JPH06250172A - Back light - Google Patents

Back light

Info

Publication number
JPH06250172A
JPH06250172A JP5032892A JP3289293A JPH06250172A JP H06250172 A JPH06250172 A JP H06250172A JP 5032892 A JP5032892 A JP 5032892A JP 3289293 A JP3289293 A JP 3289293A JP H06250172 A JPH06250172 A JP H06250172A
Authority
JP
Japan
Prior art keywords
light
sheet
lens
guide plate
lenses
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
Application number
JP5032892A
Other languages
Japanese (ja)
Inventor
Keiji Kashima
啓二 鹿島
Naoki Yoshida
直喜 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tosoh Corp
Original Assignee
Tosoh Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tosoh Corp filed Critical Tosoh Corp
Priority to JP5032892A priority Critical patent/JPH06250172A/en
Publication of JPH06250172A publication Critical patent/JPH06250172A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/082—Construction of plunger or mould for making solid articles, e.g. lenses having profiled, patterned or microstructured surfaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/40—Product characteristics
    • C03B2215/41—Profiled surfaces
    • C03B2215/414—Arrays of products, e.g. lenses

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE:To provide the back light which is high in electric power consumption- brightness conversion efficiency and enables the relatively easy control of light directivity by arranging a sheet consisting of a light transparent material having many fine lenses of an a focal system on the light exit surface side of a light transmission plate. CONSTITUTION:The sheet 2 consisting of the light transparent material having the many fine lenses 7 of the a focal system is arranged on the light exit surface side of the light transmission plate 1 of the back light for a panel having the light transmission plate 1 consisting of the light transparent material and a wire-shaped light source 4 in proximity contact with at least one flank of the light transmission plate 1. The material of the lens sheet 2 may be any materials, insofar as these material allow the efficient passage of light and is quart, glass, natural or synthetic resins having light transparentability, etc. The method for formation of the lenses 7 include a method for forming the lenses by die molding using a hot press, casting, chemical treatment and by using a UV curing resin., etc. The many lenses 7 may be formed as well at fine spacings between each other by partial implantation of ions to a flat plate, such as glass substrate.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、透過型又は、半透過型
パネルを背面より照射するパネル用バックライトに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight for a panel which illuminates a transmissive or semi-transmissive panel from the back side.

【０００２】[0002]

【従来の技術】近時、ラップトップ型又は、ブック型の
ワ−ドプロセッサ−やコンピュ−タ等の表示装置とし
て、薄型でしかも見易いバックライト機構を有する液晶
表示装置が用いられている。このようなバックライトに
は、図１に示すように透光性の導光板の一端部に、蛍光
管のような線状光源を併設するエッジライト方式がよく
用いられる。このエッジライト方式の場合、図２に示す
ように、導光板の一方の面に光拡散機能を付与し、その
面のほぼ全面を鏡面反射板又は光拡散反射シ−トで覆
い、通常は、導光板の出光面側を光拡散シ−トで覆うよ
うに配置されたものが多い。2. Description of the Related Art Recently, a liquid crystal display device having a backlight mechanism which is thin and easy to see has been used as a display device for a laptop or book type word processor, a computer or the like. For such a backlight, an edge light system is often used in which a linear light source such as a fluorescent tube is provided at one end of a light-transmitting light guide plate as shown in FIG. In the case of this edge light system, as shown in FIG. 2, one surface of the light guide plate is provided with a light diffusing function, and almost all of the surface is covered with a specular reflection plate or a light diffusing reflection sheet. In many cases, the light guide plate is arranged so as to cover the light emitting surface side thereof with a light diffusion sheet.

【０００３】特に近時、バックライトがバッテ−リ−駆
動されるようになり消費電力−輝度変換効率のより一層
の向上が望まれおり、バックライトの出光面に、複数の
直線状プリズムを有する透光性材料からなるシ−ト
（Ａ）を、プリズムが出光面側（導光板とは反対側）と
なるように配し、バックライトから出光する光に指向性
を付与し出光面の法線方向の輝度を増加させることが提
案されている。Particularly in recent years, the backlight is driven in a battery-like manner, and it is desired to further improve the power consumption-luminance conversion efficiency. The backlight has a plurality of linear prisms on its light emitting surface. The sheet (A) made of a translucent material is arranged so that the prism is on the light emitting surface side (the side opposite to the light guide plate), and directivity is given to the light emitted from the backlight to obtain the light emitting surface method. It has been proposed to increase the brightness in the line direction.

【０００４】しかし、前記した方法はプリズムを持つシ
ートを使用するため、光学的原理からして、出光面に下
ろした法線方向に対して５０度以上の光線は殆ど出ず、
従って比較的良好な光の指向性を得るシート（Ａ）は、
頂角９０度以上のプリズムを持つものであるが、プリズ
ムの頂角が９０度以上になると光学的原理からして、導
光板側からシ−ト（Ａ）に入射した光線の一部がプリズ
ム内で全反射され、再び導光板側に戻されるという問題
があった。導光板側に再び戻された光線は、導光板内及
びその近辺で屈折、反射、吸収を繰り返し、一部は再び
シ−ト（Ａ）に戻されるものの、吸収される光線が多か
った。このような吸収される光線を少なくして光の利用
効率を更に増加させるためには、バックライトを構成す
る各光学部材の反射率、透過率を１００％にすれば良い
が、そのような物質は現在のところ知られていない。However, since the above-mentioned method uses a sheet having a prism, from the optical principle, almost no light rays of 50 degrees or more are emitted with respect to the direction of the normal line lowered to the light exit surface,
Therefore, the sheet (A) that obtains relatively good light directivity is
Although it has a prism with an apex angle of 90 degrees or more, when the apex angle of the prism is 90 degrees or more, a part of the light beam incident on the sheet (A) from the light guide plate side is a prism because of the optical principle. There was a problem that the light was totally reflected inside and returned to the light guide plate side again. The light beam returned to the light guide plate side was repeatedly refracted, reflected and absorbed in and around the light guide plate, and part of the light beam was returned to the sheet (A), but many light beams were absorbed. In order to reduce the absorbed light rays and further increase the light utilization efficiency, the reflectance and the transmittance of each optical member constituting the backlight may be set to 100%. Is currently unknown.

