JPH11133426A - Illuminator for small-sized liquid crystal display panel - Google Patents
Illuminator for small-sized liquid crystal display panelInfo
- Publication number
- JPH11133426A JPH11133426A JP9314390A JP31439097A JPH11133426A JP H11133426 A JPH11133426 A JP H11133426A JP 9314390 A JP9314390 A JP 9314390A JP 31439097 A JP31439097 A JP 31439097A JP H11133426 A JPH11133426 A JP H11133426A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- display panel
- crystal display
- light receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 20
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 6
- 239000000057 synthetic resin Substances 0.000 claims abstract description 6
- 238000005286 illumination Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 229920000178 Acrylic resin Polymers 0.000 abstract description 2
- 239000004925 Acrylic resin Substances 0.000 abstract description 2
- 229920000515 polycarbonate Polymers 0.000 abstract description 2
- 239000004417 polycarbonate Substances 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は小型液晶表示パネル
用照明装置に関し、さらに詳しく言えば、光の利用効率
が良好であるとともに、量産化するうえで好適なサイド
ライト型の小型液晶表示パネル用照明装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for a small liquid crystal display panel, and more particularly, to a sidelight type small liquid crystal display panel which has good light use efficiency and is suitable for mass production. The present invention relates to a lighting device.
【０００２】[0002]
【従来の技術】透過型または半透過型液晶表示パネルに
は、その背面にバックライトが設けられる。このバック
ライトには、大別して光拡散板などの下に光源を配置し
た直下型と、導光体の側面に光源を配置したサイドライ
ト型とがあり、図４にはその内のサイドライト型のもの
が模式的に図解されている。2. Description of the Related Art A transmissive or transflective liquid crystal display panel is provided with a backlight on the back. This backlight is roughly classified into a direct light type in which a light source is arranged below a light diffusing plate and the like, and a side light type in which a light source is arranged on a side surface of a light guide. FIG. Are schematically illustrated.
【０００３】すなわち、サイドライト型バックライト
は、図示しない液晶表示パネルとほぼ同じ大きさに形成
された合成樹脂からなる平板状の導光体１を備え、その
一つの側面が受光面１ａとされ、その受光面１ａに対向
して光源２が配置される。That is, the sidelight type backlight includes a flat light guide 1 made of a synthetic resin and formed in substantially the same size as a liquid crystal display panel (not shown), and one side surface thereof serves as a light receiving surface 1a. The light source 2 is arranged to face the light receiving surface 1a.
【０００４】この場合、導光体１の底面１ｅには、光漏
れを少なくするために反射フィルムなどの反射手段（図
示されていない）が設けられ、これにより、光源２から
受光面１ａに入射された光のより多くが、その上面であ
る発光面１ｆから液晶表示パネルに向けて照射されるよ
うにしている。In this case, a reflection means (not shown) such as a reflection film is provided on the bottom surface 1e of the light guide 1 to reduce light leakage, whereby the light from the light source 2 enters the light receiving surface 1a. More of the emitted light is emitted toward the liquid crystal display panel from the light emitting surface 1f, which is the upper surface thereof.
【０００５】[0005]
【発明が解決しようとする課題】このように、サイドラ
イト型バックライトは、導光体１の側方に光源２を配置
する構成であるため、直下型バックライトに比べて薄型
化が可能であり、また、液晶表示パネルに対する光源２
の発熱の影響を少なくし得る点で有利とされている。As described above, since the sidelight type backlight has a configuration in which the light source 2 is arranged on the side of the light guide 1, it can be made thinner than a direct type backlight. Light source 2 for the liquid crystal display panel
This is advantageous in that the influence of heat generation can be reduced.
