JP2977454B2 - Image quality improvement film for liquid crystal display - Google Patents
Image quality improvement film for liquid crystal displayInfo
- Publication number
- JP2977454B2 JP2977454B2 JP6289686A JP28968694A JP2977454B2 JP 2977454 B2 JP2977454 B2 JP 2977454B2 JP 6289686 A JP6289686 A JP 6289686A JP 28968694 A JP28968694 A JP 28968694A JP 2977454 B2 JP2977454 B2 JP 2977454B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal display
- image quality
- light source
- 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.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶表示装置の画質を改
善する、液晶表示装置用の画質改善フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image quality improving film for a liquid crystal display, which improves the image quality of the liquid crystal display.
【０００２】[0002]
【従来の技術】パーソナルコンピュータや小型ワードプ
ロセッサ等の液晶表示装置を構成する液晶表示素子は、
自家発光性を有しないので、視認性向上の要求を満たす
ため、その背面光源として面状光源装置を用いている。2. Description of the Related Art A liquid crystal display device constituting a liquid crystal display device such as a personal computer or a small word processor is composed of:
Since it does not have a self-luminous property, a planar light source device is used as a back light source to satisfy the demand for improved visibility.
【０００３】面状光源装置は、開発当初には蛍光ランプ
等の光源を液晶表示素子の背面に直接配置した構造（直
下式）をとっていた。これに対し、近年では、液晶表示
装置全体の厚みを薄くして構造の小型化を図るため、面
状光源装置として導光板を用い、その少なくとも一端面
に蛍光ランプを配置したエッジライト方式という構造を
とることが多い。[0003] Initially, the planar light source device had a structure (direct type) in which a light source such as a fluorescent lamp was directly disposed on the back of a liquid crystal display element. On the other hand, in recent years, in order to reduce the thickness of the entire liquid crystal display device and downsize the structure, a light guide plate is used as a planar light source device, and a fluorescent lamp is arranged on at least one end surface of the liquid crystal display device. Often take.
【０００４】図１はエッジライト方式の面状光源装置の
基本構造を示す模式図である。図１において、１は液晶
表示素子、２は面状光源装置である。面状光源装置２に
あっては、直線状光源としての蛍光ランプ３を導光板４
の側傍に設けている。導光板４の裏面にはドット印刷さ
れた塗料（光散乱性インキ）５が設けられ、導光板４の
背面には反射板６が配置され、導光板４の前面には光拡
散シート７が設けられている。FIG. 1 is a schematic view showing a basic structure of an edge light type planar light source device. In FIG. 1, 1 is a liquid crystal display element, and 2 is a planar light source device. In the planar light source device 2, the fluorescent lamp 3 as a linear light source is connected to the light guide plate 4.
It is provided on the side of. A dot printed paint (light scattering ink) 5 is provided on the back surface of the light guide plate 4, a reflection plate 6 is provided on the back surface of the light guide plate 4, and a light diffusion sheet 7 is provided on the front surface of the light guide plate 4. Have been.
【０００５】蛍光ランプ３から発せられた光線は、導光
板４の端面から内部に侵入し、導光板４の裏面の塗料５
によって乱反射され、導光板４の表面から放出される。
塗料５は蛍光ランプ３から導光板４に入射した光を、導
光板４の表面のどの位置からも均等に放出させるための
光散乱性インキの印刷パターンであり、疑似光源とも言
えるものである。しかし、このままでは、液晶表示装置
として必要とされる輝度が十分でなく、また導光板４の
裏面の塗料５の印刷パターンが液晶表示素子１の正面か
ら視認されてしまう。然るに、光拡散シート７は、液晶
表示装置の画面を観察する際に、液晶表示素子１を通し
て背面の疑似光源、即ち上述の塗料５の印刷パターンが
視認されることなしに、均一発光できるように機能する
ものである。Light emitted from the fluorescent lamp 3 enters the inside of the light guide plate 4 from the end face thereof, and paint 5 on the back surface of the light guide plate 4 is formed.
And is emitted from the surface of the light guide plate 4.
