JPH08286186A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH08286186A JPH08286186A JP7092202A JP9220295A JPH08286186A JP H08286186 A JPH08286186 A JP H08286186A JP 7092202 A JP7092202 A JP 7092202A JP 9220295 A JP9220295 A JP 9220295A JP H08286186 A JPH08286186 A JP H08286186A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- guide plate
- light guide
- display device
- 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.)
- Pending
Links
Landscapes
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置のバック
ライトに適用される。BACKGROUND OF THE INVENTION The present invention is applied to a backlight of a liquid crystal display device.
【０００２】[0002]
【従来の技術】現在ノ−トパソコン用液晶表示装置で
は、主にサイドエッジ方式と呼ばれるバックライトが使
われている。2. Description of the Related Art At present, in a liquid crystal display device for a notebook personal computer, a backlight called a side edge type is mainly used.
【０００３】サイドエッジ方式バックライトは、図２に
示すように透明な樹脂からなる導光板４、導光板の側面
に平行に配置された光源となる冷陰極蛍光管１，冷陰極
蛍光管の周りを覆うリフレクタ２、導光板の下側面に配
置された反射シ−ト３、導光板の３つの側面に貼付た反
射テ−プ６、導光板の上側に配置されたプリズムシ−ト
５から主に構成されている。As shown in FIG. 2, the side-edge type backlight includes a light guide plate 4 made of a transparent resin, a cold cathode fluorescent tube 1 serving as a light source arranged in parallel to a side surface of the light guide plate 1, and surroundings of the cold cathode fluorescent tube. Mainly from the reflector 2 covering the above, the reflection sheet 3 arranged on the lower side surface of the light guide plate, the reflection tapes 6 attached to the three side surfaces of the light guide plate, and the prism sheet 5 arranged on the upper side of the light guide plate. It is configured.
【０００４】冷陰極蛍光管１から発せられた光は直接、
或いはリフレクタの内側で反射して導光板４の側面に入
射する。導光板４の下面４ａには散乱のための処理４ｂ
がしてあるので、導光板に入射してきた光は導光板内部
で全反射をくり返すうち散乱のための処理４ｂにより散
乱され、導光板上面より出射する。導光板上面より出射
した光はプリズムシ−ト５により画面垂直方向に集光さ
れる。The light emitted from the cold cathode fluorescent tube 1 is directly
Alternatively, the light is reflected inside the reflector and enters the side surface of the light guide plate 4. The lower surface 4a of the light guide plate 4 has a treatment 4b for scattering.
Therefore, the light that has entered the light guide plate is scattered by the treatment 4b for scattering while repeating total reflection inside the light guide plate, and is emitted from the upper surface of the light guide plate. The light emitted from the upper surface of the light guide plate is condensed by the prism sheet 5 in the vertical direction of the screen.
【０００５】例えば、特開平６−１８８７９号公報記載
の発明では、導光板の下面を粗面に加工し、上面を平滑
面とした平板を用いた導光板から出射する光の角度分布
から求めた頂角６３°のプリズムシ−トを、プリズム面
を導光板側にして構成されている。For example, in the invention described in Japanese Unexamined Patent Publication No. 6-18879, the lower surface of the light guide plate is processed into a rough surface, and the light distribution is obtained from the angular distribution of light emitted from the light guide plate using a flat plate with the upper surface being a smooth surface. A prism sheet having an apex angle of 63 ° is formed with the prism surface on the light guide plate side.
【０００６】[0006]
【発明が解決しようとする課題】最近はノ−トパソコン
は携帯用として用いることから、バックライトに軽量化
を要求されている。Recently, since the notebook personal computer is used for portable use, it is required to reduce the weight of the backlight.
【０００７】同時に、低消費電力化のため、消費電力当
りのバックライト輝度を向上させる要求も強い。At the same time, there is a strong demand for improving the backlight brightness per power consumption in order to reduce the power consumption.
【０００８】そこで、本発明の目的は、軽量で、かつ、
高効率のバックライトを搭載した液晶表示装置を提供す
ることにある。Therefore, an object of the present invention is to be lightweight and
It is to provide a liquid crystal display device equipped with a highly efficient backlight.
