JP2007317423A - Backlight unit - Google Patents

Backlight unit Download PDF

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JP2007317423A
JP2007317423A JP2006143940A JP2006143940A JP2007317423A JP 2007317423 A JP2007317423 A JP 2007317423A JP 2006143940 A JP2006143940 A JP 2006143940A JP 2006143940 A JP2006143940 A JP 2006143940A JP 2007317423 A JP2007317423 A JP 2007317423A
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unit
backlight unit
leds
led
luminance
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Shota Ikebe
翔太 池辺
Toshiaki Shiba
俊明 司馬
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Toshiba Lighting and Technology Corp
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Harison Toshiba Lighting Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED backlight unit so adjusted to have different levels of luminance at a place where high luminance is required and elsewhere in accordance with luminance distribution required on a light-emitting face of the unit. <P>SOLUTION: In the backlight unit with a number of LEDs 2 arranged at a unit bottom part 1, distribution density of LEDs 2 at a place where a higher luminance is required than others is made higher than that of other places, in accordance with luminance distribution necessary as a backlight unit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、液晶表示装置のバックライトユニットに関する。   The present invention relates to a backlight unit of a liquid crystal display device.

従来、液晶表示装置の光源をなすバックライトユニットとして、図９〜図１１に示す構成のものが広く採用されている。この従来のバックライトユニットは、多数個のＬＥＤ２を直線状に実装したＬＥＤ基板３の複数体をユニット底板１上に列設し、列設された複数体のＬＥＤ基板３の前面側に光拡散用や集光用の各種光学シート４を配置した構成である。そして、ユニットの発光面全体でほぼ均一な輝度分布となるように、各ＬＥＤ基板３におけるＬＥＤ２の配列ピッチは等間隔にしている。また、ＬＥＤ基板３の肉厚も、長さ方向で均一なものにしている。   Conventionally, as a backlight unit that constitutes a light source of a liquid crystal display device, one having a configuration shown in FIGS. 9 to 11 has been widely adopted. In this conventional backlight unit, a plurality of LED substrates 3 on which a large number of LEDs 2 are mounted in a straight line are arranged on the unit bottom plate 1, and light diffusion is performed on the front side of the arranged plurality of LED substrates 3. This is a configuration in which various optical sheets 4 for light collection and light collection are arranged. The arrangement pitch of the LEDs 2 on each LED board 3 is set at an equal interval so as to obtain a substantially uniform luminance distribution over the entire light emitting surface of the unit. Moreover, the thickness of the LED substrate 3 is also made uniform in the length direction.

ところで近年、例えば、特開２００２−５５６７５号公報（特許文献１）に記載されているように、人間の瞳が円であるため、ユニット発光面の中心部の輝度を高くすることで視覚上の輝度ムラを目立ちにくくする技術が提案されている。   In recent years, for example, as described in Japanese Patent Application Laid-Open No. 2002-55675 (Patent Document 1), since the human pupil is a circle, the luminance of the center of the unit light emitting surface is increased to increase the visual level. Techniques have been proposed for making uneven brightness inconspicuous.

ところが、従来、ＬＥＤを光源とする直下式バックライトユニットでは、上述したように多数個のＬＥＤを等ピッチに配列したＬＥＤ基板を複数体列設したものしか知られておらず、ユニットの発光面に要求される不均等な輝度分布に応じて高い輝度が要求される場所とそうではない場所とで異なった輝度になるように電気的に調整されあるいは物理的に配列された多数のＬＥＤを光源とするバックライトユニットは知られていない。
特開２００２−５５６７５号公報 However, conventionally, in a direct backlight unit using LEDs as a light source, only a plurality of LED substrates in which a large number of LEDs are arranged at an equal pitch as described above is known, and the light emitting surface of the unit is known. A plurality of LEDs that are electrically adjusted or physically arranged so as to have different brightness between a place where high brightness is required and a place where high brightness is not required according to the uneven brightness distribution required for the light source The backlight unit is not known.
JP 2002-55675 A

本発明は、上述した従来の技術的課題に鑑みてなされたもので、ユニットの発光面に要求される不均等な輝度分布に応じて高い輝度が要求される場所とそうではない場所とで異なった輝度になるように電気的に調整されあるいは物理的に配列された多数のＬＥＤを光源とするバックライトユニットを提供することを目的とする。   The present invention has been made in view of the above-described conventional technical problems, and is different between a place where high luminance is required according to an uneven luminance distribution required for the light emitting surface of the unit and a place where it is not. An object of the present invention is to provide a backlight unit having a number of LEDs that are electrically adjusted or physically arranged so as to have a high luminance as a light source.

