JPH07318729A - Back light - Google Patents
Back lightInfo
- Publication number
- JPH07318729A JPH07318729A JP6109363A JP10936394A JPH07318729A JP H07318729 A JPH07318729 A JP H07318729A JP 6109363 A JP6109363 A JP 6109363A JP 10936394 A JP10936394 A JP 10936394A JP H07318729 A JPH07318729 A JP H07318729A
- Authority
- JP
- Japan
- Prior art keywords
- light
- sheet
- backlight
- emitting surface
- light emitting
- 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
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【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少なくとも一端
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。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 on at least one end of a light-transmitting light guide plate as shown in FIG.
【０００３】特に近時、バックライトがバッテリー駆動
されるようになり消費電力−輝度変換効率のより一層の
向上が望まれており、特開平５−１１９２１８号や特開
平５−１２７１５９号公報に開示されているように、導
光板の出光面に、図３に示す様な直線状頂稜を持つプリ
ズム、又は図４に示す様な、その断面がなめらかな山型
を持つプリズムが微細な間隔で互いに平行な状態で並列
する透光性材料からなる光拡散シ−トを図５に示す様に
導光板の出光面に配置して、出光面からでる光に指向性
を付与し、出光面からの光線の主ピ−ク（主光線…同図
中８）の向かう方向が出光面の法線方向に実質的に一致
し、かつ、前記光線の指向性がより出光面の法線方向に
強まるようにする方法が提案されている。Particularly in recent years, since the backlight is driven by a battery, further improvement in power consumption-luminance conversion efficiency is desired, and it is disclosed in JP-A-5-119218 and JP-A-5-127159. As shown in FIG. 3, on the light exit surface of the light guide plate, prisms having a linear apex as shown in FIG. 3 or prisms with a smooth cross section as shown in FIG. As shown in FIG. 5, light diffusion sheets made of a translucent material arranged in parallel with each other are arranged on the light exit surface of the light guide plate to give directivity to the light exiting the light exit surface, The direction of the principal peak of the ray of light (the principal ray ... 8 in the figure) substantially coincides with the normal direction of the light emitting surface, and the directivity of the light ray is further strengthened in the normal direction of the light emitting surface. A method of doing so has been proposed.
【０００４】しかし、前記した方法では、導光板の出光
面の法線方向に対する消費電力−輝度変換効率は向上す
るものの、図６に示す様に、あらかじめ設定された特定
の視点（例えば同図中Ｐ）と導光板の出光面の任意の点
とを結ぶ直線と出光面とがなす角度がそれぞれ異なるた
め、特定の視点（図中Ｐ）で観測される輝度が導光板の
出光面の場所によって異なるという問題があった。その
結果、導光板の任意の出光面の微小部分の法線方向に対
する輝度がそれぞれ実質的に等しい状態であっても、実
際にバックライトが使用された機器を使用する場合には
特定の視点を基準に出光面を見るので、視点から見た出
光面の微小部分と視点とを結ぶ直線が、前記微小部分の
法線方向近傍に位置する部分は所定の輝度で視認できる
が、法線方向近傍から外れた部分は所定の輝度より低い
輝度に見えるという問題があった。特に比較的大画面の
パネルに用いられるバックライトではこの輝度低下は深
刻な問題となっていた。However, in the above-mentioned method, although the power consumption-luminance conversion efficiency in the normal direction of the light exit surface of the light guide plate is improved, as shown in FIG. 6, a preset specific viewpoint (for example, in the figure) is used. The angle formed by the straight line connecting P) and an arbitrary point on the light exit surface of the light guide plate and the light exit surface are different, so that the brightness observed at a specific viewpoint (P in the figure) depends on the location of the light exit surface of the light guide plate. There was the problem of being different. As a result, even if the luminance of the minute portion of any light-emitting surface of the light guide plate in the normal direction is substantially equal to each other, when a device in which the backlight is actually used is used, a specific viewpoint is required. Since the light emitting surface is viewed as a reference, the straight line connecting the minute portion of the light emitting surface seen from the viewpoint and the viewpoint can be visually recognized at a predetermined brightness in the portion located near the normal direction of the minute portion, but near the normal direction. There is a problem that the part outside the area looks lower in brightness than a predetermined brightness. Especially in a backlight used for a panel having a relatively large screen, this decrease in brightness has been a serious problem.
【０００５】例えば、バックライトを搭載した１０イン
チクラスの表示パネルで、その左上の部分の法線方向に
視点がある場合、視点直下の部分の画面は明るく見えて
いても、同一視点で表示パネルの右下の部分を見る場
合、その部分の画面はかなり輝度が低下した状態で見る
ことになる。特に、直線状頂稜を持つプリズムの頂角
（凸部の角度）が９０度〜１００度付近のシ−トを用い
た場合は、前記した状態で出光面を見ると、殆ど光線が
視認できなくなる部分が存在するためより一層問題とな
っていた。For example, in a 10-inch class display panel equipped with a backlight, when the viewpoint is in the direction of the normal line at the upper left part of the display panel, even if the screen immediately below the viewpoint looks bright, the display panel has the same viewpoint. If you look at the lower right part of the screen, you will see that part of the screen with considerably reduced brightness. In particular, when a sheet with a vertical angle (the angle of the convex portion) of a prism having a straight apex is in the vicinity of 90 ° to 100 °, almost all light rays can be seen when the light exit surface is viewed in the above-mentioned state. It was even more problematic because there were parts that disappeared.
【０００６】このような問題を解決するために、常に視
点が出光面の法線方向に一致するように、表示パネルの
利用者が見ようとする部分に合わせて視点を移動（頭を
出光面に対して平行移動）することも考えられるが、そ
の都度このように体を移動させることは必ずしも現実的
ではない。In order to solve such a problem, the viewpoint is moved so that the viewpoint always coincides with the direction of the normal line of the light emitting surface (the head is moved to the light emitting surface in accordance with the portion to be viewed by the user of the display panel). It may be possible to move in parallel), but it is not always realistic to move the body in this way.
【０００７】[0007]
【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、かつ任意の視点から見た出
光面上の任意の点の明るさ（輝度）がより均一なバック
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 with high power consumption-luminance conversion efficiency and more uniform brightness (luminance) at any point on the light emitting surface seen from any viewpoint. To provide.
【０００８】[0008]
【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、導光板の出光面側に、
配置する透光性シ−トについて、同シートの面に構成し
たプリズム又は凸部を、視点に応じて、特定の配列にし
たシートを使用することにより、特定の視点から見た出
光面上の任意の点の明るさ（輝度）がより均一なバック
ライトとなることを見出した。Means for Solving the Problems As a result of various examinations on the above points, the present inventors have found that the
Regarding the translucent sheet to be arranged, by using a sheet in which prisms or convex portions formed on the surface of the sheet are arranged in a specific arrangement according to the viewpoint, the sheet on the light emitting surface viewed from the specific viewpoint is used. It was found that the brightness (luminance) at any point becomes a more uniform backlight.