【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
に、本発明による液晶表示装置は、液晶表示素子と該液
晶表示素子を背後から均一に照射するための導光板と、
該導光板の少なくとも一端面に配置した線状光源と、上
記液晶表示素子と上記導光板との間に配置され一方の面
が平滑な面で他方の面が多数の微細なプリズムで構成さ
れたプリズムシ−トとを少なくとも備えた液晶表示装置
であって、上記導光板が楔形で、上記プリズムシ−トの
プリズムを備えた側の面が、上記導光板と向かいあうよ
うに配置してある。In order to achieve the above object, a liquid crystal display device according to the present invention comprises a liquid crystal display element and a light guide plate for uniformly illuminating the liquid crystal display element from behind.
A linear light source disposed on at least one end surface of the light guide plate, and a linear surface arranged between the liquid crystal display element and the light guide plate, one surface being a smooth surface and the other surface being a large number of fine prisms. A liquid crystal display device having at least a prism sheet, wherein the light guide plate is wedge-shaped, and a surface of the prism sheet on which the prism is provided faces the light guide plate.
【００１０】バックライトを軽量化させるためには、導
光板の形状を平板から楔形にすることで解決される。In order to reduce the weight of the backlight, it is possible to solve the problem by changing the shape of the light guide plate from a flat plate to a wedge shape.
【００１１】また、楔形導光板を用いた場合には光の出
射方向が、冷陰極蛍光管に垂直方向の面内において一方
向に偏っているため、公知例で使用していたプリズムシ
ートのプリズム形状では最適でない。そこで、導光板の
出射光の方向に合った形状のプリズムシートを用いるこ
とで、輝度向上を図る。Further, when the wedge-shaped light guide plate is used, the emission direction of light is deviated to one direction in the plane perpendicular to the cold cathode fluorescent tube, and therefore the prism of the prism sheet used in the known example is used. Not optimal in shape. Therefore, the brightness is improved by using a prism sheet having a shape that matches the direction of the light emitted from the light guide plate.
【００１２】特に、液晶表示装置での線状光源に垂直方
向の面内において、上記導光板の単位面積から発する光
の輝度のピ−ク方向の角度θに対し、上記プリズムシ−
トの線状光源に遠い方側の斜面と画面法線方向のなす角
度φ1と、線状光源に近い方側の斜面と画面法線方向の
なす角度φ2の関係が、次の（１）式と（２）式を満た
すと、より効果的である。In particular, in the plane perpendicular to the linear light source in the liquid crystal display device, with respect to the angle θ in the peak direction of the brightness of the light emitted from the unit area of the light guide plate, the prism beam
The relationship between the angle φ 1 formed by the slope on the side farther from the linear light source and the screen normal direction and the angle φ 2 formed by the slope on the side closer to the linear light source and the screen normal direction is It is more effective if equations (2) and (2) are satisfied.
【００１３】[0013]
【数３】 (Equation 3)
【００１４】[0014]
【数４】 [Equation 4]
【００１５】[0015]
【作用】軽量化についての楔形導光板の採用は、導光板
の体積を削減することによる重量低減である。The use of the wedge-shaped light guide plate to reduce the weight is to reduce the weight by reducing the volume of the light guide plate.
【００１６】また、楔形導光板の光の出射角度分布に合
ったプリズムシートを使用することは、プリズム形状に
起因する光の損失を極力小さくし、バックライトの輝度
を向上させる効果がある。The use of a prism sheet that matches the light output angle distribution of the wedge-shaped light guide plate has the effect of minimizing the light loss due to the prism shape and improving the brightness of the backlight.
【００１７】[0017]
【実施例】図１に、本発明の液晶表示装置用バックライ
トの一実施例を示す。FIG. 1 shows an embodiment of the backlight for liquid crystal display device of the present invention.
【００１８】図１（ａ）は斜視図、（ｂ）はａ−ａ’断
面の図である。図１において、７は冷陰極蛍光管、８は
リフレクタ、９は反射シート、１０はプリズムシート、
１１は楔形導光板、１２は反射テ−プである。FIG. 1A is a perspective view, and FIG. 1B is a sectional view taken along the line aa '. In FIG. 1, 7 is a cold cathode fluorescent tube, 8 is a reflector, 9 is a reflection sheet, 10 is a prism sheet,
Reference numeral 11 is a wedge-shaped light guide plate, and 12 is a reflection tape.