請求項１の発明は、多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの分布密度を、他の場所のＬＥＤの分布密度よりも高い配置にしたことを特徴とする。   According to the first aspect of the present invention, in a backlight unit in which a large number of LEDs are used as light sources and arranged at the bottom of the unit, according to the luminance distribution required for the backlight unit, The LED distribution density is higher than the LED distribution density at other locations.

請求項２の発明は、多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの高さを、他の場所のＬＥＤよりも高い配置にしたことを特徴とする。   According to the invention of claim 2, in a backlight unit in which a large number of LEDs are used as light sources and arranged at the bottom of the unit, according to the luminance distribution required for the backlight unit, a place requiring higher brightness than other places It is characterized in that the height of the LED is higher than that of the LED in other places.

請求項３の発明は、多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの印加電流を、他の場所のＬＥＤの印加電流よりも高くしたことを特徴とする。   The invention of claim 3 is a backlight unit in which a large number of LEDs are used as a light source and arranged at the bottom of the unit. According to the luminance distribution required for the backlight unit, a place that requires higher brightness than other places. The applied current of the LED is higher than the applied current of the LED in other places.

本発明のバックライトユニットによれば、多数個のＬＥＤの印加電流を電気的に調整しあるいは多数個のＬＥＤの物理的な配列を調整することで、高い輝度が要求される場所では高い輝度に、そうではない場所では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布が実現できる。   According to the backlight unit of the present invention, by adjusting the applied current of a large number of LEDs or adjusting the physical arrangement of the large number of LEDs, the luminance can be increased in a place where a high luminance is required. In other places, it is possible to achieve a luminance distribution corresponding to the uneven luminance distribution required for the light emitting surface of the unit by making the luminance relatively low.

以下、本発明の実施の形態を図に基づいて詳説する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（第１の実施の形態）図１を用いて本発明の第１の実施の形態のバックライトユニットについて説明する。本実施の形態のバックライトユニットの全体的な構成は図９〜図１１に示した従来例と同様であり、多数個のＬＥＤ２を直線状に実装したＬＥＤ基板３をユニット底板１上に列設し、列設された複数体のＬＥＤ基板３の前面側に光拡散用や集光用の各種光学シート４を配置している。   (First Embodiment) A backlight unit according to a first embodiment of the present invention will be described with reference to FIG. The overall configuration of the backlight unit of the present embodiment is the same as that of the conventional example shown in FIGS. 9 to 11, and an LED substrate 3 on which a large number of LEDs 2 are linearly mounted is arranged on the unit bottom plate 1. Then, various optical sheets 4 for light diffusion and light collection are arranged on the front side of the plurality of LED substrates 3 arranged in a row.

そして本実施の形態では、その特徴として、ＬＥＤ基板３に直線状に実装した多数個のＬＥＤ２の配列ピッチを、ユニットの発光面全体として高い輝度が要求される中心部に相当するＬＥＤ基板３の長さ方向の中間部では狭くしてＬＥＤ２を密集させ、ユニットの発光面全体として高い輝度が要求されないＬＥＤ基板３の長さ方向の両端に近づくにつれて広くしてＬＥＤ２の密度を疎にしている。   In this embodiment, the feature is that the arrangement pitch of a large number of LEDs 2 linearly mounted on the LED substrate 3 is the same as that of the LED substrate 3 corresponding to the central portion where high luminance is required for the entire light emitting surface of the unit. The LEDs 2 are densely packed in the middle portion in the length direction, and the density of the LEDs 2 is made sparse so as to approach the both ends in the length direction of the LED substrate 3 where high luminance is not required for the entire light emitting surface of the unit.