【０００９】即ち本発明は、透光性材料からなる導光板
の一方の広い面を出光面とし、その出光面側に透光性材
料からなるシ−トを配置し、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
ックライトに於いて、前記シ−トが、シートの出光面の
微小部分から放出される光の主光線が、出光面側であら
かじめ設定した視点方向に指向するように配列された線
状の頂稜を持つ断面が三角形のプリズム又は同断面が山
型の凸部を持つシ−トであってこれを１枚以上配置した
パネル用バックライトに関するものである。That is, according to the present invention, one wide surface of the light guide plate made of a translucent material is used as a light emitting surface, and a sheet made of a light transmissive material is arranged on the light emitting surface side, and at least one of the light guide plates is arranged. In a backlight for a panel having a linear light source close to the side edge portion, the sheet is such that the principal ray of light emitted from a minute portion of the light emitting surface of the sheet is preset on the light emitting surface side. A prismatic prism having a triangular cross-section having linear apexes arranged so as to be oriented in the viewing direction or a sheet having a mountain-shaped convex portion having the same cross-section, and a panel back in which one or more of these are arranged. It's about lights.
【００１０】次に本発明を図面に基づいて詳述する。図
７は、導光板の少なくとも一端部に光源を持つエッジラ
イト方式の一実施態様の斜視図であり、図８はその断面
図で、Ｐ点近傍に視点を置いた場合を想定した出光面側
の出光状態を示す図である。Next, the present invention will be described in detail with reference to the drawings. FIG. 7 is a perspective view of an embodiment of an edge light system having a light source at least at one end of a light guide plate, and FIG. 8 is a cross-sectional view of the same, showing a light emitting surface side assuming a viewpoint near point P. It is a figure which shows the light emission state of.
【００１１】図７，８中１は導光板であり、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ある。
エッジライト方式で導光板の出光面から光線を出射させ
るための一方法は、導光板の広い表面、例えば出光面の
反対側の面に光拡散性を付与することであるが、この方
法は、例えば、光散乱性物質（例えばＴｉＯ2 、ＢａＳ
Ｏ4 、ＳｉＯ2 等）を含んだ塗料、印刷インキ等をスク
リ−ン印刷等の方法で導光板面上にドット状又はストラ
イプ状に印刷しても良いし（図中６）、導光板の表面を
粗面化するか、小孔を開けるか、小突起を付与するなど
しても良いし、又、導光板中に微細な間隔で屈折率が異
なる例えば高分子ポリマ−を分散させた状態としても良
い。In FIGS. 7 and 8, reference numeral 1 denotes a light guide plate, which may be made of any substance that allows light to pass through efficiently, and may be quartz, glass, translucent natural or synthetic resin such as acrylic resin.
One method for emitting light rays from the light exit surface of the light guide plate by the edge light method is to impart light diffusivity to a wide surface of the light guide plate, for example, a surface opposite to the light exit surface, but this method is For example, a light-scattering substance (eg, TiO 2 , BaS)
O 4, paints containing SiO 2, etc.), printing inks, etc. Subscription - may be printed in a dot shape or a stripe shape on the light guide plate surface in the process of screen printing or the like (figure 6), the light guide plate The surface may be roughened, small holes may be formed, small protrusions may be provided, or a state in which a polymer having a different refractive index at fine intervals is dispersed in the light guide plate, for example, is dispersed. Also good.
【００１２】４は線状光源（棒状光源）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）を有する光反射器５で、線状光源の光源面
とある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。前記線状光源は、
蛍光管、タングステン白熱管、オプティカルロッド、Ｌ
ＥＤ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。Reference numeral 4 denotes a linear light source (rod-shaped light source), and in a preferred embodiment, a light reflector 5 having a gap (slit) at the end of the light guide plate for allowing light to enter the light source surface of the linear light source. It is covered with a certain gap, 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. The linear light source,
Fluorescent tube, tungsten incandescent tube, optical rod, L
Although there are those in which EDs are arranged, a fluorescent tube is preferable, and from the viewpoint of power saving, it is preferable that the length of the uniform light emitting portion excluding the electrode portion is substantially equal to the length of the end portion of the adjacent light guide plate.
【００１３】光反射板（図中３）は導光板の出光面と反
対側の面のほぼ全面を覆うように配置するが、導光板の
線状光源を近接させていない残りの端部面のほぼ全面を
も覆うように配置すると光の利用効率及び均一な面状発
光を得る点で更に良い。The light reflection plate (3 in the figure) is arranged so as to cover almost the entire surface of the light guide plate on the side opposite to the light emitting surface, but the remaining end surface of the light guide plate which is not in close proximity to the linear light source. It is even better to dispose so as to cover almost the entire surface in terms of light utilization efficiency and uniform planar light emission.
【００１４】９は透光性シートで、後述するように、断
面が三角形で線状の頂稜を持つプリズム、又は、断面が
山型で線状の頂稜を持つ凸部が、同一平面に微細間隔で
多数並列した透光性材料からなるシートで、その材質は
例えば、メタクリル酸エステル、ポリカ−ボネイト、ポ
リ塩化ビニル、ポリスチレン、ポリアミド、ポリエステ
ル、ポリエチレン、ポリプロピレン、繊維素系樹脂、ガ
ラス等である。Reference numeral 9 denotes a translucent sheet, and as will be described later, a prism having a triangular cross section and a linear apex, or a convex portion having a mountain-shaped cross section and a linear apex is formed in the same plane. A sheet made of a translucent material arranged in parallel at a fine interval, and the material thereof is, for example, methacrylic acid ester, polycarbonate, polyvinyl chloride, polystyrene, polyamide, polyester, polyethylene, polypropylene, fibrous resin, glass or the like. is there.
【００１５】本発明はこの透光性シートを導光板の出光
面側に配置する際、透光性シートを通して、その任意の
微小部分から出光する光線の主ピ−ク（図８で図示した
８）の向かう方向（指向性の方向）が、特定の範囲に集
まるように配列されたプリズム又は凸部を持つ透光性シ
ートを１枚以上配置したことが特徴である。According to the present invention, when the light-transmitting sheet is arranged on the light-exiting surface side of the light guide plate, the main peak of a light beam emitted from an arbitrary minute portion through the light-transmitting sheet (8 shown in FIG. 8). The direction (direction) of (1) is characterized by disposing one or more light-transmitting sheets having prisms or convex portions arranged so as to gather in a specific range.
【００１６】本発明は、このようなシートを用いること
により、バックライトの出光面より出光した光の指向性
を変化させ、特定の視点から測定した輝度を発光面全域
に渡ってより均一にすることができる。According to the present invention, by using such a sheet, the directivity of the light emitted from the light emitting surface of the backlight is changed, and the luminance measured from a specific viewpoint is made more uniform over the entire light emitting surface. be able to.
