JP2891459B2 - Backlight - Google Patents
BacklightInfo
- Publication number
- JP2891459B2 JP2891459B2 JP63071889A JP7188988A JP2891459B2 JP 2891459 B2 JP2891459 B2 JP 2891459B2 JP 63071889 A JP63071889 A JP 63071889A JP 7188988 A JP7188988 A JP 7188988A JP 2891459 B2 JP2891459 B2 JP 2891459B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- plate
- liquid crystal
- transmitting plate
- denotes
- 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.)
- Expired - Fee Related
Links
Description
【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等の照明装置に関する
ものである。更に詳しくは、液晶表示装置等を背面から
照明するバックライトに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device such as a transmission type liquid crystal display device. More specifically, the present invention relates to a backlight for illuminating a liquid crystal display device or the like from behind.
［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。[Related Art and Problems] Liquid crystal display devices are widely used as display devices for portable devices because they are thin and can be assembled more compactly than those using a cathode ray tube (CRT).
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。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。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 recent years, many of such liquid crystal display devices have a backlight mechanism, and this mechanism is usually provided with a plurality of cold cathode tubes and a light diffusing plate on the back of the liquid crystal, or an electroluminescent device. Luminescence (EL) surface issuers are used. However, each of these illumination methods requires a frequency converter for obtaining excitation power for causing the light-emitting body to emit light, and this device often hinders further downsizing of the liquid crystal display device. In particular, in the case of using a cold-cathode tube, it is usually necessary to arrange them as densely as possible together with the light diffusion plate on the back of the liquid crystal panel, and when the tube needs to be replaced, extremely complicated and troublesome work is required. 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 the EL surface luminous body can reduce the complicated and troublesome work as described above to some extent, but have a relatively short life, and the luminance gradually decreases, so the luminous body needs to be replaced frequently. Or an adverse effect such as forcibly using a deteriorated device and continuing to use it.
［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バックライトを提供す
るものである。即ち本発明は、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バッ
クライトに関するものである。次に本発明を図面により
詳述する。[Means for Solving the Problem] As described above, the present invention relates to a point light source lamp which is generally used, an optical transmitter for condensing and transmitting light emitted from the lamp, and a light guide for the light source. It is a combination of a light-scattering / reflecting flat plate that emits light by changing the applied light into a surface-emitting form, and provides a compact and efficient backlight. That is, the present invention, at least one side edge of the light-transmitting plate located on the back surface of the liquid crystal panel is a light incident portion, and, on the surface opposite to the surface of the light-transmitting plate approaching the liquid crystal panel, As the distance from the light incident portion increases, the light scattering material is applied densely, and the upper surface is further covered with a specular reflection plate, or the light scattering material is applied in the vicinity of the surface opposite to the approach surface with the liquid crystal panel in the same manner as described above. The present invention relates to a backlight having a light scattering reflector provided thereon. Next, the present invention will be described 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 of the same.
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。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。In the figure, 1 is a normal liquid crystal panel, 2 is a translucent plate,
Reference numeral 3 denotes an optical transmission unit, 4 denotes a light source unit, 5 denotes a conductive line, 6 denotes an electrode of a liquid crystal panel, and 9 denotes a back reflector. The light-transmitting plate provided on the back of the liquid crystal panel may be made of a material that transmits light, and is made of glass, quartz, or a light-transmitting resin.
本透光性板の背面（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。On the back of this translucent plate (the surface opposite to the liquid crystal panel side)
A light scattering substance to be described later is applied by means of direct application, adhesion, or the like, or a light scattering reflection plane plate is applied by applying, attaching, or the like the same substance, and a mirror-like reflection plate is further provided on the surface thereof. A back reflector (9 in the figure) is provided.
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 substance is applied to a light-transmitting plate or a light-scattering reflection plate more densely as the distance from the light source unit 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。As shown in FIG. 4, the form in which the light scattering substance is applied may be any method such as a method of giving a difference in density between various shapes and a method of giving a difference in the number of times of application.
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。
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。The optical transmission unit 3 has a light source at one or both ends of an optically transparent circular rod (FIGS. 2 and 3), and is formed by covering the outer periphery of the circular rod with a cylindrical reflecting plate 8. . FIG. 3 is a cross-sectional view showing one embodiment of an optical transmission body having a light source at one end of a circular rod. Reference numeral 4 denotes a light source unit, for example, generally using a miniature bulb. The condenser lens 11 is a material that reflects light, for example, a concave mirror. These are not necessarily required, but it is preferable to use them together in order to use light efficiently. In the figure, reference numeral 7 denotes an optically transparent circular rod, the material of which is a usual optically transparent substance such as glass, quartz, polymethyl methacrylate, polycarbonate and the like.
