JP4040027B2 - Rear light source device - Google Patents

Rear light source device Download PDF

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JP4040027B2
JP4040027B2 JP2004059047A JP2004059047A JP4040027B2 JP 4040027 B2 JP4040027 B2 JP 4040027B2 JP 2004059047 A JP2004059047 A JP 2004059047A JP 2004059047 A JP2004059047 A JP 2004059047A JP 4040027 B2 JP4040027 B2 JP 4040027B2
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light
light emitting
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light guide
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JP2005250020A (en
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昌彦 小澤
英之 金子
博明 杉浦
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Mitsubishi Electric Corp
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Description

本発明は、液晶表示装置に使用する背面光源装置に関するものである。   The present invention relates to a back light source device used for a liquid crystal display device.

液晶表示装置に使用される背面光源装置において、従来、半導体発光素子を１列に並べて、これらの半導体発光素子から出射される光を導光板で、導光板拡散板へ導光していた。   Conventionally, in a back light source device used for a liquid crystal display device, semiconductor light emitting elements are arranged in a line, and light emitted from these semiconductor light emitting elements is guided to a light guide plate diffusion plate by a light guide plate.

例えば、特許文献１（特許第２９１７８６６号）に開示された背面光源装置では、ＬＥＤが支持体を介して固定されている。このように支持体に埋め込まれたＬＥＤを光源とする場合、支持体は透明な材料を選択し、ＬＥＤが装着された透明な支持体の端面と、導光板の端面とを密着、あるいは接着剤を介して接着することにより面光源が完成される。   For example, in the rear light source device disclosed in Patent Document 1 (Japanese Patent No. 2917866), the LED is fixed via a support. When the LED embedded in the support is used as a light source, a transparent material is selected for the support, and the end surface of the transparent support on which the LED is mounted and the end surface of the light guide plate are in close contact with each other, or an adhesive. The surface light source is completed by adhering via the surface.

特許第２９１７８６６号公報（コラム７、４−５行、１２−１４行）Japanese Patent No. 2917866 (Column 7, lines 4-5, lines 12-14)

上記特許文献１に記載された従来の背面光源装置では、導光板の側面の幅に対向して並べられる半導体発光素子の数が限られているので、導光板へ注入できる光の総量には限界がある。したがって、半導体発光素子を使用する背面光源装置の輝度向上には問題があった。   In the conventional rear light source device described in Patent Document 1, since the number of semiconductor light emitting elements arranged facing the width of the side surface of the light guide plate is limited, the total amount of light that can be injected into the light guide plate is limited. There is. Therefore, there has been a problem in improving the luminance of the back light source device using the semiconductor light emitting element.

また、半導体発光素子が点光源であることに起因する明るさのむらが生じたり、赤、緑及び青の３原色を混合して使用する場合は、各原色光の到達量の差から、色むらが生じる不都合があった。   In addition, when the semiconductor light emitting element is a point light source, brightness unevenness occurs, or when the three primary colors of red, green, and blue are mixed and used, the color unevenness is caused by the difference in the arrival amount of each primary color light. There was an inconvenience that occurred.

本発明は、上述のような課題を解消するためになされたもので、高輝度で、むらの無い背面光源装置を実現しようとするものである。   The present invention has been made to solve the above-described problems, and an object of the present invention is to realize a back light source device having high brightness and no unevenness.

本発明は、半導体発光素子を光源とし、この光源からの出射光を一つの導光拡散板で拡散する背面光源装置において、
複数列の半導体発光素子と、
各々が、前記複数列の半導体発光素子の各列に対応する複数の導光板であり、対応する列の半導体発光素子から出射された光のみを前記導光拡散板へ導く前記複数の導光板とを有し、
前記複数列の半導体発光素子の隣接する２つの列において、第１の列中で隣接する発光素子間に、第２の列中の発光素子が配列されることを特徴とする。
The present invention uses a semiconductor light emitting element as a light source, and in a back light source device that diffuses light emitted from the light source with a single light guide diffusion plate,
A plurality of rows of semiconductor light emitting devices;
Each said a plurality of rows plurality of light guide plates corresponding to each column of the semiconductor light emitting device, and a corresponding plurality of light guide plates only light emitted from the semiconductor light emitting element row leading to the light diffusing plate I have a,
In two adjacent columns of the plurality of columns of semiconductor light emitting elements, the light emitting elements in the second column are arranged between the adjacent light emitting elements in the first column.