【００１７】尚、バックライトの出光面の任意の点から
の光線が指向性を持たない、いわゆる完全拡散光である
場合も、特定の視点から測定した輝度は発光面全域に渡
って実質的に均一となるが、前記特定の視点から測定し
た消費電力−輝度変換効率は本発明の場合と比較すると
著しく低い。Even when a light ray from an arbitrary point on the light emitting surface of the backlight is a so-called completely diffused light having no directivity, the brightness measured from a specific viewpoint is substantially over the entire light emitting surface. Although it is uniform, the power consumption-luminance conversion efficiency measured from the specific viewpoint is significantly lower than that of the present invention.
【００１８】本発明で用いる光拡散シ−トの表面形状
は、図９にその一例の断面を示したが、シートの同一面
に微細な間隔で直線状又は曲線状頂稜を持つプリズム
が、又は、図１０に示したように同一面に微細な間隔で
直線状又は曲線状頂稜を持つ凸部が多数存在する形状で
ある。The surface shape of the light diffusion sheet used in the present invention is shown in FIG. 9 as an example of its cross section. A prism having straight or curved apex ridges on the same surface of the sheet at fine intervals Alternatively, as shown in FIG. 10, it has a shape in which a large number of convex portions having straight or curved apex ridges are present on the same surface at minute intervals.
【００１９】次にプリズムを形成した透光性シートを用
いた例について、シート上でのプリズムの配列例を説明
する。一般にプリズムは、光学的平面を２つ以上持つ
が、本発明では透光性シートを介した出光面の、あらか
じめ設定した視点、即ち、通常の作業状態で出光面に相
対した時の視点直下近傍以外に配置したプリズムが、そ
の線状の頂稜に垂直な断面を見た場合、断面を形成する
３角形の頂点を中心とした２辺が、あらかじめ設定した
視点側の辺の長さに対する他の辺の長さの比が、シート
上のあらかじめ設定した視点直下から離れるに従って小
（２辺の左右非対象の度合が小）となるようにプリズム
が配列されていることである。Next, with respect to an example using a translucent sheet having prisms formed thereon, an example of arrangement of prisms on the sheet will be described. Generally, a prism has two or more optical planes, but in the present invention, the light-emitting surface through a light-transmitting sheet has a preset viewpoint, that is, immediately below the viewpoint when facing the light-emitting surface in a normal working state. When the cross section of the prism arranged other than is perpendicular to the linear apex, the two sides centering on the apexes of the triangles forming the cross section are other than the preset length of the side on the viewpoint side. That is, the prisms are arranged so that the ratio of the lengths of the sides becomes smaller (the degree of asymmetry of the left and right sides of the two sides is smaller) as the distance from the position directly below the preset viewpoint on the sheet decreases.
【００２０】個々のプリズムの形状はバックライトの出
光面から出射する指向性のある光線の主ピ−クの進む方
向と、プリズムの屈折率、プリズムを取り囲む物質（通
常は空気でｎ＝１）の屈折率、前記出光面と前記特定の
範囲（設定された視点）とを結ぶ直線の方向から、スネ
ルの法則によって計算される。例えば、図１１に示した
ようなプリズムの場合、入射角をθ1 、出射角をθ2 、
プリズムの入射面と出射面とがなす角度をΦ、プリズム
の屈折率をｎ2 、プリズムを取り囲む物質の屈折率をｎ
1 とすると、スネルの法則よりΦを求める式は Φ＝ｔａｎ-1（（ｎ1 ｓｉｎθ2 −ｎ2 ｓｉｎθ1 ）／
（ｎ1 ｃｏｓθ2 −ｎ2 ｃｏｓ（ｓｉｎ-1（ｎ1 ｓｉｎ
θ1 ／ｎ2 ））））となる。The shape of each prism is the direction in which the main peak of a directional light beam emitted from the light exit surface of the backlight advances, the refractive index of the prism, and the substance surrounding the prism (usually n = 1 for air). Is calculated by Snell's law from the refractive index of, and the direction of a straight line connecting the light output surface and the specific range (set viewpoint). For example, in the case of a prism as shown in FIG. 11, the incident angle is θ 1 , the outgoing angle is θ 2 ,
The angle between the entrance surface and the exit surface of the prism is Φ, the refractive index of the prism is n 2 , and the refractive index of the substance surrounding the prism is n.
If it is set to 1 , the formula for obtaining Φ from Snell's law is Φ = tan −1 ((n 1 sin θ 2 −n 2 sin θ 1 ) /
(N 1 cos θ 2 −n 2 cos (sin −1 (n 1 sin
θ 1 / n 2 )))).
【００２１】本発明で用いるシートの他の例として、図
１０に示したような断面の一辺の形状が円弧状を持った
シートがある。これら個々の凸状の形状も基本的には前
述したスネルの法則より求めることができるが、レンズ
設計で用いられている公知の種々の計算式を用いれば更
に容易に求めることができる。As another example of the sheet used in the present invention, there is a sheet having a cross section of one side having an arc shape as shown in FIG. Basically, these individual convex shapes can also be obtained by the Snell's law described above, but can be obtained more easily by using various known formulas used in lens design.
【００２２】シ−トのプリズム又は凸部の頂稜の形状は
直線状でも曲線状でも良い。前記形状が図１２に示した
ように直線状であれば前記特定の範囲を最も狭くした場
合直線状になるし、前記形状が図１３に示したように曲
線状であれば前記特定の範囲を最も狭くした場合円形状
になる。従って、要求される特定の範囲によって適宜選
択すれば良い。The shape of the apex of the prism or the convex portion of the sheet may be linear or curved. If the shape is linear as shown in FIG. 12, it becomes linear when the specific range is narrowed, and if the shape is curved as shown in FIG. It becomes circular when it is narrowest. Therefore, it may be appropriately selected according to the required specific range.
【００２３】シートに形成した多数の頂稜の分布状態
は、表面から出光される光によってこれら同士の間隔が
視認されにくくする上で、互いに平行で隣り合った頂稜
と頂稜の間隔は１〜１０００μm であることが好まし
い。そして前記シ−トの厚さはバックライトの薄型化の
ためには薄い方が良いが、製造上の理由及び強度の点か
ら、１０〜３０００μm 、好ましくは５０〜１０００μ
m が良い。また、同一面に形成する直線状又は曲線状頂
稜は、導光板の出光面の任意の微小エリアからの光線の
主ピ−クの向かう方向が特定の範囲に集まるように少し
ずつ異なる状態にすることが好ましい。The distribution state of a large number of apexes formed on the sheet makes it difficult for the light emitted from the surface to visually recognize the intervals between them, and the interval between the apexes and the apexes that are parallel to each other is 1 It is preferably about 1000 μm. The thickness of the sheet is preferably thin in order to reduce the thickness of the backlight, but is 10 to 3000 μm, preferably 50 to 1000 μm from the viewpoint of manufacturing reasons and strength.
m is good. In addition, the straight or curved apex formed on the same surface is in a slightly different state so that the directions of the main peaks of light rays from an arbitrary minute area of the light exit surface of the light guide plate converge in a specific range. Preferably.