The paint 5 is a print pattern of light-scattering ink for uniformly emitting light incident on the light guide plate 4 from the fluorescent lamp 3 from any position on the surface of the light guide plate 4, and can be said to be a pseudo light source. However, in this state, the brightness required for the liquid crystal display device is not sufficient, and the print pattern of the paint 5 on the back surface of the light guide plate 4 is visually recognized from the front of the liquid crystal display element 1. However, the light diffusing sheet 7 can emit light uniformly without observing the pseudo light source on the back surface, that is, the above-described printing pattern of the paint 5 through the liquid crystal display element 1 when observing the screen of the liquid crystal display device. It works.
【０００６】以上のようなエッジライト方式の面状光源
装置において、観察者の方向への光放出量を増加させる
ため、液晶表示素子１と光拡散シート７との間にプリズ
ムシート（集光シート）８を設けることが行なわれてい
る。プリズムシート８は、特開昭62-144102 号公報、特
開平2-93401 号公報、特開平2-257188号公報に記載の如
く、透明なプラスチックシートの片面に凹凸形状を付与
し、その形状のプリズム効果により光線を任意の方向に
集光させるものである。In the edge light type planar light source device as described above, a prism sheet (light collecting sheet) is provided between the liquid crystal display element 1 and the light diffusion sheet 7 in order to increase the amount of light emitted in the direction of the observer. 8) is provided. As described in JP-A-62-144102, JP-A-2-93401, and JP-A-2-257188, the prism sheet 8 is provided with an irregular shape on one surface of a transparent plastic sheet, and the Light is condensed in an arbitrary direction by the prism effect.
【０００７】[0007]
【発明が解決しようとする課題】プリズムシート８は、
観察者の方向への光線放出量を著しく増加させる機能を
有するが、鋭利なプリズム形状を利用しているため、光
放出を観察者の方向へ集中させるほど他の方向への光放
出が減少し、図２に示す如く、光を全く放出しない方向
が存在するようになる。このような光放出特性を有する
面状光源装置を液晶表示装置に搭載した場合、観察者の
相対位置が僅かにでも移動すると、画面内に明るい部分
と極端に暗い部分が同時に存在する状況となり使用に耐
えない状態となる。従って、使用者は、位置関係を可能
な限り変化させずに使用することを余儀なくされ、これ
が使用者の疲労の要因になるという問題がある。The prism sheet 8 is
It has the function of significantly increasing the amount of light emission in the direction of the observer, but because of the sharp prism shape, the more the light emission is concentrated in the direction of the observer, the more the light emission in other directions decreases. As shown in FIG. 2, there is a direction in which no light is emitted. When a planar light source device having such a light emission characteristic is mounted on a liquid crystal display device, even if the relative position of the observer is slightly moved, a bright portion and an extremely dark portion are present on the screen at the same time. It will not be able to withstand. Therefore, the user is forced to use the positional relationship as little as possible, which causes a problem of fatigue of the user.
【０００８】この問題を解決するため、従来から対応さ
れている技術に基づく光拡散部材を液晶表示素子１とプ
リズムシート８の間に配置すると、上述の如くの極端な
光放出方向の集中は回避されるが、主たる観察方向への
光放出量が著しく減少することになる結果、プリズムシ
ート８の本来の集光機能が損なわれ、総合的な画質改善
にならない。In order to solve this problem, if a light diffusing member based on a conventionally supported technique is disposed between the liquid crystal display element 1 and the prism sheet 8, the extreme concentration of the light emitting direction as described above is avoided. However, as a result, the light emission amount in the main observation direction is significantly reduced, so that the original light condensing function of the prism sheet 8 is impaired, and the overall image quality is not improved.
【０００９】本発明は、プリズムシートの光放出状態を
変化させ、明るく、見易く、疲労しない良好な画質感を
有する液晶表示装置を実現することにある。An object of the present invention is to realize a liquid crystal display device which changes the light emission state of a prism sheet, is bright, is easy to see, and has good image quality without fatigue.
