸方向（水平方向）と一致し、短辺方向がＹ軸方向（鉛直方向）と一致している。また、側部１４ｃには、フレーム１６及びベゼル１３が固定可能とされる。   The chassis 14 is made of metal, and as shown in FIG. 2 and FIG. 3, like the liquid crystal panel 11, the bottom portion 14a having a substantially rectangular shape and a side portion 14c rising from the outer end of each side of the bottom portion 14a. And consists of a shallow box-like shape that is open toward the front as a whole. The long side direction of the chassis 14 (bottom portion 14a) coincides with the X axis direction (horizontal direction), and the short side direction coincides with the Y axis direction (vertical direction). Further, the frame 16 and the bezel 13 can be fixed to the side portion 14c.

光学部材１５は、図２に示すように、シャーシ１４の光出射部１４ｂを覆うとともに、液晶パネル１１と導光板１９との間に介在する形で配されることで、導光板１９からの出射光を透過するとともにその透過光に所定の光学作用を付与しつつ液晶パネル１１に向けて出射させる。光学部材１５は、複数枚（本実施形態では３枚）が備えられ、その具体的な種類としては、例えば拡散シート、レンズシート（プリズムシート）、反射型偏光シートなどがあり、これらの中から適宜に選択して使用することが可能である。   The optical member 15 covers the light emitting portion 14b of the chassis 14 and is disposed between the liquid crystal panel 11 and the light guide plate 19 as shown in FIG. The transmitted light is transmitted, and the transmitted light is emitted toward the liquid crystal panel 11 while giving a predetermined optical action. The optical member 15 is provided with a plurality of sheets (three sheets in the present embodiment), and specific types thereof include, for example, a diffusion sheet, a lens sheet (prism sheet), a reflective polarizing sheet, and the like. It is possible to select and use appropriately.

フレーム１６は、図２に示すように、導光板１９及び光学部材１５の外周縁部に沿って延在する横長の枠状部１６ａを有している。この枠状部１６ａは、光学部材１５の外周縁部をほぼ全周にわたって裏側から受けて支持するとともに、導光板１９の外周縁部をほぼ全周にわたって表側から押さえて支持する。枠状部１６ａにおける一方の長辺部における裏側の面（導光板１９及びＬＥＤ１７）との対向面には、光を反射するフレーム側反射シート２２が取り付けられている。また、フレーム１６は、枠状部１６ａから表側に向けて突出し、液晶パネル１１における外周縁部を裏側から支持する液晶パネル支持部１６ｂを有している。   As shown in FIG. 2, the frame 16 has a horizontally elongated frame-shaped portion 16 a extending along the outer peripheral edge of the light guide plate 19 and the optical member 15. The frame-like portion 16a receives and supports the outer peripheral edge of the optical member 15 from the back side over substantially the entire circumference, and presses and supports the outer peripheral edge of the light guide plate 19 from the front side over substantially the entire circumference. A frame-side reflection sheet 22 that reflects light is attached to a surface of the frame-shaped portion 16 a that faces the surface (light guide plate 19 and LED 17) on the back side at one long side portion. Further, the frame 16 has a liquid crystal panel support portion 16 b which protrudes from the frame portion 16 a toward the front side and supports the outer peripheral edge portion of the liquid crystal panel 11 from the back side.

ＬＥＤ１７は、図２及び図３に示すように、ＬＥＤ基板１８に固着される基板部上にＬＥＤチップを封止材により封止した構成とされる。このＬＥＤ１７は、図示しないアノード端子及びカソード端子を有しており、これらの間に順バイアスとなる直流電流が流されることで、ＬＥＤチップが発光するようになっている。ＬＥＤ１７は、ＬＥＤチップが例えば青色光を単色発光するものとされ、封止材に蛍光体（黄色蛍光体、緑色蛍光体、赤色蛍光体など）が分散配合されることで全体として白色光を発する。ＬＥＤ１７は、自身の発光面１７ａとは反対側の面が次述するＬＥＤ基板１８に実装されており、いわゆる頂面発光型とされる。   As shown in FIG. 2 and FIG. 3, the LED 17 is configured such that the LED chip is sealed with a sealing material on a substrate portion fixed to the LED substrate 18. The LED 17 has an anode terminal and a cathode terminal (not shown), and a direct current, which becomes a forward bias, flows between them, so that the LED chip emits light. In the LED 17, the LED chip emits, for example, blue light as a single color, and phosphors (yellow phosphors, green phosphors, red phosphors, etc.) are dispersed and mixed in the sealing material to emit white light as a whole. . The surface of the LED 17 opposite to the light emitting surface 17a of the LED 17 is mounted on the LED substrate 18 described below, and is so-called top surface light emitting type.

ＬＥＤ基板１８は、図２及び図３に示すように、Ｘ軸方向（入光端面１９ａの長手方向）に沿って延在する板状をなしており、一対（２つ）がＸ軸方向に沿って隣り合う配置でもってシャーシ１４内に収容されている。ＬＥＤ基板１８は、複数のＬＥＤ１７が実装される実装面が次述する導光板１９の端面（入光端面１９ａ）と対向する形で配されるとともに、ＬＥＤ１７の実装面とは反対側の板面が放熱部材２１に接する形で取り付けられている。ＬＥＤ基板１８におけるＬＥＤ１７の実装面には、金属膜（銅箔など）からなり、各ＬＥＤ１７の端子などに接続される配線パターン（図示せず）が形成されている。なお、図２では、紙面の都合上、ＬＥＤ基板１８におけるＬＥＤ１７の設置数を実際よりも少なく図示しているが、実際には例えば各ＬＥＤ基板１８には１２８個ずつのＬＥＤ１７が実装されている。   As shown in FIGS. 2 and 3, the LED substrate 18 has a plate shape extending along the X-axis direction (longitudinal direction of the light incident end face 19 a), and a pair (two) thereof extend in the X-axis direction. They are housed within the chassis 14 in an adjacent arrangement along the same. The LED substrate 18 is disposed in such a manner that the mounting surface on which the plurality of LEDs 17 are mounted faces the end face (light incident end face 19a) of the light guide plate 19 described below, and the plate surface opposite to the mounting surface of the LED 17 Is mounted in contact with the heat dissipation member 21. On the mounting surface of the LED 17 in the LED substrate 18, a wiring pattern (not shown) made of a metal film (copper foil or the like) and connected to a terminal or the like of each LED 17 is formed. Although FIG. 2 illustrates the installation number of the LEDs 17 in the LED substrate 18 less than the actual number for convenience of the paper surface, in practice, for example, 128 LEDs 17 are mounted on each of the LED substrates 18. .

ＬＥＤ基板１８は、図２及び図４に示すように、Ｘ軸方向に沿って延在していて複数のＬＥＤ１７が実装されるＬＥＤ実装部（光源実装部）１８ａと、ＬＥＤ実装部１８ａからＺ軸方向に沿って裏側（放熱部２１ｂ側）に向けて突出する給電用突出部１８ｂと、を有してなる。ＬＥＤ実装部１８ａにおける導光板１９側を向いた実装面には、複数のＬＥＤ１７がＸ軸方向に沿って一定の間隔を空けて一列に並んだ形で実装されている。給電用突出部１８ｂにおける導光板１９側を向いた面には、ＬＥＤ１７に対する給電のための基板側コネクタ（給電接続部）２３が実装されている。給電用突出部１８ｂ及び基板側コネクタ２３は、ＬＥＤ基板１８においてＸ軸方向（ＬＥＤ１７の並び方向）について対称となる位置に一対ずつ配されている。これにより、バックライト装置１２に用いられる一対のＬＥＤ基板１８を共通構造とすることができるので、ＬＥＤ基板１８に係る製造コストを低下させる上で好適となる。給電用突出部１８ｂは、シャーシ１４の底部１４ａに開口形成された開口部１４ａ１など（後述する放熱部材２１の開口部２１ｂ１を含む）を通してシャーシ１４の裏側に突き出す形で配されており、シャーシ１４からの突出部分に基板側コネクタ２３が配置されている。基板側コネクタ２３には、図示しないＬＥＤ駆動回路基板に接続された配線部材（給電部材）２４の端末に設けられた配線側コネクタ（電源側接続部）２４ａが嵌合接続されている。   As shown in FIGS. 2 and 4, the LED substrate 18 extends along the X-axis direction and has a plurality of LED mounting units (light source mounting units) 18a mounted thereon, and the LED mounting units 18a to Z. And a power supply protrusion 18b protruding in the axial direction toward the back side (the heat radiation portion 21b side). On the mounting surface of the LED mounting portion 18 a facing the light guide plate 19, a plurality of LEDs 17 are mounted in a line at a predetermined distance along the X-axis direction. A board-side connector (feed connection portion) 23 for feeding power to the LED 17 is mounted on the face of the feed protrusion 18 b facing the light guide plate 19 side. The power supply protrusion 18 b and the board-side connector 23 are arranged in pairs in the LED board 18 at symmetrical positions with respect to the X-axis direction (the direction in which the LEDs 17 are arranged). As a result, the pair of LED substrates 18 used in the backlight device 12 can have a common structure, which is suitable for reducing the manufacturing cost of the LED substrate 18. The feeding protrusion 18b is disposed to protrude to the back side of the chassis 14 through the opening 14a1 (including the opening 21b1 of the heat radiation member 21 described later) formed in the bottom 14a of the chassis 14 and the chassis 14 The board side connector 23 is disposed at the protruding portion from the lower side. A wiring side connector (power supply side connecting portion) 24 a provided at a terminal of a wiring member (power feeding member) 24 connected to an LED drive circuit board (not shown) is fitted and connected to the substrate side connector 23.

導光板１９は、ほぼ透明な合成樹脂材料（例えばＰＭＭＡなどのアクリル樹脂やポリカーボネートなど）とされ、屈折率が空気よりも十分に高くなっている。導光板１９は、図２及び図３に示すように、液晶パネル１１などと同様に横長の板状をなしていてシャーシ１４によりその周りが取り囲まれた形で収容されるとともに、液晶パネル１１及び光学部材１５の直下位置に配されている。導光板１９は、その外周端面のうち一方（図２に示す左側）の長辺側の端面が、ＬＥＤ１７と対向状をなしていてＬＥＤ１７からの光が入射される入光端面（光源対向端面）１９ａとされる。導光板１９は、表裏一対の板面のうち、表側（液晶パネル１１側）を向いた板面が、光を液晶パネル１１に向けて出射させる出光板面１９ｂとされ、裏側を向いた板面が出光板面１９ｂとは反対側の出光反対板面１９ｃとされる。このような構成により、導光板１９は、ＬＥＤ１７からＹ軸方向に沿って発せられた光を入光端面１９ａから導入するとともに、その光を内部で伝播させた後にＺ軸方向に沿って立ち上げて出光板面１９ｂから光学部材１５側（表側、光出射側）へ向けて出射させる機能を有している。   The light guide plate 19 is made of a substantially transparent synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate), and the refractive index is sufficiently higher than air. As shown in FIGS. 2 and 3, the light guide plate 19 is in the form of a horizontally long plate like the liquid crystal panel 11 etc., and is housed in a form surrounded by the chassis 14. It is disposed directly below the optical member 15. The light guide plate 19 has an end face on the long side of one of the outer peripheral end faces (left side shown in FIG. 2) facing the LED 17 and a light entrance end face (light source facing end face) on which light from the LED 17 is incident. It is taken as 19a. In the light guide plate 19, a plate surface facing the front side (the liquid crystal panel 11 side) of the front and back pair of plate surfaces is a light emitting plate surface 19b for emitting light toward the liquid crystal panel 11, and a plate surface facing the back side Is a light exit counterplate surface 19c opposite to the light exit plate surface 19b. With such a configuration, the light guide plate 19 introduces the light emitted from the LED 17 along the Y-axis direction from the light incident end face 19a, propagates the light internally, and then rises up along the Z-axis direction. It has a function of emitting light from the light exit plate surface 19b toward the optical member 15 side (front side, light output side).