【００２４】少しずつ異なる個々のプリズム又は凸部の
形状を更に詳述すると、シ−トの入光面と出光面とのな
す角度（図１１中Φ）は、前述したΦを求める式からも
明らかなように、特定の範囲（視点直下）から離れるに
従って大きくなることが必要である。The shapes of the individual prisms or convex portions which are slightly different from each other will be described in more detail. The angle (Φ in FIG. 11) formed by the light entrance surface and the light exit surface of the sheet can be calculated from the above equation for finding Φ. Obviously, it is necessary to increase as the distance from the specific range (immediately below the viewpoint) increases.
【００２５】本発明で用いるシートを成形する方法は特
に限定されるものではなく、例えば熱プレスによる金型
成型加工、エンボス加工、鋳型加工、ベ−スフィルム上
に紫外線硬化樹脂を用いる方法、化学処理等の方法で同
一面に微細な間隔で直線状又は曲線状頂稜を持つプリズ
ム又は凸部を多数有し、前記プリズム又は凸部の形状が
少しずつ異なる状態に成形可能な方法であれば良い。
尚、製造上の理由から頂稜には若干のだれが生じるが、
本発明の効果が認められる範囲であれば良い。The method of molding the sheet used in the present invention is not particularly limited, and for example, mold molding by hot pressing, embossing, mold processing, a method of using an ultraviolet curable resin on a base film, chemical As long as the method has a number of prisms or convex portions having linear or curved apex ridges on the same surface at fine intervals by a method such as treatment, and the shape of the prisms or convex portions can be formed into slightly different states good.
It should be noted that, for manufacturing reasons, a slight sag occurs at the apex,
It may be within the range in which the effects of the present invention are recognized.
【００２６】バックライトの出光面からの光線の主ピ−
クの向かう方向が集まる特定の範囲とは、前記したよう
に、通常、バックライトを搭載した表示パネルの視点が
予想される部分である。例えば、ラップトップ型やノ−
ト型のパソコン、ワ−プロ等で文字を扱う場合は表示パ
ネルの中央部よりも左側中央寄りの部分の面から約４０
cmの部分の人間の目の位置が予想される場所であること
が多い。また、デスクトップ型のパソコン、ＣＡＤ等で
図形を扱う場合は表示パネルの中央部分の面から約４０
cmの部分の人間の目の位置が予想される場所であること
が多い。尚、人間の両目の間隔は通常７cm前後であるの
で、前記特定の範囲の大きさは７cm×１cmの横長の長方
形の大きさ以上が目安となる。A main light beam from the light emitting surface of the backlight.
As described above, the specific range in which the direction in which the light goes is usually the portion where the viewpoint of the display panel equipped with the backlight is expected. For example, laptop type
When handling characters on a laptop computer, word processor, etc., approximately 40 from the surface of the display panel that is closer to the center on the left side than the center.
It is often the place where the human eye position in cm is expected. Also, when dealing with figures on a desktop personal computer, CAD, etc., about 40 from the surface of the central part of the display panel.
It is often the place where the human eye position in cm is expected. Since the distance between both eyes of a human is usually around 7 cm, the size of the specific range should be at least the size of a horizontally long rectangle of 7 cm × 1 cm.
【００２７】[0027]
【発明の効果】本発明で、前記したように、特定形状の
透光性シートをバックライトの出光面に配すると、消費
電力−輝度変換効率が高く、かつ、特定の視点から見た
出光面上の任意の点の明るさ（輝度）がより均一なバッ
クライトが得られる。As described above, in the present invention, when the translucent sheet having a specific shape is arranged on the light emitting surface of the backlight, the power consumption-luminance conversion efficiency is high, and the light emitting surface seen from a specific viewpoint. A backlight having more uniform brightness (luminance) at any point above can be obtained.
【００２８】本発明は、消費電力−輝度変換効率が高
く、かつ視点から見た出光面上の任意の点の明るさ（輝
度）がより均一なバックライトとして使用できる。The present invention can be used as a backlight having a high power consumption-luminance conversion efficiency and a more uniform brightness (luminance) at any point on the light emitting surface viewed from the viewpoint.
【００２９】[0029]
【比較例及び実施例】次に比較例及び実施例で本発明を
更に詳述する。図１に示すような厚さ４mmの長方形導光
板（240 mm×150 mm）の短手の端部に、直径３mm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のスリットを持つようにポリ
エチレンテレフタレート（ＰＥＴ）に銀を蒸着した厚さ
0.05mmの光反射フィルム（三省物産株式会社製）で覆
い、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、導光板面上に被覆す
る光拡散物質（チタンホワイトを含む塗料）は、円形の
ドットパタ−ンを１mmピッチでスクリ−ン印刷したもの
であり下記の条件で作成して用いた。光拡散物質の被覆
率が、最小の地点（冷陰極蛍光管側）で６ %、最大の地
点（冷陰極蛍光管から最遠部側）で80 %、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した。導光
板の出光面とは反対側の面のほぼ全面をＰＥＴを発泡さ
せた光反射シ−ト（東レ株式会社製 E60L ）で覆った。COMPARATIVE EXAMPLES AND EXAMPLES Next, the present invention will be described in more detail with reference to Comparative Examples and Examples. A cold cathode fluorescent tube (made by Harrison Electric Co., Ltd.) with a diameter of 3 mm is arranged at the short end of a rectangular light guide plate (240 mm × 150 mm) having a thickness of 4 mm as shown in FIG.
Thickness of silver deposited on polyethylene terephthalate (PET) so that it has a 4mm slit in the part that contacts the light guide plate.
It was covered with a 0.05 mm light reflection film (manufactured by Sansho Bussan Co., Ltd.) and arranged so that the light emitted from the slit enters the light guide plate from the end portion of the light guide plate. On the other hand, the light diffusing substance (coating containing titanium white) coated on the surface of the light guide plate was a circular dot pattern screen-printed at a pitch of 1 mm, and was prepared and used under the following conditions. The light diffusing substance coverage is 6% at the minimum point (cold cathode fluorescent tube side), 80% at the maximum point (farthest side from the cold cathode fluorescent tube), and these ratios are increased in the middle. I made it a value. Substantially the entire surface of the light guide plate opposite to the light emitting surface was covered with a PET light-reflecting sheet (E60L manufactured by Toray Industries, Inc.).