本発明は、複数列の半導体発光素子から出射された光を、各々の列に対応する導光板により、1つの導光拡散板へ入射して合成するので、高輝度で、明るさにむらのない背面光源装置が実現できる。   In the present invention, light emitted from a plurality of rows of semiconductor light emitting elements is made incident on one light guide diffusion plate by a light guide plate corresponding to each row, so that it has high brightness and uneven brightness. No back light source device can be realized.

以下、本発明を、実施の形態を示す図面に基づいて具体的に説明する。
実施の形態１．
図１は、本発明の実施の形態１に係わる背面光源装置の側面を示すものである。同図において、各半導体発光素子列１、３中の半導体発光素子は、紙面に垂直な方向に整列している。半導体発光素子列１から出射された光が導光板２へ入射し、更に導光拡散板５で導光及び拡散される。一方、半導体発光素子列３から出射された光は、導光板４で導光され、更に導光拡散板５で導光及び拡散される。導光拡散板５で導光及び拡散された光は、導光拡散板５の表面に対して垂直な方向（図中下向き）へ光が出射される。 Hereinafter, the present invention will be specifically described with reference to the drawings illustrating embodiments.
Embodiment 1 FIG.
FIG. 1 shows a side surface of a back light source device according to Embodiment 1 of the present invention. In the figure, the semiconductor light emitting elements in each of the semiconductor light emitting element arrays 1 and 3 are aligned in a direction perpendicular to the paper surface. Light emitted from the semiconductor light emitting element array 1 enters the light guide plate 2, and is further guided and diffused by the light guide diffusion plate 5. On the other hand, the light emitted from the semiconductor light emitting element array 3 is guided by the light guide plate 4 and further guided and diffused by the light guide diffusion plate 5. The light guided and diffused by the light guide diffusion plate 5 is emitted in a direction perpendicular to the surface of the light guide diffusion plate 5 (downward in the figure).

上記構成により、２列の半導体発光素子から出射された光が、導光拡散板５で混合されることで、光の量が増し、高輝度の背面光源装置が実現される。また、この構成では２列の半導体発光素子としたが、２列以上の半導体発光素子列とこれに対応して２枚以上の導光板にて構成しても、同様の効果が得られる。   With the above configuration, the light emitted from the two rows of semiconductor light emitting elements is mixed by the light guide diffusion plate 5, thereby increasing the amount of light and realizing a high-luminance back light source device. Further, in this configuration, two rows of semiconductor light emitting elements are used, but the same effect can be obtained even if two or more rows of semiconductor light emitting devices and correspondingly two or more light guide plates are used.

実施の形態２．
図２は、本発明の実施の形態２に係わる背面光源装置を示す。実施の形態２では、導光板２に比較して、導光板６は薄い構造となっている。このような構成では、２つの半導体発光素子列１、３から出射される光が、各列に対応する導光板へ入射するが、厚い導光板２では入射量が多く、薄い導光板６では入射量が少なくなる。このため、厚い導光板２に対応する半導体発光素子の発光が少なくても、導光拡散板５への入射光が均一の光となり、明るさにむらの少ない背面光源装置を実現できる。 Embodiment 2. FIG.
FIG. 2 shows a back light source device according to Embodiment 2 of the present invention. In the second embodiment, the light guide plate 6 has a thinner structure than the light guide plate 2. In such a configuration, light emitted from the two semiconductor light emitting element rows 1 and 3 enters the light guide plate corresponding to each row, but the incident amount is large in the thick light guide plate 2 and incident in the thin light guide plate 6. The amount is reduced. For this reason, even if there is little light emission of the semiconductor light emitting element corresponding to the thick light guide plate 2, the incident light to the light guide diffusion plate 5 becomes uniform light, and a back light source device with little unevenness in brightness can be realized.