反射シート２０は、図３に示すように、導光板１９の出光反対板面１９ｃを覆う形で配される。反射シート２０は、光反射性に優れており、導光板１９の出光反対板面１９ｃから漏れた光を表側（出光板面１９ｂ側）に向けて効率的に立ち上げることができる。反射シート２０は、導光板１９よりも一回り大きな外形を有しており、その一方の長辺側の端部が入光端面１９ａよりもＬＥＤ１７側に突き出す形で配されている。   The reflection sheet 20 is disposed so as to cover the light emission opposite plate surface 19c of the light guide plate 19 as shown in FIG. The reflection sheet 20 is excellent in light reflectivity, and can efficiently raise the light leaked from the light emission opposite plate surface 19c of the light guide plate 19 toward the front side (the light emission plate surface 19b side). The reflection sheet 20 has an outer shape that is slightly larger than the light guide plate 19, and the end on one long side thereof is disposed so as to protrude toward the LED 17 than the light incident end face 19 a.

放熱部材２１は、例えばアルミニウムなどの熱伝導性に優れた金属製とされる。放熱部材２１は、図２及び図３に示すように、Ｘ軸方向に沿って延在していてその長さ寸法が導光板１９の長辺寸法と同等とされている。この放熱部材２１には、一対のＬＥＤ基板１８がＸ軸方向に沿って隣り合う形で並んだ状態で取り付けられている。放熱部材２１は、断面形状が略Ｌ字型をなしており、一対のＬＥＤ基板１８が取り付けられるＬＥＤ基板取付部（光源基板取付部）２１ａと、ＬＥＤ基板取付部２１ａにおける裏側の端部から導光板１９側に向けてＹ軸方向に沿って延出する放熱部２１ｂと、から構成される。ＬＥＤ基板取付部２１ａは、ＬＥＤ基板１８の板面に並行する板面を有しており、ＬＥＤ基板１８側とは反対側の板面がシャーシ１４の側部１４ｃに接する形で配されている。放熱部２１ｂは、導光板１９及びシャーシ１４の底部１４ａの板面に並行する板面を有しており、導光板１９側（反射シート２０側）とは反対側の板面がシャーシ１４の底部１４ａに接する形で配されている。放熱部２１ｂは、ＬＥＤ基板取付部２１ａに比べると、大きな面積を有しており、放熱部材２１において放熱機能を主体的に担う部位である。発光に伴って各ＬＥＤ１７から発せられた熱は、ＬＥＤ基板１８から放熱部材２１のＬＥＤ基板取付部２１ａ及び放熱部２１ｂに伝達された後にシャーシ１４の側部１４ｃ及び底部１４ａへと伝達されることで放散されるようになっている。放熱部２１ｂのうち、ＬＥＤ基板１８における給電用突出部１８ｂ及び基板側コネクタ２３と平面に視て重畳する部分には、給電用突出部１８ｂ及び基板側コネクタ２３を通すための開口部２１ｂ１が形成されている。この放熱部２１ｂの開口部２１ｂ１は、シャーシ１４の底部１４ａに形成された開口部１４ａ１と連通している。これらの開口部１４ａ１，２１ｂ１は、一対のＬＥＤ基板１８に一対ずつ設けられた給電用突出部１８ｂ及び基板側コネクタ２３と重畳する位置に合計４つ設けられている。   The heat dissipation member 21 is made of, for example, a metal having excellent thermal conductivity such as aluminum. As shown in FIGS. 2 and 3, the heat dissipating member 21 extends along the X-axis direction, and its length dimension is made equal to the long side dimension of the light guide plate 19. A pair of LED substrates 18 are attached to the heat dissipation member 21 in a state of being adjacent to each other along the X-axis direction. The heat dissipation member 21 has a substantially L-shaped cross section, and is led from the end of the LED substrate attachment portion (light source substrate attachment portion) 21a to which the pair of LED substrates 18 is attached and the rear side of the LED substrate attachment portion 21a. And a heat radiating portion 21b extending toward the light plate 19 along the Y-axis direction. The LED substrate mounting portion 21 a has a plate surface parallel to the plate surface of the LED substrate 18, and the plate surface opposite to the LED substrate 18 is disposed in contact with the side portion 14 c of the chassis 14. . The heat radiating portion 21 b has a plate surface parallel to the plate surface of the light guide plate 19 and the bottom portion 14 a of the chassis 14, and the plate surface on the opposite side to the light guide plate 19 side (reflection sheet 20 side) is the bottom portion of the chassis 14 It is arranged in contact with 14a. The heat radiating portion 21 b has a large area as compared with the LED substrate mounting portion 21 a, and is a portion that mainly plays a heat radiating function in the heat radiating member 21. Heat emitted from each LED 17 with light emission is transmitted from the LED substrate 18 to the LED substrate mounting portion 21a and the heat radiating portion 21b of the heat radiating member 21 and then to the side portion 14c and the bottom portion 14a of the chassis 14 Is to be dissipated. An opening 21b1 for passing the feed projecting portion 18b and the board side connector 23 is formed in a portion of the heat dissipation portion 21b which overlaps the feeding projection portion 18b and the board side connector 23 in the LED substrate 18 in plan view. It is done. The opening 21 b 1 of the heat radiating portion 21 b communicates with the opening 14 a 1 formed in the bottom 14 a of the chassis 14. A total of four openings 14a1 and 21b1 are provided at positions overlapping with the feeding projections 18b provided on the pair of LED substrates 18 and the substrate-side connector 23.

本実施形態に係る液晶表示装置１０は、図５に示すように、液晶パネル１１の駆動を制御するためのパネル制御部２５と、バックライト装置１２に備わるＬＥＤ１７の駆動を制御するためのＬＥＤ制御部（光源制御部）２６と、を少なくとも有している。パネル制御部２５は、映像信号を処理する映像信号処理回路部２７と、映像信号処理回路部２７からの出力信号に基づいて各画素を駆動する画素駆動部２８とを有しており、コントロール基板に設けられている。コントロール基板には、映像信号処理回路部２７、画素駆動部２８及び後述するＬＥＤ駆動部３０の動作をそれぞれ制御するＣＰＵ２９が設けられている。ＬＥＤ制御部２６は、映像信号処理回路部２７からの出力信号に基づいてＬＥＤ１７を駆動するＬＥＤ駆動部３０を有しており、ＬＥＤ駆動回路基板に設けられている。ＬＥＤ駆動部３０は、コントロール基板のＣＰＵ２９によって動作が制御されており、画素駆動部２８の動作と同期されるようになっている。   As shown in FIG. 5, the liquid crystal display device 10 according to the present embodiment includes a panel control unit 25 for controlling the drive of the liquid crystal panel 11 and an LED control for controlling the drive of the LED 17 provided in the backlight device 12. And at least a unit (light source control unit) 26. The panel control unit 25 includes a video signal processing circuit unit 27 that processes a video signal, and a pixel drive unit 28 that drives each pixel based on an output signal from the video signal processing circuit unit 27. Provided in The control substrate is provided with a CPU 29 that controls operations of the video signal processing circuit unit 27, the pixel drive unit 28, and the LED drive unit 30 described later. The LED control unit 26 has an LED drive unit 30 that drives the LED 17 based on an output signal from the video signal processing circuit unit 27 and is provided on the LED drive circuit board. The operation of the LED drive unit 30 is controlled by the CPU 29 of the control substrate, and is synchronized with the operation of the pixel drive unit 28.

ＬＥＤ制御部２６は、図３及び図４に示すように、Ｘ軸方向に沿って一列に並ぶ複数のＬＥＤ１７のうち、連続して並ぶ複数ずつのＬＥＤ１７からなる複数のＬＥＤ群（光源群）３１の駆動を個別に制御している。本実施形態では、１つのＬＥＤ群３１がＸ軸方向に沿って連続して並んで互いに直列に接続される１６個のＬＥＤ１７からなり、ＬＥＤ群３１の総数が１６個とされる。ＬＥＤ制御部２６は、例えば画素駆動部２８によって各画素が駆動されるのに伴って表示面１１ＤＳに表示される画像の表示範囲に基づいて合計１６個のＬＥＤ群３１の点灯の是非及び輝度値を個別に制御することができる。各ＬＥＤ群３１の具体的な駆動に関しては、ＬＥＤ制御部２６は、各ＬＥＤ群３１にパルス信号を供給するとともに、各ＬＥＤ群３１における点灯期間と消灯期間（非点灯期間）との時間比率（デューティ比）を調整することで単位時間当たりの発光量を制御するものとされる。つまり、ＬＥＤ制御部２６は、各ＬＥＤ群３１を周期的に点滅させ、その点灯期間と消灯期間との時間比率を変化させるＰＷＭ（Pulse Width Modulation）調光駆動を行うものとされる。以下では、１６個のＬＥＤ群３１を区別する場合は、図４に示す右端（図３に示す左端）から順に第１ＬＥＤ群３１Ａ、第２ＬＥＤ群３１Ｂ、第３ＬＥＤ群３１Ｃ、第４ＬＥＤ群３１Ｄ、第５ＬＥＤ群３１Ｅ、第６ＬＥＤ群３１Ｆ、第７ＬＥＤ群３１Ｇ、第８ＬＥＤ群３１Ｈ、第９ＬＥＤ群３１Ｉ、第１０ＬＥＤ群３１Ｊ、第１１ＬＥＤ群３１Ｋ、第１２ＬＥＤ群３１Ｌ、第１３ＬＥＤ群３１Ｍ、第１４ＬＥＤ群３１Ｎ、第１５ＬＥＤ群３１Ｏ、第１６ＬＥＤ群３１Ｐとする。図４に示す右側（図３に示す左側）のＬＥＤ基板１８には、第１ＬＥＤ群３１Ａから第８ＬＥＤ群３１Ｈが配されるのに対し、図４に示す左側（図３に示す右側）のＬＥＤ基板１８には、第９ＬＥＤ群３１Ｉから第１６ＬＥＤ群３１Ｐが配されている。   The LED control unit 26 is, as shown in FIGS. 3 and 4, a plurality of LED groups (light source group) 31 including a plurality of LEDs 17 arranged in series among the plurality of LEDs 17 arranged in a line along the X axis direction. The drive of each is individually controlled. In the present embodiment, one LED group 31 is composed of sixteen LEDs 17 arranged in series along the X-axis direction and connected to one another in series, and the total number of LED groups 31 is sixteen. For example, the LED control unit 26 determines whether or not the lighting of the total of 16 LED groups 31 is lighted based on the display range of the image displayed on the display surface 11DS as each pixel is driven by the pixel drive unit 28. Can be controlled individually. Regarding specific driving of each LED group 31, the LED control unit 26 supplies a pulse signal to each LED group 31, and the time ratio between the lighting period and the light-off period (non-lighting period) in each LED group 31 ( The light emission amount per unit time is controlled by adjusting the duty ratio. That is, the LED control unit 26 performs PWM (Pulse Width Modulation) light modulation driving in which each LED group 31 is blinked periodically and the time ratio between the lighting period and the light-off period is changed. In the following, when the sixteen LED groups 31 are distinguished, the first LED group 31A, the second LED group 31B, the third LED group 31C, the fourth LED group 31D, and the fourth LED group 31B are sequentially arranged from the right end shown in FIG. 5 LED group 31 E, sixth LED group 31 F, seventh LED group 31 G, eighth LED group 31 H, ninth LED group 31 I, tenth LED group 31 J, eleventh LED group 31 K, twelfth LED group 31 L, thirteenth LED group 31 M, fourteenth LED group 31 N, The fifteenth LED group 31O and the sixteenth LED group 31P are used. While the first LED group 31A to the eighth LED group 31H are arranged on the LED substrate 18 on the right side (left side shown in FIG. 3) shown in FIG. 4, the LEDs on the left side (right side shown in FIG. 3) The substrate 18 is provided with a ninth LED group 31I to a sixteenth LED group 31P.

