JP2573365B2 - Liquid crystal display - Google Patents
Liquid crystal displayInfo
- Publication number
- JP2573365B2 JP2573365B2 JP1221733A JP22173389A JP2573365B2 JP 2573365 B2 JP2573365 B2 JP 2573365B2 JP 1221733 A JP1221733 A JP 1221733A JP 22173389 A JP22173389 A JP 22173389A JP 2573365 B2 JP2573365 B2 JP 2573365B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- crystal display
- guide plate
- display device
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） この発明は背面に面状発光照明を備え、その面状発光
照明に導光板を用いた液晶表示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a liquid crystal display device provided with a planar light emitting illumination on the back surface and using a light guide plate for the planar light emitting illumination.
（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。(Prior Art) In recent years, transmissive or transflective liquid crystal display devices have been frequently used in display devices such as word processors and personal computers.
Lighting is provided on the back of the liquid crystal display panel. For example, a light bulb or the like has been used as the backside illumination, but a discharge type such as a fluorescent lamp or a cold cathode discharge tube has recently been used.
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号公報等に記載されている。Illumination methods include generally disposing a light source directly below the back of the liquid crystal display panel, and disposing a light source in the side direction of the liquid crystal display unit without disposing the light source immediately below the liquid crystal display unit, and using acrylic or the like. There is known a method (side light method) for producing a planar light-emitting illumination using the light guide plate described above. Here, this sidelight system is described in, for example, JP-A-61-99187 and JP-A-63-62104.
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、管中央部に比べ発
光輝度が極端に低い。従って従来、管端部の発光輝度が
極端に低い部分は、面発光の光源として使用されていな
い。By the way, such a discharge-type illumination light source is generally tubular, and the discharge end is provided with a discharge electrode as a characteristic of the discharge-type illumination light source. Extremely low. Therefore, conventionally, the portion where the emission luminance at the end of the tube is extremely low has not been used as a light source for surface emission.
（発明が解決しようとする課題） 第２図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63−62105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濃度（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
み出ている。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。(Problems to be Solved by the Invention) FIG. 2 is a plan view showing an example of a conventional liquid crystal display device. In FIG. 1, for example, a light introducing end 2a of a light guide plate 2 made of, for example, rectangular acryl is disposed adjacent to a light emitting portion 1a of a light source 1 made of a cold cathode tube, and light from the light source 1 is used. Is irradiated. Here, the light guide plate 2
For example, as described in JP-A-63-62105, milky white printing (not shown) is performed such that the density (reflectance) increases from one end to the other end. Have been. The length of the light introducing end 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, ie,
, The non-light emitting portion 1b of the light source 1 protrudes from a substantially rectangular shape. 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 accommodated in a substantially square shape of the surface emitting illumination.
第３図は従来の液晶表示装置の他の例を示す平面図で
あり、第２図と対応する部分には同一の符号を付してあ
る。同図からわかるように、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。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、製品外形が第
２図の場合に比べ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。FIG. 3 is a plan view showing another example of the conventional liquid crystal display device, and portions corresponding to FIG. 2 are denoted by the same reference numerals. As can be seen from the figure, the shape of the light guide plate 2 is the same length as the light emitting portion 1a of the light source 1 only at the light introduction end 2a and is spread in a wedge shape from here, so that the outer shape of the product is substantially rectangular. It becomes possible to put it. However, due to the presence of a wedge-shaped portion that cannot be used for backlighting, the product outer shape must be larger than in the case of FIG. 2, and the processing cost of the light guide plate 2 also increases.
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.
［発明の構成］ （課題を解決するための手段） この発明は、一主面上に電極が形成された第１及び第
２基板を互いの一主面側が対向するように組み合わせ、
前記第１及び第２基板間の間隙に液晶を挟持してなる液
晶表示板と、前記第１基板の他主面側に配置され，少な
くとも一端を光導入端部としてなる導光板と、前記導光
板の前記光導入端部に近接し前記光導入端部と略平行し
て配置され，各管端に非発光部と，前記非発光部に挟ま
れ前記導光板の前記光導入端部に光を導く発光部とを有
する放電型の管状光源とを備えた液晶表示装置について
のものであり、前記管状光源の前記発光部の長さは前記
発光部に近接した前記光導入端部の長さよりも短く、且
つ前記導光板には前記管状光源の前記非発光部近傍の反
射率を前記発光部近傍の反射率に比べて高くするように
反射パターンが配置されている。[Configuration of the Invention] (Means for Solving the Problems) According to the present invention, a first and a second substrate having electrodes formed on one main surface are combined so that one main surface side faces each other,
A liquid crystal display panel having a liquid crystal sandwiched in a gap between the first and second substrates; a light guide plate disposed on the other main surface side of the first substrate and having at least one end serving as a light introducing end; The light guide plate is disposed adjacent to and substantially parallel to the light introduction end of the light plate, and a non-light-emitting portion is provided at each tube end, and light is applied to the light introduction end of the light guide plate sandwiched between the non-light-emitting portions. And a discharge-type tubular light source having a light-emitting portion for guiding the light-emitting portion, wherein the length of the light-emitting portion of the tubular light source is longer than the length of the light introducing end portion close to the light-emitting portion. The light guide plate is also provided with a reflection pattern such that the reflectance of the tubular light source near the non-light emitting portion is higher than the reflectance near the light emitting portion.