【００１９】１０のプリズムシートは図４のように上面
が平滑面、導光板側の下面がプリズム面となっている。
本発明で用いたプリズムシートは、平滑面側の屈折率
１．６６のＰＥＴフィルムに、プリズムを形成する屈折
率１．５１のアクリル層を接着させた２層構造となって
いる。As shown in FIG. 4, the prism sheet 10 has a smooth upper surface and a prism surface on the lower surface on the light guide plate side.
The prism sheet used in the present invention has a two-layer structure in which an acrylic layer having a refractive index of 1.51 forming a prism is bonded to a PET film having a refractive index of 1.66 on the smooth surface side.
【００２０】１１の導光板は、アクリル樹脂からなる断
面形状が楔形の透明板で、冷陰極蛍光管側が厚く、反対
側が薄くなっている。また、表面状態は４つの端面は鏡
面で、冷陰極蛍光管と隣接している面以外の３端面には
反射テ−プが貼ってある。大きな２面は粗面にしてあ
り、バックライト面内の輝度を均一の保つため、導光板
面内において粗面の状態は一様ではない。The light guide plate 11 is a transparent plate made of acrylic resin and having a wedge-shaped cross section. The transparent plate is thick on the cold cathode fluorescent tube side and thin on the opposite side. As for the surface state, four end faces are mirror surfaces, and three end faces other than the face adjacent to the cold cathode fluorescent tube are provided with reflection tape. The two large surfaces are rough, and the state of the rough surface is not uniform in the surface of the light guide plate in order to keep the brightness in the backlight surface uniform.
【００２１】図５に、導光板の単位面積から発する光の
輝度のピ−ク方向の角度θと、プリズムシ−トの線状光
源に遠い方側の斜面と画面法線方向のなす角度φ1と、
線状光源に近い方側の斜面と画面法線方向のなす角度φ
2の位置関係を示す。[0021] FIG. 5, the luminance of the peak of the light emitted from a unit area of the light guide plate - and angle click direction theta, Purizumushi - angle of the linear light source to the farther side of the inclined surface and the screen normal direction bets phi 1 When,
Angle φ formed between the slope near the linear light source and the screen normal direction
2 shows the positional relationship.
【００２２】一例として、図３（１）に導光板１１の単
位面積から出射する光の出射角度分布を示す。この分布
では出射光のピークθは２０゜方向となる。この方向の
光を画面垂直方向の９０゜にするためのプリズム最適頂
角は式（１）より、φ2＝５゜とすると、φ1＝３８゜と
なる。図４にその断面形状を示す。図３の出射角度分布
を持つ導光板とφ1＝３８゜、φ2＝５゜の頂角のプリズ
ムシートを組み合わせた結果は図３（２）に示すように
９０゜方向がピークの分布となる。As an example, FIG. 3A shows the emission angle distribution of light emitted from the unit area of the light guide plate 11. In this distribution, the peak θ of the emitted light is in the 20 ° direction. The optimum prism apex angle for making the light in this direction 90 ° in the vertical direction of the screen becomes φ 1 = 38 ° when φ 2 = 5 ° from the equation (1). FIG. 4 shows the cross-sectional shape. As a result of combining the light guide plate having the emission angle distribution of FIG. 3 and the prism sheet having the apex angles of φ 1 = 38 ° and φ 2 = 5 °, the peak distribution is 90 ° as shown in FIG. 3 (2). Become.
【００２３】次に、プリズム形状について説明する。◆
上記と同じθ＝２０°の導光板を用いた場合の、φ2を
変えたときのそれに対応するφ1は、次の（表１）に示
す値となる。Next, the prism shape will be described. ◆
When using the same light guide plate of θ = 20 ° as described above, φ 1 corresponding to that when φ 2 is changed is the value shown in the following (Table 1).
【００２４】[0024]
【表１】 [Table 1]
【００２５】上述の（１）式では、プリズム頂角φ2の
大きさは任意に選択することができるが、図６に示すよ
うに、プリズム形状に起因する光の損失分を極力小さく
するため、φ2はθ＋２０°以下であることが望まし
い。In the above formula (1), the size of the prism apex angle φ 2 can be arbitrarily selected, but as shown in FIG. 6, in order to minimize the light loss due to the prism shape. , Φ 2 is preferably θ + 20 ° or less.