ＬＥＤ制御部２６のＬＥＤ駆動部３０には、図６に示すように、各ＬＥＤ群３１に対して個別に接続されるＬＥＤ駆動回路３２がＬＥＤ群３１と同数備えられている。以下では、１６個のＬＥＤ駆動回路３２を区別する場合は、第１ＬＥＤ群３１Ａに接続されたものを第１ＬＥＤ駆動回路３２Ａとし、第２ＬＥＤ群３１Ｂに接続されたものを第２ＬＥＤ駆動回路３２Ｂとし、第３ＬＥＤ群３１Ｃに接続されたものを第３ＬＥＤ駆動回路３２Ｃとし、第４ＬＥＤ群３１Ｄに接続されたものを第４ＬＥＤ駆動回路３２Ｄとし、第５ＬＥＤ群３１Ｅに接続されたものを第５ＬＥＤ駆動回路３２Ｅとし、第６ＬＥＤ群３１Ｆに接続されたものを第６ＬＥＤ駆動回路３２Ｆとし、第７ＬＥＤ群３１Ｇに接続されたものを第７ＬＥＤ駆動回路３２Ｇとし、第８ＬＥＤ群３１Ｈに接続されたものを第８ＬＥＤ駆動回路３２Ｈとし、第９ＬＥＤ群３１Ｉに接続されたものを第９ＬＥＤ駆動回路３２Ｉとし、第１０ＬＥＤ群３１Ｊに接続されたものを第１０ＬＥＤ駆動回路３２Ｊとし、第１１ＬＥＤ群３１Ｋに接続されたものを第１１ＬＥＤ駆動回路３２Ｋとし、第１２ＬＥＤ群３１Ｌに接続されたものを第１２ＬＥＤ駆動回路３２Ｌとし、第１３ＬＥＤ群３１Ｍに接続されたものを第１３ＬＥＤ駆動回路３２Ｍ、第１４ＬＥＤ群３１Ｎに接続されたものを第１４ＬＥＤ駆動回路３２Ｎとし、第１５ＬＥＤ群３１Ｏに接続されたものを第１５ＬＥＤ駆動回路３２Ｏとし、第１６ＬＥＤ群３１Ｐに接続されたものを第１６ＬＥＤ駆動回路３２Ｐとする。   The LED drive unit 30 of the LED control unit 26 is provided with the same number of LED drive circuits 32 individually connected to each LED group 31 as shown in FIG. Hereinafter, in the case where the sixteen LED drive circuits 32 are distinguished, the one connected to the first LED group 31A is referred to as a first LED drive circuit 32A, and the one connected to the second LED group 31B is referred to as a second LED drive circuit 32B. The third LED drive circuit 32C is connected to the third LED group 31C, the fourth LED drive circuit 32D is connected to the fourth LED group 31D, and the fifth LED drive circuit 32E is connected to the fifth LED group 31E. The sixth LED drive circuit 32F is connected to the sixth LED group 31F, the seventh LED drive circuit 32G is connected to the seventh LED group 31G, and the eighth LED drive circuit 32H is connected to the eighth LED group 31H. , And the ninth LED drive circuit 32I is connected to the ninth LED group 31I, and the tenth LED group 31 Is connected to the tenth LED drive circuit 32J, one connected to the eleventh LED group 31K is referred to as an eleventh LED drive circuit 32K, and one connected to the twelfth LED group 31L is referred to as a twelfth LED drive circuit 32L. The one connected to 31M is the thirteenth LED drive circuit 32M, the one connected to the fourteenth LED group 31N is the fourteenth LED drive circuit 32N, the one connected to the fifteenth LED group 31O is the fifteenth LED drive circuit 32O, and the sixteenth LED group The one connected to 31P is referred to as a sixteenth LED drive circuit 32P.

ところで、上記したように放熱部材２１を構成する放熱部２１ｂには、図２及び図４に示すように、ＬＥＤ基板１８の給電用突出部１８ｂ及び基板側コネクタ２３を通すための開口部２１ｂ１が形成されている。このため、開口部２１ｂ１自身とともに放熱部材２１における開口部２１ｂ１付近において放熱性能が局所的に低下しており、ここが低放熱部３３となっている。このような低放熱部３３の近傍に配されるＬＥＤ１７は、放熱が十分になされないために温度上昇が生じ易くなっており、場合によってはＬＥＤ１７に性能の劣化が生じたり、ＬＥＤ１７に故障が生じるおそれがある。   By the way, as described above, as shown in FIGS. 2 and 4, the heat radiating portion 21 b constituting the heat radiating member 21 has the opening 21 b 1 for passing the power supply projecting portion 18 b of the LED substrate 18 and the substrate side connector 23. It is formed. For this reason, the heat radiation performance is locally reduced near the opening 21 b 1 of the heat radiation member 21 together with the opening 21 b 1 itself, and this is the low heat radiation part 33. The LED 17 disposed in the vicinity of such a low heat radiation portion 33 is likely to cause a temperature rise because heat is not sufficiently dissipated, and in some cases, the performance of the LED 17 may deteriorate or the LED 17 may fail. There is a fear.

その点、本実施形態に係るバックライト装置１２に備わるＬＥＤ制御部２６は、図５及び図７に示すように、複数のＬＥＤ群３１に最大輝度が制限された輝度制限ＬＥＤ群（輝度制限光源群）３４が選択的に含まれるよう、複数のＬＥＤ群３１の駆動を制御している。図７は、ＬＥＤ制御部２６によって制御される各ＬＥＤ群３１の最大輝度の相対値である。図７における「最大輝度値」は、規格上許容され得るＬＥＤ１７の最大輝度を基準（１００％）としており、図７において最大輝度の数値が１００％の場合はＬＥＤ制御部２６が実質的に対象となるＬＥＤ群３１の最大輝度を制限していないことを意味しており、図７において最大輝度の数値が１００％より小さい場合はＬＥＤ制御部２６が実質的に対象となるＬＥＤ群３１の最大輝度を制限していることを意味する。このように、ＬＥＤ制御部２６によって輝度制限ＬＥＤ群３４の最大輝度を制限しているので、輝度制限ＬＥＤ群３４付近に生じる温度上昇を抑制することができる。これにより、温度上昇に伴うＬＥＤ１７の劣化や故障の発生が生じ難くなる。その上で、従来のように発光素子の数が互いに異なる複数種類の発光素子ブロックを備える場合に比べると、ＬＥＤ１７に係る構成を特殊なものとする必要がなく、製造コストを低く抑える上で好適となる。   In that respect, as shown in FIG. 5 and FIG. 7, the LED control unit 26 included in the backlight device 12 according to the present embodiment is a luminance limited LED group whose maximum luminance is limited to a plurality of LED groups 31 (a luminance limited light source Driving of the plurality of LED groups 31 is controlled such that the group 34 is selectively included. FIG. 7 is a relative value of the maximum luminance of each LED group 31 controlled by the LED control unit 26. The “maximum brightness value” in FIG. 7 is based on the maximum brightness of the LED 17 that is permissible in the standard (100%), and in FIG. 7, when the numerical value of the maximum brightness is 100%, the LED control unit 26 substantially targets This means that the maximum brightness of the LED group 31 is not limited, and in the case where the numerical value of the maximum brightness is smaller than 100% in FIG. It means that the brightness is limited. As described above, since the maximum brightness of the brightness limited LED group 34 is limited by the LED control unit 26, it is possible to suppress a temperature rise that occurs near the brightness limited LED group 34. As a result, the occurrence of the deterioration or failure of the LED 17 due to the temperature rise is less likely to occur. In addition, it is not necessary to make the configuration relating to the LED 17 special as compared with the case where a plurality of types of light emitting element blocks having different numbers of light emitting elements from each other as in the prior art is provided. It becomes.

輝度制限ＬＥＤ群３４について詳しく説明する。まず、図３及び図４に示すように、ＬＥＤ群３１のうち、Ｘ軸方向について中央側に配される第６ＬＥＤ群３１Ｆから第１０ＬＥＤ群３１Ｊを中央側ＬＥＤ群３５とし、Ｘ軸方向について両端側に配される第１ＬＥＤ群３１Ａから第４ＬＥＤ群３１Ｄと第１２ＬＥＤ群３１Ｌから第１６ＬＥＤ群３１Ｐとを端側ＬＥＤ群３６とし、Ｘ軸方向について中央側ＬＥＤ群３５と端側ＬＥＤ群３６との間に配される第６ＬＥＤ群３１Ｆと第１１ＬＥＤ群３１Ｋとを中間ＬＥＤ群３７とする。ＬＥＤ制御部２６は、図７に示すように、上記のうち端側ＬＥＤ群３６及び中間ＬＥＤ群３７に輝度制限ＬＥＤ群３４が含まれるよう駆動を制御している。具体的には、ＬＥＤ制御部２６は、中央側ＬＥＤ群３５の最大輝度の数値が実質的に無制限である「１００％」となり、端側ＬＥＤ群３６の最大輝度の数値が、中央側ＬＥＤ群３５の最大輝度の数値よりも低い「８０％」となるよう制御している。このようにすれば、導光板１９のうち、Ｘ軸方向についての中央側に配される中央側ＬＥＤ群３５によって供給される光量を最大限に確保することができる。一方、導光板１９のうち、Ｘ軸方向についての端側に配される端側ＬＥＤ群３６によって供給される光量が中央側に比べて制限されることで、液晶表示装置１０の表示品位が優れたものとなる。一方、ＬＥＤ制御部２６は、中間ＬＥＤ群３７の最大輝度の数値が、中央側ＬＥＤ群３５の最大輝度の数値よりも低いものの、端側ＬＥＤ群３６に係る最大輝度の数値よりは高い「９０％」となるよう制御している。このようにすれば、導光板１９においてＸ軸方向について中央側から端側に向かって各ＬＥＤ群３１から供給される光量が次第に少なくなる。これにより、液晶表示装置１０の表示品位がより優れたものとなる。   The brightness limited LED group 34 will be described in detail. First, as shown in FIG. 3 and FIG. 4, the sixth LED group 31 F to the tenth LED group 31 J disposed at the center side in the X axis direction among the LED groups 31 are the center side LED group 35 and both ends in the X axis direction The first LED group 31A to the fourth LED group 31D and the twelfth LED group 31L to the sixteenth LED group 31P disposed on the side are the end side LED group 36, and the center side LED group 35 and the end side LED group 36 in the X axis direction The sixth LED group 31F and the eleventh LED group 31K disposed therebetween are referred to as an intermediate LED group 37. As shown in FIG. 7, the LED control unit 26 controls the drive so that the end-side LED group 36 and the middle LED group 37 include the luminance limited LED group 34 as described above. Specifically, in the LED control unit 26, the numerical value of the maximum luminance of the central side LED group 35 is "100%", which is substantially unlimited, and the numerical value of the maximum luminance of the end side LED group 36 is the central side LED group It is controlled to be "80%" lower than the maximum luminance value of 35. In this way, it is possible to maximize the amount of light supplied by the central LED group 35 disposed on the central side in the X-axis direction in the light guide plate 19. On the other hand, the display quality of the liquid crystal display device 10 is excellent by limiting the amount of light supplied by the end side LED group 36 disposed on the end side in the X axis direction of the light guide plate 19 compared to the center side. It will be On the other hand, in the LED control unit 26, although the numerical value of the maximum luminance of the middle LED group 37 is lower than the numerical value of the maximum luminance of the center side LED group 35, “90 It controls to become "%". In this way, in the light guide plate 19, the amount of light supplied from each LED group 31 gradually decreases from the center to the end in the X-axis direction. Thereby, the display quality of the liquid crystal display device 10 becomes more excellent.

