JPH05264995A - Back light for panel - Google Patents
Back light for panelInfo
- Publication number
- JPH05264995A JPH05264995A JP4125329A JP12532992A JPH05264995A JP H05264995 A JPH05264995 A JP H05264995A JP 4125329 A JP4125329 A JP 4125329A JP 12532992 A JP12532992 A JP 12532992A JP H05264995 A JPH05264995 A JP H05264995A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- liquid crystal
- tubular
- light
- guide plate
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、液晶表示装置などの
面発光の表示装置の背面よりこれを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 back light for a panel which illuminates a surface emitting display device such as a liquid crystal display device from the back side thereof.
【０００２】[0002]
【従来の技術】近年、ワードプロセッサーやパーソナル
コンピュータ等の表示装置に透過型或いは半透過型の液
晶表示装置が多用されており、このような液晶表示装置
では、通常、液晶表示板の背面に照明が配設されてい
る。そして、この背面の照明として、以前は例えば電球
等が利用されてきたが、最近は蛍光灯や冷陰極放電管等
の放電型のものが使用されている。2. Description of the Related Art In recent years, a transmissive or semi-transmissive liquid crystal display device has been widely used for a display device such as a word processor or a personal computer. In such a liquid crystal display device, illumination is usually provided on the back surface of a liquid crystal display plate. It is arranged. For example, a light bulb has been used as the illumination on the back surface in the past, but recently, a discharge type such as a fluorescent lamp or a cold cathode discharge tube has been used.
【０００３】液晶表示装置の照明方法としては、一般に
液晶表示板の背面直下に光源を配設する方法と、液晶表
示部の直下に光源を配設せずに、液晶表示部の側面方向
に光源を配設し、アクリル等の導光板を用いて面状発光
照明を作り出す方法（サイドライト方式）が知られてい
る。ここでこのサイドライト方式については、例えば特
開昭61−99187 号公報や特開昭63−62104 号公報に記載
されている。As a method for illuminating a liquid crystal display device, generally, a light source is arranged directly below the back surface of the liquid crystal display plate, or a light source is not arranged directly below the liquid crystal display portion, and the light source is arranged in the lateral direction of the liquid crystal display portion. There is known a method (sidelight method) in which a planar light emitting illumination is created by using a light guide plate made of acrylic or the like. The sidelight system is described in, for example, Japanese Patent Laid-Open Nos. 61-99187 and 63-62104.
【０００４】ところでこのような放電型の照明光源は、
一般に管状をしており、その管端部は、放電型の照明光
源の特徴として放電電極が配設されているために、また
発光部においても管中央部に比べて端部は発光輝度が低
くなることが通常である。By the way, such a discharge type illumination light source is
Generally, it has a tubular shape, and because the discharge electrode is arranged at the end of the tube as a feature of the discharge type illumination light source, the emission brightness at the end of the light emitting section is lower than that at the center of the tube. Is usually the case.
【０００５】従って、従来、管端部の発光輝度が低い部
分は、面発光の光源として使用されていないのが実情で
ある。Therefore, conventionally, the part of the tube end where the emission brightness is low is not used as a surface emitting light source.
【０００６】[0006]
【発明が解決しようとする課題】図２は従来の液晶表示
装置の一例を示す平面図である。同図において、例えば
冷陰極管からなる光源１の発光部１ａに例えば方形状ア
クリルからなる導光板２の光導入端部２ａを隣接して配
置し、光源１からの光で液晶表示板３を照射する構造に
なっている。ここで導光板２には、例えば特開昭63−62
105 号公報に記載されているように、一端側から他端側
にいくにつれてその被覆率（反射率）が高くなるよう
に、乳白色印刷（図示せず）が施されている。また、導
光板２における光導入端部２ａの長さは、光源１の発光
部１ａの長さとほぼ同じ、即ち光源１の長さより短く、
光源１の非発光部１ｂが略方形状よりはみ出している。FIG. 2 is a plan view showing an example of a conventional liquid crystal display device. In the figure, a light-introducing end portion 2a of a light guide plate 2 made of, for example, a square acrylic is arranged adjacent to a light emitting portion 1a of a light source 1 made of, for example, a cold cathode tube, and the liquid crystal display plate 3 is irradiated with light from the light source 1. It is structured to irradiate. Here, the light guide plate 2 includes, for example, Japanese Patent Laid-Open No. 63-62.