【００１０】[0010]
【課題を解決するための手段】請求項１に記載の本発明
は、液晶表示素子の背面に面状光源装置を設けて構成さ
れ、面状光源装置が、導光板と、導光板の側傍に設けた
直線状光源と、導光板の前面に設けた光拡散シートと、
光拡散シートの前面に設けたプリズムシートとを有して
なる液晶表示装置用の画質改善フィルムであって、画質
改善フィルムは、液晶表示素子とプリズムシートとの間
に配置され、無色透明のプラスチックを主成分とし、少
なくとも１種類以上の球状光拡散粒子を含有し、全光線
透過率が80％以上であり、且つ垂直入射光線の拡散半値
角が 5度〜15度であるようにしたものである。According to a first aspect of the present invention, a planar light source device is provided on a back surface of a liquid crystal display element, and the planar light source device includes a light guide plate and a side of the light guide plate. A light source, a light diffusion sheet provided on the front surface of the light guide plate,
An image quality improvement film for a liquid crystal display device having a prism sheet provided on a front surface of a light diffusion sheet, wherein the image quality improvement film is disposed between the liquid crystal display element and the prism sheet, and is a colorless and transparent plastic. Containing at least one kind of spherical light-diffusing particles, having a total light transmittance of 80% or more, and a half-value diffusion angle of normal incident light of 5 ° to 15 °. is there.
【００１１】請求項２に記載の本発明は、請求項１に記
載の本発明において更に、前記球状光拡散粒子が、平均
粒径 1μ〜20μのプラスチック粒子、もしくは、ガラス
粒子であり、フィルムの平均厚みが30μ〜 300μである
ようにしたものである。According to a second aspect of the present invention, in the first aspect of the present invention, the spherical light diffusing particles are plastic particles or glass particles having an average particle size of 1 to 20 μm. The average thickness is 30 μ to 300 μ.
【００１２】[0012]
【作用】前記課題を解決するにあたり、観察者が良好な
画質と感じる光放出状態、並びに従来から用いられてい
る光拡散部材の光拡散能力を検討した結果、観察者
は、角度変化による輝度の急激な低下を不快に感じる。
観察者は、光の放出が全くなく表示が視認できない状
況を不快に感じる。従来の光拡散部材は光をあらゆる
角度方向に均一に拡散させることを目的としている。
従来の光拡散部材はの目的のため光の損失を容認して
いる、との結論を得た。従って、上記、を改善しよ
うとして従来の光拡散部材を追加すると、プリズムシー
トによって集中された光放出範囲を再度拡散光に変換し
てしまうことになり、観察者に到達する光は著しく減少
し、光利用効率そのものも低下することになる。そこで
本発明はプリズムシートの光集中機能を損なうことな
く、画質感を大幅に向上する光学機能フィルムを求めて
検討を加えた結果、特定の範囲の光拡散能力を有するフ
ィルムを用いることによりこれの実現が可能となるこを
見出した。即ち、「無色透明のプラスチックを主成分と
し、少なくとも１種類以上の球状光拡散粒子を含有し、
全光線透過率が80％以上であり、且つ垂直入射光線の拡
散半値角が 5度〜15度である画質改善フィルムを、液晶
表示素子とプリズムシートとの間に配置すること」であ
る。In order to solve the above-mentioned problems, the light emission state that the observer feels to have good image quality and the light diffusion ability of the light diffusion member used conventionally have been examined. I feel the sharp drop is uncomfortable.
The observer feels uncomfortable that there is no light emission and the display cannot be viewed. A conventional light diffusing member aims to uniformly diffuse light in all angular directions.
It has been concluded that conventional light diffusing members allow light loss for the purpose. Therefore, if a conventional light diffusing member is added to improve the above, the light emission range concentrated by the prism sheet will be converted into diffused light again, and the light reaching the observer will be significantly reduced, The light use efficiency itself will also decrease. Therefore, the present invention has been studied in search of an optical functional film that greatly improves the image quality without impairing the light concentrating function of the prism sheet, and as a result, by using a film having a specific range of light diffusion ability, We have found that it can be realized. That is, "a colorless and transparent plastic as a main component, containing at least one or more types of spherical light diffusion particles,
An image quality improving film having a total light transmittance of 80% or more and a diffusion half-value angle of normal incident light of 5 to 15 degrees is disposed between the liquid crystal display element and the prism sheet. "
【００１３】本発明の画質改善フィルムは、その光学特
性として、全光線透過率が80％以上であり、且つ、垂直
入射光線の拡散半値角が 5度〜15度であることが必要で
ある。全光線透過率が80％を下回ると、光線利用効率の
低下を招き、好ましくは90％以上である。また、拡散能
力は、垂直入射光線の拡散半値角が 5度を下回ると、所
望の光線放出状態の変換が行なわれず、画質感の改善効
果がない。15度を上回ると、プリズムシートによる光線
の集中を解消してしまい観察者へ到達する光線が減少し
てしまう。好ましくは 8度〜12度である。この画質改善
フィルムは、プリズムシートと該液晶表示素子との間に
挿入されて使用することにより、本発明の目的を達成す
る。The image quality improving film of the present invention must have, as optical characteristics, a total light transmittance of 80% or more and a diffusion half-value angle of normal incident light of 5 to 15 degrees. When the total light transmittance is less than 80%, the light use efficiency is reduced, and is preferably 90% or more. When the diffusion half-value angle of normal incident light falls below 5 degrees, the desired light emission state is not converted, and there is no effect of improving the image quality. When the angle exceeds 15 degrees, the concentration of light rays by the prism sheet is eliminated, and the number of light rays reaching the observer decreases. Preferably it is 8 to 12 degrees. This image quality improving film achieves the object of the present invention by being used between a prism sheet and the liquid crystal display element.