【０００５】従って、導光板から出光する光に指向性を
付与するには、不満足ながら前記したようなシ−ト
（Ａ）が用いられていた。また、シ−ト（Ａ）もそれ自
体の光拡散性が低いため、導光板に施した光拡散機能を
持つエレメントの形状が透視され、これを隠蔽するため
に更に別の光拡散シ−トを必要としていたのが一般的で
あった。Therefore, in order to give directivity to the light emitted from the light guide plate, the above-mentioned sheet (A) has been unsatisfactorily used. Further, since the sheet (A) itself has a low light diffusing property, the shape of the element having a light diffusing function provided on the light guide plate is seen through, and another light diffusing sheet is used to conceal the shape. Was generally needed.

【０００６】[0006]

【発明が解決しようとする課題】本発明の目的は、消費
電力−輝度変換効率が高く、比較的容易に光の指向性が
制御可能なバックライトを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight which has a high power consumption-luminance conversion efficiency and whose light directivity can be controlled relatively easily.

【０００７】[0007]

【課題を解決するための手段】本発明者等は、上述の点
につき種々の検討を行った結果、エッジライト方式のバ
ックライトの出光面側に、微細な間隔で多数のアフォ−
カル系のレンズを有する透光性材料からなるシ−トを配
置することにより、シ−ト（Ａ）のようにプリズム内で
光線が全反射されることなく光の指向性が強くなり、出
光面に降した法線方向近傍に対して、消費電力−輝度変
換効率が高いバックライトとなることを見出し本発明を
完成した。As a result of various studies on the above points, the inventors of the present invention have found that a large number of apertures are arranged at minute intervals on the light emitting surface side of an edge light type backlight.
By arranging a sheet made of a translucent material having a Cull system lens, the directivity of the light is strengthened without totally reflecting the light rays in the prism as in the sheet (A), and the emitted light is emitted. The present invention has been completed by finding that the backlight has a high power consumption-luminance conversion efficiency in the vicinity of the normal direction on the surface.

【０００８】即ち本発明は、透光性材料からなる導光
板、前記導光板の少なくとも一側面端部にこれに近接し
た線状光源を有するパネル用バックライトにおいて、導
光板の出光面側に、アフォ−カル系の微細で多数のレン
ズを有する透光性材料からなるシ−トを配置したことを
特徴とするパネル用バックライトに関するものである。
次に本発明を図面に基づいて更に詳述する。That is, the present invention provides a light guide plate made of a translucent material, and a panel backlight having a linear light source near at least one side surface end portion of the light guide plate. The present invention relates to a backlight for a panel in which a sheet made of a translucent material having a large number of afocal-type fine lenses is arranged.
Next, the present invention will be described in more detail with reference to the drawings.

【０００９】本発明の基本的な構成は、図１、２に示し
たものと同様である。すなわち、一方の面に出光させる
ための光拡散機能を持つ導光板、及び、少なくともその
一端部に光源を持つものである。本発明の一実施態様の
断面図を図３に示した。図中１は導光板で、光を効率よ
く通過させる物質であればよく、石英、ガラス、透光性
の天然又は合成樹脂、例えばアクリル系樹脂等で構成さ
れる。本発明で光拡散機能を持つ部分は例えば次の部分
である。即ち、導光板の光拡散機能を付与した面又は光
拡散機能を導光板中に付与した導光板そのもの、導光板
の出光面側に配置した後述の光拡散シート面などであ
る。The basic structure of the present invention is the same as that shown in FIGS. That is, a light guide plate having a light diffusion function for emitting light to one surface and a light source at least at one end thereof. A cross-sectional view of one embodiment of the present invention is shown in FIG. In FIG. 1, reference numeral 1 denotes a light guide plate, which may be any substance that allows light to efficiently pass therethrough, and is made of quartz, glass, translucent natural or synthetic resin such as acrylic resin. In the present invention, the portion having the light diffusion function is, for example, the following portion. That is, a surface of the light guide plate having a light diffusing function, a light guide plate itself having a light diffusing function in the light guide plate, a light diffusing sheet surface described later arranged on the light emitting surface side of the light guide plate, or the like.

【００１０】導光板の面に光拡散機能を付与する方法
は、光を拡散させる作用がある物質例えばシリカ、硫酸
バリウム、炭酸カルシウム、チタンホワイト、ガラスビ
−ズ、樹脂ビ−ズ、気泡等を含んだ塗料、印刷インキ等
の光拡散性物質をスクリ−ン印刷等の方法で導光板の一
方の広い面上にドット状に印刷する方法、又は導光板の
表面をドット状に粗面化する方法、導光板の表面に小孔
を開けるか小突起を形成する方法などの方法がある。光
拡散機能はバックライトの出光面とは反対側に施しても
良いし、出光面側に施しても良い。導光板の出光面とは
反対側に施した例を図３に示した（図中６は光拡散性物
質を示す）。また、光拡散機能を導光板中に付与する方
法は、光を拡散させる作用がある物質例えばシリカ、硫
酸バリウム、炭酸カルシウム、チタンホワイト、ガラス
ビ−ズ、樹脂ビ−ズ、気泡、などの導光板とは異なる屈
折率を有する物質等を導光板形成時に結果的に含んだ状
態となる方法であれば良く特に限定されない。The method of imparting a light diffusing function to the surface of the light guide plate includes substances having a function of diffusing light, such as silica, barium sulfate, calcium carbonate, titanium white, glass beads, resin beads, and bubbles. A method of printing a light-diffusing substance such as paint or printing ink in a dot shape on one wide surface of the light guide plate by a method such as screen printing, or a method of roughening the surface of the light guide plate in a dot shape. There are methods such as forming small holes or forming small protrusions on the surface of the light guide plate. The light diffusion function may be provided on the side opposite to the light emitting surface of the backlight, or may be provided on the light emitting surface side. An example in which the light guide plate is provided on the side opposite to the light emitting surface is shown in FIG. 3 (6 in the figure indicates a light diffusing substance). In addition, a method of imparting a light diffusing function to the light guide plate is a light guide plate made of a substance having a function of diffusing light, such as silica, barium sulfate, calcium carbonate, titanium white, glass beads, resin beads, and bubbles. There is no particular limitation as long as it is a method in which a substance having a refractive index different from the above is contained as a result when the light guide plate is formed.