As described in Japanese Patent Publication No. 105, the milk white printing (not shown) is performed so that the coverage (reflectance) increases from one end side to the other end side. Further, the length of the light introducing end portion 2a of the light guide plate 2 is substantially the same as the length of the light emitting portion 1a of the light source 1, that is, shorter than the length of the light source 1,
The non-light emitting portion 1b of the light source 1 protrudes from the substantially rectangular shape.
【０００７】そして、このはみ出た部分はモジュールカ
バー４により規定される製品外形を著しく制限する要因
となるため、光源１は面発光照明の略方形内に納めるこ
とが望ましいとされている。Since the protruding portion significantly restricts the outer shape of the product defined by the module cover 4, it is desirable that the light source 1 be housed in a substantially rectangular shape of the surface emitting illumination.
【０００８】図３は従来の液晶表示装置の他の例を示す
平面図であり、図２と対応する部分には同一の符号を付
してある。同図から分かるように、導光板２の形状を光
導入端部２ａのみ光源１の発光部１ａと同じ長さにし
て、ここから楔状に広げるようにすることにより、製品
外形を略方形内に納めることが可能になる。FIG. 3 is a plan view showing another example of the conventional liquid crystal display device, and the portions corresponding to those in FIG. 2 are designated by the same reference numerals. As can be seen from the figure, the shape of the light guide plate 2 has the same length as that of the light emitting portion 1a of the light source 1 only in the light introducing end portion 2a, and the light guide portion 2 is spread in a wedge shape from here, thereby making the outer shape of the product substantially rectangular. It becomes possible to pay.
【０００９】しかしながら、背面照明に使用できない楔
状の部分の存在により、製品外形が図２の場合に比べて
大きくならざるを得ず，また、導光板２の加工コストも
高くなる。However, due to the presence of the wedge-shaped portion that cannot be used for the back lighting, the outer shape of the product is inevitably larger than that in the case of FIG. 2, and the processing cost of the light guide plate 2 is also increased.
【００１０】この発明はこのような従来の事情に鑑みな
されたものである。The present invention has been made in view of such conventional circumstances.
【００１１】[0011]
【課題を解決するための手段】この発明は、液晶表示装
置等の面発光の表示装置の背面よりこれを照射するパネ
ル用バックライトについてのものであり、透光性材料か
らなる導光板の少なくとも一側面端部に、これに近接し
て管状光源を持つパネル用バックライトにおいて、導光
板面状に形成した反射パターンの反射率が、管状光源側
から遠ざかるに従って、及び導光板の、管状光源の中央
部近傍からその端部方向に遠ざかるに従って、管状光源
側の中央部近傍の反射率より大となるように反射パター
ンを形成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。SUMMARY OF THE INVENTION The present invention relates to a panel backlight for illuminating a surface emitting display device such as a liquid crystal display device from the back side thereof, and at least a light guide plate made of a translucent material. In a backlight for a panel having a tubular light source in the vicinity of one side end portion thereof, the reflectance of the reflection pattern formed on the surface of the light guide plate increases as the distance from the tubular light source side increases, and the light guide plate's The present invention relates to a backlight for a panel, wherein a reflection pattern is formed so as to have a reflectance higher than that in the vicinity of the central portion on the tubular light source side as the distance from the vicinity of the central portion increases in the direction of the end portion.
【００１２】[0012]
【作用】図１(a) は表示装置の表示側からみたときの概
略平面図、同(b) は、図１(a)のＡ−Ａ’面を矢印方向
から見た時の概略平面図である。1 (a) is a schematic plan view when viewed from the display side of the display device, and FIG. 1 (b) is a schematic plan view when the AA 'plane of FIG. 1 (a) is viewed from the arrow direction. Is.