本実施の形態のバックライトユニットによれば、多数個のＬＥＤ２の物理的な配列を調整することで、高い輝度が要求されるユニット発光面の中心部では高い輝度に、そうではない周辺部では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   According to the backlight unit of the present embodiment, by adjusting the physical arrangement of a large number of LEDs 2, high brightness is required at the center of the unit light emitting surface where high brightness is required, and in peripheral areas where this is not the case. A large number of LEDs can be made to emit light so as to have a relatively low luminance and a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

（第２の実施の形態）図２を用いて本発明の第２の実施の形態のバックライトユニットについて説明する。本実施の形態のバックライトユニットの全体的な構成は図９、図１０に示した従来例と同様であり、多数個のＬＥＤ２を直線状に実装したＬＥＤ基板３をユニット底板１上に列設し、列設された複数体のＬＥＤ基板３の前面側に光拡散用や集光用の各種光学シート４を配置している。   (Second Embodiment) A backlight unit according to a second embodiment of the present invention will be described with reference to FIG. The overall configuration of the backlight unit of the present embodiment is the same as that of the conventional example shown in FIGS. 9 and 10, and LED substrates 3 on which a large number of LEDs 2 are mounted in a straight line are arranged on the unit bottom plate 1. Then, various optical sheets 4 for light diffusion and light collection are arranged on the front side of the plurality of LED substrates 3 arranged in a row.

そして本実施の形態では、ＬＥＤ基板３上の多数個のＬＥＤ２の配列は等ピッチにしながらも、各ＬＥＤ２に印加する電流値をユニットの発光面全体として高い輝度が要求される中心部に相当するＬＥＤ基板３の長さ方向の中間部のＬＥＤ群に対しては例えばＩＬＥＤ＝１６ｍＡと大きくし、中間部よりも外側のＬＥＤ群に対して例えばＩＬＥＤ＝１５ｍＡと少し小さくし、ユニットの発光面全体として高い輝度が要求されないＬＥＤ基板３の長さ方向の両端部近くのＬＥＤ群に対しては例えばＩＬＥＤ＝１４ｍＡとさらに小さくしている。 In the present embodiment, the arrangement of a large number of LEDs 2 on the LED substrate 3 corresponds to a central portion where the current value applied to each LED 2 is required to have high luminance as the entire light emitting surface of the unit, while having an equal pitch. For the LED group in the middle part of the LED substrate 3 in the length direction, for example, I LED = 16 mA is increased, and for the LED group outside the intermediate part, for example, I LED = 15 mA is set slightly smaller, for example, the light emission of the unit For an LED group near the both ends in the length direction of the LED substrate 3 where high luminance is not required as a whole surface, for example, I LED = 14 mA is further reduced.

本実施の形態のバックライトユニットによれば、多数個のＬＥＤ２それぞれに印加する電流値を調整することで、高い輝度が要求されるユニット発光面の中心部では大きな電流を流し、そうではない周辺部では比較的小さな電流を流すようにして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   According to the backlight unit of the present embodiment, by adjusting the current value applied to each of the plurality of LEDs 2, a large current flows at the center of the unit light emitting surface where high luminance is required, and the surrounding area where this is not the case In the unit, a relatively small current is allowed to flow so that a large number of LEDs can emit light so as to have a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

（第３の実施の形態）図３、図４を用いて本発明の第３の実施の形態のバックライトユニットについて説明する。本実施の形態のバックライトユニットの全体的な構成は図９、図１０に示した従来例と同様であり、多数個のＬＥＤ２を直線状に実装したＬＥＤ基板３をユニット底板１上に列設し、列設された複数体のＬＥＤ基板３の前面側に光拡散用や集光用の各種光学シート４を配置している。   (Third Embodiment) A backlight unit according to a third embodiment of the present invention will be described with reference to FIGS. The overall configuration of the backlight unit of the present embodiment is the same as that of the conventional example shown in FIGS. 9 and 10, and LED substrates 3 on which a large number of LEDs 2 are mounted in a straight line are arranged on the unit bottom plate 1. Then, various optical sheets 4 for light diffusion and light collection are arranged on the front side of the plurality of LED substrates 3 arranged in a row.