実施の形態３．
図３は、この発明の実施の形態３に係わる背面光源装置を示す。実施の形態３では、導光板２に比較して導光板７が長い構造となっている。上記構成で、２つの半導体発光素子列から出射される光が、対応する導光板へ入射する。長い方の導光板７では光路長が長く、短い方の導光板２では光路長が短くなる。光路長が長いと、光強度は均一になるが暗くなる。明るい発光をする半導体発光素子列を長い方の導光板の方へ配置することで、導光拡散板への入射光が均一となり、明るさにむらの少ない背面光源装置を実現できる。 Embodiment 3 FIG.
FIG. 3 shows a back light source device according to Embodiment 3 of the present invention. In the third embodiment, the light guide plate 7 is longer than the light guide plate 2. With the above configuration, the light emitted from the two semiconductor light emitting element arrays enters the corresponding light guide plate. The longer light guide plate 7 has a longer optical path length, and the shorter light guide plate 2 has a shorter optical path length. If the optical path length is long, the light intensity becomes uniform but dark. By arranging the semiconductor light emitting element rows that emit bright light toward the longer light guide plate, the incident light to the light guide diffuser plate becomes uniform, and a back light source device with less unevenness in brightness can be realized.

実施の形態４．
図４は、本発明の実施の形態４に係わる背面光源装置を示す。実施の形態４では、導光板２ａに比較して、導光板８は長くて厚いものとなっている。このような構成で、２列の半導体発光素子から出射された光が、各列に対応する導光板へ入射する。長くて厚い方の導光板８では、光路長は長いが入射光量が多く、短くて薄い方の導光板２ａでは光路長が短いが、入射光量が少ない。このため、導光拡散板への入射光が双方で均一の光となり、明るさにむらの少ない背面光源装置を実現できる。 Embodiment 4 FIG.
FIG. 4 shows a back light source device according to Embodiment 4 of the present invention. In Embodiment 4, the light guide plate 8 is longer and thicker than the light guide plate 2a. With such a configuration, light emitted from the two rows of semiconductor light emitting elements is incident on the light guide plate corresponding to each row. The longer and thicker light guide plate 8 has a longer optical path length but a larger amount of incident light, and the shorter and thinner light guide plate 2a has a shorter optical path length but a smaller amount of incident light. For this reason, the light incident on the light guide diffusion plate becomes uniform light on both sides, and a rear light source device with little unevenness in brightness can be realized.

実施の形態５．
図５は、この発明の実施の形態５に係わる背面光源装置を示す。図５によれば、半導体発光素子列１と、半導体発光素子列３は隣り同士の列である。実施の形態５では、隣接する２つの列中の半導体発光素子において、第１の列中で隣接する半導体発光素子の間に、第２の列中の半導体発光素子が配置されている。例えば、半導体発光素子列１中にある半導体発光素子９は、半導体素子列３中にある隣り同士の半導体発光素子１１と１２の間に配置される。また、半導体発光素子列１中にある半導体発光素子１０は、半導体発光素子列３中にある半導体発光素子１２と１３の間にあるように配置される。 Embodiment 5. FIG.
FIG. 5 shows a back light source device according to Embodiment 5 of the present invention. According to FIG. 5, the semiconductor light emitting element row 1 and the semiconductor light emitting element row 3 are adjacent to each other. In the fifth embodiment, in the semiconductor light emitting elements in the two adjacent columns, the semiconductor light emitting elements in the second column are arranged between the semiconductor light emitting elements adjacent in the first column. For example, the semiconductor light emitting element 9 in the semiconductor light emitting element row 1 is disposed between the adjacent semiconductor light emitting elements 11 and 12 in the semiconductor element row 3. Further, the semiconductor light emitting element 10 in the semiconductor light emitting element row 1 is arranged so as to be between the semiconductor light emitting elements 12 and 13 in the semiconductor light emitting element row 3.

上記構成では、隣接する２つ列１、３の半導体発光素子から出射された光が、各列に対応する導光板を介して、導光拡散板５へ入力する際、一方の列中の隣接する半導体発光素子から出射される光線の間に、他方の列の半導体発光素子からの光線が位置する。したがって、明るさにむらの少ない背面光源装置を実現できる。   In the above configuration, when the light emitted from the semiconductor light emitting elements in the adjacent two rows 1 and 3 is input to the light guide diffusion plate 5 through the light guide plate corresponding to each row, the adjacent in one row Between the light rays emitted from the semiconductor light emitting elements to be operated, the light rays from the semiconductor light emitting elements in the other row are located. Therefore, a back light source device with little unevenness in brightness can be realized.