【００１３】図１(a)(b)において、例えばガラスからな
る第１及び第２基板10，11の一主面上には、例えばＩＴ
Ｏ（インジウム・チン・オキサイド）からなる電極12，
13が形成され、更にこれを覆うように、例えばポリイミ
ドからなる配向膜14，15が形成されている。そして、第
１及び第２基板10，11の一方例えば第１基板10の一主面
上には、液晶注入口となるべき部分を空けた枠状に、例
えば熱硬化型のエポキシ樹脂からなる接着剤16を印刷
し、第１及び第２基板10，11の他方例えば第２基板11の
一面上には、例えばガラスファイバーからなるスペーサ
ー17を散布する。In FIGS. 1A and 1B, for example, IT is formed on one main surface of the first and second substrates 10 and 11 made of glass, for example.
Electrode 12 made of O (indium, tin, oxide),
13 is formed, and further, alignment films 14 and 15 made of, for example, polyimide are formed so as to cover the same. Then, on one of the first and second substrates 10 and 11, for example, on one main surface of the first substrate 10, a frame-shaped structure in which a portion to be a liquid crystal injection port is formed, for example, adhesive made of thermosetting epoxy resin The agent 16 is printed, and spacers 17 made of, for example, glass fibers are scattered on the other surface of the first and second substrates 10 and 11, for example, one surface of the second substrate 11.
【００１４】続いて、互いの一主面側が対向するよう
に、第１及び第２基板10，11を組み合わせた後、液晶注
入口より液晶18を注入することにより、第１及び第２基
板10，11間の間隙に液晶18を挟持させる。そして、液晶
注入口を封止することによって、所定の液晶表示板19が
得られる。続いて第１及び第２基板10，11の他主面側に
偏光板20を被着させる。Subsequently, the first and second substrates 10 and 11 are combined so that their main surfaces are opposed to each other, and then the liquid crystal 18 is injected from the liquid crystal injection port to thereby inject the first and second substrates 10 and 11. The liquid crystal 18 is clamped in the gap between 11 and 11. Then, the predetermined liquid crystal display plate 19 is obtained by sealing the liquid crystal injection port. Subsequently, the polarizing plate 20 is attached to the other main surface side of the first and second substrates 10 and 11.
【００１５】また、第１基板11の他主面側には、液晶駆
動回路基板21が配置されており、液晶表示板19と液晶駆
動回路基板21は例えばフレキシブルケーブル等の接続手
段22により、電気的に接続されている。そして、液晶表
示板19と液晶駆動回路基板21の間には、例えばアクリル
板からなる導光板23が配置され、この導光板23の光導入
端部23ａに近接して例えば冷陰極管からなる放電型の管
状光源24が設けられている。A liquid crystal drive circuit board 21 is arranged on the other main surface side of the first substrate 11, and the liquid crystal display board 19 and the liquid crystal drive circuit board 21 are electrically connected by a connecting means 22 such as a flexible cable. Connected to each other. A light guide plate 23 made of, for example, an acrylic plate is disposed between the liquid crystal display plate 19 and the liquid crystal drive circuit board 21, and a light discharge plate made of, for example, a cold cathode tube is disposed in proximity to the light introducing end 23a of the light guide plate 23. A tubular light source 24 of the mold is provided.
【００１６】また、この例では、光導入端部23ａと平行
な方向における有効発光部の長さＬを、管状光源24の長
さ１以上例えばＬ＞１としたものを用いた。導光板23に
おける液晶駆動回路基板21と対向する側の面には、反射
パターン25が例えば乳白色印刷により形成されている。
この反射パターン25は、図１(c) に示すように、管状光
源24の発光部24ａの中央部近傍では管軸の非発光部24ｂ
近傍に比べ、個々の反射パターン25の面積を大きくし，
また、全体としては、管状光源24から離れるに従って、
個々の反射パターン25の面積は大きくなるようにしてい
る。Further, in this example, the length L of the effective light emitting portion in the direction parallel to the light introducing end portion 23a is set to be equal to or longer than the length of the tubular light source 24, for example, L> 1. A reflection pattern 25 is formed on the surface of the light guide plate 23 facing the liquid crystal drive circuit board 21 by, for example, milk white printing.
