【発明の詳細な説明】［産業上の利用分野］本発明は、透過型液晶表示装置に関するものである。更
に詳しくは、照明方法としてバックライト機構を持つ透
過型液晶表示装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a transmission type liquid crystal display device. More specifically, the present invention relates to a transmission type liquid crystal display device having a backlight mechanism as an illumination method.
［従来の技術及び問題点］液晶表示装置は薄型であり、陰極管（ブラウン管）を使
用するものに比較してコンパクトに組立られることから
、可搬型機器類の表示装置として広く用いられている。[Prior Art and Problems] Liquid crystal display devices are thin and can be assembled more compactly than those using cathode tubes (braun tubes), so they are widely used as display devices for portable equipment.
このような液晶表示装置は、近時バックライト機構を持
つものが多くなっているが、この機構は、通常液晶の背
面に複数個の冷陰極管と、光拡散板を配したもの、ある
いはエレクトロルミネッセンス（ＥＬ）面発行体による
ものなどが採用されている。Recently, many of these liquid crystal display devices have a backlight mechanism, but this mechanism usually consists of multiple cold cathode tubes and a light diffusion plate arranged on the back of the liquid crystal, or an electronic Luminescence (EL) surface issuers are used.
しかし、これらの照明方法では、それぞれ、発光体を発
光させるための励起電力を得る周波数コンバーターが必
要であり、この装置が液晶表示装置の一層のコンパクト
化の妨げとなることが多い。However, each of these lighting methods requires a frequency converter to obtain excitation power for causing the light emitter to emit light, and this device often becomes an obstacle to making the liquid crystal display device more compact.
又、特に冷陰極管を用いるものは、通常液晶パネルの背
面に光拡散板と共にこれらを可能な限り密に配置する必
要があり、管の交換が必要な際は極めて複雑で厄介な作
業が必要となる。In addition, especially for those that use cold cathode tubes, it is usually necessary to arrange them as densely as possible together with a light diffusion plate on the back of the LCD panel, which requires extremely complicated and troublesome work when the tubes need to be replaced. becomes.
一方、ＥＬ面発光体を用いるものは、上記のような複雑
で厄介な作業はある程度軽減されるが、寿命が比較的短
く、その上輝度は徐々に減衰するので同発光体の交換頻
度が大となるか、又は性能の落ちたものを無理をして使
い続けるなどの弊害が生ずる。On the other hand, those using EL surface light emitters reduce the complicated and troublesome work described above to some extent, but have a relatively short lifespan and, in addition, the brightness gradually decays, so the light emitters must be replaced more frequently. Otherwise, harmful effects may occur, such as forcing the user to continue using a product with degraded performance.
［問題を解決するための手段］本発明は、前記したように、通常用いられる点光源ラン
プと、該ランプより放射された光を集光して伝送する光
伝送体と、同伝送体により導かれた光を面発光形態に変
えて発光させる光散乱反射平面板を巧に組み合わせたも
ので、コンパクトで効率の良い液晶表示装置を提供する
ものである。[Means for Solving the Problem] As described above, the present invention provides a commonly used point light source lamp, an optical transmission body that collects and transmits light emitted from the lamp, and a light transmission body that transmits light emitted from the lamp. This is a clever combination of light-scattering and reflective flat plates that convert the emitted light into a surface-emitting form, and provides a compact and efficient liquid crystal display device.
即ち本発明は、バックライト方式液晶表示装置で、液晶
パネルの背面部に位置する透光性板の少なくとも一側面
端部を光入射部とし、かつ、該透光性板の液晶パネルと
の接近面と反対側の面に、前記光入射部から離れるに従
って光散乱物質を密に施し、更にその上面を鏡面反射板
で覆った、又は前記液晶パネルとの接近面と反対側の面
近傍に前記したと同様に光散乱物質を施した光散乱反射
板を配置した液晶表示装置に関するものである。次に本
発明を図面により詳述する。That is, the present invention provides a backlight type liquid crystal display device, in which at least one side edge of a translucent plate located on the back side of a liquid crystal panel is used as a light incident part, and the translucent plate is located close to the liquid crystal panel. A light-scattering material is applied to the surface opposite to the surface, increasing in density as the distance from the light incidence section increases, and the upper surface is further covered with a specular reflector, or the surface near the surface opposite to the surface approaching the liquid crystal panel is This invention relates to a liquid crystal display device in which a light scattering reflector plate coated with a light scattering material is arranged. Next, the present invention will be explained in detail with reference to the drawings.
第１図は本発明の一実施態様の斜視図であり、第２図は
同断面図である。FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a sectional view thereof.
同図中１は通常の液晶パネルであり、２は透光性板、３
は光伝送体部、４は光源部、５は導電線、６は液晶パネ
ルの電極、９は裏面反射板である。In the figure, 1 is a normal liquid crystal panel, 2 is a translucent plate, and 3 is a normal liquid crystal panel.