実施の形態６．
図６は、この発明の実施の形態６に係わる背面光源装置を示す。実施の形態６では、隣接する２つの発光素子の列が設けられ、列１中の隣接する発光素子は、それぞれ第１の原色の光と第２の原色の光を出射し、列１中で隣接する発光素子の間に配置される列３中の発光素子は、第３の原色の光を出射する。例えば、列１では、緑色１５、赤色１７、青色１９の半導体発光素子が順に並ぶ。列３では、赤色１４、青色１６、緑色１８の半導体発光素子が順に並ぶ。例えば、列１中にある緑色１５は、列３中にある隣り同士の赤色１４と青色１６の間に配置される。また、列１中にある赤色１７は、列３中にある隣り同士の青色１６と緑色１８の間に配置される。これらの複数の異なる原色光が合成されて、全体として白色となるように配列されている。 Embodiment 6 FIG.
FIG. 6 shows a back light source device according to Embodiment 6 of the present invention. In Embodiment 6, two rows of adjacent light emitting elements are provided, and the adjacent light emitting elements in row 1 emit light of the first primary color and light of the second primary color, respectively. The light emitting elements in the row 3 arranged between adjacent light emitting elements emit light of the third primary color. For example, in row 1, semiconductor light emitting elements of green 15, red 17, and blue 19 are arranged in order. In row 3, semiconductor light emitting elements of red 14, blue 16, and green 18 are arranged in order. For example, the green color 15 in the column 1 is arranged between the adjacent red color 14 and blue color 16 in the column 3. Further, the red color 17 in the column 1 is arranged between the adjacent blue color 16 and the green color 18 in the column 3. The plurality of different primary color lights are combined and arranged so as to be white as a whole.

上記構成で、２列の半導体発光素子１、３から出射された各原色光が、各列に対応する導光板へ入射し、更に導光拡散板へ入射されて、全体として白色となるので、色のむらの少ない背面光源を実現できる。   With the above configuration, each primary color light emitted from the two rows of semiconductor light emitting elements 1 and 3 is incident on the light guide plate corresponding to each column, and further incident on the light guide diffuser plate, so that the whole becomes white. A back light source with less color unevenness can be realized.

実施の形態７．
図７は、この発明の実施の形態７に係わる背面光源装置を示す。導光板２、４と導光拡散板５が、重ねられて配置される。導光板２、４の光出力部と、導光拡散板５の光入力部とに、対向するように、反射鏡２０が設けられている。 Embodiment 7 FIG.
FIG. 7 shows a back light source device according to Embodiment 7 of the present invention. The light guide plates 2 and 4 and the light guide diffusion plate 5 are arranged to overlap each other. A reflecting mirror 20 is provided so as to face the light output portions of the light guide plates 2 and 4 and the light input portion of the light guide diffusion plate 5.

半導体発光素子の列１から出射した光は、導光板２を透過し、反射鏡２０により反射されて、導光拡散板５へ入射する。半導体発光素子の列３から出射した光は、導光板４を透過し、反射鏡２０により反射されて、導光拡散板５へ入射する。導光拡散板５へ入射した光は、導光拡散板５にて均一に拡散するので、小型で、明るさにむらの無い背面光源装置を実現できる。   The light emitted from the column 1 of the semiconductor light emitting elements is transmitted through the light guide plate 2, reflected by the reflecting mirror 20, and enters the light guide diffusion plate 5. The light emitted from the column 3 of the semiconductor light emitting elements passes through the light guide plate 4, is reflected by the reflecting mirror 20, and enters the light guide diffusion plate 5. Since the light incident on the light guide diffusion plate 5 is uniformly diffused by the light guide diffusion plate 5, it is possible to realize a back light source device that is small and has no unevenness in brightness.

実施の形態８．
図８は、この発明の実施の形態８に係わる背面光源装置を示す。実施の形態８では、導光拡散板５が、２つの光入力部２２、２３を有し、導光拡散板５を挟むようにして、光入力部２２、２３に対向する反射鏡２１、２０を設ける。反射鏡２０、２１は円柱状の凹面を有する。 Embodiment 8 FIG.
FIG. 8 shows a back light source device according to Embodiment 8 of the present invention. In the eighth embodiment, the light guide diffusing plate 5 includes two light input portions 22 and 23, and the reflecting mirrors 21 and 20 facing the light input portions 22 and 23 are provided so as to sandwich the light guide diffusing plate 5. . The reflecting mirrors 20 and 21 have a cylindrical concave surface.