【００２６】また、プリズムピッチ方向の形状は図７
（ａ）のように、三角のプリズム部と平滑部の繰り返し
にすることや、プリズムの山をカットした（ｂ）の構造
とすること、（ｃ）のように形状をウェーブ状にし、接
線の勾配を（１）式および（２）式の角度にすることも
可能である。さらに（ａ），（ｂ），（ｃ）を組み合わ
せた（ｄ），（ｅ）の構造にすることも可能である。The shape in the prism pitch direction is shown in FIG.
As shown in (a), the triangular prism portion and the smooth portion are repeatedly formed, or the prism peaks are cut to form the structure shown in (b). It is also possible to make the gradient the angle of equations (1) and (2). Further, it is also possible to form the structures (d) and (e) by combining (a), (b) and (c).
【００２７】次に、プリズム材質について説明する。◆
上述した例ではＰＥＴとアクリル樹脂の２層構造であっ
たが、例えばポリカーボネート樹脂、ポリエステル樹
脂、ポリズチレン樹脂、フッ素樹脂、ポリイミド樹脂、
塩化ビニル樹脂、これらの樹脂の混合物等の合成樹脂あ
るいは、ガラスや石英などの透明無機材料野単層構造、
及びこれらを組み合わせた多層構造にしてもよい。Next, the prism material will be described. ◆
In the above example, the two-layer structure of PET and acrylic resin was used, but for example, polycarbonate resin, polyester resin, polystyrene resin, fluororesin, polyimide resin,
Vinyl chloride resin, synthetic resin such as a mixture of these resins, or transparent inorganic material single layer structure such as glass or quartz,
Alternatively, a multilayer structure in which these are combined may be used.
【００２８】次に、導光板表面及び裏面形状について説
明する。◆公知例では導光板表面あるいは裏面の少なく
とも一方が粗面か、多数のレンズ単位を形成しておりか
つ、平滑部分が冷陰極蛍光管に近いほど増加するように
設けられている必要があるとしている。しかし、本発明
では例えば導光板の表面または裏面の少なくとも一方の
面を全面粗面にし、粗面の度合いによって出射光を調節
することが可能である。また、表面あるいは裏面の少な
くともどちらか一方を粗面加工、もう一方の面を多数の
プリズムで形成することも可能である。Next, the shapes of the front and back surfaces of the light guide plate will be described. In the publicly known example, at least one of the front surface and the back surface of the light guide plate is a rough surface, or a large number of lens units are formed, and it is necessary that the smooth portion is provided so as to increase toward the cold cathode fluorescent tube. There is. However, in the present invention, for example, at least one of the front surface and the back surface of the light guide plate is roughened over the entire surface, and the emitted light can be adjusted depending on the degree of the roughened surface. It is also possible to roughen at least one of the front surface and the back surface and form the other surface with a large number of prisms.
【００２９】[0029]
【発明の効果】表面を粗面にした楔形導光板と、導光板
からの光の出射角度分布にプリズム頂角を合わせた下面
がプリズム面のプリズムシートを組み合わせることで、
次の効果が得られた。The combination of a wedge-shaped light guide plate having a rough surface and a prism sheet having a prism surface on the lower surface which matches the prism apex angle with the outgoing angle distribution of light from the light guide plate,
The following effects were obtained.
【００３０】まず、導光板重量は従来の平板に比べ、３
３％低減できた。First, the weight of the light guide plate is 3 when compared with the conventional flat plate.
It could be reduced by 3%.
【００３１】また、プリズム頂角を改良することで、光
の利用効率の良いバックライトを実現可能とした。Further, by improving the apex angle of the prism, it is possible to realize a backlight with good light utilization efficiency.
【図１】本発明のバックライト構成を示す図。FIG. 1 is a diagram showing a backlight configuration of the present invention.
【図２】従来のバックライト構造（本文に記載した公知
例の断面図）を示す図。FIG. 2 is a diagram showing a conventional backlight structure (a cross-sectional view of a known example described in the text).
【図３】本発明の導光板出射角分布とプリズムシ−ト上
の出射角分布の説明図。FIG. 3 is an explanatory diagram of an emission angle distribution of a light guide plate and an emission angle distribution on a prism sheet according to the present invention.
【図４】本発明のプリズムシ−ト断面形状の説明図。FIG. 4 is an explanatory diagram of a prism sheet cross-sectional shape of the present invention.
【図５】本発明のプリズムシートの最適化を図った式
（１）及び式（２）中の記号の説明をするための図。FIG. 5 is a diagram for explaining symbols in the expressions (1) and (2) for optimizing the prism sheet of the present invention.