【００１４】上記光学特性を達成するため、本発明の画
質改善フィルムは、無色透明なプラスチックを主成分と
し、少なくとも１種類以上の球状光拡散粒子を含有す
る。主成分としては、例えば、ポリメチルメタクリレー
ト、ポリカーボネート、ポリビニルクロライド、ポリビ
ニルアルコール、ポリエステル、が使用可能である。ま
た、球状光拡散粒子としては、平均粒径 1μ〜20μのプ
ラスチック粒子、もしくは、ガラス粒子が使用可能であ
る。平均粒径 1μ以下では、粒子の分散が困難であり、
粒子の製造コストが非常に増大する。また、平均粒径20
μ以上では、粒子自体が視認され画質感が向上しない。
好ましくは、 3μ〜10μである。上記組成物を平均厚み
30μ〜 300μのフィルム状に成形し、本発明の画質改善
フィルムを得る。平均厚み 30μ以下では、取扱いが困
難なため折れキズなどによる不良品の発生が増加し、 3
00μ以上では液晶表示モジュールの薄型化の趨勢に逆行
する。好ましくは、50μ〜 150μである。In order to achieve the above-mentioned optical characteristics, the image quality improving film of the present invention comprises a colorless and transparent plastic as a main component and contains at least one kind of spherical light diffusing particles. As the main component, for example, polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyvinyl alcohol, and polyester can be used. Further, as the spherical light diffusing particles, plastic particles or glass particles having an average particle diameter of 1 μm to 20 μm can be used. If the average particle size is 1μ or less, it is difficult to disperse the particles,
The production costs of the particles are greatly increased. In addition, the average particle size 20
Above μ, the particles themselves are visually recognized and the image quality does not improve.
Preferably, it is 3 μm to 10 μm. Average thickness of the above composition
The film is formed into a film having a thickness of 30 μ to 300 μ to obtain the image quality improving film of the present invention. If the average thickness is less than 30μ, it is difficult to handle, and the occurrence of defective products due to breakage etc. will increase.
When the thickness is more than 00 μ, the liquid crystal display module goes against the trend of thinning. Preferably, it is 50 μm to 150 μm.
【００１５】本発明の画質改善フィルムを成形するには
特に手段を選ばないが、溶融流展法、溶液流展法、熱プ
レス法、注型重合法が好適である。The method for forming the image quality improving film of the present invention is not particularly limited, but a melt flow method, a solution flow method, a hot press method and a cast polymerization method are preferred.
【００１６】[0016]
【実施例】液晶表示装置１０を構成する液晶表示素子１
１の背面光源として、図５に示す如くの面状光源装置１
２を構成した。DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display device 1 constituting a liquid crystal display device 10
1 is a planar light source device 1 as shown in FIG.
No. 2 was constructed.
【００１７】面状光源装置１２は、直線状光源としての
蛍光ランプ１３を導光板１４の側傍に設けている。導光
板１４の裏面にはドット印刷された塗料（光散乱性イン
キ）１５が設けられ、導光板１４の背面には反射板１６
が配置され、導光板１４の前面には光拡散シート１７が
設けられ、光拡散シート１７の前面にはプリズムシート
（集光シート）１８が設けられた。更に、面状光源装置
１２にあっては、液晶表示素子１とプリズムシート１８
との間に本発明の画質改善フィルム２１を配置した。The planar light source device 12 has a fluorescent lamp 13 as a linear light source provided beside a light guide plate 14. A paint (light scattering ink) 15 printed with dots is provided on the back surface of the light guide plate 14, and a reflection plate 16 is provided on the back surface of the light guide plate 14.