そして、ＬＥＤ制御部２６によって輝度制限ＬＥＤ群３４として制御される中間ＬＥＤ群３７である第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋは、図４に示すように、全ＬＥＤ群３１の中で放熱部材２１の低放熱部３３である開口部２１ｂ１に最も近い配置とされている。このようにすれば、放熱部材２１の低放熱部３３である開口部２１ｂ１に起因してＬＥＤ基板１８が局所的に温度上昇し易くなるものの、低放熱部３３である開口部２１ｂ１に最も近い第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋを輝度制限ＬＥＤ群３４となるようＬＥＤ制御部２６によって駆動を制御することで、第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋ付近に生じる温度上昇を好適に抑制することができる。   The sixth LED group 31F and the eleventh LED group 31K, which are the intermediate LED group 37 controlled as the brightness limited LED group 34 by the LED control unit 26, are the heat dissipation members 21 among all the LED groups 31, as shown in FIG. It is arranged closest to the opening 21 b 1 which is the low heat dissipation part 33 of the above. In this way, although the temperature of the LED substrate 18 tends to rise locally due to the opening 21b1 which is the low heat radiation part 33 of the heat radiation member 21, the closest to the opening 21b1 which is the low heat radiation part 33 By controlling the drive by the LED control unit 26 so that the 6th LED group 31F and the 11th LED group 31K become the luminance limited LED group 34, it is possible to preferably suppress the temperature rise generated in the vicinity of the 6th LED group 31F and the 11th LED group 31K it can.

その上で、ＬＥＤ基板１８においてＸ軸方向について対称位置に配される２つの基板側コネクタ２３は、図４に示すように、ＬＥＤ基板１８におけるＸ軸方向についての中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに対して中央位置ＣＰ側に偏在している。従って、２つの基板側コネクタ２３と平面に視て重畳する２つの開口部２１ｂ１（低放熱部３３）及びその最も近い配置となる第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋについても、上記したＬＥＤ基板１８の中間位置ＩＰに対して中央位置ＣＰ側に偏在することになる。このようにすれば、仮に中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに２つの基板側コネクタが配された場合に比べると、輝度制限ＬＥＤ群３４である第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋが上記中間位置ＩＰに対して中央位置ＣＰ側に偏在する分だけ、輝度制限ＬＥＤ群３４である第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋから発せられた光が導光板１９におけるＸ軸方向についての中央側には供給され難くなる。つまり、最大輝度が制限されないＬＥＤ群３１である中央側ＬＥＤ群３５から発せられた光が導光板１９における並び方向についての中央側に供給され易くなるので、導光板１９における並び方向についての中央側に供給される光量を十分に確保することができる。   Furthermore, as shown in FIG. 4, the two substrate side connectors 23 disposed at symmetrical positions in the X-axis direction in the LED substrate 18 have a central position CP and an end position EP in the X-axis direction in the LED substrate 18. With respect to the intermediate position IP between them and the central position CP. Therefore, the above-mentioned LED board 18 is applied to the two openings 21b1 (low heat dissipation part 33) overlapping the two substrate side connectors 23 in a plan view and the sixth LED group 31F and the eleventh LED group 31K which are arranged closest to the two openings 21b1. It is unevenly distributed to the central position CP side with respect to the intermediate position IP of. In this manner, the sixth LED group 31F and the eleventh LED, which are the luminance limited LED group 34, are temporarily compared with the case where two board side connectors are disposed at the intermediate position IP between the central position CP and the end position EP. The light emitted from the sixth LED group 31F and the eleventh LED group 31K, which are the luminance-limited LED group 34, with respect to the X axis direction in the light guide plate 19 by the amount that the group 31K is unevenly distributed on the central position CP side It becomes difficult to be supplied to the central side of the That is, the light emitted from the central LED group 35 which is the LED group 31 whose maximum luminance is not limited is easily supplied to the central side in the arrangement direction of the light guide plate 19, so the central side in the arrangement direction of the light guide plate 19 It is possible to secure a sufficient amount of light supplied to the

次に、液晶パネル１１に表示される画像に応じてＬＥＤ制御部２６によって各ＬＥＤ群３１の駆動をどのように制御するかについて詳しく説明する。以下では、液晶パネル１１の表示面１１ＤＳに白画像（最大階調画像）を表示する場合について説明する。先に、図８に示すように、液晶パネル１１の表示面１１ＤＳに表示される白画像の面積比率が１０％となり且つその配置が表示面１１ＤＳにおけるＸ軸方向について中央位置となる場合（具体的には画像の中央位置が第８ＬＥＤ群３１Ｉと第９ＬＥＤ群３１Ｈとの間となる場合）について説明する。なお、画像の面積比率は、表示面１１ＤＳにおける最大表示面積を基準（１００％）とした相対値である。また、図８では、各ＬＥＤ群３１Ａ〜３１Ｐの配置範囲を矢線にて図示する一方、白画像の表示範囲を白抜きにして図示し、白画像が表示されない非表示範囲を網掛け状にして図示している。この場合、ＬＥＤ制御部２６は、図９に示すように、中央側ＬＥＤ群３５及び中間ＬＥＤ群３７についてはそれぞれの最大輝度値でもって点灯させ、端側ＬＥＤ群３６については最大輝度値よりも低い輝度値でもって点灯させるか非点灯とされる。中間ＬＥＤ群３７は、最大輝度値でもって点灯されるものの、その最大輝度値は９０％に制限されているので、最大輝度値が実質的に制限されていない中央側ＬＥＤ群３５の輝度値である１００％に比べると、相対的に低い数値となっている。これにより、中間ＬＥＤ群３７である第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋの近くにおいて低放熱部３３に起因して放熱性能が低下していても、第６ＬＥＤ群３１Ｆ及び第１１ＬＥＤ群３１Ｋに劣化や故障などが生じ難いものとなっている。なお、端側ＬＥＤ群３６のうち、中間ＬＥＤ群３７に対して端側に隣り合う第５ＬＥＤ群３１Ｅ及び第１２ＬＥＤ群３１Ｌは、２０％の輝度値で、さらにその端側に隣り合う第４ＬＥＤ群３１Ｄ及び第１３ＬＥＤ群３１Ｍについては、５％の輝度値で、それぞれ点灯され、それ以外のＬＥＤ群３１Ａ〜３１Ｃ，３１Ｎ〜３１Ｐについては非点灯とされる。   Next, how to control the drive of each LED group 31 by the LED control unit 26 in accordance with the image displayed on the liquid crystal panel 11 will be described in detail. Below, the case where a white image (maximum gradation image) is displayed on the display surface 11DS of the liquid crystal panel 11 will be described. First, as shown in FIG. 8, when the area ratio of the white image displayed on the display surface 11DS of the liquid crystal panel 11 is 10% and the arrangement is at the center position in the X axis direction in the display surface 11DS (specifically The case where the central position of the image is between the eighth LED group 31I and the ninth LED group 31H will be described. The area ratio of the image is a relative value based on the maximum display area on the display surface 11DS (100%). Further, in FIG. 8, the arrangement range of each of the LED groups 31A to 31P is illustrated by an arrow, while the display range of the white image is outlined and the non-display range where the white image is not displayed is shaded. Is shown. In this case, as shown in FIG. 9, the LED control unit 26 lights the central side LED group 35 and the middle LED group 37 with the maximum luminance value, and the end side LED group 36 has the maximum luminance value It is turned on or off with a low luminance value. Although the middle LED group 37 is turned on with the maximum brightness value, the maximum brightness value is limited to 90%, so the brightness value of the central side LED group 35 whose maximum brightness value is not substantially limited It is relatively low compared to 100%. As a result, even if the heat dissipation performance is lowered due to the low heat dissipation portion 33 near the sixth LED group 31F and the eleventh LED group 31K, which are the middle LED group 37, deterioration to the sixth LED group 31F and the eleventh LED group 31K It is difficult for troubles to occur. In the end-side LED group 36, the fifth LED group 31E and the twelfth LED group 31L adjacent to the end side with respect to the intermediate LED group 37 have a luminance value of 20%, and the fourth LED group adjacent to the end side The 31D and the 13th LED group 31M are turned on at a luminance value of 5%, and the other LED groups 31A to 31C and 31N to 31P are turned off.