半導体発光素子の列１Ａから出射した光は、曲面を有する反射フィルム２８により反射されて導光板２４へ入射し、導光板２４を透過し、反射鏡２０により反射されて、光入力部２２へ入射する。半導体発光素子の列３Ａから出射した光は、曲面を有する反射フィルム２９により反射されて導光板２５へ入射し、導光板２５を透過し、反射鏡２０により反射されて、光入力部２２へ入射する。   The light emitted from the row 1A of semiconductor light emitting elements is reflected by the reflective film 28 having a curved surface, enters the light guide plate 24, passes through the light guide plate 24, is reflected by the reflecting mirror 20, and enters the light input unit 22. To do. The light emitted from the row 3A of semiconductor light emitting elements is reflected by the reflecting film 29 having a curved surface, enters the light guide plate 25, passes through the light guide plate 25, is reflected by the reflecting mirror 20, and enters the light input unit 22. To do.

半導体発光素子の列１Ｂから出射した光は、曲面を有する反射フィルム３１により反射されて導光板２７へ入射し、導光板２７を透過し、反射鏡２１により反射されて、光入力部２３へ入射する。半導体発光素子の列３Ｂから出射した光は、曲面を有する反射フィルム３０により反射されて導光板２６へ入射し、導光板２６を透過し、反射鏡２１により反射されて、光入力部２３へ入射する。半導体発光素子の列１Ａ、１Ｂ、３Ａ、３Ｂを、図７に示すように、導光板２４、２５、２６、２７の光入力部に直接対向するように配置してもよい。複数入力部から導光拡散板５に入射した光が均一に拡散するので、小型で、高輝度のむらの無い背面光源装置を実現できる。   The light emitted from the row 1B of the semiconductor light emitting elements is reflected by the reflecting film 31 having a curved surface, enters the light guide plate 27, passes through the light guide plate 27, is reflected by the reflecting mirror 21, and enters the light input unit 23. To do. The light emitted from the row 3B of the semiconductor light emitting elements is reflected by the reflective film 30 having a curved surface, enters the light guide plate 26, passes through the light guide plate 26, is reflected by the reflecting mirror 21, and enters the light input unit 23. To do. The semiconductor light emitting element rows 1A, 1B, 3A, and 3B may be arranged so as to directly face the light input portions of the light guide plates 24, 25, 26, and 27, as shown in FIG. Since the light incident on the light guide diffusion plate 5 from the plurality of input portions is uniformly diffused, a small-sized back light source device with high brightness and no unevenness can be realized.

以上、実施の形態１から８を説明したが、これらの実施の形態を更に組み合わせて背面光源装置を構成することも可能である。   Although Embodiments 1 to 8 have been described above, it is also possible to configure a back light source device by further combining these embodiments.

本発明の実施の形態１を示す側面図である。It is a side view which shows Embodiment 1 of this invention. 本発明の実施の形態２を示す側面図である。It is a side view which shows Embodiment 2 of this invention. 本発明の実施の形態３を示す側面図である。It is a side view which shows Embodiment 3 of this invention. 本発明の実施の形態４を示す側面図である。It is a side view which shows Embodiment 4 of this invention. 本発明の実施の形態５を示す配置図である。It is a layout view showing a fifth embodiment of the present invention. 本発明の実施の形態６を示す配置図である。It is a layout view showing a sixth embodiment of the present invention. 本発明の実施の形態７を示す側面図である。It is a side view which shows Embodiment 7 of this invention. 本発明の実施の形態８を示す斜視図である。It is a perspective view which shows Embodiment 8 of this invention.

符号の説明Explanation of symbols

１、３ 半導体発光素子列、 ２、４、６、７、８ 導光板、 ５ 導光拡散板、 ９、１０、１１、１２、１３、１４ 導体発光素子、 １５、１６、１７、１８、１９ 半導体発光素子、 ２０、２１ 反射鏡、 ２２、２３ 光入力部。






1, 3 Semiconductor light emitting element row, 2, 4, 6, 7, 8 Light guide plate, 5 Light guide diffuser plate, 9, 10, 11, 12, 13, 14 Conductor light emitting element, 15, 16, 17, 18, 19 Semiconductor light emitting element, 20, 21 reflector, 22, 23 Light input part.