The light diffusing sheet 17 is provided on the front surface of the light guide plate 14, and the prism sheet (light collecting sheet) 18 is provided on the front surface of the light diffusing sheet 17. Furthermore, in the planar light source device 12, the liquid crystal display element 1 and the prism sheet 18
And the image quality improving film 21 of the present invention was disposed between them.
【００１８】以下、本発明の具体的実施結果を、従来
例、比較例とともに説明する。 （実施例１）（図３） 面状光源装置１２として、導光板１４の厚み4mm 、蛍光
ランプ１３として冷陰極管１本、対角（対角線の長さ）
10.5インチ、光拡散シート１７としてコーティング型光
拡散シート、プリズムシート１８として頂角90度のプリ
ズムシートを備えたカラー液晶表示素子用バックライト
モジュールを用いた。Hereinafter, specific results of the present invention will be described together with a conventional example and a comparative example. (Example 1) (FIG. 3) The planar light source device 12 has a thickness of a light guide plate 14 of 4 mm, the fluorescent lamp 13 has one cold cathode tube, and a diagonal (diagonal length).
A backlight module for a color liquid crystal display device having a 10.5 inch, light diffusion sheet 17 having a coating type light diffusion sheet as a light diffusion sheet 17 and a prism sheet having a vertical angle of 90 degrees as a prism sheet 18 was used.
【００１９】また、画質改善フィルム２１を以下の如く
構成した（図３）。即ち、ポリカーボネート樹脂 100重
量部、平均粒径 7μのアクリル球状粒子 2重量部を予備
混練し、更に溶融流展法により厚さ 100μm のフィルム
状に成形し、実施例１の画質改善フィルム２１とした。
図３において、２１Ａは球状光拡散粒子である。The image quality improving film 21 was constructed as follows (FIG. 3). That is, 100 parts by weight of a polycarbonate resin and 2 parts by weight of acrylic spherical particles having an average particle diameter of 7 μm were preliminarily kneaded, and further formed into a film having a thickness of 100 μm by a melt flow method to obtain an image quality improving film 21 of Example 1. .
In FIG. 3, 21A is a spherical light diffusion particle.
【００２０】この画質改善フィルムの全光線透過率を村
上色彩技術研究所（株）製ヘイズメーターＨＲ−100 に
より測定したところ、92％であった。また、拡散半値角
を（株）ニコン製エリプソメーターＮＰＤＭ−1000によ
り測定したところ10度であった。The total light transmittance of the image quality improving film was measured by a haze meter HR-100 manufactured by Murakami Color Research Laboratory Co., Ltd. and found to be 92%. The half angle of diffusion was 10 degrees when measured with an ellipsometer NPDM-1000 manufactured by Nikon Corporation.
【００２１】（実施例２）（図４） 実施例１の面状光源装置１２において、画質改善フィル
ム２１を以下の如く変更した（図４）。即ち、ポリカー
ボネート樹脂の 100重量部、平均粒径 7μのアクリル球
状粒子 5重量部を予備混練し、更に溶融流展法により厚
さ 100μm のフィルム状に成形し、実施例２の画質改善
フィルム２１とした。図４において、２１Ａ、２１Ｂは
球状光拡散粒子である。Example 2 (FIG. 4) In the surface light source device 12 of Example 1, the image quality improving film 21 was changed as follows (FIG. 4). That is, 100 parts by weight of a polycarbonate resin and 5 parts by weight of acrylic spherical particles having an average particle size of 7 μm were pre-kneaded, and further formed into a film having a thickness of 100 μm by a melt flow method. did. In FIG. 4, 21A and 21B are spherical light diffusion particles.
【００２２】この画質改善フィルムの全光線透過率を村
上色彩技術研究所（株）製ヘイズメーターＨＲ−100 に
より測定したところ、 90％であった。また、拡散半値角
を（株）ニコン製エリプソメーターＮＰＤＭ−1000によ
り測定したところ15度であった。The total light transmittance of this image quality improving film was measured by a haze meter HR-100 manufactured by Murakami Color Research Laboratory Co., Ltd. and found to be 90%. The half value angle of diffusion was 15 degrees when measured with an ellipsometer NPDM-1000 manufactured by Nikon Corporation.