次に、図１０に示すように、液晶パネル１１の表示面１１ＤＳに表示される白画像の面積比率が１０％となり且つその配置が表示面１１ＤＳにおけるＸ軸方向について中央位置よりも同図の右寄りとなる場合（具体的には画像の中央位置が第１０ＬＥＤ群３１Ｊと第１１ＬＥＤ群３１Ｋとの間となる場合）について説明する。なお、図１０では、各ＬＥＤ群３１Ａ〜３１Ｐの配置範囲を矢線にて図示する一方、白画像の表示範囲を白抜きにして図示し、白画像が表示されない非表示範囲を網掛け状にして図示している。この場合、ＬＥＤ制御部２６は、図１１に示すように、中央側ＬＥＤ群３５である第８ＬＥＤ群３１Ｈ〜第１０ＬＥＤ群３１Ｊと、中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋと、端側ＬＥＤ群３６である第１２ＬＥＤ群３１Ｌ及び第１３ＬＥＤ群３１Ｍと、についてはそれぞれの最大輝度値でもって点灯させ、上記以外のＬＥＤ群３１については最大輝度値よりも低い輝度値でもって点灯させるか非点灯とされる。中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋは、最大輝度値でもって点灯されるものの、その最大輝度値は９０％に制限されているので、最大輝度値が実質的に制限されていない中央側ＬＥＤ群３５の輝度値である１００％に比べると、相対的に低い数値となっている。これにより、中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋの近くにおいて低放熱部３３に起因して放熱性能が低下していても、第１１ＬＥＤ群３１Ｋに劣化や故障などが生じ難いものとなっている。なお、上記した最大輝度値で点灯されるＬＥＤ群３１に対して端側に隣り合う第７ＬＥＤ群３１Ｇ及び第１４ＬＥＤ群３１Ｎは、２０％の輝度値で、さらにその端側に隣り合う第６ＬＥＤ群３１Ｆ及び第１５ＬＥＤ群３１Ｏについては、５％の輝度値で、それぞれ点灯され、それ以外のＬＥＤ群３１Ａ〜３１Ｅ，３１Ｐについては非点灯とされる。   Next, as shown in FIG. 10, the area ratio of the white image displayed on the display surface 11DS of the liquid crystal panel 11 is 10%, and the arrangement is closer to the right in the drawing than the center position in the X axis direction in the display surface 11DS. The case (specifically, the case where the central position of the image is between the tenth LED group 31J and the eleventh LED group 31K) will be described. In FIG. 10, the arrangement range of each of the LED groups 31A to 31P is illustrated by an arrow, while the display range of the white image is outlined and the non-display range in which the white image is not displayed is shaded. Is shown. In this case, as shown in FIG. 11, the LED control unit 26 includes eighth LED group 31 H to tenth LED group 31 J as the center side LED group 35, eleventh LED group 31 K as the middle LED group 37, and end LED groups. The twelfth LED group 31L and the thirteenth LED group 31M, which are 36, are turned on with their respective maximum luminance values, and the other LED groups 31 are turned on with a luminance value lower than the maximum luminance value or not turned on. Be done. Although the eleventh LED group 31K, which is the middle LED group 37, is turned on with the maximum luminance value, the maximum luminance value is limited to 90%, so the center side LED whose maximum luminance value is not substantially restricted Compared to 100% which is the luminance value of the group 35, the value is relatively low. As a result, even if the heat dissipation performance is lowered due to the low heat dissipation portion 33 near the eleventh LED group 31K, which is the middle LED group 37, the eleventh LED group 31K is less likely to deteriorate or fail. . The seventh LED group 31G and the fourteenth LED group 31N adjacent to the end side with respect to the LED group 31 lit at the above-mentioned maximum luminance value have the luminance value of 20%, and the sixth LED group adjacent to the end side The 31F and the fifteenth LED group 31O are turned on at a luminance value of 5%, and the other LED groups 31A to 31E and 31P are turned off.

次に、図１２に示すように、液晶パネル１１の表示面１１ＤＳに表示される画像の面積比率が１０％となり且つその配置が表示面１１ＤＳにおけるＸ軸方向について同図の右端寄りとなる場合（具体的には画像の中央位置が第１２ＬＥＤ群３１Ｌと第１３ＬＥＤ群３１Ｍとの間となる場合）について説明する。なお、図１２では、各ＬＥＤ群３１Ａ〜３１Ｐの配置範囲を矢線にて図示する一方、白画像の表示範囲を白抜きにして図示し、白画像が表示されない非表示範囲を網掛け状にして図示している。この場合、ＬＥＤ制御部２６は、図１３に示すように、中央側ＬＥＤ群３５である第１０ＬＥＤ群３１Ｊと、中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋと、端側ＬＥＤ群３６である第１２ＬＥＤ群３１Ｌ〜第１５ＬＥＤ群３１Ｏと、についてはそれぞれの最大輝度値でもって点灯させ、上記以外のＬＥＤ群３１については最大輝度値よりも低い輝度値でもって点灯させるか非点灯とされる。中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋは、最大輝度値でもって点灯されるものの、その最大輝度値は９０％に制限されているので、最大輝度値が実質的に制限されていない中央側ＬＥＤ群３５の輝度値である１００％に比べると、相対的に低い数値となっている。これにより、中間ＬＥＤ群３７である第１１ＬＥＤ群３１Ｋの近くにおいて低放熱部３３に起因して放熱性能が低下していても、第１１ＬＥＤ群３１Ｋに劣化や故障などが生じ難いものとなっている。なお、上記した最大輝度値で点灯されるＬＥＤ群３１に対して端側に隣り合う第９ＬＥＤ群３１Ｉ及び第１６ＬＥＤ群３１Ｐは、２０％の輝度値で、さらにその端側に隣り合う第８ＬＥＤ群３１Ｈについては、５％の輝度値で、それぞれ点灯され、それ以外のＬＥＤ群３１Ａ〜３１Ｇについては非点灯とされる。   Next, as shown in FIG. 12, when the area ratio of the image displayed on the display surface 11DS of the liquid crystal panel 11 is 10% and the arrangement is closer to the right end of the drawing in the X axis direction in the display surface 11DS ( Specifically, the case where the central position of the image is between the twelfth LED group 31L and the thirteenth LED group 31M will be described. In FIG. 12, the arrangement range of each of the LED groups 31A to 31P is illustrated by an arrow, while the display range of the white image is outlined and the non-display range in which the white image is not displayed is shaded. Is shown. In this case, as shown in FIG. 13, the LED control unit 26 includes a tenth LED group 31J that is the center side LED group 35, an eleventh LED group 31K that is the middle LED group 37, and a twelfth LED that is the end side LED group 36. The group 31L to the fifteenth LED group 31O are turned on with their respective maximum luminance values, and the other LED groups 31 are turned on or off with a luminance value lower than the maximum luminance value. Although the eleventh LED group 31K, which is the middle LED group 37, is turned on with the maximum luminance value, the maximum luminance value is limited to 90%, so the center side LED whose maximum luminance value is not substantially restricted Compared to 100% which is the luminance value of the group 35, the value is relatively low. As a result, even if the heat dissipation performance is lowered due to the low heat dissipation portion 33 near the eleventh LED group 31K, which is the middle LED group 37, the eleventh LED group 31K is less likely to deteriorate or fail. . The ninth LED group 31I and the sixteenth LED group 31P adjacent to the end side with respect to the LED group 31 lit at the above-described maximum luminance value have the 20% luminance value, and the eighth LED group adjacent to the end side The 31H is turned on at a luminance value of 5%, and the other LED groups 31A to 31G are turned off.

以上説明したように本実施形態のバックライト装置（照明装置）１２は、外周端面の少なくとも一部に光が入射される入光端面１９ａを有する導光板１９と、入光端面１９ａに沿って一列に並ぶ複数のＬＥＤ（光源）１７と、複数のＬＥＤ１７のうち、連続して並ぶ複数ずつのＬＥＤ１７からなる複数のＬＥＤ群（光源群）３１と、複数のＬＥＤ群３１に最大輝度が制限された輝度制限ＬＥＤ群（輝度制限光源群）３４が選択的に含まれるよう、複数のＬＥＤ群３１の駆動を制御するＬＥＤ制御部（光源制御部）２６と、を備える。   As described above, the backlight device (illumination device) 12 of the present embodiment includes the light guide plate 19 having the light incident end face 19a on which light is incident on at least a part of the outer peripheral end face, and one row along the light incident end face 19a. The maximum brightness is limited to a plurality of LED groups (light source group) 31 and a plurality of LED groups 31 each including a plurality of LEDs (light sources) 17 arranged in series and a plurality of LEDs 17 arranged in series among the plurality of LEDs 17 And an LED control unit (light source control unit) 26 that controls driving of the plurality of LED groups 31 such that the brightness limited LED group (brightness limited light source group) 34 is selectively included.

このようにすれば、ＬＥＤ制御部２６によって複数のＬＥＤ群３１の駆動を制御することで、複数のＬＥＤ群３１に含まれる複数ずつのＬＥＤ１７がそれぞれ発光される。複数のＬＥＤ１７から発せられた光は、導光板１９の入光端面１９ａに入射された後に導光板１９から出射される。ＬＥＤ制御部２６は、複数のＬＥＤ群３１に含まれる特定のＬＥＤ群３１である輝度制限ＬＥＤ群３４について最大輝度を制限しているから、その輝度制限ＬＥＤ群３４付近に生じる温度上昇を抑制することができる。これにより、温度上昇に伴うＬＥＤ１７の劣化や故障の発生が生じ難くなる。その上で、従来のように発光素子の数が互いに異なる複数種類の発光素子ブロックを備える場合に比べると、ＬＥＤ１７に係る構成を特殊なものとする必要がなく、製造コストを低く抑える上で好適となる。   In this way, by controlling the driving of the plurality of LED groups 31 by the LED control unit 26, each of the plurality of LEDs 17 included in the plurality of LED groups 31 emits light. Light emitted from the plurality of LEDs 17 is emitted from the light guide plate 19 after being incident on the light incident end face 19 a of the light guide plate 19. Since the LED control unit 26 limits the maximum brightness of the brightness limited LED group 34 which is the specific LED group 31 included in the plurality of LED groups 31, it suppresses the temperature rise occurring near the brightness limited LED group 34. be able to. As a result, the occurrence of the deterioration or failure of the LED 17 due to the temperature rise is less likely to occur. In addition, it is not necessary to make the configuration relating to the LED 17 special as compared with the case where a plurality of types of light emitting element blocks having different numbers of light emitting elements from each other as in the prior art is provided. It becomes.

また、複数のＬＥＤ群３１には、複数のＬＥＤ１７の並び方向について相対的に中央側に配される中央側ＬＥＤ群３５と、並び方向について相対的に端側に配される端側ＬＥＤ群３６と、が少なくとも含まれており、ＬＥＤ制御部２６は、端側ＬＥＤ群３６に輝度制限ＬＥＤ群３４が含まれてその最大輝度が中央側ＬＥＤ群３５に係る最大輝度よりも低くなるよう制御する。このようにすれば、導光板１９のうち、複数のＬＥＤ１７の並び方向についての中央側に配される中央側ＬＥＤ群３５によって供給される光量を十分に確保することができる。一方、導光板１９のうち、複数のＬＥＤ１７の並び方向についての端側に配される端側ＬＥＤ群３６によって供給される光量が中央側に比べて制限されることで、例えば導光板１９の出射光を液晶表示装置１０の照明光として用いた場合には表示品位に優れる。   In addition, the plurality of LED groups 31 includes a central side LED group 35 disposed relatively on the center side in the arrangement direction of the plurality of LEDs 17 and an end side LED group 36 disposed relatively on the end side in the arrangement direction. And the LED control unit 26 controls the end side LED group 36 to include the luminance limited LED group 34 so that the maximum luminance is lower than the maximum luminance of the center side LED group 35. . In this way, it is possible to ensure a sufficient amount of light supplied by the central LED group 35 disposed on the central side of the light guide plate 19 in the direction in which the plurality of LEDs 17 are arranged. On the other hand, the amount of light supplied by the end-side LED group 36 disposed on the end side of the light guide plate 19 in the arranging direction of the plurality of LEDs 17 is limited compared to the center side, for example When the incident light is used as illumination light of the liquid crystal display device 10, the display quality is excellent.