Reference numeral 8 denotes a cylindrical reflecting plate, which covers the circular rod 7 via an air layer.
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。Reference numeral 12 denotes a light scattering substance, which is a pigment-like substance having a normal whiteness such as titanium white, zinc oxide, calcium oxide,
Barium oxide, barium sulfate or the like is 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。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。It is applied by mixing it with a spreading agent and applying it to the surface, or by attaching a tape-shaped one. The concentration of the light-scattering substance is substantially wedge-shaped in the longitudinal direction thereof, starting from the end of the light source section, on the side substantially opposite to the side of the circular rod with respect to the light-transmitting plate. 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なるように施す。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。On the lower surface of the translucent plate 2 (the surface opposite to the liquid crystal panel approach surface), the same light scattering substance as described above is applied so as to become denser as the distance from the light incident portion increases. This can be applied directly to the light-transmitting plate, but it is also possible to install a light-scattering reflector 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 sources are used in the circular rod or the translucent plate, the light scattering substance is applied in the same configuration as described above, that is, so as to become denser as the distance from the light incident part increases.
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 constructing the light-scattering substance in this way, in the case of a circular rod, the emitted light having a very uniform luminous intensity distribution in the longitudinal direction is transmitted to the light-transmitting plate, and the light-transmitting plate is also made uniform. It is possible to emit the outgoing 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）からも明らかである。This means that the light scattering material is not configured as in the present invention,
This is also evident from the chart (FIG. 5) showing the results of a comparative measurement of the luminance distribution (β in the figure) when the same substance was applied at a uniform concentration and that of the present invention (α in the figure).
第４図は、本発明の一実施態様の透光性板の下面又は
光散乱反射板に施こした光散乱物質の状態を示す概念図
である。FIG. 4 is a conceptual diagram showing a state of a light scattering substance applied to a lower surface of a light transmitting plate or a light scattering reflector according to one 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 to reflect or apply light by applying or attaching a white pigment substance or the like to the side surface of the translucent plate other than the light incident portion.
［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 the liquid crystal display surface with uniform light. Further, 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。 Further, the entire apparatus can be configured to be extremely compact.
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 of the same. In the figure, 1 is a normal liquid crystal panel, 2 is a translucent plate, 3
Denotes an optical transmission unit, 4 denotes a light source unit, 5 denotes a conductive wire, 6 denotes an electrode of a liquid crystal panel, 7 denotes a circular rod, 8 denotes a cylindrical reflector, and 9 denotes a back reflector. FIG. 3 is a cross-sectional view showing one embodiment of a light source and an optical transmission body. Reference numeral 4 denotes a light source unit, for example, generally using a miniature bulb. In the drawing, reference numeral 10 denotes a condenser lens, and reference numeral 11 denotes light. Each of the reflective materials is shown. FIG. 4 is a conceptual diagram showing a state of a light scattering substance on a lower surface of a light transmitting plate or a light scattering reflector according to an embodiment of the present invention. FIG. 5 shows a luminous intensity distribution comparison chart, in which α represents the result of the present invention and β represents the result of the comparative example.