【００２３】（従来例）実施例１の面状光源装置１２か
ら画質改善フィルム２１を取り除き、従来例とした。(Conventional Example) The image quality improving film 21 was removed from the planar light source device 12 of Example 1 to provide a conventional example.
【００２４】（比較例）実施例１の面状光源装置１２か
ら画質改善フィルム２１を取り除き、画質改善フィルム
２１の代わりに従来技術による光線拡散部材を配置し
た。この光線拡散部材はチタンホワイト60重量部を含有
する厚さ 200μのアクリル樹脂製シートであり、全光線
透過率70％、拡散半値角60度であった。(Comparative Example) The image quality improving film 21 was removed from the planar light source device 12 of Example 1, and a light diffusing member according to the prior art was arranged in place of the image quality improving film 21. This light diffusing member was a 200 μm thick acrylic resin sheet containing 60 parts by weight of titanium white, and had a total light transmittance of 70% and a half angle of diffusion of 60 °.
【００２５】以上の実施例１、実施例２、従来例、比較
例について、画面法線方向での明るさ、光線非放出角度
の有無、観察者による画質感の良否の３点を評価し、表
１を得た。With respect to the above Examples 1 and 2, the conventional example, and the comparative example, three points were evaluated: brightness in the normal direction of the screen, the presence or absence of a light non-emission angle, and the quality of the image quality by the observer. Table 1 was obtained.
【表１】 [Table 1]
【００２６】表１の結果より、本発明の画質改善フィル
ム２１によれば、プリズムシートを集光シートとして用
いた面状光源装置の光放出状態を変化させ、明るく、見
易く、疲労しない良好な画質感を有する液晶表示装置を
実現できることが認められる。また、副次的な効果とし
て工程中で傷が付き易いプリズムシートを保護する効果
があり、傷発生による歩留まりを向上させることができ
る。From the results shown in Table 1, according to the image quality improving film 21 of the present invention, the light emission state of the planar light source device using the prism sheet as the light-collecting sheet is changed, and the image quality is bright, easy to see, and good image quality without fatigue. It is recognized that a liquid crystal display device having a feeling can be realized. In addition, as a secondary effect, there is an effect of protecting the prism sheet that is easily damaged during the process, and the yield due to the generation of the scratch can be improved.
【００２７】[0027]
【発明の効果】以上のように本発明によれば、プリズム
シートの光放出状態を変化させ、明るく、見易く、疲労
しない良好な画質感を有する液晶表示装置を実現するこ
とができる。As described above, according to the present invention, it is possible to realize a liquid crystal display device which changes the light emission state of the prism sheet, is bright, is easy to see, and has good image quality without fatigue.
【図１】図１は従来の面状光源装置を示す模式図であ
る。FIG. 1 is a schematic view showing a conventional planar light source device.
【図２】図２は従来の面状光源装置の光線放出特性を示
す模式図である。FIG. 2 is a schematic diagram showing light emission characteristics of a conventional planar light source device.
【図３】図３は本発明の画質改善フィルムの一例を示す
模式図である。FIG. 3 is a schematic view showing an example of the image quality improving film of the present invention.
【図４】図４は本発明の画質改善フィルムの他の例を示
す模式図である。FIG. 4 is a schematic view showing another example of the image quality improving film of the present invention.
【図５】図５は本発明に係る面状光源装置を示す模式図
である。FIG. 5 is a schematic diagram showing a planar light source device according to the present invention.