そして本実施の形態では、多数のＬＥＤ２の配列が等ピッチになったＬＥＤ基板３を、ユニット発光面全体として高輝度が要求される場所の直下に配置している。本実施の形態の場合、発光面の中心部では高輝度が要求されるため、その中心部の直下にＬＥＤ基板３が位置するように奇数体のＬＥＤ基板、ここでは５体のＬＥＤ基板３を列設している。   In the present embodiment, the LED substrate 3 in which the arrangement of a large number of LEDs 2 has an equal pitch is arranged directly below a place where high luminance is required as the entire unit light emitting surface. In the case of the present embodiment, high luminance is required at the central portion of the light emitting surface. Therefore, an odd number of LED substrates, in this case, five LED substrates 3 are arranged so that the LED substrate 3 is located immediately below the central portion. Lined up.

本実施の形態のバックライトユニットにあっても、多数個のＬＥＤ２の物理的な配列を調整することで、高い輝度が要求されるユニット発光面の中心部では高い輝度に、そうではない周辺部では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   Even in the backlight unit of the present embodiment, by adjusting the physical arrangement of a large number of LEDs 2, high brightness is required at the center of the unit light emitting surface where high brightness is required, and peripheral areas that are not. Then, it is possible to make a large number of LEDs emit light so as to have a relatively low luminance and a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

（第４の実施の形態）図５、図６を用いて本発明の第４の実施の形態のバックライトユニットについて説明する。本実施の形態の特徴は、図３、図４に示した第３の実施の形態に対してＬＥＤ基板３の配列、またＬＥＤ基板３上の多数個のＬＥＤの配列については同様であるが、ＬＥＤ基板３として、高輝度発光を要求される場所の直下に位置するものについては肉厚を厚いもの（３Ａ）を採用し、それほど高い輝度を要求されない場所に位置するものについては肉厚を薄いもの（３Ｃ）を採用し、中間の輝度を要求される場所に位置するものについては中間の厚さの肉厚のもの（３Ｂ）を採用した点にある。   (Fourth Embodiment) A backlight unit according to a fourth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is the same as the arrangement of the LED board 3 and the arrangement of a plurality of LEDs on the LED board 3 in the third embodiment shown in FIGS. As the LED substrate 3, a thicker one (3A) is used for those located immediately below a place where high luminance light emission is required, and a thin thickness is used for those located in places where high luminance is not required. The thing (3C) is used, and the thing located in a place where intermediate brightness is required is the point that the medium thickness (3B) is adopted.

これにより、本実施の形態のバックライトにあっても、多数個のＬＥＤ２の物理的な配列を調整することで、高い輝度が要求されるユニット発光面の中心部では高い輝度に、そうではない周辺部では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   As a result, even in the backlight according to the present embodiment, by adjusting the physical arrangement of a large number of LEDs 2, high brightness is not obtained at the center of the unit light emitting surface where high brightness is required. A large number of LEDs can be made to emit light so as to have a relatively low luminance at the peripheral portion and a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

（第５の実施の形態）図７を用いて本発明の第５の実施の形態のバックライトユニットについて説明する。本実施の形態の特徴は、図９〜図１１に示した従来例のバックライトユニットに対して、ＬＥＤ基板３の配列、またＬＥＤ基板３上の多数個のＬＥＤの配列については同様であるが、各ＬＥＤ基板３の肉厚を不均等にして、高輝度発光を要求される場所の直下に相当する中間部では肉厚Ｔ１を厚くし、それほど高い輝度を要求されない場所の直下に相当する端部では肉厚Ｔ２を薄くした（Ｔ１＞Ｔ２）ものを採用した点にある。   (Fifth Embodiment) A backlight unit according to a fifth embodiment of the present invention will be described with reference to FIG. The feature of the present embodiment is the same as the arrangement of the LED board 3 and the arrangement of a large number of LEDs on the LED board 3 with respect to the conventional backlight unit shown in FIGS. The thickness of each LED board 3 is made uneven, and the thickness T1 is increased in the middle portion corresponding to the portion directly under the place where high luminance light emission is required, and the edge corresponding to the portion immediately under the place where the high luminance is not required. In the part, the thickness T2 is reduced (T1> T2).