【図６】φ2の大きさによる光の利用効率の違いを説明
するための図。FIG. 6 is a diagram for explaining a difference in light use efficiency depending on the size of φ 2 .
【図７】本発明のプリズムシ−ト断面形状の他の例を示
す図。FIG. 7 is a diagram showing another example of the prism sheet cross-sectional shape of the present invention.
７…冷陰極蛍光管、８…リフレクタ、９…反射シ−ト、
１０…プリズムシ−ト、１１…導光板、１２…反射テ−
プ。7 ... Cold cathode fluorescent tube, 8 ... Reflector, 9 ... Reflective sheet,
10 ... Prism sheet, 11 ... Light guide plate, 12 ... Reflection sheet
Pu.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西山 清一 千葉県茂原市早野3300番地 株式会社日立 製作所電子デバイス事業部内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiichi Nishiyama 3300 Hayano, Mobara-shi, Chiba Hitachi, Ltd. Electronic Device Division
Claims (8)
均一に照射するための導光板と、該導光板の少なくとも
一端面に配置した線状光源と、上記液晶表示素子と上記
導光板との間に配置され一方の面が平滑な面で他方の面
が多数の微細なプリズムで構成されたプリズムシ−トと
を少なくとも備えた液晶表示装置において、上記導光板
が楔形で、上記プリズムシ−トのプリズムを備えた側の
面が、上記導光板と向かいあうように配置してあること
を特徴とした液晶表示装置。1. A liquid crystal display device, a light guide plate for uniformly irradiating the liquid crystal display device from behind, a linear light source arranged on at least one end face of the light guide plate, the liquid crystal display device and the light guide plate. And a prism sheet having at least one smooth surface and the other surface composed of a large number of fine prisms, the light guide plate having a wedge shape, and the prism sheet having a prism shape. 2. The liquid crystal display device, wherein the prism-side surface is arranged so as to face the light guide plate.
リズムシ−トの溝方向が前記線状光源と平行になるよう
に配置したことを特徴とする液晶表示装置。2. The liquid crystal display device according to claim 1, wherein the prism sheet is arranged such that a groove direction thereof is parallel to the linear light source.
に垂直方向の面内において、前記導光板の単位面積から
発する光の輝度のピ−ク方向の角度θに対し、前記プリ
ズムシ−トの線状光源に遠い方側の斜面と画面法線方向
のなす角度φ1と、線状光源に近い方側の斜面と画面法
線方向のなす角度φ2の関係が、次の（１）式と（２）
式を満たすことを特徴とする液晶表示装置。 【数１】 【数２】 3. The liquid crystal display device according to claim 1, wherein, in a plane perpendicular to the linear light source, the luminance of light emitted from a unit area of the light guide plate with respect to an angle .theta. The relationship between the angle φ 1 formed by the slope surface of the prism sheet farther from the linear light source and the screen normal direction and the angle φ 2 formed by the slope surface closer to the linear light source and the screen normal direction are as follows. Formula (1) and (2)
A liquid crystal display device characterized by satisfying a formula. [Equation 1] [Equation 2]
リズムシートの線状光源に近い方側の斜面と画面法線方
向のなす角度φ2が、前記導光板の単位面積から発する
光の輝度のピ−ク方向の角度θ＋20゜以下であることを
特徴とする液晶表示素子。4. The liquid crystal display device according to claim 3, wherein an angle φ 2 formed between a slope of the prism sheet on a side closer to the linear light source and a screen normal direction is a luminance of light emitted from a unit area of the light guide plate. The liquid crystal display element is characterized in that the angle in the peak direction is less than θ + 20 °.
いて、前記導光板の表面または裏面の形状を粗面にした
ことを特徴とする液晶表示装置。5. The liquid crystal display device according to claim 1, 2, 3, or 4, wherein the shape of the front surface or the back surface of the light guide plate is a rough surface.
光板の粗面の状態が面内で一様でないことを特徴とする
液晶表示装置。6. The liquid crystal display device according to claim 5, wherein the state of the rough surface of the light guide plate is not uniform within the surface.
いて、前記導光板が光散乱剤入りであることを特徴とす
る液晶表示装置。7. The liquid crystal display device according to claim 1, 2, 3, or 4, wherein the light guide plate contains a light scattering agent.