【００３０】さらに、導光板の出光面側にＰＥＴに光散
乱物質をコ−ティングした厚さ 0.1mmの光拡散フィルム
（株式会社辻本電機製作所製 D-204）を１枚配置した。
冷陰極管に、インバ−タ（ＴＤＫ株式会社製 CXAL10-L
）より30 KHzの交番電圧をかけて６mAの電流で駆動さ
せたときの面輝度を、図１４に示した測定ポイントにつ
いて、輝度計（株式会社トプコン製 BM-7 ）により視野
角0.2 度、出光面に降ろした法線方向に対して、出光面
から輝度計までの距離 40 cmで測定したところ全ての測
定ポイントの輝度は1200cd/m2 ±10 %の範囲であった。
次に、各測定ポイントに対して図１５に示したように出
光面に降ろした法線方向に対して角度θ（-70 ≦θ≦7
0）度から輝度を測定した所、各測定ポイントとも実質
的に同様な結果が得られた。このことから出光面からの
光線の指向性は図２のようにあまりなく、完全拡散光に
近い出射分布であることが判明した。そして、図１４の
Ａ点の直上 40 cmの位置から測定した各測定ポイントの
輝度は実質的に同じであった。また、前記輝度計の位置
に目を位置させてバックライトの出光面を観察したとこ
ろ、バックライトの明るさは均一な状態だった（比較例
１）。Further, a 0.1 mm-thick light diffusing film (D-204 manufactured by Tsujimoto Electric Co., Ltd.) having a light scattering material coated on PET was arranged on the light emitting surface side of the light guide plate.
Inverter (TDK Corporation CXAL10-L
), A surface luminance when driven with a current of 6 mA by applying an alternating voltage of 30 KHz, with respect to the measurement points shown in FIG. When measured at a distance of 40 cm from the light emitting surface to the luminance meter with respect to the direction normal to the surface, the luminance at all measurement points was in the range of 1200 cd / m 2 ± 10%.
Next, as shown in FIG. 15, for each measurement point, an angle θ (−70 ≦ θ ≦ 7
When the brightness was measured from 0) degree, substantially the same result was obtained at each measurement point. From this, it was found that the directivity of light rays from the light exit surface was not so great as in FIG. 2, and the emission distribution was close to that of perfect diffused light. Then, the brightness at each measurement point measured from the position 40 cm immediately above the point A in FIG. 14 was substantially the same. Further, when the light emitting surface of the backlight was observed with the eyes positioned at the position of the luminance meter, the brightness of the backlight was in a uniform state (Comparative Example 1).
【００３１】次に、前記光拡散フィルムの上に、ポリカ
−ボネートからなる頂角が 90 度の互いに平行な直線状
プリズムを多数有する、直線状プリズムの隣り合った頂
稜と頂稜との間隔が 50 μm の間隔になるように加工し
た厚さ230 μm のシ−ト（住友スリ−エム株式会社製 B
EF90）をプリズムが外側になるようにバックライトの出
光面側に、プリズムの頂稜が光源の中心軸とほぼ平行と
なるように１枚配置した（図５に示した）以外は比較例
１と同一の装置、条件、で操作し、出光面に降ろした法
線方向に対して測定した全ての測定ポイントの輝度は18
00cd/m2 ±10 %の範囲であった。次に、各測定ポイント
に対して図１５に示したように出光面に降ろした法線方
向に対して角度θ（-70 ≦θ≦70）度から輝度を測定し
た所、各測定ポイントとも実質的に同様な結果が得られ
た。このことから出光面からの光線の指向性は図５のよ
うにバックライトの出光面の法線方向に強い主ピ−クが
存在する出射分布であることが判明した。Next, on the light-diffusing film, there are many parallel linear prisms made of polycarbonate and having an apex angle of 90 degrees. 230 μm thick sheet (Sumitomo 3M B
Comparative Example 1 except that one EF90) was arranged on the light emitting surface side of the backlight so that the prism was on the outside and the top edge of the prism was substantially parallel to the central axis of the light source (shown in FIG. 5). The brightness of all measurement points measured with respect to the direction normal to the light exit surface was 18 with the same equipment and conditions.
The range was 00 cd / m 2 ± 10%. Next, as shown in FIG. 15, for each measurement point, the luminance was measured from the angle θ (-70 ≤ θ ≤ 70) degrees with respect to the direction normal to the light emitting surface. Similar results were obtained. From this, it was found that the directivity of the light rays from the light emitting surface is an emission distribution in which a strong main peak exists in the normal direction of the light emitting surface of the backlight as shown in FIG.
【００３２】そして、図１４のＡ点の直上 40 cmの位置
から測定した各測定ポイントの輝度はＡ点からの距離が
遠い（すなわち、輝度計と測定ポイントを結ぶ直線と出
光面とのなす角度が出光面の法線方向から離れる）測定
ポイント程輝度は低下し、Ｆ点に至っては600 cd/m2 だ
った。また、前記輝度計の位置に目を位置させてバック
ライトの出光面を観察したところ、Ａ点からの距離が遠
い程暗く見えてバックライトの明るさは極めて不均一な
状態だった（比較例２）。The brightness at each measurement point measured from a position 40 cm directly above point A in FIG. 14 is far from the point A (that is, the angle between the straight line connecting the brightness meter and the measurement point and the light emitting surface). However, the luminance decreased as the measurement point increased to 600 cd / m 2 at the point F. Further, when the light emitting surface of the backlight was observed with the eyes positioned at the position of the luminance meter, it became darker as the distance from the point A was longer, and the brightness of the backlight was extremely uneven (Comparative Example). 2).
【００３３】次に直線状プリズムを多数有するシ−トの
代わりに、フィルムの上に、厚さ 50 μm のＰＥＴのベ
−スフィルムの上に印刷法によって紫外線硬化樹脂で多
数の直線状凸部を、凸部の底面の幅が 50 μm 、底面か
ら凸部までの高さが 25 μm、凸部と凸部の間隔が 50
μm になるように形成した図４に示すようなシ−トを用
いた以外は比較例２と同一の装置、条件、で操作し、出
光面に降ろした法線方向に対して測定した全ての測定ポ
イントの輝度は1650cd/m2 ±10 %の範囲であった。次
に、各測定ポイントに対して図１５に示したように出光
面に降ろした法線方向に対して角度θ（-70 ≦θ≦70）
度から輝度を測定した所、各測定ポイントとも実質的に
同様な結果が得られた。このことから出光面からの光線
の指向性は図５のようにバックライトの出光面の法線方
向に強い主ピ−クが存在する出射分布であることが判明
した。そして、図１４のＡ点の直上 40 cmの位置から測
定した各測定ポイントの輝度はＡ点からの距離が遠い
（すなわち、輝度計と測定ポイントを結ぶ直線と出光面
とのなす角度が出光面の法線方向から離れる）測定ポイ
ント程低下し、Ｆ点に至っては700 cd/m2 であった。ま
た、前記輝度計の位置に目を位置させてバックライトの
出光面を観察したところ、Ａ点からの距離が遠い程暗く
見えてバックライトの明るさは極めて不均一な状態だっ
た（比較例３）。Next, instead of the sheet having a large number of linear prisms, a large number of linear convex portions were formed on the film by a printing method on a PET base film having a thickness of 50 μm with an ultraviolet curing resin. The width of the bottom of the protrusion is 50 μm, the height from the bottom to the protrusion is 25 μm, and the space between the protrusions is 50 μm.
The same apparatus and conditions as in Comparative Example 2 were used except that the sheet as shown in FIG. The luminance at the measurement point was in the range of 1650 cd / m 2 ± 10%. Next, as shown in FIG. 15, for each measurement point, an angle θ (-70 ≤ θ ≤ 70) with respect to the normal direction dropped to the light exit surface.
When the luminance was measured from the degree, substantially the same result was obtained at each measurement point. From this, it was found that the directivity of the light rays from the light emitting surface is an emission distribution in which a strong main peak exists in the normal direction of the light emitting surface of the backlight as shown in FIG. Then, the brightness of each measurement point measured from a position 40 cm immediately above the point A in FIG. 14 is far from the point A (that is, the angle between the straight line connecting the luminance meter and the measurement point and the light emitting surface is the light emitting surface). The measurement point decreased from the normal direction of () to 700 cd / m 2 at the point F. Further, when the light emitting surface of the backlight was observed with the eyes positioned at the position of the luminance meter, it became darker as the distance from the point A was longer, and the brightness of the backlight was extremely uneven (Comparative Example). 3).
【００３４】次に、比較例２のバックライトの出光面の
外側に、図９に示したような断面形状のＰＥＴからなる
シートを、バックライトの出光面の任意の微小エリアか
らの光線の主ピ−クの向かう方向が測定ポイントＡの直
上 40 cmの位置に集まるように、即ち、前記したスネル
の式で求めたΦの値が、シート上のＡ点の直下から離れ
るに従って小となるようにし、最遠部では 46 度となる
プリズム形状で、互いに平行な直線状プリズムを多数有
し、直線状プリズムの隣り合った頂稜と頂稜との間隔が
50 μm の間隔になるように加工した厚さ230 μm のシ
−トをプリズムが外側になるようにバックライトの出光
面側に１枚配置した以外は比較例１と同一の装置、条
件、で操作し、出光面に降ろした法線方向に対して測定
した測定ポイントＡの輝度は1800cd/m2 であった。しか
し、その他の各測定ポイントの出光面に降ろした法線方
向に対して測定した輝度はＡ点からの距離が遠い（すな
わち、輝度計と測定ポイントを結ぶ直線と出光面とのな
す角度が出光面の法線方向から離れる）測定ポイント程
低下し、Ｆ点に至っては750 cd/m2 であった。Next, a sheet made of PET having a cross-sectional shape as shown in FIG. 9 is provided on the outside of the light emitting surface of the backlight of Comparative Example 2, and a sheet of main light rays from an arbitrary minute area of the light emitting surface of the backlight is provided. The direction of the peak should be gathered at a position 40 cm directly above the measurement point A, that is, the value of Φ obtained by the Snell's formula should become smaller as it goes away from just below point A on the sheet. The prism shape is 46 degrees at the farthest part, and there are many linear prisms that are parallel to each other, and the distance between adjacent apexes of the linear prisms is
The same apparatus and conditions as in Comparative Example 1 were used except that a 230 μm-thick sheet processed to have an interval of 50 μm was arranged on the light emitting surface side of the backlight so that the prism was on the outside. The luminance of the measurement point A, which was operated and measured in the normal direction to the light-emitting surface, was 1800 cd / m 2 . However, the luminance measured with respect to the normal direction dropped to the light emitting surface of each of the other measurement points is far from the point A (that is, the angle between the straight line connecting the luminance meter and the measuring point and the light emitting surface is the light emitting surface). The measurement point decreased (distance from the normal direction of the surface), and it reached 750 cd / m 2 up to point F.
【００３５】次に、図１５に示したように、各測定ポイ
ントに降ろした法線方向に対して角度θ（-70 ≦θ≦7
0）度から輝度を測定した所、各測定ポイントとも異な
った結果が得られた。このことから本バックライトの出
光面からの光線の指向性は図８に示したようにバックラ
イトの出光面の任意の微小エリアからの光線の主ピ−ク
の向かう方向が特定の範囲（図中左上）に集まる状態で
あることが判明した。そして、図１４のＡ点の直上40cm
の位置から測定した各測定ポイントの輝度は実質的に同
じだった。又、前記輝度計の位置に目を位置させてバッ
クライトの出光面を観察したところ、バックライトの明
るさは均一な状態だった（実施例１）。Next, as shown in FIG. 15, an angle θ (-70 ≤ θ ≤ 7 with respect to the normal direction lowered to each measurement point).
When the luminance was measured from 0) degree, different results were obtained at each measurement point. Therefore, as shown in FIG. 8, the directivity of the light rays from the light emitting surface of the backlight is such that the direction of the main peak of the light rays from an arbitrary minute area of the light emitting surface of the backlight is in a specific range (Fig. It was found to be in a state of gathering in the upper left). And 40 cm just above point A in FIG.
The brightness of each measurement point measured from the position of was substantially the same. Moreover, when the light emitting surface of the backlight was observed with the eyes positioned at the position of the luminance meter, the brightness of the backlight was in a uniform state (Example 1).
【００３６】次に、比較例２のバックライトの出光面の
外側に、図１０に示したような断面形状のＰＥＴからな
るシートを、バックライトの出光面の任意の微小エリア
からの光線の主ピ−クの向かう方向が測定ポイントＡの
直上 40 cmの位置に集まるように、即ち、前記したスネ
ルの式で求めたΦ（断面が３角形とした場合底辺と長い
辺とでなす角度）の値が、シート上のＡ点の直下から離
れるに従って大となるようにし、最遠部では 46 度とな
る凸部の形状で、互いに平行な直線状凸部を多数有し、
凸部の隣り合った頂稜と頂稜との間隔が50μm の間隔に
なるように加工したシ−ト（厚さ230 μm ）を、凸部が
外側になるように図８に示したようにバックライトの出
光面側に１枚配置した以外は実施例１と同一の装置、条
件、で操作し、出光面に降ろした法線方向に対して測定
した測定ポイントＡの輝度は1560cd/m2 であった。しか
し、その他の各測定ポイントの出光面に降ろした法線方
向に対して測定した輝度はＡ点からの距離が遠い（すな
わち、輝度計と測定ポイントを結ぶ直線と出光面とのな
す角度が出光面の法線方向から離れる）測定ポイント程
低下した。Next, a sheet made of PET having a cross-sectional shape as shown in FIG. 10 is provided on the outside of the light emitting surface of the backlight of Comparative Example 2, and a sheet of main light rays from an arbitrary minute area of the light emitting surface of the backlight is provided. The direction of the peak should be 40 cm directly above the measurement point A, that is, Φ (the angle formed by the base and the long side when the cross section is a triangle) obtained by the Snell's formula. The value becomes larger as it goes away from just below point A on the sheet, and it has a shape of a convex part that becomes 46 degrees at the farthest part, and has a large number of parallel linear convex parts,
As shown in Fig.8, a sheet (thickness: 230 μm) was machined so that the distance between adjacent peaks of adjacent convex parts was 50 μm. The brightness of the measurement point A measured with respect to the normal direction lowered to the light emitting surface was 1560 cd / m 2 by operating under the same apparatus and conditions as in Example 1 except that one sheet was arranged on the light emitting surface side of the backlight. Met. However, the luminance measured with respect to the normal direction dropped to the light emitting surface of each of the other measurement points is far from the point A (that is, the angle between the straight line connecting the luminance meter and the measuring point and the light emitting surface is the light emitting surface). The distance decreased from the measurement point (away from the surface normal direction).
【００３７】次に、各測定ポイントに対して図１５に示
したように各測定ポイントに降した法線方向に対して角
度θ（-70 ≦θ≦70）度から輝度を測定した所、実施例
１と同様に各測定ポイントとも異なった結果が得られ
た。このことから出光面からの光線の指向性は図８のよ
うにバックライトの出光面の任意の微小エリアからの光
線の主ピ−クの向かう方向が特定の範囲に集まる状態で
あることが判明した。そして、図１４のＡ点の直上40cm
の位置から測定した各測定ポイントの輝度は実質的に同
じだった。又、前記輝度計の位置に目を位置させてバッ
クライトの出光面を観察したところ、バックライトの明
るさは均一な状態だった（実施例２）。Next, as shown in FIG. 15, for each measurement point, the brightness was measured from the angle θ (-70 ≤ θ ≤ 70) degrees with respect to the normal direction descending to each measurement point. As in Example 1, different results were obtained at each measurement point. From this, it is found that the directivity of the light rays from the light emitting surface is a state in which the direction of the main peak of the light rays from any minute area of the light emitting surface of the backlight is gathered in a specific range as shown in FIG. did. And 40 cm just above point A in FIG.
The brightness of each measurement point measured from the position of was substantially the same. Further, when the light emitting surface of the backlight was observed with the eyes positioned at the position of the luminance meter, the brightness of the backlight was uniform (Example 2).
【００３８】次に、同一面に微細な間隔で図１３のよう
に曲線状頂稜を持つプリズムが多数有する透光性材料か
らなるシ−トを、前記出光面の任意の微小エリアからの
光線の主ピ−クの向かう方向が特定の範囲に集まるよう
に、前記シ−トのプリズム又は凸部の形状が少しずつ異
なる状態に、１枚配置した以外は実施例１と同一の装
置、条件で操作したところ、実施例１と同様な結果が得
られた（実施例３）。Next, a sheet made of a translucent material having a large number of prisms having curved apexes on the same surface at fine intervals as shown in FIG. The same apparatus and conditions as in Example 1 except that one sheet is arranged so that the shapes of the prisms or convex portions of the sheet are slightly different from each other so that the directions of the main peaks of the sheet gather in a specific range. The same result as in Example 1 was obtained when operated in Example 3 (Example 3).
【図１】エッジライト方式のバックライトの一例を示す
斜視図FIG. 1 is a perspective view showing an example of an edge light type backlight.
【図２】エッジライト方式のバックライトの一例を示す
断面図FIG. 2 is a sectional view showing an example of an edge light type backlight.
【図３】直線状の頂稜を持つプリズムが微細な間隔で並
列するシ−トを示す図FIG. 3 is a view showing a sheet in which prisms having linear apexes are arranged in parallel at fine intervals.
【図４】直線状の頂稜を持つ山型（凸部）が微細な間隔
で並列するシ−トを示す図FIG. 4 is a diagram showing a sheet in which mountain-shaped portions (projections) having straight apexes are arranged in parallel at fine intervals.
【図５】図３又は図４のシ−トを配したエッジライト方
式のバックライトの一例を示す断面図5 is a cross-sectional view showing an example of an edge light type backlight in which the sheets of FIG. 3 or 4 are arranged.
【図６】視点（Ｐ）と導光板の出光面との関係を示す図FIG. 6 is a diagram showing a relationship between a viewpoint (P) and a light exit surface of a light guide plate.
【図７】本発明の一実施態様の斜視図FIG. 7 is a perspective view of an embodiment of the present invention.
【図８】本発明の一実施態様の断面図FIG. 8 is a sectional view of an embodiment of the present invention.
【図９】本発明で用いる微細な間隔でプリズムが多数有
するシ−トの一例の断面図FIG. 9 is a sectional view of an example of a sheet having a large number of prisms at fine intervals used in the present invention.
【図１０】本発明で用いる微細な間隔で凸部が多数有す
るシ−トの一例の断面図FIG. 10 is a cross-sectional view of an example of a sheet having a large number of convex portions at fine intervals used in the present invention.
【図１１】プリズムの形状と、入射光線、出射光線の関
係を示す図FIG. 11 is a diagram showing the relationship between the shape of a prism and incident and emitted rays.
【図１２】本発明で用いる直線状頂稜をもつシ−トの一
例を示す平面図FIG. 12 is a plan view showing an example of a sheet having a straight apex used in the present invention.
【図１３】本発明で用いる曲線状頂稜をもつシ−トの一
例を示す平面図FIG. 13 is a plan view showing an example of a sheet having a curved apex used in the present invention.
【図１４】バックライトの出光面の測定ポイントを示す
図FIG. 14 is a diagram showing measurement points on a light emitting surface of a backlight.
【図１５】本発明で用いた輝度測定方法の概念図FIG. 15 is a conceptual diagram of a luminance measuring method used in the present invention.
１：導光板 ２：光拡散板 ３：反射板 ４：線状光源 ５：反射器 ６：光拡散物質 ７：プリズム又は凸部を持つシ−ト ８：出光面からの光線の主ピ−ク ９：本発明で用いるプリズム又は凸部の形状が順次異な
るシ−ト １０：バックライト １１：輝度計 １２：出光面に降した法線方向に対しての角度1: Light guide plate 2: Light diffusing plate 3: Reflecting plate 4: Linear light source 5: Reflector 6: Light diffusing material 7: Sheet having prism or convex portion 8: Main peak of light beam from light emitting surface 9: Sheets in which the shapes of prisms or convex portions used in the present invention are sequentially different 10: Backlight 11: Luminance meter 12: Angle with respect to the normal direction to the light exit surface
Claims (3)
を出光面とし、その出光面側に透光性材料からなるシ−
トを配置し、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於
いて、前記シ−トが、シートの出光面の微小部分から放
出される光の主光線が、出光面側であらかじめ設定した
視点方向に指向するように配列された線状の頂稜を持つ
断面が三角形のプリズム又は同断面が山型の凸部を持つ
シ−トであってこれを１枚以上配置したパネル用バック
ライト。1. A light guide plate made of a light transmissive material has one wide surface as a light exit surface, and a sheet made of a light transmissive material is provided on the light exit surface side.