尚、本実施の形態にあっては、ＬＥＤ基板３の肉厚を不均等にする代りに、均等な肉厚のＬＥＤ基板に対して、その長さ方向の中間部が発光面側に盛り上がるように湾曲させることができ、あるいはフレーム底板１側の同部分が盛り上がるようにしてもよい。   In the present embodiment, instead of making the thickness of the LED substrate 3 uneven, an intermediate portion in the length direction of the LED substrate with an equal thickness is raised to the light emitting surface side. Or the same part on the frame bottom plate 1 side may be raised.

これにより、本実施の形態のバックライトにあっても、多数個のＬＥＤ２の物理的な配列を調整することで、高い輝度が要求されるユニット発光面の中心部では高い輝度に、そうではない周辺部では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   As a result, even in the backlight according to the present embodiment, by adjusting the physical arrangement of a large number of LEDs 2, high brightness is not obtained at the center of the unit light emitting surface where high brightness is required. A large number of LEDs can be made to emit light so as to have a relatively low luminance at the peripheral portion and a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

（第６の実施の形態）図８を用いて本発明の第６の実施の形態のバックライトユニットについて説明する。本実施の形態のバックライトユニットの全体的な構成は図９〜図１１に示した従来例と同様であり、多数個のＬＥＤ２を実装したＬＥＤ基板３の複数体をユニット底板１上に列設し、列設された複数体のＬＥＤ基板３の前面側に光拡散用や集光用の各種光学シート４を配置している。   (Sixth Embodiment) A backlight unit according to a sixth embodiment of the present invention will be described with reference to FIG. The overall configuration of the backlight unit of the present embodiment is the same as that of the conventional example shown in FIGS. 9 to 11, and a plurality of LED substrates 3 on which a large number of LEDs 2 are mounted are arranged on the unit bottom plate 1. Then, various optical sheets 4 for light diffusion and light collection are arranged on the front side of the plurality of LED substrates 3 arranged in a row.

そして本実施の形態では、その特徴として、複数体のＬＥＤ基板のうち中側２体については従来例と同様の直線状に等ピッチで多数個のＬＥＤ２を配列したＬＥＤ基板３を採用し、外側２体については、平面上で湾曲した形状のＬＥＤ基板３Ｄを採用し、これらをユニット底板１上に図８に示すように配設している。つまり、外側２体の湾曲したＬＥＤ基板３Ｄについては、その湾曲して凸になっている部分が中央寄りに位置する姿勢で配設している。尚、ＬＥＤ基板３Ｄのように湾曲した形状にする代りに、ＬＥＤ２の配列だけを弓状の配列に変更することも可能である。   In the present embodiment, the LED board 3 in which a large number of LEDs 2 are arranged in a straight line similar to the conventional example is adopted for the inner two bodies among the plurality of LED boards. About 2 bodies, LED board 3D of the shape curved on the plane is employ | adopted, and these are arrange | positioned on the unit baseplate 1 as shown in FIG. That is, the outer two curved LED substrates 3D are arranged in such a posture that the curved and convex portions are located closer to the center. Instead of the curved shape as in the LED substrate 3D, it is possible to change only the arrangement of the LEDs 2 into an arcuate arrangement.

これにより、本実施の形態のバックライトユニットでは、多数個のＬＥＤ２の物理的な配列を調整することで、高い輝度が要求されるユニット発光面の中心部では高い輝度に、そうではない周辺部では比較的低い輝度にして、ユニットの発光面に要求される不均等な輝度分布に応じた輝度分布になるように多数個のＬＥＤを発光させることができる。   Thereby, in the backlight unit of the present embodiment, by adjusting the physical arrangement of a large number of LEDs 2, high luminance is required at the central portion of the unit light emitting surface where high luminance is required, and peripheral portions that are not. Then, it is possible to make a large number of LEDs emit light so as to have a relatively low luminance and a luminance distribution according to the uneven luminance distribution required for the light emitting surface of the unit.