なお、この明細書で表示画面とは、観察者が実際に視
認可能な表示範囲を意味しており、例えばモジュールカ
バーによって外枠が規定されている。In this specification, the display screen means a display range that can be visually recognized by an observer, and an outer frame is defined by a module cover, for example.
（作 用） この発明は、導光板に形成する反射パターンの形状
を、管状光源の管中央の発光部近傍に比べ、管状光源の
管端の非発光部近傍の反射率を上げるようにすることに
より、導光板における管状光源の発光部以外の非発光部
近傍並びにここから管状光源の長手方向に直交する方向
に沿う部分が暗くなるのを防ぐことができる。この結
果、表示特性を損なうことなく、放電型の光源全体を略
方形内に納めることが可能になる。(Operation) According to the present invention, the shape of a reflection pattern formed on a light guide plate is increased in reflectivity near a non-light-emitting portion at a tube end of a tubular light source, as compared with the vicinity of a light-emitting portion at the center of a tube of a tubular light source. Accordingly, it is possible to prevent the vicinity of the non-light-emitting portion other than the light-emitting portion of the tubular light source in the light guide plate and the portion along the direction perpendicular to the longitudinal direction of the tubular light source from here. As a result, the entire discharge type light source can be accommodated in a substantially rectangular shape without deteriorating the display characteristics.
（実施例） 以下、この発明の詳細を図面を参照して説明する。(Example) Hereinafter, the details of the present invention will be described with reference to the drawings.
第１図はこの発明の一実施例を示す概略図であり、同
図（ａ）は表示面側からみたときの概略平面図、同図
（ｂ）は同図（ａ）のＡ−Ａ′面を矢印方向からみたと
きの概略断面図、同図（ｃ）はこの発明の導光板におけ
る管状光源の非発光部近傍の印刷パターンを示す概略図
である。FIG. 1 is a schematic view showing an embodiment of the present invention, wherein FIG. 1 (a) is a schematic plan view when viewed from the display surface side, and FIG. 1 (b) is AA 'in FIG. 1 (a). FIG. 3C is a schematic cross-sectional view when the surface is viewed from the direction of the arrow, and FIG.
第１図（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ITO
（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の一主
面上には、例えばガラスファイバーからなるスペーサ17
を散布する。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。In FIGS. 1 (a) and 1 (b), for example, ITO is provided on one main surface of first and second substrates 10 and 11 made of glass, for example.
(Indium tin oxide) electrodes 12, 13
Are formed, and the alignment films 14 and 15 made of, for example, polyimide are formed so as to cover this. And the first
An adhesive 16 made of, for example, a thermosetting epoxy resin is printed on one of the second substrates 10 and 11, for example, on one main surface of the first substrate 10 in a frame shape with a portion to be a liquid crystal injection port. And
On the other of the first and second substrates 10 and 11, for example, on one main surface of the second substrate 11, a spacer 17 made of, for example, glass fiber is provided.
Spray. Subsequently, after combining the first and second substrates 10 and 11 such that one main surface side is opposed to each other, a liquid crystal 18 is injected from a liquid crystal injection port, so that the first and second substrates 10 and 11 are interposed. The liquid crystal 18 is held between the gaps. Then, by sealing the liquid crystal injection port, a predetermined liquid crystal display panel 19 is obtained. Subsequently, a polarizing plate 20 is attached to the other main surfaces of the first and second substrates 10 and 11.
また、第１基板１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。また、光導入端部23aと平行な方向
における表示画面の長さＬを管状光源24の長さ１以上例
えばＬ＞１とし、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、第
１図（ｃ）に示すように、管状光源24の管中央の発光部
24a近傍では管端の非発光部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。そして、液晶表示板
19、液晶駆動回路基板21、導光板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。On the other main surface side of the first substrate 1, a liquid crystal driving circuit substrate is provided.