【００１１】図中３は光反射シ−トで銀、アルミニウム
などの鏡面の反射シ−トまたはポリエチレンテレフタレ
ート（ＰＥＴ）にＢａＳＯ4、ＴｉＯ2、気泡などで光拡
散性を付与するなどしたシ−トであり、導光板の出光面
とは反対側の面のほぼ全面を覆うように配置する。In the figure, reference numeral 3 denotes a light reflection sheet, which is a reflection sheet of mirror surface such as silver or aluminum or polyethylene terephthalate (PET) which is provided with light diffusion property by BaSO 4 , TiO 2 , bubbles and the like. And is arranged so as to cover almost the entire surface of the light guide plate opposite to the light emitting surface.

【００１２】図中４は線状光源で、好ましい態様として
は、導光板の端部に光が入光するための間隙（スリッ
ト）を有する銀、アルミニウムなどの鏡面の反射シ−ト
またはＰＥＴにＢａＳＯ4、ＴｉＯ2、気泡などで光拡散
性を付与した光拡散反射シ−トで形成された光反射器
（図中５）で、線状光源の光源面とある幅の間隙をもた
せた状態で覆われており、導光板の少なくとも一端面部
に近接してその中心軸が導光板の端面とほぼ平行となる
ように設置される。この線状光源は、蛍光管、タングス
テン白熱管、オプティカルロッド、ＬＥＤを配列した物
等があるが、蛍光管が好ましく、省電力の面から、電極
部を除く均一発光部の長さが近接する導光板の端部の長
さとほぼ等しいことが好ましい。Numeral 4 in the drawing is a linear light source, and in a preferred embodiment, it is a mirror-like reflection sheet such as silver or aluminum or PET having a gap (slit) at the end of the light guide plate for allowing light to enter. A light reflector (5 in the figure) formed of a light diffusive reflection sheet with light diffusivity provided by BaSO 4 , TiO 2 , bubbles, etc., with a gap of a certain width from the light source surface of the linear light source. And is installed near at least one end face of the light guide plate such that its central axis is substantially parallel to the end face of the light guide plate. This linear light source may be a fluorescent tube, a tungsten incandescent tube, an optical rod, an LED array, or the like, but a fluorescent tube is preferable, and from the viewpoint of power saving, the lengths of the uniform light emitting parts except the electrode part are close to each other. It is preferable that the length is substantially equal to the length of the end portion of the light guide plate.

【００１３】図４は、本発明に用いる透光性材料からな
り微細なレンズを多数有するシ−ト（以下レンズシート
と略称する）の一実施態様の斜視図であり、図５は同断
面図である。また、図６は、本発明に用いるレンズシー
トの別の一実施態様（直線状レンズ）の斜視図であり、
図７は同断面図である。図中７はシート面に構成された
レンズ、８はベースフィルムでレンズ材質と同質か異質
で、レンズ材質と屈折率の異なる材質からなる。図８、
９は本発明に用いるレンズシ−トの更に他の実施態様の
断面図である。図８は凹レンズと凸レンズを向かい合わ
せた例、図９は凸レンズを適当な介在物、例えばバイン
ダー（レンズ物質より屈折率が小さい物質が好ましい）
を介して向かい合わせて配列したシートの例である。FIG. 4 is a perspective view of one embodiment of a sheet (hereinafter abbreviated as a lens sheet) having a large number of fine lenses made of a translucent material used in the present invention, and FIG. 5 is a sectional view thereof. Is. FIG. 6 is a perspective view of another embodiment (linear lens) of the lens sheet used in the present invention,
FIG. 7 is a sectional view of the same. In the figure, 7 is a lens formed on the sheet surface, and 8 is a base film made of the same or different material as the lens material and having a different refractive index from the lens material. 8,
9 is a sectional view of still another embodiment of the lens sheet used in the present invention. FIG. 8 shows an example in which a concave lens and a convex lens are opposed to each other, and FIG. 9 shows a convex lens with an appropriate inclusion, for example, a binder (a substance having a smaller refractive index than the lens substance is preferable).
It is an example of a sheet arranged facing each other through.

【００１４】本発明に用いる、同一面に微細な間隔で多
数のレンズを有する透光性材料からなるレンズシ−ト
は、レンズの光学的機能がいわゆるアフォ−カル系であ
ることが必須であり、導光板の出光面側に配置される。
このレンズシ−トの材質は光を効率よく通過させる物質
であればよく、石英、ガラス、透光性の天然又は合成樹
脂、例えばＰＥＴ，ポリカ−ボネイト、アクリル系樹脂
等である。また前記したベースフィルムについても同様
な材質のものが用いられるが、ベースフィルムの両面に
レンズを向かい合わせたアフォーカル系の場合は、レン
ズとベースフィルムの屈折率は異なる材質のものが用い
られる。The lens sheet used in the present invention, which is made of a translucent material and has a large number of lenses arranged at fine intervals on the same surface, must have a so-called afocal optical function. It is arranged on the light emitting surface side of the light guide plate.
The material of the lens sheet may be any substance that allows light to pass through efficiently, and may be quartz, glass, translucent natural or synthetic resin such as PET, polycarbonate, acrylic resin and the like. The same material is used for the above-mentioned base film, but in the case of an afocal system in which lenses are opposed to each other on both sides of the base film, materials having different refractive indexes for the lens and the base film are used.

【００１５】このレンズの形成方法は特に限定されない
が、例えば熱プレスによる金型成型加工、鋳型加工、化
学処理、紫外線硬化樹脂による方法などがある。尚、透
光性材料からなるシ−ト上にこのような方法でレンズを
形成しても良いが、ガラスなどの平板に部分的にイオン
を注入すなどして屈折率に変化を持たせ、光学的に同一
面に微細な間隔で多数のレンズを有する状態にしても良
い。また、あらかじめ形成したレンズをベースフィルム
に合体させても良い。The method for forming this lens is not particularly limited, but examples thereof include a die molding process by hot pressing, a mold process, a chemical treatment, and a method using an ultraviolet curable resin. Although a lens may be formed on a sheet made of a translucent material by such a method, a flat plate such as glass may be partially ion-implanted to change the refractive index. A plurality of lenses may be optically provided on the same surface at minute intervals. Further, a lens formed in advance may be integrated with the base film.