フロントページの続き 合議体 審判長 桜井 義宏 審判官 豊岡 静男 審判官 橋本 栄和 (56)参考文献 特開 昭59−81683（ＪＰ，Ａ) 実開 昭61−145979（ＪＰ，Ｕ) 実開 昭62−179737（ＪＰ，Ｕ)Continuation of the front page Judge, Yoshihiro Sakurai Judge, Shizuo Toyooka Judge, Eika Hashimoto (56) References JP-A-59-81683 (JP, A) 179737 (JP, U)
Claims (1)
晶パネルとの接近面と反対側の面に、前記一側面端部に
平行な方向においては実質的に密度が一定であり、前記
一側面端部に直交する方向においては前記光入射部から
離れるに従って実質的に密度が高くなるように光散乱物
質を施し、その面を鏡面反射板で被覆した透光性板と、
光入射部近傍に配置した反射鏡機構を持つ光伝送体と、
該光伝送体の一端に配置した点光源発光体とを有するバ
ックライトであって、前記光伝送体が、透光性板に対す
る側と反対側に光散乱物質を前記点光源発光体から離れ
るに従って密に施した光学透明物質で形成された円形ロ
ッドからなり、その外周を空気層を介して反射板で筒状
に覆い、透光性板の側面側に光出口を設けたものである
バックライト。1. A light incident portion at one side end of a light-transmitting plate, and a density substantially constant in a direction parallel to the one side end on a surface opposite to a surface approaching a liquid crystal panel. In a direction orthogonal to the one side edge, a light-scattering material is applied so that the density becomes substantially higher as the distance from the light incident portion increases, and a light-transmitting plate whose surface is covered with a specular reflection plate is provided. ,
An optical transmitter having a reflecting mirror mechanism arranged near the light incident part,
A backlight having a point light source disposed at one end of the light transmitter, wherein the light transmitter separates the light scattering material from the point light source to a side opposite to a side with respect to the light transmitting plate. A backlight consisting of a circular rod made of a dense optically transparent substance, whose outer periphery is cylindrically covered with a reflector through an air layer, and provided with a light outlet on the side surface of the translucent plate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071889A JP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071889A JP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01245220A JPH01245220A (en) | 1989-09-29 |
| JP2891459B2 true JP2891459B2 (en) | 1999-05-17 |
Family
ID=13473555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63071889A Expired - Fee Related JP2891459B2 (en) | 1988-03-28 | 1988-03-28 | Backlight |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2891459B2 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5283673A (en) * | 1989-09-30 | 1994-02-01 | Kabushiki Kaisha Meitaku Shisutemu | Surface luminous source panel with areas having different reflector speck densities |
| JPH0776817B2 (en) * | 1990-08-15 | 1995-08-16 | 茶谷産業株式会社 | Planar liquid crystal display |
| EP0500960B1 (en) * | 1990-09-12 | 1995-12-20 | Mitsubishi Rayon Co., Ltd. | Element of plane source of light |
| JP2710465B2 (en) * | 1990-09-12 | 1998-02-10 | 三菱レイヨン株式会社 | Surface light source element |
| EP0506116B1 (en) * | 1991-03-29 | 1996-01-31 | Nissha Printing Co., Ltd. | Surface light source device |
| CA2071454A1 (en) * | 1991-06-21 | 1992-12-22 | Seiji Tone | Method for preparing graft copolymer |
| JP3030792B2 (en) * | 1991-09-27 | 2000-04-10 | 東ソー株式会社 | Backlight |
| JP2533024B2 (en) * | 1991-10-30 | 1996-09-11 | 株式会社明拓システム | Incident light supply device for edge light panel |
| CA2099067C (en) * | 1993-06-23 | 2001-02-13 | Makoto Oe | Plane light source unit |
| US5863113A (en) * | 1993-06-22 | 1999-01-26 | Mitsubishi Rayon Co., Ltd. | Plane light source unit |
| JP2742880B2 (en) * | 1994-08-12 | 1998-04-22 | 大日本印刷株式会社 | Surface light source, display device using the same, and light diffusion sheet used for them |
| EP1231501A3 (en) * | 1995-12-05 | 2004-01-21 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display device |
| CN1078335C (en) * | 1996-02-01 | 2002-01-23 | 三菱丽阳株式会社 | Surface light source element and liquid crystal device and sign display device using same |
| TW523627B (en) | 1998-07-14 | 2003-03-11 | Hitachi Ltd | Liquid crystal display device |
| JP4904599B2 (en) * | 2008-07-25 | 2012-03-28 | 住友電工プリントサーキット株式会社 | Wiring module and electronic equipment |
| TWI370273B (en) * | 2008-10-17 | 2012-08-11 | Coretronic Corp | Light guide plate |
| JP2012106811A (en) * | 2010-11-15 | 2012-06-07 | Fujitec Co Ltd | Panel for elevator or the like |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5981683A (en) * | 1982-11-02 | 1984-05-11 | 株式会社東芝 | Liquid crystal display |
| JPS61145979U (en) * | 1985-03-01 | 1986-09-09 | ||
| JPS62179737U (en) * | 1986-05-06 | 1987-11-14 |
-
1988
- 1988-03-28 JP JP63071889A patent/JP2891459B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01245220A (en) | 1989-09-29 |
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