21 is arranged, the liquid crystal display board 19 and the liquid crystal drive circuit board
21 is electrically connected, for example, by connection means 22 such as a flexible cable. A light guide plate 23 made of, for example, an acrylic plate is disposed between the liquid crystal display panel 19 and the liquid crystal drive circuit board 21, and a light introducing end 23a of the light guide plate 23 is provided.
, A discharge-type tubular light source 24 composed of a cold cathode tube, for example,
Is provided. Further, the length L of the display screen in a direction parallel to the light introducing end 23a is set to be equal to or longer than the length of the tubular light source 24, for example, L> 1, and the liquid crystal driving circuit board 21 in the light guide plate 23 is set.
A reflection pattern 25 is formed, for example, by milky white printing on the surface on the side opposite to. As shown in FIG. 1 (c), the reflection pattern 25 is a light emitting portion at the center of the tube of the tubular light source 24.
In the vicinity of 24a, the area of each reflection pattern 25 is made larger than that in the vicinity of the non-light emitting portion 24b at the tube end, and as a whole, the area of each reflection pattern 25 becomes larger as the distance from the tubular light source 24 increases. ing. And the LCD panel
19, the liquid crystal drive circuit board 21, the light guide plate 23, and the tubular light source 24 are integrated by a module cover 26 to constitute a predetermined liquid crystal display device.
この実施例では、導光板23には管状光源24の非発光部
24b近傍の反射率を発光部24a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、印刷精度のばらつきとモアレによる縞を防いでい
る。In this embodiment, the light guide plate 23 has a non-light emitting portion of the tubular light source 24.
Since the predetermined reflection pattern 25 is formed so that the reflectance near 24b is higher than the reflectance near the light emitting unit 24a, the length of the effective light emitting unit in the direction parallel to the light introduction end 23a is reduced. Even when the length is equal to the length of the tubular light source 24, the vicinity of the non-light emitting portion 24b can be prevented from being darker than the vicinity of the light emitting portion 24a. Therefore, the outer shape of the liquid crystal display device can be accommodated in a substantially rectangular shape. Further, by changing the shape of each reflection pattern 25 according to the distance from the tubular light source 24, variations in printing accuracy and fringes due to moire are prevented.
なお、今までは、液晶表示板が１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。Although the case where the liquid crystal display panel has a single-layer cell structure has been described so far, it goes without saying that this may be a multi-layer cell structure having two or more layers.
［発明の効果］ この発明は導光板に管状光源の非発光部近傍の反射率
を発光部近傍の反射率に比べて高くするように反射パタ
ーンを形成することにより、安価に且つ均一な面発光で
放電型発光照明光源の非発光部が装置の外形制約になら
ないコンパクトな背位照明付き液晶表示装置が得られ
る。[Effects of the Invention] The present invention forms an inexpensive and uniform surface light emission by forming a reflection pattern on a light guide plate such that the reflectance near the non-light emitting portion of the tubular light source is higher than the reflectance near the light emitting portion. Thus, a compact liquid crystal display device with a back-side illumination can be obtained in which the non-light emitting portion of the discharge type light emitting illumination light source does not restrict the outer shape of the device.
第１図はこの発明の一実施例を示す概略図、第２図は従
来の液晶表示装置の一例を示す概略図、第３図は従来の
液晶表示装置の他の例を示す概略図である。 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 23a……光導入端部 24……管状光源 24a……発光部 24b……非発光部 25……反射パターンFIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a conventional liquid crystal display device, and FIG. 3 is a schematic diagram showing another example of a conventional liquid crystal display device. . 10 First substrate 11 Second substrate 12, 13 Electrode 18 Liquid crystal 19 Liquid crystal display 23 Light guide plate 23a Light introduction end 24 Tube light source 24a Light emitting unit 24b: Non-light-emitting part 25: Reflection pattern
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−13478（ＪＰ，Ａ) 特開 昭57−128383（ＪＰ，Ａ) 実開 昭64−17573（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-13478 (JP, A) JP-A-57-128383 (JP, A) Japanese Utility Model Showa 64-17573 (JP, U)
Claims (6)
基板を互いの一主面側が対向するように組み合わせ，前
記第１及び第２基板間の間隙に液晶を挟持してなる液晶
表示板と、 一主面上に反射パターンが配置されると共に、少なくと
も一端を光導入端部として前記第１基板の他主面側に配
置される導光板と、 前記導光板の前記光導入端部に光を導く発光部と前記発
光部に近接して管端に配置される非発光部とを具備して
前記導光板の前記光導入端部に近接し前記光導入端部と
略平行して配置される放電型の管状光源とを備えた液晶
表示装置において、 前記管状光源の発光部の長さは前記発光部に近接した前
記光導入端部の長さよりも短く、且つ少なくとも前記発
光部に対応する前記光導入端部に隣接した前記導光板の
一領域よりも前記非発光部に対応する前記光導入端部に
隣接した前記導光板の他領域の反射率を高くするよう前
記反射パターンが設定されていることを特徴とする液晶
表示装置。1. A first and a second electrode having an electrode formed on one main surface.