【００１６】前記レンズの形状は特に限定されないが、
光軸に平行に入射した近軸光線が、光軸にほぼ平行に出
射する形状、例えば、凸レンズと凸レンズを向かい合わ
せた形状、凸レンズと凹レンズを向かい合わせた形状な
どがあるが、図１０に示したように導光板側のレンズの
焦点と、向かい合わせたもう一方のレンズの焦点とが実
質的に一致するようないわゆるアフォ−カル系の状態で
あることが必須である。尚、ガラスなどの平板に部分的
にイオンを注入して屈折率に変化を持たせた場合はレン
ズの形状は判別しがたいので、光軸に平行に入射した近
軸光線が、光軸にほぼ平行に出射するかどうかがアフォ
−カル系であるかどうかの判断の基準となる。The shape of the lens is not particularly limited,
There is a shape in which paraxial rays incident parallel to the optical axis are emitted substantially parallel to the optical axis, for example, a shape in which convex lenses and convex lenses face each other, a shape in which convex lenses and concave lenses face each other, etc. It is essential that the so-called afocal system state is such that the focal point of the lens on the light guide plate side and the focal point of the other lens facing each other substantially coincide with each other. It should be noted that when the ions are partially injected into a flat plate such as glass to change the refractive index, it is difficult to determine the shape of the lens, so paraxial rays incident parallel to the optical axis are reflected on the optical axis. Whether or not the light is emitted in parallel is a criterion for determining whether or not the light is an afocal system.

【００１７】レンズシートの同一面のレンズ（の中心）
同士の間隔は特に限定されないが、人間の目で識別でき
ない程度に狭い方が良く、１μｍ〜１０００μｍ、好ま
しくは１μｍ〜５００μｍであるが、本発明が液晶ディ
スプレイに用いられる場合は、液晶の画素のピッチとほ
ぼ等しいかまたは小さい（例えば、液晶の画素のピッチ
が３００μｍの場合はレンズ同士の間隔はほぼ３００μ
ｍ以下）方が良い。Lens (center of) on the same surface of the lens sheet
The interval between them is not particularly limited, but it is preferable that the distance is as narrow as not distinguishable by human eyes, and it is 1 μm to 1000 μm, preferably 1 μm to 500 μm. However, when the present invention is used for a liquid crystal display, the pixel of the liquid crystal The pitch is almost equal to or smaller than the pitch (for example, when the liquid crystal pixel pitch is 300 μm, the distance between the lenses is approximately 300 μm).
m or less) is better.

【００１８】また、レンズシ−トの単位面積当たりに含
まれるレンズの数は、レンズの底面の周辺部分が部分的
にもほぼ接している状態からみてレンズ同士の間隔で決
まる。夫々のレンズの形状は光学的性質の面から製法上
可能な範囲で同一なものが好ましい。レンズの直径は前
記したレンズ同士の間隔である程度規制されるが、光の
指向性をより強化するためには、製法上可能な範囲で前
記レンズの直径は大きい方（前記レンズ同士がほぼ接し
ている状態）が好ましい。The number of lenses included in a unit area of the lens sheet is determined by the distance between the lenses when the peripheral portion of the bottom surface of the lens is partially in contact. The shape of each lens is preferably the same as long as it is possible from the viewpoint of optical properties in the manufacturing method. The diameter of the lens is regulated to some extent by the distance between the lenses described above, but in order to further enhance the directivity of light, the diameter of the lens is larger (the lenses are substantially in contact with each other as far as the manufacturing method allows). The state) is preferable.

【００１９】光源から発射された光は導光板に入射さ
れ、導光板中からは光拡散機能により全反射の条件を外
された光があらゆる角度に出光している。The light emitted from the light source is incident on the light guide plate, and from the light guide plate, the light that has been out of the condition of total reflection due to the light diffusion function is emitted at all angles.

【００２０】導光板の出光面側にアフォ−カル系レンズ
シ−トを配置することが本発明の特徴であるが、用いる
レンズシ−トの各々のレンズの角倍率が実質的に１以下
であることが好ましい。このような構成とすることによ
り、光拡散機能を持つ部分で拡散反射した光線が前記レ
ンズによって、図１１に示したように出光面に降した法
線方向に対して指向性のある光線となる。従って、指向
性の強い光線であり尚かつレンズの作用によつて光拡散
機能を持つものの形状に対する光学的隠蔽効果がある面
状発光の状態が得られる。It is a feature of the present invention that the afocal lens sheet is arranged on the light emitting surface side of the light guide plate, but the angular magnification of each lens of the lens sheet used is substantially 1 or less. Is preferred. With this structure, the light beam diffused and reflected by the portion having the light diffusing function becomes a light beam having directivity with respect to the normal direction falling on the light exit surface as shown in FIG. 11 by the lens. . Therefore, it is possible to obtain a state of planar light emission which is a light beam having a strong directivity and which has an optical concealing effect on the shape of the light having a light diffusing function by the action of the lens.