尚、本発明では、発光面の輝度分布の要求に応じて、上記の各実施の形態を組み合わせた形態でも実施可能である。例えば、図１の第１の実施の形態と図３の第３の実施の形態あるいは図５の第４の実施の形態とを組み合わせ、５体のＬＥＤ基板３それぞれについて図１の不等ピッチにＬＥＤ２が配列されたものを採用することができる。また、図２の第２の実施の形態と図３の第３の実施の形態あるいは図５の第４の実施の形態とを組み合わせ、５体のＬＥＤ基板３それぞれについて図２の不等電流値を印加するＬＥＤ基板を採用することができる。さらに、図７の第５の実施の形態と図３の第３の実施の形態あるいは図５の第４の実施の形態とを組み合わせ、５体のＬＥＤ基板３それぞれについて図７の基板肉厚が中間部で厚いものを採用することができる。   It should be noted that the present invention can also be implemented in a form in which the above-described embodiments are combined according to the request for the luminance distribution on the light emitting surface. For example, the first embodiment of FIG. 1 is combined with the third embodiment of FIG. 3 or the fourth embodiment of FIG. A device in which the LEDs 2 are arranged can be employed. Further, the second embodiment of FIG. 2 is combined with the third embodiment of FIG. 3 or the fourth embodiment of FIG. 5, and the unequal current values of FIG. It is possible to employ an LED substrate that applies Further, the fifth embodiment of FIG. 7 and the third embodiment of FIG. 3 or the fourth embodiment of FIG. 5 are combined, and the substrate thickness of FIG. A thing thick at an intermediate part can be adopted.

本発明の第１の実施の形態のバックライトユニットの平面図。The top view of the backlight unit of the 1st Embodiment of this invention. 本発明の第２の実施の形態のバックライトユニットの平面図。The top view of the backlight unit of the 2nd Embodiment of this invention. 本発明の第３の実施の形態のバックライトユニットの斜視図。The perspective view of the backlight unit of the 3rd Embodiment of this invention. 本発明の第３の実施の形態のバックライトユニットの断面図。Sectional drawing of the backlight unit of the 3rd Embodiment of this invention. 本発明の第４の実施の形態のバックライトユニットの斜視図。The perspective view of the backlight unit of the 4th Embodiment of this invention. 本発明の第４の実施の形態のバックライトユニットの断面図。Sectional drawing of the backlight unit of the 4th Embodiment of this invention. 本発明の第５の実施の形態のバックライトユニットの断面図。Sectional drawing of the backlight unit of the 5th Embodiment of this invention. 本発明の第６の実施の形態のバックライトユニットの平面図。The top view of the backlight unit of the 6th Embodiment of this invention. 従来のバックライトユニットの斜視図。The perspective view of the conventional backlight unit. 従来のバックライトユニットの平面図。The top view of the conventional backlight unit. 従来のバックライトユニットの断面図。Sectional drawing of the conventional backlight unit.

符号の説明Explanation of symbols

１ フレーム底板
２ ＬＥＤ
３，３Ａ，３Ｂ，３Ｃ，３Ｄ ＬＥＤ基板
４ 光学シート 1 Frame bottom plate 2 LED
3, 3A, 3B, 3C, 3D LED substrate 4 Optical sheet

Claims (3)

多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、
当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの分布密度を、他の場所のＬＥＤの分布密度よりも高い配置にしたことを特徴とするバックライトユニット。 In the backlight unit in which a large number of LEDs are arranged as light sources at the bottom of the unit,
According to the luminance distribution required for the backlight unit, the distribution density of the LEDs that require higher brightness than other locations is arranged higher than the distribution density of the LEDs in other locations. Backlight unit to be used. 多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、
当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの高さを、他の場所のＬＥＤよりも高い配置にしたことを特徴とするバックライトユニット。 In the backlight unit in which a large number of LEDs are arranged as light sources at the bottom of the unit,
According to the luminance distribution required for the backlight unit, the height of the LED in the place requiring higher brightness than the other place is set higher than the LED in the other place. unit. 多数個のＬＥＤを光源としてユニット底部に配置したバックライトユニットにおいて、
当該バックライトユニットとして必要とする輝度分布に応じ、他の場所よりも高い輝度を必要とする場所のＬＥＤの印加電流を、他の場所のＬＥＤの印加電流よりも高くしたことを特徴とするバックライトユニット。

In the backlight unit in which a large number of LEDs are arranged as light sources at the bottom of the unit,
According to the luminance distribution required for the backlight unit, the applied current of the LED in the place requiring higher brightness than the other place is set higher than the applied current of the LED in the other place. Light unit.

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