A liquid crystal display panel in which liquid crystal is sandwiched in a gap between the first and second substrates; and a reflection pattern is disposed on one of the main surfaces. A light guide plate disposed on the other main surface side of the first substrate with one end serving as a light introduction end; a light emitting unit for guiding light to the light introduction end of the light guide plate; And a discharge-type tubular light source disposed near the light introduction end of the light guide plate and disposed substantially in parallel with the light introduction end, the liquid crystal display device comprising: The length of the light emitting portion of the tubular light source is shorter than the length of the light introducing end portion close to the light emitting portion, and at least from one region of the light guide plate adjacent to the light introducing end portion corresponding to the light emitting portion. The light guide plate adjacent to the light introducing end corresponding to the non-light emitting portion The liquid crystal display device, characterized in that said reflection pattern to increase the reflectivity of the other area is set.
り形成されていることを特徴とした液晶表示装置。2. A liquid crystal display device according to claim 1, wherein said reflection pattern is formed by printing.
光源から離れるにしたがって面積が増大することを特徴
とした液晶表示装置。3. The liquid crystal display device according to claim 1, wherein the area of the reflection pattern increases as the distance from the tubular light source increases.
ることを特徴とした液晶表示装置。4. A liquid crystal display device according to claim 1, wherein said tubular light source is a cold cathode ray tube.
カバーに収納され、前記モジュールカバーによって前記
液晶表示板の表示画面周辺が覆われていることを特徴と
した液晶表示装置。5. A liquid crystal display device according to claim 1, wherein the liquid crystal display panel is housed in a module cover, and a periphery of a display screen of the liquid crystal display panel is covered by the module cover.
表示板を駆動する液晶駆動回路基板を有し、前記第１基
板と前記液晶駆動回路基板との間に前記導光板が配置さ
れて成ることを特徴とした液晶表示装置。6. The liquid crystal display device according to claim 1, further comprising a liquid crystal drive circuit board for driving said liquid crystal display panel, wherein said light guide plate is disposed between said first substrate and said liquid crystal drive circuit board. A liquid crystal display device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1221733A JP2573365B2 (en) | 1989-08-30 | 1989-08-30 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1221733A JP2573365B2 (en) | 1989-08-30 | 1989-08-30 | Liquid crystal display |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4125329A Division JPH05264995A (en) | 1992-04-20 | 1992-04-20 | Back light for panel |
| JP6079261A Division JP2576832B2 (en) | 1994-03-28 | 1994-03-28 | Liquid crystal display |
| JP6079262A Division JP2818374B2 (en) | 1994-03-28 | 1994-03-28 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0385520A JPH0385520A (en) | 1991-04-10 |
| JP2573365B2 true JP2573365B2 (en) | 1997-01-22 |
Family
ID=16771398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1221733A Expired - Lifetime JP2573365B2 (en) | 1989-08-30 | 1989-08-30 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573365B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2554180Y2 (en) * | 1990-08-02 | 1997-11-12 | 株式会社 エンプラス | Surface light source device |
| JP2577265Y2 (en) * | 1991-10-08 | 1998-07-23 | 株式会社エンプラス | Surface light source device |
| JPH0610815U (en) * | 1992-07-14 | 1994-02-10 | 矢崎総業株式会社 | Vehicle instrument lighting system |
| US6295405B1 (en) * | 1997-07-25 | 2001-09-25 | Physical Optics Corporation | Light pipe for a backlighting system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57128383A (en) * | 1981-02-02 | 1982-08-09 | Mitsubishi Electric Corp | Surface lighting apparatus |
-
1989
- 1989-08-30 JP JP1221733A patent/JP2573365B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0385520A (en) | 1991-04-10 |
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