【００２１】尚、ここで言う角倍率とは、一般にレンズ
設計で用いられる概念で、図１２に示したようにシート
の出光面側で光軸と出射光線とで形成される角度βと、
入光面側で光軸と入射光線とで形成される角度αとの比
（β／α）である。この角倍率を制御する（すなわち本
発明では実質的に１以下とする）ことによって、導光板
からあらゆる角度に出光している光線に指向性を付与す
ることが出来る。また、前記したシ−ト（Ａ）のように
導光板からシ−ト（Ａ）に入光した光線がプリズム内で
全反射されるようなことがないので、効率よく導光板か
らあらゆる角度に出光している光線に指向性を付与し、
かつ、高輝度なバックライトが得られる。さらに、アフ
ォ−カル系レンズに角度（γ）で入射した光線は角度
（γ×β÷α）で出射するので、角倍率を制御すること
によって比較的容易に光線の指向性を制御できる。Incidentally, the angular magnification referred to here is a concept generally used in lens design, and as shown in FIG. 12, the angle β formed by the optical axis and the outgoing light ray on the light outgoing surface side of the sheet,
It is the ratio (β / α) of the angle α formed by the optical axis and the incident light beam on the light incident surface side. By controlling this angular magnification (that is, substantially 1 or less in the present invention), directivity can be imparted to the light rays emitted from the light guide plate at any angle. Further, unlike the sheet (A) described above, the light rays entering the sheet (A) from the light guide plate are not totally reflected in the prism, so that the light beam can be efficiently reflected from the light guide plate at any angle. Gives directivity to the light rays that emerge,
In addition, a high brightness backlight can be obtained. Further, since the light ray incident on the afocal lens at the angle (γ) is emitted at the angle (γ × β ÷ α), the directivity of the light ray can be controlled relatively easily by controlling the angular magnification.

【００２２】液晶ディスプレイは、その表示面に降した
法線方向から視認する角度が大きくなる程コントラスト
が低くなるため、実用上、前記法線方向近傍での輝度が
重視される。更に、ビュ−ファインダ−に至ってはその
表示面に降した法線方向からしか見ないため、実用上前
記法線方向近傍での輝度が重視される。In a liquid crystal display, the contrast becomes lower as the angle viewed from the direction of the normal line descending on the display surface becomes lower. Therefore, the brightness in the vicinity of the direction of the normal line is practically important. Further, since the viewfinder can be seen only from the direction of the normal line descending on the display surface, the brightness in the vicinity of the normal line direction is practically important.

【００２３】本発明の構成とすると光の指向性が現れ
る。即ち、実質的に出光面に降した法線方向でその面よ
り出光した光の輝度を測定した場合、レンズシ−トを配
さない場合に比較して輝度が増加すること、前記出光面
に降ろした法線に対してある角度から同様に測定した輝
度が実質的に法線方向で測定した時の輝度よりその減少
割合が大となること等から、前記した光の指向性が現れ
ていることが判る。With the structure of the present invention, the directivity of light appears. That is, when the brightness of the light emitted from the surface is measured substantially in the direction normal to the light emitting surface, the brightness is increased as compared with the case where no lens sheet is arranged, and the light is dropped onto the light emitting surface. The directivity of the above-mentioned light appears because the luminance measured in the same manner from a certain angle with respect to the normal is substantially smaller than the luminance measured in the normal direction. I understand.

【００２４】本発明の更に好ましい様態を詳述すると、 （１）図６に示したような直線状レンズシ−トを複数枚
用いる場合、互いの直線状が交差（好ましくは直交）す
るように配置すると更に本発明の効果は増大する。
（２）透明シートのレンズが配置されていない微小な平
面の空間に、前述したような光拡散機能が施されている
ことが好ましい。このような状態とすることにより、レ
ンズに入射しなかった光線を拡散し、より均一な面状発
光とすることが出来る。The more preferable mode of the present invention will be described in detail. (1) When a plurality of linear lens sheets as shown in FIG. 6 are used, they are arranged so that their linear shapes intersect (preferably orthogonal). Then, the effect of the present invention is further increased.
(2) It is preferable that the light diffusing function as described above is applied to the space of the minute plane where the lens of the transparent sheet is not arranged. With such a state, light rays that have not entered the lens can be diffused and more uniform planar light emission can be achieved.

【００２５】（３）レンズシートは導光板の出光面側に
直接配置しても良く、また光拡散層、例えば光拡散シー
ト（図２中の２）を介して配置しても良い。導光板の出
光面側に直接配置する場合もレンズ材質よりも屈折率の
小さい層、例えば空気層を介して配置することが好まし
い。(3) The lens sheet may be arranged directly on the light emitting surface side of the light guide plate, or may be arranged via a light diffusion layer, for example, a light diffusion sheet (2 in FIG. 2). Even when it is arranged directly on the light exit surface side of the light guide plate, it is preferably arranged via a layer having a smaller refractive index than the lens material, for example, an air layer.

【００２６】導光板の出光面側に配置する光拡散シート
は、通常は、導光板の出光面側に空気層を介して配され
ており、このシートは光を拡散させる作用がある物質例
えばシリカ、硫酸バリウム、炭酸カルシウム、チタンホ
ワイト、ガラスビ−ズ、樹脂ビ−ズなどをＰＥＴ、ポリ
カ−ボネイト、アクリル、ガラスなどの透光性シ−トに
コ−ティングするなどして得られる。この光拡散シート
は、必要に応じて用いればよく例えば、光の均一性を更
に向上させるときなどである。The light diffusion sheet arranged on the light emitting surface side of the light guide plate is usually arranged on the light emitting surface side of the light guide plate through an air layer, and this sheet is made of a substance having a function of diffusing light such as silica. , Barium sulfate, calcium carbonate, titanium white, glass beads, resin beads, etc. are coated on a light-transmissive sheet such as PET, polycarbonate, acrylic, or glass. This light diffusing sheet may be used as necessary, for example, when further improving the uniformity of light.

【００２７】[0027]

【発明の効果】本発明は、消費電力−輝度変換効率が高
く、比較的容易に光の指向性が制御可能なバックライト
として得られる。INDUSTRIAL APPLICABILITY The present invention has a high power consumption-luminance conversion efficiency and can be obtained as a backlight in which the directivity of light can be controlled relatively easily.