また、複数のＬＥＤ群３１には、並び方向について中央側ＬＥＤ群３５と端側ＬＥＤ群３６との間に配される中間ＬＥＤ群３７が含まれており、ＬＥＤ制御部２６は、中間ＬＥＤ群３７に輝度制限ＬＥＤ群３４が含まれてその最大輝度が中央側ＬＥＤ群３５に係る最大輝度よりも低いものの、端側ＬＥＤ群３６に係る最大輝度よりは高くなるよう制御する。このようにすれば、導光板１９において並び方向について中央側から端側に向かって各ＬＥＤ群３１から供給される光量が次第に少なくなる。これにより、例えば導光板１９の出射光を液晶表示装置１０の照明光として用いた場合には表示品位に優れる。   In addition, the plurality of LED groups 31 includes an intermediate LED group 37 disposed between the central side LED group 35 and the end side LED group 36 in the arrangement direction, and the LED control unit 26 Although the luminance limited LED group 34 is included in 37 and the maximum luminance thereof is lower than the maximum luminance related to the center side LED group 35, control is performed so as to be higher than the maximum luminance related to the end side LED group 36. In this way, in the light guide plate 19, the amount of light supplied from each of the LED groups 31 gradually decreases from the center to the end in the arranging direction. Thereby, for example, when the light emitted from the light guide plate 19 is used as the illumination light of the liquid crystal display device 10, the display quality is excellent.

また、ＬＥＤ制御部２６は、中央側ＬＥＤ群３５については最大輝度が１００％となるよう駆動を制御する。このようにすれば、中央側ＬＥＤ群３５に係る最大輝度が制限されずに１００％での発光を可能としているから、導光板１９における並び方向についての中央側に中央側ＬＥＤ群３５によって供給される光量を最大限に確保することができる。   Further, the LED control unit 26 controls the drive so that the maximum luminance of the center side LED group 35 is 100%. In this way, the maximum luminance related to the center side LED group 35 is allowed to emit light at 100% without being limited, so the center side LED group 35 supplies the light to the center side in the arrangement direction of the light guide plate 19. Maximum light intensity can be secured.

また、複数のＬＥＤ１７が実装されるＬＥＤ基板（光源基板）１８と、ＬＥＤ基板１８に接する形で配されて部分的に放熱性が低い低放熱部３３を有する放熱部材２１と、を備えており、ＬＥＤ制御部２６は、複数のＬＥＤ群３１のうち、低放熱部３３に最も近いものが輝度制限ＬＥＤ群３４となるよう駆動を制御する。このようにすれば、放熱部材２１の低放熱部３３に起因してＬＥＤ基板１８が局所的に温度上昇し易くなるものの、低放熱部３３に最も近いＬＥＤ群３１を輝度制限ＬＥＤ群３４となるようＬＥＤ制御部２６によって駆動を制御することで、輝度制限ＬＥＤ群３４付近に生じる温度上昇を好適に抑制することができる。   The light emitting device further includes an LED substrate (light source substrate) 18 on which a plurality of LEDs 17 are mounted, and a heat radiating member 21 having a low heat radiating portion 33 disposed in contact with the LED substrate 18 and partially low in heat radiation. The LED control unit 26 controls driving such that the one closest to the low heat dissipation unit 33 among the plurality of LED groups 31 becomes the luminance limited LED group 34. In this way, although the temperature of the LED substrate 18 easily rises locally due to the low heat dissipation portion 33 of the heat dissipation member 21, the LED group 31 closest to the low heat dissipation portion 33 becomes the luminance limited LED group 34. As described above, by controlling the driving by the LED control unit 26, it is possible to preferably suppress the temperature rise generated in the vicinity of the brightness limited LED group 34.

また、放熱部材２１は、ＬＥＤ基板１８が取り付けられるＬＥＤ基板取付部（光源基板取付部）２１ａと、ＬＥＤ基板取付部２１ａに連なるとともに導光板１９の板面に並行する形で延在して導光板１９と重畳配置される放熱部２１ｂと、を少なくとも有しており、ＬＥＤ基板１８には、配線部材（給電部材）２４が接続される基板側コネクタ（給電接続部）２３が放熱部２１ｂ側に向けて突出する形で設けられているのに対し、放熱部２１ｂのうち基板側コネクタ２３と重畳する部分には、低放熱部３３として開口部２１ｂ１が設けられている。配線部材２４が接続される基板側コネクタ２３は、ＬＥＤ基板１８において放熱部２１ｂ側に向けて突出する形で設けられているものの、放熱部２１ｂのうち基板側コネクタ２３と重畳する部分には、開口部２１ｂ１が設けられているので、基板側コネクタ２３を開口部２１ｂ１に通すことが可能とされる。開口部２１ｂ１は、放熱部２１ｂにおいて放熱性が局所的に低い低放熱部３３となるものの、開口部２１ｂ１に最も近いＬＥＤ群３１が輝度制限ＬＥＤ群３４となるようＬＥＤ制御部２６によって駆動を制御することで、輝度制限ＬＥＤ群３４付近に生じる温度上昇を好適に抑制することができる。   In addition, the heat dissipation member 21 extends in parallel to the plate surface of the light guide plate 19 while being continuous with the LED substrate attachment portion (light source substrate attachment portion) 21a to which the LED substrate 18 is attached and the LED substrate attachment portion 21a. A substrate side connector (feed connection portion) 23 to which the wiring member (feed member) 24 is connected is provided on the LED board 18 at least on the heat release portion 21b. An opening 21b1 is provided as a low heat dissipating portion 33 at a portion of the heat dissipating portion 21b which overlaps with the substrate-side connector 23, while the heat dissipating portion 33b is provided so as to project toward the surface of the substrate. Although the board side connector 23 to which the wiring member 24 is connected is provided in the LED board 18 so as to protrude toward the heat dissipation portion 21b, a portion of the heat dissipation portion 21b overlapping the substrate side connector 23 Since the opening 21b1 is provided, the substrate connector 23 can be passed through the opening 21b1. Although the opening 21b1 becomes the low heat dissipation part 33 whose heat dissipation is locally low in the heat dissipation part 21b, the drive is controlled by the LED control part 26 so that the LED group 31 closest to the opening 21b1 becomes the luminance limited LED group 34 By doing this, it is possible to preferably suppress the temperature rise that occurs in the vicinity of the luminance limited LED group 34.

また、ＬＥＤ基板１８は、ＬＥＤ群３１及び基板側コネクタ２３を複数ずつ有するとともに、入光端面１９ａに沿って複数が隣り合う形で並んで配されており、複数の基板側コネクタ２３は、ＬＥＤ基板１８において複数のＬＥＤ１７の並び方向について対称となる位置に配される。このようにすれば、複数のＬＥＤ基板１８を共通化することができるので、ＬＥＤ基板１８に係る製造コストを低下させる上で好適となる。   Further, the LED substrate 18 has a plurality of LED groups 31 and a plurality of substrate side connectors 23, and a plurality of the LED groups 31 and the substrate side connectors 23 are arranged side by side along the light incident end face 19a. It arrange | positions in the position which becomes symmetrical with respect to the row direction of several LED17 in the board | substrate 18. As shown in FIG. In this way, the plurality of LED substrates 18 can be made common, which is suitable for reducing the manufacturing cost of the LED substrates 18.

また、ＬＥＤ基板１８は、基板側コネクタ２３を２つ有するとともに、入光端面１９ａに沿って２つが隣り合う形で並んで配されており、２つの基板側コネクタ２３は、ＬＥＤ基板１８における並び方向についての中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに対して中央位置Ｃｐ側に偏在する。ＬＥＤ基板１８に配された複数のＬＥＤ群３１のうち、２つの基板側コネクタ２３が通される開口部２１ｂ１に最も近い２つのＬＥＤ群３１が輝度制限ＬＥＤ群３４とされる。従って、仮にＬＥＤ基板１８における並び方向についての中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに２つの基板側コネクタが配された場合に比べると、輝度制限ＬＥＤ群３４が上記中間位置ＩＰに対して中央位置ＣＰ側に偏在する分だけ、輝度制限ＬＥＤ群３４から発せられた光が導光板１９における並び方向についての中央側には供給され難くなる。つまり、最大輝度が制限されないＬＥＤ群３１から発せられた光が導光板１９における並び方向についての中央側に供給され易くなるので、導光板１９における並び方向についての中央側に供給される光量を十分に確保することができる。   Further, the LED substrate 18 has two substrate side connectors 23, and the two are arranged side by side along the light incident end face 19a, and the two substrate side connectors 23 are arranged in the LED substrate 18 With respect to the intermediate position IP between the central position CP and the end position EP with respect to the direction, it is localized on the central position Cp side. Of the plurality of LED groups 31 arranged on the LED substrate 18, the two LED groups 31 closest to the opening 21 b 1 through which the two substrate side connectors 23 are passed are set as the luminance limited LED group 34. Therefore, compared with the case where two board side connectors are disposed at the intermediate position IP between the center position CP and the end position EP in the alignment direction in the LED substrate 18, the brightness restricted LED group 34 is the intermediate position IP. On the other hand, the light emitted from the luminance limited LED group 34 is less likely to be supplied to the central side in the arrangement direction of the light guide plate 19 by the uneven distribution on the central position CP side. That is, light emitted from the LED group 31 whose maximum brightness is not limited is easily supplied to the center side in the arrangement direction of the light guide plate 19, so the light amount supplied to the center side in the arrangement direction of the light guide plate 19 is sufficient Can be secured.

また、ＬＥＤ制御部２６は、ＬＥＤ１７を周期的に点滅させ、点灯期間と消灯期間との時間比率を変化させるようにしている。このように、ＬＥＤ１７の発光状態を、いわゆるＰＷＭ（Pulse Width Modulation：パルス幅変調）方式により制御しているので、ＬＥＤ１７に付与する電圧値を一定にすることができてその制御に係る回路構成を簡単なものとすることができ、また調光範囲を十分に大きく確保できてＬＥＤ１７の発光状態をより適切に制御することができる。   The LED control unit 26 also blinks the LED 17 periodically to change the time ratio between the lighting period and the lighting period. As described above, since the light emission state of the LED 17 is controlled by a so-called PWM (Pulse Width Modulation) method, the voltage value applied to the LED 17 can be made constant, and the circuit configuration related to the control can be The light control state can be made simple, and the light control range can be sufficiently large, and the light emission state of the LED 17 can be controlled more appropriately.

また、本実施形態に係る液晶表示装置（表示装置）１０は、上記記載のバックライト装置１２と、バックライト装置１２から照射される光を利用して画像を表示する液晶パネル（表示パネル）１１と、を備える。このような構成の液晶表示装置１０によれば、ＬＥＤ群３１の温度上昇が抑制されるとともに、製造コストが好適に抑制されているので、信頼性に優れるとともに、製造コストを削減することができる。   The liquid crystal display device (display device) 10 according to the present embodiment includes the backlight device 12 described above and a liquid crystal panel (display panel) 11 that displays an image using light emitted from the backlight device 12. And. According to the liquid crystal display device 10 having such a configuration, the temperature rise of the LED group 31 is suppressed, and the manufacturing cost is suitably suppressed. Therefore, the reliability is excellent and the manufacturing cost can be reduced. .

また、本実施形態に係るテレビ受信装置１０ＴＶは、上記記載の液晶表示装置１０を備える。このようなテレビ受信装置１０ＴＶによれば、耐久性に優れるとともに、価格競争力に優れる。   The television receiver 10TV according to the present embodiment includes the liquid crystal display 10 described above. According to such a television receiver 10TV, the durability is excellent and the price competitiveness is excellent.

＜実施形態２＞
本発明の実施形態２を図１４によって説明する。この実施形態２では、ＬＥＤ基板１１８の設置数を３つに変更したものを示す。なお、上記した実施形態１と同様の構造、作用及び効果について重複する説明は省略する。 Second Embodiment
Embodiment 2 of the present invention will be described with reference to FIG. In the second embodiment, the number of installed LED substrates 118 is changed to three. In addition, the description which overlaps about the structure similar to Embodiment 1 mentioned above, an effect | action, and an effect is abbreviate | omitted.