In a backlight for a panel having a linear light source disposed at an end of at least one side surface of the light guide plate, the sheet emits light emitted from a minute portion of a light emitting surface of the sheet. Is a prism with a triangular cross section having linear apexes arranged so that the chief ray of the light is directed in a preset viewing direction on the light exit surface side, or a sheet having a mountain-shaped convex section. A backlight for a panel that has one or more of these.
直な断面の頂点を挟んだ辺の長さの比（あらかじめ設定
した視点側の辺の長さに対する他の辺の長さの比）が、
シート上のあらかじめ設定した視点直下から離れるに従
って小となるようにプリズム又は凸部が配列されたシ−
トを用いた請求項１記載のパネル用バックライト。2. A ratio of lengths of sides sandwiching a vertex of a cross section perpendicular to a linear apex of a prism or a convex portion (lengths of other sides with respect to a preset side length on the viewpoint side). Ratio),
A sheet in which prisms or projections are arranged so that they become smaller as they move away from directly below the preset viewpoint on the sheet.
The backlight for a panel according to claim 1, wherein a backlight is used.
又は凸部の線状の頂稜に対して垂直な断面の頂点を挟ん
だ辺の長い辺とのなす角度が、シート上のあらかじめ設
定した視点直下から離れるに従って大となる請求項１又
は２記載のパネル用バックライト。3. The angle formed by the light incident surface of the sheet and the long side of the side of the prism on the light emitting surface, which is sandwiching the apex of the cross section perpendicular to the linear apex of the prism, The backlight for a panel according to claim 1 or 2, which becomes larger as it goes away from a position directly below a preset viewpoint on the sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6109363A JPH07318729A (en) | 1994-05-24 | 1994-05-24 | Back light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6109363A JPH07318729A (en) | 1994-05-24 | 1994-05-24 | Back light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07318729A true JPH07318729A (en) | 1995-12-08 |
Family
ID=14508339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6109363A Pending JPH07318729A (en) | 1994-05-24 | 1994-05-24 | Back light |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07318729A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002008662A1 (en) * | 2000-07-24 | 2002-01-31 | Mitsubishi Rayon Co., Ltd. | Surface illuminant device and prism sheet used therefor |
| KR20030055378A (en) * | 2001-12-24 | 2003-07-04 | 엘지.필립스 엘시디 주식회사 | The backlight unit of liquid crystal display |
| KR20030055377A (en) * | 2001-12-24 | 2003-07-04 | 엘지.필립스 엘시디 주식회사 | The backlight unit of liquid crystal display |
| KR100561281B1 (en) * | 2001-08-27 | 2006-03-15 | 오므론 가부시키가이샤 | Image display apparatus and front right |
| JP2007003951A (en) * | 2005-06-24 | 2007-01-11 | Nec Corp | Optical member, light source device, display device and terminal device |
| KR100690504B1 (en) * | 2004-10-19 | 2007-03-09 | 주식회사 우영 | Light guide panel of back light unit, Upper main molding core for forming the light emitting surface of the light guide panel for back light unit, and method for manufacturing the light guide panel for back light unit |
| JP2012083458A (en) * | 2010-10-08 | 2012-04-26 | Seiko Epson Corp | Virtual image display device |
| TWI485476B (en) * | 2011-05-31 | 2015-05-21 | Mitsubishi Electric Corp | Backlight device and liquid crystal display device |
| US9223137B2 (en) | 2010-10-08 | 2015-12-29 | Seiko Epson Corporation | Virtual image display apparatus |
| WO2017164117A1 (en) * | 2016-03-24 | 2017-09-28 | シャープ株式会社 | Display device and head mounted display |
| WO2017177654A1 (en) * | 2016-04-11 | 2017-10-19 | 京东方科技集团股份有限公司 | Display device |
-
1994
- 1994-05-24 JP JP6109363A patent/JPH07318729A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6799859B1 (en) | 2000-07-24 | 2004-10-05 | Mitsubishi Rayon Co., Ltd. | Surface illuminant device and prism sheet used therefor |
| WO2002008662A1 (en) * | 2000-07-24 | 2002-01-31 | Mitsubishi Rayon Co., Ltd. | Surface illuminant device and prism sheet used therefor |
| KR100561281B1 (en) * | 2001-08-27 | 2006-03-15 | 오므론 가부시키가이샤 | Image display apparatus and front right |
| KR20030055378A (en) * | 2001-12-24 | 2003-07-04 | 엘지.필립스 엘시디 주식회사 | The backlight unit of liquid crystal display |
| KR20030055377A (en) * | 2001-12-24 | 2003-07-04 | 엘지.필립스 엘시디 주식회사 | The backlight unit of liquid crystal display |
| KR100690504B1 (en) * | 2004-10-19 | 2007-03-09 | 주식회사 우영 | Light guide panel of back light unit, Upper main molding core for forming the light emitting surface of the light guide panel for back light unit, and method for manufacturing the light guide panel for back light unit |
| US8780300B2 (en) | 2005-06-24 | 2014-07-15 | Nlt Technologies, Ltd. | Optical member, light source apparatus, display apparatus, and terminal apparatus |
| JP2007003951A (en) * | 2005-06-24 | 2007-01-11 | Nec Corp | Optical member, light source device, display device and terminal device |
| US8848139B2 (en) | 2005-06-24 | 2014-09-30 | Nlt Technologies, Ltd. | Optical member, light source apparatus, display apparatus, and terminal apparatus |
| JP2012083458A (en) * | 2010-10-08 | 2012-04-26 | Seiko Epson Corp | Virtual image display device |
| US9223137B2 (en) | 2010-10-08 | 2015-12-29 | Seiko Epson Corporation | Virtual image display apparatus |
| US9784974B2 (en) | 2010-10-08 | 2017-10-10 | Seiko Epson Corporation | Virtual image display apparatus |
| TWI485476B (en) * | 2011-05-31 | 2015-05-21 | Mitsubishi Electric Corp | Backlight device and liquid crystal display device |
| WO2017164117A1 (en) * | 2016-03-24 | 2017-09-28 | シャープ株式会社 | Display device and head mounted display |
| US10895748B2 (en) | 2016-03-24 | 2021-01-19 | Sharp Kabushiki Kaisha | Display device including optical member including light refracting portion and head-mounted display including the same |
| WO2017177654A1 (en) * | 2016-04-11 | 2017-10-19 | 京东方科技集团股份有限公司 | Display device |
| US10698275B2 (en) | 2016-04-11 | 2020-06-30 | Boe Technology Group Co., Ltd. | Display apparatus |
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