【００２８】[0028]

【実施例】次に比較例及び実施例で本発明を更に詳述す
る。図３に示すような厚さ４．０ｍｍの長方形導光板
（旭化成製、ＡＣ−９９９、材質はポリメチルメタクリ
レート、２１０ｍｍ×１５５ｍｍ）の長手の両端部に、
直径３．８ｍｍの太さの冷陰極蛍光管（ハリソン電機株
式会社製）を配置し、導光板に接する部分に４ｍｍのス
リットを持つ銀フィルムを反射面が光源と対向するよう
に楕円形に配置し、スリットから出光した光が導光板の
端部から導光板に入光するように配置した。一方、導光
板面上に形成する光拡散物質は、チタンホワイトを含む
塗料を、導光板上に仮想される１ｍｍの間隔を持った直
交線の交点（グリッド）上に円形のドットパタ−ンで印
刷したものであり下記の条件で形成した。EXAMPLES Next, the present invention will be described in more detail with reference to Comparative Examples and Examples. As shown in FIG. 3, a rectangular light guide plate (made by Asahi Kasei, AC-999, made of polymethylmethacrylate, 210 mm × 155 mm) having a thickness of 4.0 mm is provided at both longitudinal ends.
A cold cathode fluorescent tube (made by Harrison Electric Co., Ltd.) with a diameter of 3.8 mm is arranged, and a silver film having a slit of 4 mm is arranged in an elliptical shape so that the reflection surface faces the light source in the portion in contact with the light guide plate. Then, the light emitted from the slit is arranged to enter the light guide plate from the end portion of the light guide plate. On the other hand, the light diffusing substance formed on the surface of the light guide plate is printed with a paint containing titanium white in a circular dot pattern on the intersections (grids) of the orthogonal lines with a virtual spacing of 1 mm on the light guide plate. The film was formed under the following conditions.

【００２９】光拡散物質の被覆率が、最小の地点で２６
％、最大の地点（２本の蛍光管の中間部付近）で９０
％、その中間ではこれらの比率を順次増加した値となる
ように印刷した。また、線状光源の軸と平行となる状態
のグリッド上に被覆される光拡散物質の被覆率が、その
平行線上の中央、即ち、線状光源の長手方向の中央から
線状光源に垂直に立てた導光板面上の線から両端に向か
う方向の光拡散物質までの距離に対して、順次大となる
ように、最小の地点で２６％、最大の地点で４０％、そ
の中間ではこれらの比率を順次増加した値となるように
印刷した。The light diffusing substance has a coverage of 26 at the minimum point.
%, 90 at the maximum point (near the middle of the two fluorescent tubes)
%, And in the middle thereof, printing was performed such that these ratios were sequentially increased. Further, the coverage of the light diffusing substance coated on the grid in a state parallel to the axis of the linear light source is the center on the parallel line, that is, from the longitudinal center of the linear light source to the vertical direction to the linear light source. With respect to the distance from the line on the standing light guide plate surface to the light diffusing substance in the direction toward both ends, 26% at the minimum point, 40% at the maximum point, and these in the middle between these, so that the distance gradually increases. Printing was performed such that the ratio was increased in order.

【００３０】導光板の光拡散物質を印刷した面を厚さ
０．１２５ｍｍの光拡散反射シ−ト（ＩＣＩ製メリネッ
クス３２９）で空気層を介して覆った。さらに、導光板
の出光面側に厚さ０．１ｍｍの光拡散シ−ト（辻本電機
製作所Ｄ−２０４）を空気層を介して１枚配置した。The surface of the light guide plate on which the light diffusing material was printed was covered with a 0.125 mm thick light diffusing reflection sheet (Melinex 329 manufactured by ICI) via an air layer. Further, one sheet of 0.1 mm thick light diffusing sheet (Tsujimoto Denki Seisakusho D-204) was arranged on the light emitting surface side of the light guide plate through an air layer.

【００３１】冷陰極管に、インバ−タ（ＴＤＫ製ＣＸＡ
Ｍ−１０Ｌ）より３０ＫＨｚの交番電圧をかけて一定電
流（１本の冷陰極管に対して５ｍＡ、２本では合計１０
ｍＡ）で駆動させたときの面輝度を、輝度計（トプコン
ＢＭ−８）により視野角２度で出光面に降した法線方向
に対して測定したところ１３００ｃｄ／ｍ2であった。
このとき、光の指向性は殆どなかった（比較例１）。The cold cathode tube is provided with an inverter (TDK CXA).
An alternating voltage of 30 KHz is applied from M-10L), and a constant current (5 mA for one cold cathode tube, a total of 10 for two tubes)
The surface luminance when driven with a current (mA) was measured with a luminance meter (Topcon BM-8) at a viewing angle of 2 degrees with respect to the normal direction to the light emitting surface, and it was 1300 cd / m 2 .
At this time, there was almost no directivity of light (Comparative Example 1).

【００３２】前記光拡散シ−トに代えて透明な紫外線硬
化樹脂で厚さ０．１ｍｍのＰＥＴの両面に図４のような
多数の凸レンズを形成したシートで、レンズは、隣り合
ったレンズ中心とレンズ中心との間隔が１４０μｍでレ
ンズ同士がほぼ接する状態で、ＰＥＴを挟んで対向する
互いのレンズの焦点が実質的に一致した角倍率が０．８
のアフォ−カル系であり、それ以外は比較例１と同一の
装置、条件、で操作し、測定した輝度は１５００ｃｄ／
ｍ2であった。このとき、出光面に降した法線方向に対
して光の指向性が観察された（実施例１）。In place of the light diffusing sheet, a sheet made by forming a large number of convex lenses as shown in FIG. 4 on both sides of PET having a thickness of 0.1 mm and made of a transparent UV-curing resin, and the lenses are arranged at the centers of adjacent lenses. When the distance between the lens and the lens center is 140 μm and the lenses are almost in contact with each other, the focal points of the lenses facing each other with the PET in between are substantially equal to each other, and the angular magnification is 0.8.
Of the afocal system of Example 1 and operated under the same conditions and conditions as in Comparative Example 1 except that the measured luminance was 1500 cd /
It was m 2 . At this time, the directivity of the light was observed with respect to the direction normal to the light exit surface (Example 1).