As shown in FIG. 1 (c), this reflection pattern 25 is provided in the vicinity of the central portion of the light emitting portion 24a of the tubular light source 24 in the non-light emitting portion 24b of the tube axis.
The area of each reflection pattern 25 is increased compared to the vicinity,
In addition, as a whole, as it goes away from the tubular light source 24,
The area of each reflection pattern 25 is made large.
【００１７】この発明の特徴は図１(c) に示したよう
に、導光板23の一方の面に、反射パターン25を、ある状
態となるように形成したことにある。即ち、導光板に形
成する反射パターンの形状を、管状光源側からこれにほ
ぼ垂直方向に遠ざかるに従って反射律率を上げるよう
に，及び管状光源の管中央の発光部近傍に比べ、管状光
源の管端部近傍の反射率を上げるように形成したことで
ある。A feature of the present invention is that the reflection pattern 25 is formed on one surface of the light guide plate 23 so as to be in a certain state, as shown in FIG. 1 (c). That is, the shape of the reflection pattern formed on the light guide plate should be increased as the distance from the tubular light source is increased in a direction substantially perpendicular to the reflection pattern, and the shape of the tubular light source should be higher than that near the light emitting part in the center of the tubular light source. That is, it is formed so as to increase the reflectance near the edges.
【００１８】このような構成とすることにより、前記し
たように、例えばこれを液晶表示装置のバックライトと
して用いる際において、バックライトの管状光源に、そ
の端部の非発光部を含めた長さが、それと近接する導光
板の端部長さと略同じものを用いても，また、発光部の
両端の明るさが中央部に比較して低い管状光源を用いて
も、管状光源の明るさの不均一による、表示板面の輝度
の不均一が発生せず、製品外形を略方形内に納めること
も可能になる。With such a structure, as described above, for example, when this is used as a backlight of a liquid crystal display device, the tubular light source of the backlight has a length including a non-light emitting portion at its end. However, the brightness of the tubular light source does not vary even if the length of the end of the light guide plate adjacent to it is approximately the same, or if the brightness of both ends of the light emitting part is lower than that of the central part. The uniformity of the brightness of the display plate surface does not occur due to the uniformity, and it becomes possible to fit the outer shape of the product in a substantially rectangular shape.
【００１９】この反射パターン25の夫々の形状は特に限
定されないが、図１(c) に示したようにドット状（網点
状）又は水滴状が一般的である。又、本発明で限定した
状態に反射パターンを形成すると、面積の等しい（即ち
反射率の等しい）パターンを結ぶ線で形成される形状
は、管状光源と近接する導光板の端部辺を底辺とする山
形となることが同図からも分かる。又、反射パターンの
形成は、例えば乳白色物質等を用いて印刷などの手段で
行うことができる。つまりパターンの部分が導光板の持
つ屈折率と異なる屈折率を持つ状態とすることである。The shape of each of the reflection patterns 25 is not particularly limited, but is generally dot-like (dot-like) or water-drop-like as shown in FIG. 1 (c). Further, when the reflection pattern is formed in the state limited by the present invention, the shape formed by the lines connecting the patterns having the same area (that is, having the same reflectance) has the end side of the light guide plate close to the tubular light source as the bottom side. It can be seen from the figure that it becomes a mountain shape that does. The reflection pattern can be formed by a means such as printing using a milky white substance or the like. That is, the pattern portion has a refractive index different from that of the light guide plate.