【０００６】従来、小型液晶表示パネル用照明装置にお
いては、側面からの光漏れは無視されていたが、光利用
効率をさらに向上させるために、受光面１ａを除く各側
面１ｂ〜１ｄに底面１ｅと同様の反射手段として、反射
テープを貼り付けたり、もしくは反射性の印刷を行なお
うとする場合には、以下のような問題があった。Conventionally, in a lighting device for a small liquid crystal display panel, light leakage from a side surface has been neglected. However, in order to further improve light use efficiency, a bottom surface 1e is provided on each of the side surfaces 1b to 1d except for the light receiving surface 1a. In the case where a reflective tape is stuck or reflective printing is performed as the same reflection means as described above, the following problems arise.
【０００７】すなわち、このテープ貼り作業および印刷
作業は、手作業もしくは自動機によることになるが、被
施工面が小さいために、手作業では時間がかかり効率的
でなく、コストアップとなる。また、自動機によるにし
ても、その設備コストが負担になる。さらに、テープ貼
りや印刷に先だって、各側面１ｂ〜１ｄを鏡面仕上げす
る必要があり、これがさらにコストアップの要因となっ
ており、これらの点について改善が望まれていた。That is, the tape attaching operation and the printing operation are performed manually or by an automatic machine. However, since the work surface is small, the manual operation is time-consuming, inefficient, and increases the cost. In addition, even if an automatic machine is used, the equipment cost becomes a burden. In addition, it is necessary to mirror-finish the side surfaces 1b to 1d prior to tape application and printing, which further increases the cost, and improvement in these points has been desired.
【０００８】本発明は、このような課題を解決するため
になされたもので、その目的は、導光体の側面に反射テ
ープ貼りや反射性の印刷を行なうことなく、それとほぼ
同等の光利用効率が得られるようにした小型液晶表示パ
ネル用照明装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a light guide that is substantially equivalent to a light guide without applying a reflective tape or reflective printing on the side surface of the light guide. An object of the present invention is to provide a lighting device for a small liquid crystal display panel, which is capable of obtaining efficiency.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、縦横の長さがともに７〜７０ｍｍであ
り、厚さが０．５〜２．０ｍｍの合成樹脂の板材からな
り、その一つの側面が受光面とされ、一方の平面部が発
光面とされた導光体と、上記受光面に対して光を照射す
る光源とを備え、上記発光面を液晶表示パネルの背面に
対向させて配置される小型液晶表示パネル用照明装置に
おいて、上記導光体の上記受光面の少なくとも反対側の
側面が微細な凹凸からなる梨地粗面とされていることを
特徴としている。In order to achieve the above object, the present invention provides a synthetic resin plate having a length of 7 to 70 mm and a thickness of 0.5 to 2.0 mm. One side surface is a light-receiving surface, and a light guide having one flat surface as a light-emitting surface, and a light source for irradiating the light-receiving surface with light are provided, and the light-emitting surface is provided on the back surface of the liquid crystal display panel. In the illuminating device for a small liquid crystal display panel which is arranged to be opposed, at least a side surface of the light guide opposite to the light receiving surface is a matte rough surface having fine irregularities.
【００１０】これによれば、受光面から入射した光が対
向側面側の梨地粗面にて乱反射するため、側面からの光
漏れを反射テープ貼りや反射性の印刷の場合とほぼ同じ
効率で少なくすることができる。According to this, since the light incident from the light receiving surface is irregularly reflected by the matte rough surface on the opposite side surface, the light leakage from the side surface is reduced with almost the same efficiency as in the case of applying the reflective tape or the reflective printing. can do.
【００１１】この場合、光源としては、寿命および小型
化容易性の面から発光ダイオード（ＬＥＤ）が好ましく
採用される。In this case, a light emitting diode (LED) is preferably used as the light source from the viewpoints of life and ease of miniaturization.
【００１２】この導光体を金型内で射出成形する場合に
は、その側面に対応する金型面を梨地粗面としておけば
よく、従来のような反射テープ貼りや反射性の印刷など
の後加工が不要となる。When the light guide is injection-molded in a mold, the mold surface corresponding to the side surface may be formed as a matte rough surface. No post-processing is required.