【００３３】前記レンズシ−トに代えて透明な紫外線硬
化樹脂で厚さ０．１ｍｍのＰＥＴの両面に図６のような
多数の直線状凸レンズを形成したシートで、レンズは、
隣り合ったレンズ中心とレンズ中心との間隔が１４０μ
ｍでレンズ同士がほぼ接する状態で、ＰＥＴを挟んで対
向する互いのレンズの焦点が実質的に一致した角倍率が
０．８のアフォ−カル系であり、それ以外は比較例１と
同一の装置、条件、で操作し、測定した輝度は１６００
ｃｄ／ｍ2であった。このとき、出光面に降した法線方
向に対して光の指向性が観察された（実施例２）。In place of the lens sheet, a sheet made by forming a large number of linear convex lenses as shown in FIG. 6 on both sides of PET having a thickness of 0.1 mm with a transparent UV curable resin, the lens is
The distance between adjacent lens centers is 140μ
In a state in which the lenses are substantially in contact with each other at m, the focal points of the lenses facing each other with the PET interposed therebetween are substantially the same, and the afocal system has an angular magnification of 0.8. The brightness measured by the device and conditions was 1600.
It was cd / m 2 . At this time, the directivity of the light was observed with respect to the direction normal to the light exit surface (Example 2).

【００３４】実施例２のレンズシ−トを２枚、互いの直
線状凸レンズが直交するように空気層を介して配置した
以外は比較例１と同一の装置、条件、で操作し、測定し
た輝度は２０００ｃｄ／ｍ2であった。このとき、出光
面に降した法線方向に対して光の指向性が観察された
（実施例３）。Luminance measured by operating with the same apparatus and conditions as in Comparative Example 1 except that two lens sheets of Example 2 were arranged with an air layer so that their linear convex lenses were orthogonal to each other. Was 2000 cd / m 2 . At this time, the directivity of the light was observed with respect to the direction normal to the light exit surface (Example 3).

【図面の簡単な説明】[Brief description of drawings]

【図１】従来のバックライトの斜視図FIG. 1 is a perspective view of a conventional backlight.

【図２】従来のバックライトの断面図FIG. 2 is a sectional view of a conventional backlight.

【図３】本発明の一実施態様の断面図FIG. 3 is a cross-sectional view of one embodiment of the present invention.

【図４】本発明で用いるレンズ面を持つシートの一実施
態様の斜視図FIG. 4 is a perspective view of an embodiment of a sheet having a lens surface used in the present invention.

【図５】本発明で用いるレンズ面を持つシートの一実施
態様の断面図FIG. 5 is a sectional view of an embodiment of a sheet having a lens surface used in the present invention.

【図６】本発明で用いる直線状レンズ面を持つシートの
一実施態様の斜視図FIG. 6 is a perspective view of an embodiment of a sheet having a linear lens surface used in the present invention.

【図７】本発明で用いる直線状レンズ面を持つシートの
一実施態様の断面図FIG. 7 is a cross-sectional view of one embodiment of a sheet having a linear lens surface used in the present invention.

【図８】本発明のレンズ面を持つシートの他の実施態様
の断面図FIG. 8 is a cross-sectional view of another embodiment of the lens-faced sheet of the present invention.

【図９】本発明のレンズ面を持つシートの他の実施態様
の断面図FIG. 9 is a cross-sectional view of another embodiment of the sheet having a lens surface of the present invention.

【図１０】アフォ−カル系を模式的に示す図FIG. 10 is a diagram schematically showing an afocal system.

【図１１】光拡散機能とレンズとの光学的関係を模式的
に示す図FIG. 11 is a diagram schematically showing an optical relationship between a light diffusion function and a lens.

【図１２】角倍率を模式的に示す図FIG. 12 is a diagram schematically showing angular magnification.

【符号の説明】[Explanation of symbols]

１：導光板 ２：光拡散シート ３：鏡面、光拡散反射シ−ト ４：光源 ５：光源の反射カバー ６：光拡散機能を持つ部分 ７：レンズ ８：ベースフィルム ９：レンズ間の介在物 1: Light guide plate 2: Light diffusion sheet 3: Mirror surface, light diffusion reflection sheet 4: Light source 5: Reflection cover of light source 6: Portion having light diffusion function 7: Lens 8: Base film 9: Inclusion between lenses

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成５年６月２日[Submission date] June 2, 1993

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】０００４[Correction target item name] 0004

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【０００４】しかし、前記した方法はプリズムを持つシ
ートを使用するため、光学的原理からして、出光面に下
ろした法線方向に対して５０度以上の光線は殆ど出ず、
従って比較的良好な光の指向性を得るシート（Ａ）は、
頂角９０度以上のプリズムを持つものであるが、プリズ
ムの頂角が９０度以上になると光学的原理からして、導
光板側からシ−ト（Ａ）にある特定の角度で入射した光
線の大部分がプリズム内で全反射され、再び導光板側に
戻されるという問題があった。導光板側に再び戻された
光線は、導光板内及びその近辺で屈折、反射、吸収を繰
り返し、一部は再びシ−ト（Ａ）に戻されるものの、吸
収される光線が多かった。このような吸収される光線を
少なくして光の利用効率を更に増加させるためには、バ
ックライトを構成する各光学部材の反射率、透過率を１
００％にすれば良いが、そのような物質は現在のところ
知られていない。However, since the above-mentioned method uses a sheet having a prism, from the optical principle, almost no light rays of 50 degrees or more are emitted with respect to the direction of the normal line lowered to the light exit surface,
Therefore, the sheet (A) that obtains relatively good light directivity is
It has a prism with an apex angle of 90 degrees or more, but when the apex angle of the prism is 90 degrees or more, a light ray incident from the light guide plate side at a specific angle in the sheet (A) from the optical principle. mostly is totally reflected by the prism, there is a problem that is returned to the light guide plate of the. The light beam returned to the light guide plate side was repeatedly refracted, reflected and absorbed in and around the light guide plate, and part of the light beam was returned to the sheet (A), but many light beams were absorbed. In order to reduce the absorbed light rays and further increase the light utilization efficiency, the reflectance and the transmittance of each optical member constituting the backlight are set to 1
It may be set to 00%, but such a substance is not known at present.