【００２０】この発明で用いる導光板は、透光性材料か
らなる例えばアクリル樹脂の薄板などが用いられ、その
大きさは、このものがバックライトとして用いられる対
象物の表示面の大きさにほぼ相当する面を持つ大きさで
ある。The light guide plate used in the present invention is made of a translucent material, for example, a thin plate of acrylic resin, and its size is approximately the same as the size of the display surface of an object used as a backlight. It is a size with a corresponding surface.
【００２１】又、導光板の少なくとも一側面端部に、こ
れに近接して配設する管状光源は、通常の冷陰極管など
が用いられる。Further, as the tubular light source disposed at the end portion of at least one side surface of the light guide plate in the vicinity thereof, an ordinary cold cathode tube or the like is used.
【００２２】[0022]
【実施例】以下、この発明の詳細を、この発明を用いた
液晶表示装置を参考に図面を参照して説明する。図１
(c) はこの発明の一実施例を示す概略図であり、この発
明の導光板における管状光源側の中央部近傍からその端
部近傍にかけての印刷パターン（反射パターン）を示す
概略図である。図１(a) は、本発明を用いた液晶23及び
管状光源24はモジュールカバー26により一体化され、所
定の液晶表示装置が構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings with reference to a liquid crystal display device using the present invention. Figure 1
(c) is a schematic view showing an embodiment of the present invention, and is a schematic view showing a printing pattern (reflection pattern) from the vicinity of the central portion of the light guide plate of the present invention on the tubular light source side to the vicinity of the end portions thereof. In FIG. 1A, a liquid crystal 23 and a tubular light source 24 according to the present invention are integrated by a module cover 26 to form a predetermined liquid crystal display device.
【００２３】この実施例では、導光板23には管状光源24
の端部近傍の反射率を発光部24ａの中央部近傍の反射率
に比べて高くするように、所定の反射パターン25が形成
されているため、光導入端部23ａと平行な方向における
有効発光部の長さを管状光源24の長さと同等にした場合
にも、非発光部24ｂ近傍が発光部24ａ近傍に比べて暗く
なるのを防止できる。従って、液晶表示装置の外形を略
方形内に納めることが可能になる。また、個々の反射パ
ターン25の形状を管状光源24からの距離によって変化さ
せることにより、パターンの印刷精度のばらつきとモア
レにより稿を防ぐなどして均一な輝度を得る。In this embodiment, the light guide plate 23 has a tubular light source 24.
Since a predetermined reflection pattern 25 is formed so that the reflectance in the vicinity of the end portion of the light emitting portion 24a is higher than the reflectance in the vicinity of the central portion of the light emitting portion 24a, effective light emission in the direction parallel to the light introducing end portion 23a. Even when the length of the portion is made equal to that of the tubular light source 24, it is possible to prevent the vicinity of the non-light emitting portion 24b from becoming darker than the vicinity of the light emitting portion 24a. Therefore, it is possible to fit the outer shape of the liquid crystal display device into a substantially rectangular shape. Further, by changing the shape of each reflection pattern 25 according to the distance from the tubular light source 24, uniform brightness can be obtained by preventing printing due to variations in pattern printing accuracy and moire.
【００２４】なお、今までは、液晶表示板が一層セル構
造である場合について述べたが、これは２層以上の多層
セル構造であってもよいことは言うまでもない。It has been described above that the liquid crystal display panel has a single-layer cell structure, but it goes without saying that it may have a multi-layer cell structure of two or more layers.
【００２５】[0025]
【発明の効果】この発明は、導光板に、管状光源の両端
部近傍の反射率を発光部中央近傍の反射率に比べて高く
するように反射パターンを形成したことにより、これを
用いた面表示装置は均一な面発光が可能となる。According to the present invention, a reflection pattern is formed on the light guide plate so that the reflectance near both ends of the tubular light source is higher than the reflectance near the center of the light emitting portion. The display device enables uniform surface emission.
【図１】図１は、この発明の一実施態様(c) 及びこれを
用いた液晶表示装置(a)(b)の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment (c) of the present invention and liquid crystal display devices (a) and (b) using the same.