4 is a light transmitting body part, 4 is a light source part, 5 is a conductive wire, 6 is an electrode of a liquid crystal panel, and 9 is a back reflection plate.
液晶パネルの背面部に設置する透光性板は、光を透過さ
せる材質の物であれば良く、ガラス、石英、透光性の樹
脂類からなる。The translucent plate installed on the back side of the liquid crystal panel may be made of a material that transmits light, and is made of glass, quartz, or translucent resin.
本通光性板の背面（液晶パネル側と反対側の面）に、後
述の光散乱物質を、直接塗布、付着等の手段で施すか又
は、同物質を塗布、付着等の手段で施した光散乱反射平
面板を設置し、更にその表面に鏡面状の反射板を持つ裏
面反射板（図中９）を設置する。The light-scattering substance described below is applied directly to the back surface of the light-transmitting plate (the surface opposite to the liquid crystal panel side) by coating or adhering, or the same substance is applied by applying, adhering, etc. A light scattering and reflective flat plate is installed, and a back reflector (9 in the figure) having a mirror-like reflector on its surface is further installed.
本発明は、前記光散乱物質を透光性板又は光散乱反射板
に、光源部から離れるに従って密に施したことが特徴で
ある。The present invention is characterized in that the light-scattering material is applied to the light-transmitting plate or the light-scattering/reflecting plate in increasing density as the distance from the light source increases.
光散乱物質を施す際の形態は、第４図に示したように、
種々の形状によりその濃度差をもたせて行なう方法、塗
布回数に差を持たせて行なう方法等いずれの方法でも好
い。The form when applying the light scattering material is as shown in Figure 4.
Any method may be used, such as a method in which the concentration is varied depending on the shape of the coating, or a method in which the number of coatings is varied.
光伝送体部３は、光学透明円型ロッド（第２．３図７）
の一端又は両端に光源を持つもので、本円型ロッドを筒
状反射板８でその外周を覆ったものである。第３図は、
円型ロッドの一端に光源を持つ光伝送体の一実施態様を
示す断面図で、４は、光源部、例えば一般的には豆電球
を使用したもの、図中１０は、集光レンズ、１１は光を
反射する物質例えば凹面鏡で、これらは必ずしも必要で
ないが、光を効率良く利用する上でこれらを併用するこ
とは好ましい。図中７は光学透明円型ロッドであり、そ
の材質は、通常の光学透明物質例えばガラス、石英、ポ
リメチルメタクリレート、ポリカーボネート等である。The light transmission body part 3 is an optically transparent circular rod (Fig. 2.3 7)
It has a light source at one end or both ends, and the outer periphery of the circular rod is covered with a cylindrical reflecting plate 8. Figure 3 shows
This is a cross-sectional view showing an embodiment of a light transmitting body having a light source at one end of a circular rod, where 4 is a light source unit, for example, one that generally uses a miniature light bulb, 10 is a condensing lens, and 11 is a material that reflects light, such as a concave mirror, and although these are not necessarily required, it is preferable to use them together in order to utilize light efficiently. In the figure, reference numeral 7 denotes an optically transparent circular rod, and its material is a usual optically transparent material such as glass, quartz, polymethyl methacrylate, polycarbonate, etc.
８は筒状反射板で、空気層を介して円型ロッド７を覆っ
ている。8 is a cylindrical reflecting plate that covers the circular rod 7 with an air layer in between.
１２は光散乱物質であり、通常の白色度の高い顔料様物
質例えばチタンホワイト、酸化亜鉛、酸化カルシウム、
酸化バリウム、硫酸バリウム等が用いられる。12 is a light scattering substance, which is a pigment-like substance with a high degree of whiteness, such as titanium white, zinc oxide, calcium oxide,
Barium oxide, barium sulfate, etc. are used.
このものは、展着剤と混合して表面に塗布するか、テー
プ状に成形したものを付着させるかして施す。This can be applied by mixing it with a spreading agent and applying it to the surface, or by attaching it in the form of a tape.
この光散乱物質は、円型ロッドの透光性板に対する側の
略反対側に、光源部の端部を起点としてその長手方向に
略楔型に、即ち、光源部から離れるに従って順次その濃
度が密になるように配することが好ましい。The light-scattering substance is distributed on the opposite side of the circular rod to the light-transmitting plate in a substantially wedge-shaped longitudinal direction starting from the end of the light source, that is, its concentration increases gradually as it moves away from the light source. It is preferable to arrange them densely.
又、透光性板２の下面（液晶パネル接近面と反対側の面
）には、前記したと同様な光散乱物質を光入射部から離
れるに従って密に７なるように施す。Further, on the lower surface of the light-transmitting plate 2 (the surface opposite to the surface approaching the liquid crystal panel), the same light-scattering material as described above is applied so that it becomes denser as it moves away from the light incidence part.