【手続補正２】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】０００７[Correction target item name] 0007

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【０００７】[0007]

【課題を解決するための手段】本発明者等は、上述の点
につき種々の検討を行った結果、エッジライト方式のバ
ックライトの出光面側に、微細な間隔で多数のアフォ−
カル系のレンズを有する透光性材料からなるシ−トを配
置することにより、光の指向性が強くなり、出光面に降
した法線方向近傍に対して、消費電力−輝度変換効率が
高いバックライトとなることを見出し本発明を完成し
た。As a result of various studies on the above points, the inventors of the present invention have found that a large number of apertures are arranged at minute intervals on the light emitting surface side of an edge light type backlight.
By arranging the sheet made of a translucent material having a cull-type lens, the directivity of light is strengthened, and the power consumption-luminance conversion efficiency is high in the vicinity of the direction normal to the light exit surface. The present invention has been completed by finding out that it becomes a backlight.

【手続補正書】[Procedure amendment]

【提出日】平成６年２月１日[Submission date] February 1, 1994

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００２１[Correction target item name] 0021

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００２１】尚、ここで言う角倍率とは、一般にレンズ
設計で用いられる概念で、図１２に示したようにシート
の出光面側で光軸と出射光線とで形成される角度βと、
入光面側で光軸と入射光線とで形成される角度αとの比
（β／α）である。この角倍率を制御する（すなわち本
発明では実質的に１以下とする）ことによって、導光板
からあらゆる角度に出光している光線に指向性を付与す
ることが出来る。また、前記したシ−ト（Ａ）のように
導光板からシ−ト（Ａ）に、ある特定の角度で入光した
光線の大部分がプリズム内で全反射されるようなことが
さほどないので、効率よく導光板からあらゆる角度に出
光している光線に指向性を付与し、かつ、高輝度なバッ
クライトが得られる。さらに、アフォ−カル系レンズに
角度（γ）で入射した光線は角度（γ×β÷α）で出射
するので、角倍率を制御することによって比較的容易に
光線の指向性を制御できる。Incidentally, the angular magnification referred to here is a concept generally used in lens design, and as shown in FIG. 12, the angle β formed by the optical axis and the outgoing light ray on the light outgoing surface side of the sheet,
It is the ratio (β / α) of the angle α formed by the optical axis and the incident light beam on the light incident surface side. By controlling this angular magnification (that is, substantially 1 or less in the present invention), directivity can be imparted to the light rays emitted from the light guide plate at any angle. Further, the above-mentioned sheet - light guide plate mustard as bets (A) - Doo (A), the majority of light rays incident at a specific angle that is as totally reflected in the prism
Since it is not so much, it is possible to efficiently give a directivity to the light rays emitted from the light guide plate at any angle and obtain a high-luminance backlight. Further, since the light ray incident on the afocal lens at the angle (γ) is emitted at the angle (γ × β ÷ α), the directivity of the light ray can be controlled relatively easily by controlling the angular magnification.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】透光性材料からなる導光板、前記導光板の
少なくとも一側面端部にこれに近接した線状光源を有す
るパネル用バックライトにおいて、導光板の出光面側
に、アフォ−カル系の微細で多数のレンズを有する透光
性材料からなるシ−トを配置したことを特徴とするパネ
ル用バックライト。1. A backlight for a panel, comprising a light guide plate made of a translucent material, and a linear light source adjacent to at least one side surface end portion of the light guide plate. A backlight for a panel, characterized in that a sheet made of a translucent material having a large number of fine lenses is arranged. 【請求項２】各々のレンズの角倍率が実質的に１以下で
あるアフォ−カル系のシートを配置した請求項１記載の
パネル用バックライト。2. The backlight for a panel according to claim 1, wherein an afocal type sheet in which the angular magnification of each lens is substantially 1 or less is arranged. 【請求項３】レンズシ−ト面に光拡散機能を付与したシ
−トを用いた請求項１または２記載のパネル用バックラ
イト。3. The backlight for a panel according to claim 1, wherein a sheet having a lens sheet surface provided with a light diffusing function is used. 【請求項４】光拡散シ−トと一体化したレンズシ−トを
用いた請求項１〜３いずれか記載のパネル用バックライ
ト。4. The backlight for a panel according to claim 1, wherein a lens sheet integrated with a light diffusion sheet is used.
JP5032892A 1993-02-23 1993-02-23 Back light Pending JPH06250172A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5032892A JPH06250172A (en) 1993-02-23 1993-02-23 Back light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5032892A JPH06250172A (en) 1993-02-23 1993-02-23 Back light

Publications (1)

Publication Number Publication Date
JPH06250172A true JPH06250172A (en) 1994-09-09

Family

ID=12371544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5032892A Pending JPH06250172A (en) 1993-02-23 1993-02-23 Back light

Country Status (1)

Country Link
JP (1) JPH06250172A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000214313A (en) * 1999-01-22 2000-08-04 Elf Atochem Sa Light diffusion composite panel
JP2007127932A (en) * 2005-11-07 2007-05-24 Dainippon Printing Co Ltd Light control sheet and surface light source device
KR100742242B1 (en) * 2005-03-04 2007-07-25 (주)포스미디어 Backlight unit for lcd
JP2007240965A (en) * 2006-03-09 2007-09-20 Tohoku Univ Three-dimensional display
JP2010176029A (en) * 2009-01-30 2010-08-12 Jiroo Corporate Plan:Kk Optical sheet for liquid crystal display device, and backlight unit using the same
JP2010224068A (en) * 2009-03-20 2010-10-07 Citizen Finetech Miyota Co Ltd Small-sized reflection-type liquid crystal display

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000214313A (en) * 1999-01-22 2000-08-04 Elf Atochem Sa Light diffusion composite panel
KR100742242B1 (en) * 2005-03-04 2007-07-25 (주)포스미디어 Backlight unit for lcd
JP2007127932A (en) * 2005-11-07 2007-05-24 Dainippon Printing Co Ltd Light control sheet and surface light source device
JP2007240965A (en) * 2006-03-09 2007-09-20 Tohoku Univ Three-dimensional display
JP2010176029A (en) * 2009-01-30 2010-08-12 Jiroo Corporate Plan:Kk Optical sheet for liquid crystal display device, and backlight unit using the same
JP2010224068A (en) * 2009-03-20 2010-10-07 Citizen Finetech Miyota Co Ltd Small-sized reflection-type liquid crystal display

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