本実施形態に係るＬＥＤ基板１１８は、図１４に示すように、Ｘ軸方向に沿って互いに隣り合う形で３つが並んで配されている。以下では、３つのＬＥＤ基板１１８を区別する場合は、中央のものを中央側ＬＥＤ基板１１８Ｃとし、両端のものを一対の端側ＬＥＤ基板１１８Ｅとする。各ＬＥＤ基板１１８には、ＬＥＤ群１３１が６つずつ備えられている。従って、ＬＥＤ群１３１のうち、図１４に示す右端に位置するものが第１ＬＥＤ群１３１Ａとされ、同図の左端に位置するものが第１８ＬＥＤ群１３１Ｒとされる。   As shown in FIG. 14, three LED substrates 118 according to the present embodiment are arranged side by side so as to be adjacent to each other along the X-axis direction. In the following, when the three LED substrates 118 are distinguished, the central one is the central side LED substrate 118C, and the two ends are the pair of end side LED substrates 118E. Each LED board 118 is provided with six LED groups 131. Therefore, among the LED groups 131, the one located at the right end shown in FIG. 14 is the first LED group 131A, and the one located at the left end in the figure is the eighteenth LED group 131R.

一対の端側ＬＥＤ基板１１８ＥにおいてＸ軸方向について対称位置に配される２つの基板側コネクタ１２３は、端側ＬＥＤ基板１１８ＥにおけるＸ軸方向についての中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに対して中央位置ＣＰ側に偏在している。これに対し、中央側ＬＥＤ基板１１８ＣにおいてＸ軸方向について対称位置に配される２つの基板側コネクタ１２３は、中央側ＬＥＤ基板１１８ＣにおけるＸ軸方向についての中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに対して端位置ＥＰ側に偏在している。従って、中央側ＬＥＤ基板１１８Ｃにおいて２つの基板側コネクタ１２３と平面に視て重畳する２つの開口部１２１ｂ１（低放熱部１３３）及びその最も近い配置となる第７ＬＥＤ群１３１Ｇ及び第１２ＬＥＤ群１３１Ｌについても、上記した中央側ＬＥＤ基板１１８Ｃの中間位置ＩＰに対して端位置ＥＰ側に偏在することになる。なお、本実施形態では、中央側ＬＥＤ群１３５には、第８ＬＥＤ群１３１Ｈから第１１ＬＥＤ群１３１Ｋまでが含まれ、端側ＬＥＤ群１３６には、第１ＬＥＤ群１３１Ａから第６ＬＥＤ群１３１Ｆまでと、第１３ＬＥＤ群１３１Ｍから第１８ＬＥＤ群１３１Ｒまでと、が含まれ、中間ＬＥＤ群１３７には、第７ＬＥＤ群１３１Ｇと、第１２ＬＥＤ群１３１Ｌと、が含まれる。このようにすれば、仮に中央側ＬＥＤ基板１１８Ｃにおいて中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに２つの基板側コネクタが配された場合に比べると、輝度制限ＬＥＤ群１３４である第７ＬＥＤ群１３１Ｇ及び第１２ＬＥＤ群１３１Ｌが上記中間位置ＩＰに対して端位置ＥＰ側に偏在する分だけ、輝度制限ＬＥＤ群１３４である第７ＬＥＤ群１３１Ｇ及び第１２ＬＥＤ群１３１Ｌから発せられた光が導光板におけるＸ軸方向についての中央側には供給され難くなる。つまり、最大輝度が制限されないＬＥＤ群１３１である中央側ＬＥＤ群１３５（第８ＬＥＤ群１３１Ｈから第１１ＬＥＤ群１３１Ｋまで）から発せられた光が導光板における並び方向についての中央側に供給され易くなるので、導光板における並び方向についての中央側に供給される光量を十分に確保することができる。   The two board side connectors 123 disposed at symmetrical positions in the X axis direction in the pair of end side LED boards 118E are intermediate positions between the center position CP and the end position EP in the X axis direction in the end side LED boards 118E. It is unevenly distributed to the central position CP side with respect to IP. On the other hand, the two substrate side connectors 123 arranged at symmetrical positions in the X axis direction in the center side LED substrate 118C are between the center position CP and the end position EP in the X axis direction in the center side LED substrate 118C. It is unevenly distributed to the end position EP with respect to the intermediate position IP. Therefore, the two opening portions 121b1 (low heat dissipation portion 133) overlapping in plan view with the two substrate side connectors 123 in the center side LED substrate 118C and the seventh LED group 131G and the twelfth LED group 131L in the closest arrangement thereof With respect to the middle position IP of the center side LED substrate 118C described above, it is unevenly distributed on the end position EP side. In the present embodiment, the central LED group 135 includes the eighth LED group 131H to the eleventh LED group 131K, and the end LED group 136 includes the first LED group 131A to the sixth LED group 131F. The thirteenth LED group 131M to the eighteenth LED group 131R are included, and the intermediate LED group 137 includes a seventh LED group 131G and a twelfth LED group 131L. In this way, if the two substrate side connectors are disposed at an intermediate position IP between the center position CP and the end position EP in the center side LED substrate 118C, the brightness restricted LED group 134 The light emitted from the seventh LED group 131G and the twelfth LED group 131L, which are the luminance limited LED group 134, is a light guide plate because the 7 LED group 131G and the twelfth LED group 131L are unevenly distributed on the end position EP side with respect to the intermediate position IP. It becomes difficult to be supplied to the center side in the X axis direction in. That is, light emitted from the central LED group 135 (from the eighth LED group 131H to the eleventh LED group 131K), which is the LED group 131 whose maximum luminance is not limited, is easily supplied to the central side in the arrangement direction of the light guide plate A sufficient amount of light can be supplied to the central side of the light guide plate in the direction of alignment.

一方、各端側ＬＥＤ基板１１８Ｅにおいて２つずつの基板側コネクタ１２３と平面に視て重畳する２つずつの開口部１２１ｂ１（低放熱部１３３）及びその最も近い配置となる第３ＬＥＤ群１３１Ｃ、第４ＬＥＤ群１３１Ｄ、第１５ＬＥＤ群１３１Ｏ及び第１６ＬＥＤ群１３１Ｐについても、上記した各端側ＬＥＤ基板１１８Ｅの中間位置ＩＰに対して中央位置ＣＰ側に偏在することになる。このようにすれば、仮に各端側ＬＥＤ基板１１８Ｅにおいて中央位置ＣＰと端位置ＥＰとの間の中間位置ＩＰに２つの基板側コネクタが配された場合に比べると、輝度制限ＬＥＤ群１３４である第３ＬＥＤ群１３１Ｃ、第４ＬＥＤ群１３１Ｄ、第１５ＬＥＤ群１３１Ｏ及び第１６ＬＥＤ群１３１Ｐが上記中間位置ＩＰに対して中央位置ＣＰ側に偏在する分だけ、輝度制限ＬＥＤ群１３４である第３ＬＥＤ群１３１Ｃ、第４ＬＥＤ群１３１Ｄ、第１５ＬＥＤ群１３１Ｏ及び第１６ＬＥＤ群１３１Ｐから発せられた光が導光板におけるＸ軸方向についての中央側には供給され難くなる。   On the other hand, in each end-side LED substrate 118E, two openings 121b1 (low heat dissipation portion 133) and third LED group 131C, which are arranged closest to each other, overlap each other in plan view with two board-side connectors 123; The four LED group 131D, the fifteenth LED group 131O, and the sixteenth LED group 131P are also unevenly distributed on the central position CP side with respect to the intermediate position IP of each of the end side LED substrates 118E described above. In this way, the brightness limited LED group 134 is provided compared to the case where two board side connectors are disposed at the intermediate position IP between the center position CP and the end position EP in each end side LED board 118E. The third LED group 131C, which is the brightness-limited LED group 134, is the third LED group 131C, the fourth LED group 131D, the fifteenth LED group 131O, and the sixteenth LED group 131P that are unevenly distributed to the central position CP side with respect to the intermediate position IP. It becomes difficult for the light emitted from the 4 LED group 131D, the 15th LED group 131O and the 16th LED group 131P to be supplied to the central side in the X axis direction in the light guide plate.