【図２】図２は、従来の液晶表示装置の一例を示す概略
構成図である。FIG. 2 is a schematic configuration diagram showing an example of a conventional liquid crystal display device.
【図３】図３は、従来の液晶表示装置の他の例を示す概
略構成図である。FIG. 3 is a schematic configuration diagram showing another example of a conventional liquid crystal display device.
10…第１基板 11…第２基板 12，13…電極 18…液晶 19…液晶表示器 23…導光板 24…管状光源 25…反射パターン 10 ... First substrate 11 ... Second substrate 12, 13 ... Electrode 18 ... Liquid crystal 19 ... Liquid crystal display 23 ... Light guide plate 24 ... Tubular light source 25 ... Reflection pattern
Claims (1)
一側面端部に、これに近接して管状光源を持つパネル用
バックライトにおいて、前記導光板面上に形成した反射
パターンの反射率が、前記管状光源側から遠ざかるに従
って，及び前記導光板の、管状光源の中央部近傍からそ
の端部方向に遠ざかるに従って、前記管状光源側の中央
部近傍の反射率より大となるように反射パターンを形成
したことを特徴とするパネル用バックライト。1. In a backlight for a panel, which has a tubular light source adjacent to at least one side end of a light guide plate made of a translucent material, the reflectance of a reflection pattern formed on the light guide plate surface is As the distance from the tubular light source side increases, and as the light guide plate moves away from the central portion of the tubular light source in the direction of its end, a reflection pattern is formed so that the reflectance is higher than the reflectance in the central portion of the tubular light source side. A backlight for a panel characterized by being formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4125329A JPH05264995A (en) | 1992-04-20 | 1992-04-20 | Back light for panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4125329A JPH05264995A (en) | 1992-04-20 | 1992-04-20 | Back light for panel |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1221733A Division JP2573365B2 (en) | 1989-08-30 | 1989-08-30 | Liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05264995A true JPH05264995A (en) | 1993-10-15 |
Family
ID=14907420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4125329A Pending JPH05264995A (en) | 1992-04-20 | 1992-04-20 | Back light for panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05264995A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751386A (en) * | 1994-12-16 | 1998-05-12 | Canon Kabushiki Kaisha | Illumination device with luminance distribution adjusting reflection plate and liquid crystal display apparatus including same |
| JP2001343532A (en) * | 2000-03-31 | 2001-12-14 | Mitsubishi Electric Corp | Front-light, reflective liquid crystal display device and portable information terminal |
| US6636283B2 (en) | 2000-03-31 | 2003-10-21 | Mitsubishi Denki Kabushiki Kaisha | Front light, reflective liquid crystal display device and personal digital assistant |
| US7050129B2 (en) | 2003-09-06 | 2006-05-23 | Hyundai Mobis Co., Ltd. | Liquid crystal display module of car audio |
| US7057679B2 (en) | 2003-09-06 | 2006-06-06 | Hyundai Mobis Co., Ltd. | Light guide plate for liquid crystal display module of car audio in use with the light guide plate |
-
1992
- 1992-04-20 JP JP4125329A patent/JPH05264995A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751386A (en) * | 1994-12-16 | 1998-05-12 | Canon Kabushiki Kaisha | Illumination device with luminance distribution adjusting reflection plate and liquid crystal display apparatus including same |
| JP2001343532A (en) * | 2000-03-31 | 2001-12-14 | Mitsubishi Electric Corp | Front-light, reflective liquid crystal display device and portable information terminal |
| US6636283B2 (en) | 2000-03-31 | 2003-10-21 | Mitsubishi Denki Kabushiki Kaisha | Front light, reflective liquid crystal display device and personal digital assistant |
| US7050129B2 (en) | 2003-09-06 | 2006-05-23 | Hyundai Mobis Co., Ltd. | Liquid crystal display module of car audio |
| US7057679B2 (en) | 2003-09-06 | 2006-06-06 | Hyundai Mobis Co., Ltd. | Light guide plate for liquid crystal display module of car audio in use with the light guide plate |
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