【００１３】また、導光体を板材から切り出す場合に
は、その側面を例えばグラインダやサンドブラストなど
の機械的手段で梨地粗面とすればよい。When the light guide is cut out of a plate material, the side surface may be roughened by a mechanical means such as a grinder or sand blast.
【００１４】側面に梨地粗面を形成するにあたって、そ
の凹部と凸部の高さの差Ａが平均で１〜２０μｍ（好ま
しくは２〜１０μｍ）で、隣接する凹部（もしくは凸
部）間のピッチＢが平均で１０〜３００μｍ（好ましく
は２０〜１５０μｍ）であり、かつ、Ｂ／Ａが５〜１０
０（好ましくは１０〜５０μｍ）の範囲とすることによ
り、光漏れをより効果的に防止することができる。In forming a matte rough surface on the side surface, the difference A in height between the concave portion and the convex portion is 1 to 20 μm (preferably 2 to 10 μm) on average, and the pitch between adjacent concave portions (or convex portions) is B is 10 to 300 μm (preferably 20 to 150 μm) on average, and B / A is 5 to 10 μm.
By setting the range to 0 (preferably 10 to 50 μm), light leakage can be more effectively prevented.
【００１５】[0015]
【発明の実施の形態】次に、本発明の技術的思想をより
よく理解するうえで、図面を参照しながら、その実施の
形態について説明する。BEST MODE FOR CARRYING OUT THE INVENTION Next, for better understanding of the technical concept of the present invention, an embodiment will be described with reference to the drawings.
【００１６】図１に示されているように、この実施例と
しての液晶表示パネル用照明装置においても、先に説明
した図４と同様に、図示しない液晶表示パネルとほぼ同
じ大きさに形成された合成樹脂からなる平板状の導光体
１を備え、その一つの側面が受光面１ａとされ、その受
光面１ａに対向して好ましくはＬＥＤなどの点光源２が
配置される。As shown in FIG. 1, the illumination device for a liquid crystal display panel according to this embodiment is formed to have substantially the same size as a liquid crystal display panel (not shown), similarly to FIG. 4 described above. A light guide 1 made of a synthetic resin is provided, one side of which is a light receiving surface 1a, and a point light source 2 such as an LED is preferably arranged opposite the light receiving surface 1a.
【００１７】本発明において、受光面１ａの少なくとも
反対側の側面１ｃは梨地粗面とされ、これによりその側
面１ｃからの光漏れを少なくするようにしている。この
場合、側面１ｃにおける梨地粗面は、次の条件を満たす
ものであることが好ましい。In the present invention, at least the side surface 1c on the opposite side of the light receiving surface 1a is a matte rough surface so that light leakage from the side surface 1c is reduced. In this case, the matte rough surface on the side surface 1c preferably satisfies the following condition.
【００１８】これを図２に基づいて説明する。梨地粗面
の凹部と凸部の高さの差をＡ、隣接する凹部（もしくは
凸部）間のピッチをＢとして、 高さの差Ａが平均で１〜２０μｍ（好ましくは２〜１
０μｍ）の範囲、 ピッチＢが平均で１０〜３００μｍ（好ましくは２０
〜１５０μｍ）の範囲で、かつ、 Ｂ／Ａが５〜１００（好ましくは１０〜５０μｍ）の
範囲。 なお、これらの各範囲は、試行錯誤的に種々実験した結
果、導き出されたものである。This will be described with reference to FIG. The difference in height between the concave and convex portions of the matte rough surface is A, the pitch between adjacent concave portions (or convex portions) is B, and the difference A in height is 1 to 20 μm on average (preferably
0 μm), and the pitch B is 10 to 300 μm on average (preferably 20 μm).
And B / A is in the range of 5 to 100 (preferably 10 to 50 μm). These ranges have been derived as a result of various experiments by trial and error.