１０ 液晶表示装置 １１ 液晶表示素子 １２ 面状光源装置 １３ 蛍光ランプ（光源） １４ 導光板 １７ 光拡散シート １８ プリズムシート ２１ 画質改善フィルム ２１Ａ、２１Ｂ 球状光拡散粒子 Reference Signs List 10 liquid crystal display device 11 liquid crystal display element 12 planar light source device 13 fluorescent lamp (light source) 14 light guide plate 17 light diffusion sheet 18 prism sheet 21 image quality improvement film 21A, 21B spherical light diffusion particles
Claims (2)
けて構成され、 面状光源装置が、導光板と、導光板の側傍に設けた直線
状光源と、導光板の前面に設けた光拡散シートと、光拡
散シートの前面に設けたプリズムシートとを有してなる
液晶表示装置用の画質改善フィルムであって、 画質改善フィルムは、液晶表示素子とプリズムシートと
の間に配置され、無色透明のプラスチックを主成分と
し、少なくとも１種類以上の球状光拡散粒子を含有し、 全光線透過率が80％以上であり、且つ垂直入射光線の拡
散半値角が 5度〜15度である、液晶表示装置用の画質改
善フィルム。1. A liquid crystal display device comprising a planar light source device provided on a back surface thereof, the planar light source device comprising a light guide plate, a linear light source provided on a side of the light guide plate, and a front surface of the light guide plate. An image quality improvement film for a liquid crystal display device, comprising: a light diffusion sheet; and a prism sheet provided on a front surface of the light diffusion sheet, wherein the image quality improvement film is disposed between the liquid crystal display element and the prism sheet. It is made of a colorless and transparent plastic as a main component, contains at least one kind of spherical light diffusing particles, has a total light transmittance of 80% or more, and has a half angle of diffusion of normal incident light of 5 to 15 degrees. An image quality improvement film for liquid crystal display devices.
20μのプラスチック粒子、もしくは、ガラス粒子であ
り、フィルムの平均厚みが30μ〜 300μである請求項１
記載の液晶表示装置用の画質改善フィルム。2. The method according to claim 1, wherein the spherical light diffusing particles have an average particle diameter of 1 μm or more.
2. A plastic particle or a glass particle of 20μ, and an average thickness of the film is 30μ to 300μ.
The image quality improving film for a liquid crystal display device according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6289686A JP2977454B2 (en) | 1994-11-24 | 1994-11-24 | Image quality improvement film for liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6289686A JP2977454B2 (en) | 1994-11-24 | 1994-11-24 | Image quality improvement film for liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08146418A JPH08146418A (en) | 1996-06-07 |
| JP2977454B2 true JP2977454B2 (en) | 1999-11-15 |
Family
ID=17746439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6289686A Expired - Fee Related JP2977454B2 (en) | 1994-11-24 | 1994-11-24 | Image quality improvement film for liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2977454B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101327852B1 (en) * | 2007-05-25 | 2013-11-12 | 엘지디스플레이 주식회사 | Backlight unit |
| CN105700263A (en) * | 2016-04-21 | 2016-06-22 | 京东方科技集团股份有限公司 | Image quality improving membrane, preparation method of image quality improving membrane, display panel and display device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862141B2 (en) | 2002-05-20 | 2005-03-01 | General Electric Company | Optical substrate and method of making |
| US7180672B2 (en) | 2002-05-20 | 2007-02-20 | General Electric Company | Optical substrate and method of making |
| US7859759B2 (en) | 2002-05-20 | 2010-12-28 | Sabic Innovative Plastics Ip B.V. | Film, backlight displays, and methods for making the same |
| TWI252938B (en) * | 2002-11-22 | 2006-04-11 | Hon Hai Prec Ind Co Ltd | Light guide plate and backlight system using the same |
| US7072092B2 (en) | 2003-12-31 | 2006-07-04 | General Electric Company | Optical substrate with modulated structure |
| JP2008096904A (en) * | 2006-10-16 | 2008-04-24 | Dainippon Printing Co Ltd | Surface light source device and transmission type display device |
| CN102096233A (en) * | 2009-12-14 | 2011-06-15 | 康佳集团股份有限公司 | Light guide plate for liquid crystal display, backlight module, and liquid crystal display device |
-
1994
- 1994-11-24 JP JP6289686A patent/JP2977454B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101327852B1 (en) * | 2007-05-25 | 2013-11-12 | 엘지디스플레이 주식회사 | Backlight unit |
| CN105700263A (en) * | 2016-04-21 | 2016-06-22 | 京东方科技集团股份有限公司 | Image quality improving membrane, preparation method of image quality improving membrane, display panel and display device |
| CN105700263B (en) * | 2016-04-21 | 2019-08-27 | 京东方科技集团股份有限公司 | A kind of image quality improving film and preparation method thereof, display panel and display device |
| US10571731B2 (en) | 2016-04-21 | 2020-02-25 | Boe Technology Group Co., Ltd. | Image quality improving film and preparation method thereof, display panel and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08146418A (en) | 1996-06-07 |
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