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
（１）上記した各実施形態では、放熱部材の放熱部に形成された開口部を低放熱部とした場合を例示したが、開口部以外の部位が低放熱部となるケースも勿論あり得る。例えば、放熱部の長さが部分的に異なる構成において、放熱部が短くなる部分が低放熱部となり得る。その他にも、放熱部材がシャーシに対して部分的に接する構成において、放熱部材のうちシャーシとは非接触となる部分が低放熱部となり得る。また、放熱部材が、熱伝導性が異なる複数の部材に接触する構成において、放熱部材が相対的に熱伝導性が低い部材に接する部分が低放熱部となり得る。
（２）上記した各実施形態では、ＬＥＤ基板の設置数が３つとされた場合を示したが、ＬＥＤ基板の設置数は４つ以上であっても構わない。その場合、ＬＥＤ基板の設置数が４，６などの偶数の場合は、実施形態１に記載した構成（基板側コネクタが中間位置に対して中央位置側に偏在する構成）を採るのが好ましい。一方、ＬＥＤ基板の設置数が５，７などの奇数の場合は、実施形態２に記載した構成（中央側ＬＥＤ基板において基板側コネクタが中間位置に対して端位置側に偏在する構成）を採るのが好ましい。
（３）上記した各実施形態以外にも、輝度制限ＬＥＤ群、中央側ＬＥＤ群、端側ＬＥＤ群、中間ＬＥＤ群に含ませる具体的なＬＥＤ群の数や配置などは、適宜に変更可能である。
（４）上記した各実施形態以外にも、ＬＥＤ基板に対するＬＥＤ群の設置数、ＬＥＤ群の設置総数、ＬＥＤ群に含まれるＬＥＤの数などの具体的な数値は、適宜に変更可能である。
（５）上記した各実施形態では、ＬＥＤ基板において基板側コネクタが対称となる位置に配された場合を示したが、ＬＥＤ基板において基板側コネクタが非対称となる位置に配されていても構わない。また、ＬＥＤ基板における基板側コネクタの設置数は１つまたは３つ以上に変更することも可能である。
（６）上記した各実施形態以外にも、液晶パネルの具体的な画面サイズは、適宜に変更可能であり、例えば６０インチより小さくすることも勿論可能である。
（７）上記した各実施形態では、頂面発光型のＬＥＤを示したが、側面発光型のＬＥＤを光源として用いることも可能である。また、ＬＥＤ以外の光源（有機ＥＬなど）を用いることも可能である。
（８）上記した各実施形態では、導光板の外周端面における一方の長辺側の端面を入光端面とした片側入光タイプのバックライト装置を例示したが、導光板の外周端面におけるいずれか一方の短辺側の端面を入光端面とした片側入光タイプのバックライト装置であっても構わない。また、導光板の外周端面における一対の長辺側の端面または一対の短辺側の端面をそれぞれ入光端面とした両側入光タイプのバックライト装置であっても構わない。
（９）上記した各実施形態では、液晶表示装置（液晶パネルやバックライト装置）の平面形状が横長の方形とされる場合を示したが、液晶表示装置の平面形状が縦長の方形、正方形、長円形状、楕円形状、円形、台形、部分的に曲面を持つ形状などであっても構わない。
（１０）上記した各実施形態以外にも、液晶表示装置の具体的な用途などは適宜に変更可能である。 Other Embodiments
The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each embodiment described above, although the case where the opening formed in the heat dissipation portion of the heat dissipation member is used as the low heat dissipation portion is illustrated, it is of course possible that a portion other than the opening becomes the low heat dissipation portion. For example, in a configuration in which the length of the heat dissipation portion is partially different, the portion where the heat dissipation portion is short can be the low heat dissipation portion. In addition, in the configuration in which the heat dissipating member is partially in contact with the chassis, a portion of the heat dissipating member which is not in contact with the chassis can be a low heat dissipating portion. Further, in the configuration in which the heat dissipating member is in contact with a plurality of members having different heat conductivity, a portion where the heat dissipating member is in contact with a member having a relatively low heat conductivity can be a low heat dissipating portion.
(2) In each embodiment described above, the case where the number of installed LED substrates is three is shown, but the number of installed LED substrates may be four or more. In that case, in the case where the number of installed LED substrates is an even number such as 4, 6, etc., it is preferable to adopt the configuration described in Embodiment 1 (a configuration in which the substrate side connector is biased to the central position side with respect to the intermediate position). On the other hand, in the case where the number of installed LED substrates is an odd number such as 5, 7, etc., the configuration described in Embodiment 2 (configuration in which the substrate side connector is unevenly distributed to the end position side with respect to the middle position in the center side LED substrate) is employed. Is preferred.
(3) Besides the above-described embodiments, the number and arrangement of specific LED groups included in the luminance limited LED group, the center side LED group, the end side LED group, and the middle LED group can be appropriately changed. is there.
(4) Other than the above-described embodiments, specific numerical values such as the number of installed LED groups on the LED substrate, the total number of installed LED groups, and the number of LEDs included in the LED group can be appropriately changed.
(5) In each embodiment described above, the case where the substrate side connector is disposed at the symmetrical position in the LED substrate is shown, but the substrate side connector may be disposed at the asymmetric position in the LED substrate. . In addition, the number of board-side connectors in the LED board can be changed to one or three or more.
(6) Other than the above-described embodiments, the specific screen size of the liquid crystal panel can be appropriately changed. For example, the screen size can be made smaller than 60 inches, for example.
(7) In each of the above-described embodiments, the top surface emission type LED is shown, but it is also possible to use a side surface emission type LED as a light source. Moreover, it is also possible to use light sources (organic EL etc.) other than LED.
(8) In each of the above-described embodiments, the one-side light entering type backlight device in which the end face on one long side in the outer peripheral end face of the light guide plate is the light incident end is illustrated. It may be a single-sided light entering type backlight device in which the end face on one short side is the light entering end face. In addition, it may be a both-side light entering type backlight device in which the end surfaces on the side of the long side of the pair of long sides and the end surfaces on the side of the short side on the outer peripheral end face of the light guide plate are light receiving end faces.
(9) In each embodiment described above, the planar shape of the liquid crystal display device (liquid crystal panel or backlight device) is a horizontally long square, but the planar shape of the liquid crystal display device is a vertically long square, square, It may be an oval shape, an oval shape, a circle, a trapezoid, a shape having a partial curved surface, or the like.
(10) Other than the embodiments described above, the specific application of the liquid crystal display device can be changed as appropriate.

１０…液晶表示装置（表示装置）、１１…液晶パネル（表示パネル）、１２…バックライト装置（照明装置）、１７…ＬＥＤ（光源）、１８，１１８…ＬＥＤ基板（光源基板）、１９…導光板、１９ａ…入光端面、２１…放熱部材、２１ａ…ＬＥＤ基板取付部（光源基板取付部）、２１ｂ…放熱部、２１ｂ１，１２１ｂ１…開口部、２３，１２３…基板側コネクタ（給電接続部）、２４…配線部材（給電部材）、２６…ＬＥＤ制御部（光源制御部）、３１，１３１…ＬＥＤ群（光源群）、３３，１３３…低放熱部、３４，１３４…輝度制限ＬＥＤ群（輝度制限光源群）、３５，１３５…中央側ＬＥＤ群（中央側光源群）、３６…端側ＬＥＤ群（端側光源群）、３７…中間ＬＥＤ群（中間光源群）、ＣＰ…中央位置、ＥＰ…端位置、ＩＰ…中間位置   DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Back light apparatus (illumination device), 17 ... LED (light source), 18, 118 ... LED board (light source board), 19 ... Conduction Optical plate, 19a: Light incident end face, 21: Heat dissipation member, 21a: LED board mounting portion (light source board mounting portion), 21b: Heat radiating portion, 21b1, 121b1: Opening, 23, 123: Board side connector (feed connection portion) 24: Wiring member (power supply member) 26: LED control unit (light source control unit) 31, 131: LED group (light source group) 33: 133: low heat dissipation unit 34, 134: luminance limited LED group (brightness Limited light source group), 35, 135 central side LED group (central side light source group) 36 end side LED group (end side light source group) 37 intermediate LED group (intermediate light source group) CP central position EP ... end position, IP ... middle Location

Claims (11)

外周端面の少なくとも一部に光が入射される入光端面を有する導光板と、
前記入光端面に沿って一列に並ぶ複数の光源と、
複数の前記光源のうち、連続して並ぶ複数ずつの前記光源からなる複数の光源群と、
複数の前記光源群に最大輝度が制限された輝度制限光源群が選択的に含まれるよう、複数の前記光源群の駆動を制御する光源制御部と、を備える照明装置。 A light guide plate having a light incident end face on which light is incident on at least a part of the outer circumferential end face;
A plurality of light sources arranged in a line along the light entrance end;
A plurality of light source groups consisting of a plurality of the light sources arranged in series among the plurality of light sources;
And a light source control unit configured to control driving of the plurality of light source groups such that the plurality of light source groups selectively include a luminance limited light source group whose maximum luminance is limited. 複数の前記光源群には、複数の前記光源の並び方向について相対的に中央側に配される中央側光源群と、前記並び方向について相対的に端側に配される端側光源群と、が少なくとも含まれており、
前記光源制御部は、前記端側光源群に前記輝度制限光源群が含まれてその最大輝度が前記中央側光源群に係る最大輝度よりも低くなるよう制御する請求項１記載の照明装置。 The plurality of light source groups includes: a central side light source group disposed relatively on the center side in the arrangement direction of the plurality of light sources; and an end side light source group disposed relatively on the end side in the arrangement direction. Is at least included,
The lighting device according to claim 1, wherein the light source control unit controls the end side light source group to include the brightness limited light source group so that the maximum brightness thereof is lower than the maximum brightness of the center side light source group. 複数の前記光源群には、前記並び方向について前記中央側光源群と前記端側光源群との間に配される中間光源群が含まれており、
前記光源制御部は、前記中間光源群に前記輝度制限光源群が含まれてその最大輝度が前記中央側光源群に係る最大輝度よりも低いものの、前記端側光源群に係る最大輝度よりは高くなるよう制御する請求項２記載の照明装置。 The plurality of light source groups include an intermediate light source group disposed between the central side light source group and the end side light source group in the arrangement direction,
Although the light source control unit includes the brightness limited light source group in the intermediate light source group and the maximum brightness thereof is lower than the maximum brightness of the central light source group, it is higher than the maximum brightness of the end light source group The lighting device according to claim 2, wherein the lighting device is controlled to 前記光源制御部は、前記中央側光源群については最大輝度が１００％となるよう駆動を制御する請求項２または請求項３記載の照明装置。   The lighting device according to claim 2 or 3, wherein the light source control unit controls driving so that the maximum luminance of the central light source group is 100%. 複数の前記光源が実装される光源基板と、前記光源基板に接する形で配されて部分的に放熱性が低い低放熱部を有する放熱部材と、を備えており、
前記光源制御部は、複数の前記光源群のうち、前記低放熱部に最も近いものが前記輝度制限光源群となるよう駆動を制御する請求項１から請求項４のいずれか１項に記載の照明装置。 A light source substrate on which a plurality of the light sources are mounted, and a heat radiating member disposed in contact with the light source substrate and having a low heat radiating portion having a partially low heat radiating property;
The light source control unit according to any one of claims 1 to 4, wherein the light source control unit controls driving such that the one closest to the low heat dissipation unit among the plurality of light source groups is the luminance limited light source group. Lighting device. 前記放熱部材は、前記光源基板が取り付けられる光源基板取付部と、前記光源基板取付部に連なるとともに前記導光板の板面に並行する形で延在して前記導光板と重畳配置される放熱部と、を少なくとも有しており、
前記光源基板には、給電部材が接続される給電接続部が前記放熱部側に向けて突出する形で設けられているのに対し、前記放熱部のうち前記給電接続部と重畳する部分には、前記低放熱部として開口部が設けられている請求項５記載の照明装置。 The heat dissipation member extends from the light source substrate attachment portion to which the light source substrate is attached and the light source substrate attachment portion and extends parallel to the surface of the light guide plate, and is disposed so as to overlap the light guide plate. And at least
A feeding connection portion to which a feeding member is connected is provided on the light source substrate so as to protrude toward the heat dissipation portion, whereas a portion overlapping the power feeding connection portion in the heat dissipation portion is provided on the light source substrate. The lighting device according to claim 5, wherein an opening is provided as the low heat dissipation part. 前記光源基板は、前記光源群及び前記給電接続部を複数ずつ有するとともに、前記入光端面に沿って複数が隣り合う形で並んで配されており、
複数の前記給電接続部は、前記光源基板において複数の前記光源の並び方向について対称となる位置に配される請求項６記載の照明装置。 The light source substrate has a plurality of the light source group and the feeding connection portion, and a plurality of the light source substrates are arranged side by side along the light incident end face.
The lighting device according to claim 6, wherein the plurality of feed connections are arranged at positions symmetrical with respect to the direction in which the plurality of light sources are arranged in the light source substrate. 前記光源基板は、前記給電接続部を２つ有するとともに、前記入光端面に沿って２つが隣り合う形で並んで配されており、
２つの前記給電接続部は、前記光源基板における前記並び方向についての中央位置と端位置との間の中間位置に対して前記中央位置側に偏在する請求項７記載の照明装置。 The light source substrate has two of the feed connection portions, and the two are arranged side by side along the light incident end face,
The lighting device according to claim 7, wherein the two feed connections are biased toward the central position with respect to an intermediate position between the central position and the end position in the arranging direction in the light source substrate. 前記光源制御部は、前記光源を周期的に点滅させ、点灯期間と消灯期間との時間比率を変化させるようにしている請求項１から請求項８のいずれか１項に記載の照明装置。   The lighting device according to any one of claims 1 to 8, wherein the light source control unit blinks the light source periodically to change a time ratio of a lighting period and a light-off period. 請求項１から請求項９のいずれか１項に記載の照明装置と、
前記照明装置から照射される光を利用して画像を表示する表示パネルと、を備える表示装置。 A lighting device according to any one of claims 1 to 9,
A display panel that displays an image using light emitted from the lighting device. 請求項１０に記載された表示装置を備えるテレビ受信装置。   A television receiver comprising the display device according to claim 10.
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