【００１９】本発明において、導光体１の材質は特に限
定されないが、透明性および成形性の面からポリカーボ
ネート、アクリル樹脂が好ましく採用可能である。ま
た、導光体１のサイズとしては、大型のものについては
別の解決手段があるので、縦横の長さがともに７〜７０
ｍｍの小型のものが対象となる。その厚みとしては薄す
ぎると、光源からの入射光量が低下し、また、厚すぎる
と重くなるばかりか、光利用効率が低下するので、０．
５〜２．０ｍｍのものが採用される。In the present invention, the material of the light guide 1 is not particularly limited, but polycarbonate and acrylic resin can be preferably used in terms of transparency and moldability. In addition, as for the size of the light guide 1, since there is another solution for a large one, the length of the light guide 1 is 7 to 70.
mm. If the thickness is too small, the amount of incident light from the light source will decrease. If the thickness is too large, not only will it become heavier, but the light use efficiency will decrease.
Those having a size of 5 to 2.0 mm are employed.
【００２０】この導光体１を金型内で射出成形する場合
には、その側面１ｃに対応する金型面を梨地粗面とする
ことにより、導光体１の成形と同時に側面１ｃに梨地粗
面を付与することができる。When the light guide 1 is injection-molded in a mold, the mold surface corresponding to the side surface 1c is made to have a matte rough surface, so that the light guide 1 is formed on the side surface 1c at the same time as molding. A rough surface can be provided.
【００２１】[0021]
【実施例】ここで、本発明の具体的な実施例１を、その
比較例１，２とともに説明する。各例ともに、導光体１
としては、ポリカーボネートを縦３５ｍｍ、横４５ｍ
ｍ、厚み１．１ｍｍの平板とし、その周辺に光源取付部
および液晶表示パネルとの嵌合部を一体的に設けた形で
射出成形したものであり、光源としては一方の短辺側に
２灯型のＬＥＤを２個取り付けたものである（図１参
照）。また、その底面１ｅは配光性付与の表面形状とさ
れており、白色反射フィルムが貼り付けられている。EXAMPLE Here, a specific Example 1 of the present invention will be described together with Comparative Examples 1 and 2. In each case, the light guide 1
As for polycarbonate 35mm in length, 45m in width
m, a flat plate having a thickness of 1.1 mm, which is injection-molded in such a manner that a light source mounting portion and a fitting portion to a liquid crystal display panel are integrally provided around the flat plate. It has two light-type LEDs (see FIG. 1). The bottom surface 1e has a light-distribution-imparting surface shape, and a white reflective film is attached thereto.
【００２２】《実施例１》導光体１の側面１ｃに、凹部
と凸部の高さの差Ａが平均で３μｍ、隣接する凹部（も
しくは凸部）間のピッチＢが平均で６０μｍであり、し
たがってＢ／Ａが２０である梨地粗面を形成した。Embodiment 1 On the side surface 1c of the light guide 1, the difference A between the height of the concave portion and the height of the convex portion is 3 μm on average, and the pitch B between adjacent concave portions (or convex portions) is 60 μm on average. Therefore, a matte rough surface having a B / A of 20 was formed.
【００２３】〈比較例１〉導光体１の各側面１ｂ〜１ｄ
を鏡面仕上げして、そのままの状態とした。<Comparative Example 1> Each side surface 1b to 1d of the light guide 1
Was mirror-finished and left as it is.
【００２４】〈比較例２〉導光体１の側面１ｂ〜１ｄを
鏡面仕上げし、その内の側面１ｃに反射シートを貼り付
けた。<Comparative Example 2> The side surfaces 1b to 1d of the light guide 1 were mirror-finished, and a reflection sheet was attached to the side surface 1c.
【００２５】この実施例１および比較例１，２の各導光
体１に、それらの受光面１ａから光を照射した。そし
て、図３に示されているように、発光面１ｆを仮想的に
ほぼ均等に９分割して、その各分割面の照度を測定し
た。各分割面に記入されている数値は、受光面１ａから
の入射光量を一定とした場合の各分割面で測定された光
量（ｃｄ／ｍ２）である。The light guides 1 of Example 1 and Comparative Examples 1 and 2 were irradiated with light from their light receiving surfaces 1a. Then, as shown in FIG. 3, the light emitting surface 1f was virtually virtually divided into nine, and the illuminance of each of the divided surfaces was measured. The numerical value written on each division surface is the light amount (cd / m 2 ) measured on each division surface when the incident light amount from the light receiving surface 1a is constant.
【００２６】図３（ａ）が実施例１のものであり、各分
割面での発光光量のばらつきを知るうえでの指標とし
て、最小値／最大値の百分率を算出したところ、８４．
２％であった。FIG. 3A shows the first embodiment, and the minimum / maximum percentage was calculated as an index for knowing the variation in the amount of emitted light on each divided surface.
2%.
【００２７】これに対して、図３（ｂ）が比較例１の結
果であり、ばらつき指標は７６．４％であった。また、
図３（ｃ）が比較例２の結果であり、ばらつき指標は８
５．７％であった。On the other hand, FIG. 3B shows the result of Comparative Example 1, and the variation index was 76.4%. Also,
FIG. 3C shows the result of Comparative Example 2, and the variation index is 8
It was 5.7%.
【００２８】このように、本発明によれば、鏡面仕上げ
したままとした比較例１に比べて光利用率が格段と高
く、また、遮光手段を反射シートとした比較例２と比べ
ても光利用率および発光のばらつきについても遜色ない
ことが確認された。As described above, according to the present invention, the light utilization factor is remarkably higher than in Comparative Example 1 in which the mirror surface is finished, and in comparison with Comparative Example 2 in which the light shielding means is a reflection sheet. It was confirmed that there was no inferiority in the variation of the utilization rate and the light emission.
【００２９】なお、上記実施例１としては、受光面１ａ
の反対側の側面１ｃのみを粗面化した場合を説明した
が、他の側面１ｂ，１ｄにも同様の粗面化を行なうこと
もできる。In the first embodiment, the light receiving surface 1a
Although the case where only the side surface 1c on the opposite side is roughened has been described, similar roughening can be performed on the other side surfaces 1b and 1d.
【００３０】[0030]
【発明の効果】以上説明したように、本発明によれば、
サイドライト型の小型バックライトにおいて、導光体の
受光面の少なくとも反対側の側面を微細な凹凸からなる
梨地粗面としたことにより、反射テープや反射性の印刷
の場合とほぼ同様の光利用効率が得られる。したがっ
て、テープ貼り作業や印刷作業およびその前加工として
の鏡面仕上げ工程が不要となり、より一層のコストダウ
ンを図ることができる。As described above, according to the present invention,
In a small sidelight type backlight, at least the side opposite to the light receiving surface of the light guide is made to have a matte rough surface consisting of fine irregularities, so that light utilization is almost the same as in the case of reflective tape or reflective printing Efficiency is obtained. Therefore, a tape attaching operation, a printing operation, and a mirror finishing step as a pre-processing thereof are not required, and the cost can be further reduced.
【図１】本発明の一実施例を模式的に示した斜視図。FIG. 1 is a perspective view schematically showing one embodiment of the present invention.
【図２】上記実施例で形成される梨地粗面の好適な条件
を説明するため、その梨地粗面を誇張して拡大した断面
図。FIG. 2 is a cross-sectional view in which the matte rough surface is exaggerated and enlarged in order to explain preferable conditions of the matte rough surface formed in the embodiment.
【図３】本発明の実施例とその比較例のテスト結果を示
した説明図。FIG. 3 is an explanatory diagram showing test results of an example of the present invention and a comparative example.
【図４】従来のサイドライト型のバックライトの構成を
模式的に示した斜視図。FIG. 4 is a perspective view schematically showing a configuration of a conventional sidelight type backlight.
１ 導光体 １ａ 受光面 １ｂ〜１ｄ 側面 ２ 光源 DESCRIPTION OF SYMBOLS 1 Light guide 1a Light receiving surface 1b-1d Side surface 2 Light source
Claims (3)
り、厚さが０．５〜２．０ｍｍの合成樹脂の板材からな
り、その一つの側面が受光面とされ、一方の平面部が発
光面とされた導光体と、上記受光面に対して光を照射す
る光源とを備え、上記発光面を液晶表示パネルの背面に
対向させて配置される小型液晶表示パネル用照明装置に
おいて、上記導光体の上記受光面の少なくとも反対側の
側面が微細な凹凸からなる梨地粗面とされていることを
特徴とする小型液晶表示パネル用照明装置。1. A synthetic resin plate having a length of 7 mm to 70 mm and a thickness of 0.5 mm to 2.0 mm, one side surface of which is a light receiving surface, and one plane portion is In a lighting device for a small liquid crystal display panel, comprising a light guide serving as a light emitting surface, and a light source for irradiating the light receiving surface with light, wherein the light emitting surface is arranged to face the rear surface of the liquid crystal display panel. A lighting device for a small liquid crystal display panel, wherein at least a side surface of the light guide opposite to the light receiving surface is a matte rough surface having fine irregularities.
特徴とする請求項１に記載の小型液晶表示パネル用照明
装置。2. The illumination device for a small liquid crystal display panel according to claim 1, wherein the light source is a light emitting diode.
が平均で１〜２０μｍで、隣接する凹部（もしくは凸
部）間のピッチＢが平均で１０〜３００μｍであり、か
つ、Ｂ／Ａが５〜１００の範囲であることを特徴とする
請求項１または２に記載の小型液晶表示パネル用照明装
置。3. A difference A in height between a concave portion and a convex portion on the matte rough surface.
The average is 1 to 20 μm, the pitch B between adjacent concave portions (or convex portions) is 10 to 300 μm on average, and the B / A is in the range of 5 to 100. Or the lighting device for a small liquid crystal display panel according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9314390A JPH11133426A (en) | 1997-10-30 | 1997-10-30 | Illuminator for small-sized liquid crystal display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9314390A JPH11133426A (en) | 1997-10-30 | 1997-10-30 | Illuminator for small-sized liquid crystal display panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11133426A true JPH11133426A (en) | 1999-05-21 |
Family
ID=18052778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9314390A Withdrawn JPH11133426A (en) | 1997-10-30 | 1997-10-30 | Illuminator for small-sized liquid crystal display panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11133426A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6825894B2 (en) | 2001-05-30 | 2004-11-30 | Hitachi, Ltd. | Liquid crystal display device |
| US7490962B2 (en) | 2005-12-23 | 2009-02-17 | Coretronic Corporation | Light emitting module and surface light source device |
| CN100465733C (en) * | 2006-01-25 | 2009-03-04 | 中强光电股份有限公司 | light emitting module and surface light source device |
| KR20130104031A (en) * | 2012-03-12 | 2013-09-25 | 삼성디스플레이 주식회사 | Light guide plate and display device having the same |
-
1997
- 1997-10-30 JP JP9314390A patent/JPH11133426A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6825894B2 (en) | 2001-05-30 | 2004-11-30 | Hitachi, Ltd. | Liquid crystal display device |
| US7202920B2 (en) | 2001-05-30 | 2007-04-10 | Hitachi, Ltd. | Liquid crystal display device |
| KR100850400B1 (en) * | 2001-05-30 | 2008-08-04 | 가부시키가이샤 히타치세이사쿠쇼 | Liquid crystal display |
| US7486348B2 (en) | 2001-05-30 | 2009-02-03 | Hitachi, Ltd. | Liquid crystal display device |
| US7714954B2 (en) | 2001-05-30 | 2010-05-11 | Hitachi, Ltd | Liquid crystal display device |
| US7490962B2 (en) | 2005-12-23 | 2009-02-17 | Coretronic Corporation | Light emitting module and surface light source device |
| CN100465733C (en) * | 2006-01-25 | 2009-03-04 | 中强光电股份有限公司 | light emitting module and surface light source device |
| KR20130104031A (en) * | 2012-03-12 | 2013-09-25 | 삼성디스플레이 주식회사 | Light guide plate and display device having the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050104 |