Claims (3)

半導体発光素子を光源とし、この光源からの出射光を一つの導光拡散板で拡散する背面光源装置において、
複数列の半導体発光素子と、
各々が、前記複数列の半導体発光素子の各列に対応する複数の導光板であり、対応する列の半導体発光素子から出射された光のみを前記導光拡散板へ導く前記複数の導光板とを有し、
前記複数列の半導体発光素子の隣接する２つの列において、第１の列中で隣接する発光素子間に、第２の列中の発光素子が配列されることを特徴とする背面光源装置。 In a back light source device that uses a semiconductor light emitting element as a light source and diffuses light emitted from the light source with a single light guide diffusion plate,
A plurality of rows of semiconductor light emitting devices;
Each said a plurality of rows plurality of light guide plates corresponding to each column of the semiconductor light emitting device, and a corresponding plurality of light guide plates only light emitted from the semiconductor light emitting element row leading to the light diffusing plate Have
2. A back light source device according to claim 1, wherein in two adjacent rows of the plurality of rows of semiconductor light emitting devices, the light emitting devices in the second row are arranged between the light emitting devices adjacent in the first row. 前記第１の列中の隣接する発光素子は、それぞれ第１の原色の光と第２の原色の光を出射し、第１の列中で隣接する発光素子の間に配置される前記第２の列中の発光素子は、第３の原色の光を出射することを特徴とする請求項１に記載の背面光源装置。   The adjacent light emitting elements in the first row emit light of the first primary color and the light of the second primary color, respectively, and the second light emitting elements arranged between the adjacent light emitting elements in the first row. 2. The back light source device according to claim 1, wherein the light emitting elements in the row emit light of a third primary color. 前記第１の列は、第１の原色の光を出射する第1の発光素子と、第２の原色の光を出射する第２の発光素子と、第３の原色の光を出射する第３の発光素子とがこの順序で整列する複数の素子列を直列接続してなり、前後に隣接する２つの素子列のうち、後の素子列の第1の発光素子が、前の素子列の第３の発光素子に隣接するように構成され、
前記第２の列は、第１の原色の光を出射する第1の発光素子と、第２の原色の光を出射する第２の発光素子と、第３の原色の光を出射する第３の発光素子とがこの順序で整列する複数の素子列を直列接続してなり、前後に隣接する２つの素子列のうち、後の素子列の第1の発光素子が、前の素子列の第３の発光素子に隣接するように構成され、
前記第１の列中の隣接する２つの発光素子の間に位置する前記第２の列中の発光素子は、前記第１の列中の隣接する２つの発光素子が出射する光とは異なる原色の光を出射することを特徴とする請求項１に記載の背面光源装置。 The first row includes a first light emitting element that emits light of a first primary color, a second light emitting element that emits light of a second primary color, and a third light that emits light of a third primary color. A plurality of element rows arranged in this order in series are connected in series, and of the two adjacent element rows, the first light-emitting element in the subsequent element row is the first element row in the previous element row. 3 adjacent to the light emitting element 3
The second row includes a first light emitting element that emits light of a first primary color, a second light emitting element that emits light of a second primary color, and a third light that emits light of a third primary color. A plurality of element rows arranged in this order in series are connected in series, and of the two adjacent element rows, the first light-emitting element in the subsequent element row is the first element row in the previous element row. 3 adjacent to the light emitting element 3
The light emitting elements in the second column located between two adjacent light emitting elements in the first column are different from the light emitted by the two adjacent light emitting elements in the first column. The rear light source device according to claim 1, wherein the rear light source device emits the light of.
JP2004059047A 2004-03-03 2004-03-03 Rear light source device Expired - Fee Related JP4040027B2 (en)

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CN103244846A (en) * 2012-02-03 2013-08-14 中强光电股份有限公司 Light source module
US8998474B2 (en) 2011-01-21 2015-04-07 Mitsubishi Electric Corporation Surface light source device and liquid crystal display apparatus
US9103950B2 (en) 2011-02-15 2015-08-11 Mitsubishi Electric Corporation Surface light source device and liquid crystal display device

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CN101346581B (en) * 2006-04-19 2010-05-19 夏普株式会社 Backlight device and display using it
CN101680633B (en) * 2007-06-06 2011-07-27 夏普株式会社 Backlight unit and liquid crystal display

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US8998474B2 (en) 2011-01-21 2015-04-07 Mitsubishi Electric Corporation Surface light source device and liquid crystal display apparatus
US9103950B2 (en) 2011-02-15 2015-08-11 Mitsubishi Electric Corporation Surface light source device and liquid crystal display device
CN103244846A (en) * 2012-02-03 2013-08-14 中强光电股份有限公司 Light source module
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