ら均一に照射するための導光板と、上記導光板の少なく
とも一端面に配置した線状光源と、上記液晶表示素子と
上記導光板との間に配置され一方の面が平滑な面で他方
の面が多数の微細なプリズムで構成されたプリズムシ−
トとを少なくとも備えた液晶表示装置において、上記導
光板が楔形で、かつ上記プリズムシ−トのプリズムを備
えた側の面が、上記液晶表示素子と向かいあうように配
置してあることを特徴とした液晶表示装置。8. A liquid crystal display device, a light guide plate for uniformly irradiating the liquid crystal display device from behind, a linear light source disposed on at least one end face of the light guide plate, the liquid crystal display device and the light guide plate. A prism sheet having a smooth surface on one side and a large number of fine prisms on the other side.
In the liquid crystal display device including at least the light guide plate, the light guide plate is wedge-shaped, and the surface of the prism sheet on which the prism is provided is arranged so as to face the liquid crystal display element. Liquid crystal display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092202A JPH08286186A (en) | 1995-04-18 | 1995-04-18 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7092202A JPH08286186A (en) | 1995-04-18 | 1995-04-18 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08286186A true JPH08286186A (en) | 1996-11-01 |
Family
ID=14047869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7092202A Pending JPH08286186A (en) | 1995-04-18 | 1995-04-18 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08286186A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998040664A1 (en) * | 1997-03-11 | 1998-09-17 | Enplas Corporation | Surface light source device and asymmetrical prism sheet |
| JP2002042528A (en) * | 2000-04-27 | 2002-02-08 | Kuraray Co Ltd | Surface light-source element and display device using it |
| JP2002124113A (en) * | 2000-07-21 | 2002-04-26 | Hayashi Telempu Co Ltd | Flat lighting device |
| US6661479B2 (en) | 1997-07-31 | 2003-12-09 | Hitachi, Ltd. | Liquid crystal display apparatus |
| EP1726976A1 (en) * | 2005-05-24 | 2006-11-29 | LG Electronics Inc. | Prism sheet and backlight unit including the same |
| KR100907198B1 (en) * | 1997-03-11 | 2009-09-25 | 닛또 쥬시 고교 가부시키가이샤 | Surface light source device and asymmetric prism sheet |
| JP2018159915A (en) * | 2017-03-21 | 2018-10-11 | 恵和株式会社 | Liquid crystal display and turning film for liquid crystal display |
-
1995
- 1995-04-18 JP JP7092202A patent/JPH08286186A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100907198B1 (en) * | 1997-03-11 | 2009-09-25 | 닛또 쥬시 고교 가부시키가이샤 | Surface light source device and asymmetric prism sheet |
| US6222689B1 (en) | 1997-03-11 | 2001-04-24 | Enplas Corporation | Surface light source device and asymmetrical prism sheet |
| WO1998040664A1 (en) * | 1997-03-11 | 1998-09-17 | Enplas Corporation | Surface light source device and asymmetrical prism sheet |
| US6661479B2 (en) | 1997-07-31 | 2003-12-09 | Hitachi, Ltd. | Liquid crystal display apparatus |
| US6727963B1 (en) | 1997-07-31 | 2004-04-27 | Hitachi, Ltd. | Liquid crystal display |
| US6803977B2 (en) | 1997-07-31 | 2004-10-12 | Hitachi, Ltd. | Liquid crystal display apparatus |
| US6958790B2 (en) | 1997-07-31 | 2005-10-25 | Hitachi, Ltd. | Liquid crystal display apparatus |
| JP2002042528A (en) * | 2000-04-27 | 2002-02-08 | Kuraray Co Ltd | Surface light-source element and display device using it |
| JP4566441B2 (en) * | 2000-04-27 | 2010-10-20 | 株式会社クラレ | Surface light source element and display device using the same |
| JP2002124113A (en) * | 2000-07-21 | 2002-04-26 | Hayashi Telempu Co Ltd | Flat lighting device |
| JP2006330672A (en) * | 2005-05-24 | 2006-12-07 | Lg Electronics Inc | Prism sheet and backlight unit using the same |
| EP1726976A1 (en) * | 2005-05-24 | 2006-11-29 | LG Electronics Inc. | Prism sheet and backlight unit including the same |
| JP2018159915A (en) * | 2017-03-21 | 2018-10-11 | 恵和株式会社 | Liquid crystal display and turning film for liquid crystal display |
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