これは、透光性板に直接施すこともできるが、前記した
と同様にして施した光散乱反射板を透光性板の下面に設
置することでも良い。Although this can be applied directly to the light-transmitting plate, it is also possible to install a light scattering and reflecting plate applied in the same manner as described above on the lower surface of the light-transmitting plate.
前記円型ロッド又は透光性板に於いて、複数個の光源部
を用いる場合も、光散乱物質は前記したと同様の構成、
即ち、光入射部から離れるに従って密になるように施す
。In the case where a plurality of light source parts are used in the circular rod or the transparent plate, the light scattering material has the same structure as described above,
That is, it is applied so that it becomes denser as it moves away from the light incidence part.
光散乱物質をこのように構成することにより、円型ロッ
ドに於いては、その長手方向に極めて光度分布の均一な
出射光を透光性板に、又透光性板に於いては同じく均一
な出射光を液晶パネル側に出射することが可能となる。By configuring the light scattering material in this way, in the case of a circular rod, the emitted light with an extremely uniform luminous intensity distribution in the longitudinal direction can be transmitted to the light-transmitting plate, and in the case of the light-transmitting plate, the emitted light can be uniformly distributed in the longitudinal direction. It becomes possible to emit the emitted light to the liquid crystal panel side.
このことは、光散乱物質を本発明のように構成せず、均
一な濃度で同物質を塗布した場合の輝度分布（図中β）
と、本発明のそれ（図中α）とを比較測定した結果を示
すチャート（第５図）からも朋らかである。This shows the brightness distribution (β in the figure) when the light scattering material is not configured as in the present invention and the same material is applied at a uniform concentration.
It is also clear from the chart (Fig. 5) showing the results of comparative measurements between this and that of the present invention (α in the figure).
′ＴＳ４図は、本発明の一実施態様の透光性板の下面又
は光散乱反射板に施こした光散乱物質の状態を示す概念
図である。Figure 'TS4 is a conceptual diagram showing the state of a light scattering substance applied to the lower surface of a light-transmitting plate or a light scattering/reflecting plate according to an embodiment of the present invention.
透光性板の、光入射部以外の側面には白色顔料用物質等
を塗布又は付着させ光を反射させることが好ましい。It is preferable that a white pigment material or the like be coated or adhered to the side surface of the translucent plate other than the light incident portion to reflect light.
［発明の効果］本発明は、液晶表示面に均一な光を照射することが出来
る。又光源の寿命が比較的長くしかも取替えが簡便であ
る。[Effects of the Invention] The present invention can irradiate a liquid crystal display surface with uniform light. Furthermore, the life of the light source is relatively long and replacement is easy.
更に装置全体が極めてコンパクトに構成できる。Furthermore, the entire device can be configured extremely compactly.
第１図は本発明の一実施態様の斜視図であり、第２図は
同断面図である。同図中１は通常の液晶パネルであり、２は透光性板、３
は光伝送体部、４は光源部、５は導電線、６は液晶パネ
ルの電極、７は円型ロッド、８は筒状反射板、９は裏面
反射板を夫々示す。第３図は、光源および光伝送体の一実施態様を示す断面
図で、４は光源部、例えば−船釣には豆電球を使用した
もの、図中１０は、集光レンズ、１１は光を反射する物
質を夫々示す。第４図は、本発明の一実施態様の透光性板の下面又は光
散乱反射板の光散乱物質の状態を示す概念図である。第
５図は光度分布比較チャートを示し、図中αは本発明に
よるもの、βは比較例の結果を夫々示す。FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a sectional view thereof. In the figure, 1 is a normal liquid crystal panel, 2 is a translucent plate, and 3 is a normal liquid crystal panel.
Reference numeral 4 indicates a light transmitting body, 4 a light source, 5 a conductive wire, 6 an electrode of a liquid crystal panel, 7 a circular rod, 8 a cylindrical reflector, and 9 a back reflector. FIG. 3 is a cross-sectional view showing an embodiment of a light source and a light transmitting body, where 4 is a light source unit, for example, a small light bulb is used for boat fishing, 10 is a condensing lens, and 11 is a light source unit. The substances that reflect are shown respectively. FIG. 4 is a conceptual diagram showing the state of the light-scattering substance on the lower surface of the translucent plate or the light-scattering/reflecting plate according to an embodiment of the present invention. FIG. 5 shows a light intensity distribution comparison chart, in which α indicates the result of the present invention and β indicates the result of the comparative example.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071889AJP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071889AJP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
| Publication Number | Publication Date |
|---|---|
| JPH01245220Atrue JPH01245220A (en) | 1989-09-29 |
| JP2891459B2 JP2891459B2 (en) | 1999-05-17 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63071889AExpired - Fee RelatedJP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
| Country | Link |
|---|---|
| JP (1) | JP2891459B2 (en) |
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|---|---|---|---|---|
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |