JPS636526A - Liquid crystal indicator - Google Patents

Liquid crystal indicator

Info

Publication number
JPS636526A
JPS636526A JP61150401A JP15040186A JPS636526A JP S636526 A JPS636526 A JP S636526A JP 61150401 A JP61150401 A JP 61150401A JP 15040186 A JP15040186 A JP 15040186A JP S636526 A JPS636526 A JP S636526A
Authority
JP
Japan
Prior art keywords
fluorescent tube
liquid crystal
crystal cell
temperature rise
heat dissipation
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
Application number
JP61150401A
Other languages
Japanese (ja)
Inventor
Fumio Matsukawa
文雄 松川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP61150401A priority Critical patent/JPS636526A/en
Publication of JPS636526A publication Critical patent/JPS636526A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE:To suppress a temperature rise of a diffusing plate and a liquid crystal cell in an illuminating box, to raise display quality, and to extend the life of the titled indicator, by providing radiation fins on a member for supporting a fluorescent tube, in a liquid crystal device provided with the fluorescent tube. CONSTITUTION:An illuminating box 10 is attached to a liquid crystal cell 1, and in its illuminating box 10, a diffusing plate 4, a fluorescent tube 2, and a reflecting plate 3 are provided. Its fluorescent tube 2 is supported by supporting members 5a, 5b. Also, in its supporting members 5a, 5b, radiation fins 9a, 9b, 9c and 9d are formed. Moreover, as for the fluorescent tube 2, a cold cathode fluorescent tube, and a hot cathode fluorescent tube are used. In this state, a temperature rise by the fluorescent tube 2 is brought to heat radiation by the radiation fins 9a, 9b, 9c and 9d. Accordingly, since the radiation fin is provided on the fluorescent tube, a temperature rise of the diffusing plate, the liquid crystal cell, etc., in the illuminating box is suppressed, a picture quality of a high quality is obtained, and the titled indicator can be extended to a long life.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、液晶表示器に関し、特にその照明ボックス
の放熱に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid crystal display, and particularly to heat dissipation of a lighting box thereof.

〔従来の技術〕[Conventional technology]

第３図ｆａ）は昭和６１年２月２５日発表、テレビジョ
ン学会技術報告、ＩＰＤ　１０５−２、第５頁〜第８頁
に掲載されている従来の液晶表示器を示す分解斜視図、
第３図（ｂ）は同じ（側面図である。Figure 3 fa) is an exploded perspective view showing a conventional liquid crystal display device published on February 25, 1986, Technical Report of the Television Society, IPD 105-2, pages 5 to 8;
FIG. 3(b) is the same (side view).

図において、ｉｌ＋は液晶セル、Ｑ〔は液晶セル（１）
を照光する照明ボックスで、照明ボックス［１Ｇは例え
ば１本の螢光管（２）０反射板（３）、拡散板（４）、
螢光管（２）を支持する支持部材（５ａ）　、　（５ｂ
）で構成されている。In the figure, il+ is a liquid crystal cell, Q [is a liquid crystal cell (1)
A lighting box that illuminates a lighting box [1G is, for example, one fluorescent tube (2), a reflection plate (3), a diffuser plate (4),
Support members (5a) and (5b) that support the fluorescent tube (2)
).

螢光管（２）には例えば冷陰極螢光管や熱陰極螢光管な
どが用いられる。また、反射板（３）には−般に金属板
が用いられ、例えば螢光管（２）に対向する側を鏡面加
工したｈ１乳白塗装して反射率を上げたアルミニウム板
などが用いられる。拡散板（４）にはアクリル製の乳白
板などが用いられるのが一般的である。支持部材（５ａ
）　、　（５ｂ）は螢光管（２）を穴Ｃ６ａ＞　。For example, a cold cathode fluorescent tube or a hot cathode fluorescent tube is used as the fluorescent tube (2). Further, a metal plate is generally used as the reflector plate (3), such as an aluminum plate whose side facing the fluorescent tube (2) is coated with a mirror-finished H1 milky white coating to increase the reflectance. A milky-white acrylic plate or the like is generally used as the diffusion plate (4). Support member (5a
), (5b) connect the fluorescent tube (2) to hole C6a>.

（６ｂ）で支持し、ネジ（７ａ）　、　（７ｂ）で反射
板（３１に固定されている。(6b) and fixed to the reflector plate (31) with screws (7a) and (7b).

次に動作について説明する。螢光管（２）からの光は、
−部は直接、−部は反射板（３）で反射されて拡散板（
４ンに入る。この光は拡散板（４）で拡散され、均一な
照度分布を持って液晶セル（１）を照射する。液晶セル
（１）は光スィッチの働きをし、液晶セル（１１内の液
晶層（図示せず）に電圧を印加したね、切ったりするこ
とで照射光をオシオフする。この結果、観測者（８）は
液晶セル（１１面上に光の濃淡を視認することとなり、
この濃淡を表示に利用するのが液晶表示器である。Next, the operation will be explained. The light from the fluorescent tube (2) is
- part is reflected directly, - part is reflected by the reflection plate (3) and diffused plate (
Enter 4th. This light is diffused by a diffusion plate (4) and illuminates the liquid crystal cell (1) with a uniform illuminance distribution. The liquid crystal cell (1) functions as a light switch, and by applying a voltage to the liquid crystal layer (not shown) in the liquid crystal cell (11) or turning it off, the irradiated light is turned off.As a result, the observer ( 8) is a liquid crystal cell (you can see the light and shade on the 11th surface,
A liquid crystal display uses this density for display purposes.

上記のような液晶表示器は薄形性を生かして壁かけテレ
ビへの応用が考ｔられている。液晶表示器の厚さは照明
ボックス（１Ｇの厚さに依存し、螢光管（２）は反射板
（３）と拡散板（４）に挾まれた狭い空間に設置される
ことになる。螢光管（２）はタングステン球やキセノシ
球に較べ、管面温度の上昇は少ないが、狭い空間に設置
することによｈ熱がこもり。The liquid crystal display described above is being considered for application to wall-mounted televisions by taking advantage of its thinness. The thickness of the liquid crystal display depends on the thickness of the lighting box (1G), and the fluorescent tube (2) will be installed in a narrow space sandwiched between a reflector (3) and a diffuser (4). Fluorescent tubes (2) have less rise in tube surface temperature than tungsten bulbs or xenon bulbs, but heat builds up when installed in a narrow space.

照明ボックス１内及び拡散板（４）の温度上昇が起きる
。支持部材（５）は螢光管（２）からの発熱を放散する
と共に放熱面積の大きい放射板（３）へ伝達する役目を
請っているが、その効果は充分でなく、温度上昇を引き
起こしている。−般に螢光管（２）はその周囲温度て対
して明るさが変化し、例えば熱陰極螢光管は周囲温度が
２０”Ｏ程度を起えると暗くなる。The temperature inside the lighting box 1 and the diffuser plate (4) increases. The support member (5) has the role of dissipating heat from the fluorescent tube (2) and transmitting it to the radiation plate (3), which has a large heat dissipation area, but its effect is not sufficient and causes a temperature rise. ing. - In general, the brightness of a fluorescent tube (2) changes with respect to its ambient temperature; for example, a hot cathode fluorescent tube becomes dark when the ambient temperature rises to about 20"O.

照明ボックスαＱの拡散板（４）上の輝度はできるだけ
高いことが必要である。例えば昭和６１年２月２５日発
表、テレビ学会技術報告ＩＰＤ１０５−２の記載によれ
ば、壁かけテレビの場合で７０００Ｃｄｌｄもの高輝度
が要求される。従って２０〜２５″Ｃの室温雰囲気で使
用される壁かけテレビを想定すると、照明ボックス凹の
温度上昇が表示輝度の低下を招き好ましくない。また、
螢光管（２）は周囲温度が高過ぎると、−般に管電流が
増して寿命が短くなる。It is necessary that the brightness on the diffuser plate (4) of the lighting box αQ be as high as possible. For example, according to the description in the Technical Report IPD105-2 of the Television Society published on February 25, 1985, a high brightness of 7000 Cdld is required for a wall-mounted television. Therefore, assuming that a wall-mounted TV is used in a room temperature atmosphere of 20 to 25"C, an increase in temperature in the recess of the lighting box will lead to a decrease in display brightness, which is undesirable.
If the ambient temperature of the fluorescent tube (2) is too high, the tube current will generally increase and its life will be shortened.

さらに拡散板（４）の温度上°昇は液晶セル（１）の温
度上昇を引き起こし、動作に支障をきたす。例えば液晶
セルｉｌ＋は最高動作温度を越えると、表示が見えなく
なってしまう。また、動作電圧及び表示の応答時間など
の温度依存性が大きく、質の高い表示画質を得るために
は極端に液晶セル（１）の温度が変わることは好ましく
ない。また−般に液晶セル（１）は高温で寿命が短くな
る。Furthermore, the temperature rise of the diffuser plate (4) causes a temperature rise of the liquid crystal cell (1), which impairs its operation. For example, when the liquid crystal cell il+ exceeds the maximum operating temperature, the display becomes invisible. Further, the operating voltage and display response time are highly temperature dependent, and in order to obtain high display image quality, it is not preferable for the temperature of the liquid crystal cell (1) to change drastically. Furthermore, the life of the liquid crystal cell (1) is generally shortened at high temperatures.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の液晶表示器は以上のように構成されているので、
照明ボックス内、拡散板及び液晶セルの温度上昇を引き
起こし、画質が低下したｈ１寿命が短（なるなどの問題
点があった。Conventional LCD displays are configured as described above, so
There were problems such as an increase in temperature in the lighting box, the diffuser plate, and the liquid crystal cell, resulting in decreased image quality and a short h1 life.

この発明は上記のような問題点を解消するためになされ
たもので、照明ボックス内、拡散板及び液晶セルの温度
上昇を抑えて、表示品位が高く、長寿命の液晶表示器を
得ることを目的とする。This invention was made to solve the above-mentioned problems, and aims to suppress the temperature rise in the lighting box, the diffuser plate, and the liquid crystal cell, and to obtain a liquid crystal display with high display quality and long life. purpose.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る液晶表示器は、螢光管、およびこの螢光
管からの照射光をオシオフすることによね表示を行なう
液晶セルを備えた液晶表示器において、螢光管の支持部
材に放熱フィンを形成したものである。A liquid crystal display according to the present invention includes a fluorescent tube and a liquid crystal cell that performs display by turning off light irradiated from the fluorescent tube. was formed.

〔作用〕[Effect]

この発明における放熱フィンは、螢光管の支持部材に設
けられてお幻、支持部材の放熱面積を大きくして、螢光
管の温度上昇に伴う照明ボックス内の温度上昇、および
拡散板、液晶セルの温度上昇を低減する。The heat dissipation fins in this invention are provided on the support member of the fluorescent tube to increase the heat dissipation area of the support member and prevent the temperature rise inside the lighting box due to the temperature rise of the fluorescent tube, and the diffusion plate and liquid crystal display. Reduce cell temperature rise.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。第１
図はこの発明の一実施例における液晶表示器を示す図で
、第１図（ａｌは分解斜視図、第１図ｆｌ））は側面図
である。（９ａ）、　（９ｂ）　、　（９ｃ）　、　（
９ｄ）は放熱フィンで例えばアルミニウム制の支持部材
（５ａ）、　（５ｂ）上に２個ずつ形成されている。（
図では支持部材（５ｂ）上に形成した放熱フィン（９ｃ
）　、　（９ｉ）の図示を省略している。）第２図は放
熱フィン（キ）を形成した支持部材（５ａ）を拡大して
−示す部分斜視図である。図は放熱フィン（キ）に例え
ば■菱三電気のアルミニウム製半導体ヒートシシク［０
−１６２５−８Ｔを用い、これをネジ（図示を省略）等
で支持部材（シ）に取の付けた例を示している。An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a liquid crystal display according to an embodiment of the present invention, and FIG. 1 (al is an exploded perspective view, FIG. 1 fl) is a side view. (9a), (9b), (9c), (
Reference numeral 9d) denotes heat dissipation fins, which are formed, for example, two each on the support members (5a) and (5b) made of aluminum. (
In the figure, the radiation fins (9c) formed on the support member (5b)
), (9i) are not shown. ) FIG. 2 is an enlarged partial perspective view of the support member (5a) on which radiation fins (X) are formed. The figure shows the heat dissipation fin (K) for example ■ Ryosan Electric's aluminum semiconductor heat shield [0
-1625-8T is used and an example is shown in which it is attached to a support member (shi) with screws (not shown) or the like.

放熱フィン（９）には、放熱効果を考えて、自然空冷用
にその形状を最適設計したものを用いる必要がある。こ
の実施例ではＩＣ−１６２５−８Ｔ放熱フイン（９）の
高さくＨ）は１６ｆｉ、ピッチｔＰ）は５Ｗａ、長さく
Ｌ＋は２５器である。The heat dissipation fins (9) need to be optimally designed for natural air cooling in consideration of the heat dissipation effect. In this embodiment, the height H) of the IC-1625-8T heat radiation fin (9) is 16 fi, the pitch tP) is 5 Wa, and the length L+ is 25 fi.

動作は従来と同様であるが、螢光管（２）が温度上昇す
ると、この熱は螢光管（２）を支持する支持部材１５）
に伝わる。この支持部材（５１には放熱フィン（９（が
設けられておわ放熱面積が大きく構成されているので、
熱を放散すると共に、さらに放熱面積の大きい反射板（
３）へ熱を伝達する。この放熱フィン（９）によって従
来よりもスムーズに支持部材（５１における熱の放散が
行なわれ、照明ボックス＋１（ｌ内の温度上昇および拡
散板（４１の温度上昇を低減する。この結果、照明ボッ
クスαｑ内の温度上昇によって生じる表示輝度の低下、
螢光管（２）の短寿命化、および拡散板（４）の温度上
昇によって生じる誤動作や表示画質の低下、液晶セルの
短寿命化などを防ぐことができる。The operation is the same as before, but when the temperature of the fluorescent tube (2) rises, this heat is transferred to the support member 15) that supports the fluorescent tube (2).
It is transmitted to This support member (51) is provided with heat dissipation fins (9) and has a large heat dissipation area.
In addition to dissipating heat, a reflector plate (
3) Transfer heat to. These heat dissipation fins (9) dissipate heat in the support member (51) more smoothly than before, reducing the temperature rise in the lighting box +1 (l) and the temperature rise in the diffusion plate (41). Decrease in display brightness caused by temperature rise in αq,
It is possible to prevent malfunctions, deterioration of display image quality, and shortening of the life of the liquid crystal cell caused by shortening of the life of the fluorescent tube (2) and rise in temperature of the diffuser plate (4).

なお、放熱フィン（９）の構成は、例えば液晶表示器を
壁かけテレビに用いる場合は、第１図（ａｌに示すよう
に設置される。従って自然空冷を考えた場合、フィン（
９１は縦に平行に形成することが望ましい。The configuration of the radiation fins (9) is, for example, when a liquid crystal display is used in a wall-mounted TV, installed as shown in FIG.
91 is preferably formed vertically and in parallel.

放熱フィン（９）または支持部材（５）の螢光管（２）
に相対しない面を黒色塗装すれば放熱効果が高まる。Fluorescent tube (2) of heat radiation fin (9) or support member (5)
The heat dissipation effect will be enhanced by painting the surfaces that are not facing black.

さらに放熱フィン（９）および支持部材（５）の螢光管
（２）に相対しない面を黒色塗装すればさらに効果的で
ある。Furthermore, it is even more effective if the surfaces of the radiation fins (9) and the support member (5) that do not face the fluorescent tube (2) are painted black.

また、支持部材１５１と放熱フィシ（９ンの材質は同一
でも異なってもよい。要は、支持部材（５１の放熱面積
を大きくして放熱効果が得られるものを選定すればよい
。Further, the materials of the support member 151 and the heat dissipation fish (9) may be the same or different.In short, it is sufficient to select materials that can increase the heat dissipation area of the support member (51) and obtain a heat dissipation effect.

さらに、以上の実施例では、放熱フィン（９ｌ；支持部
材（５）に例えばネジどめされていたが、これらを−体
形成してもよい。また以上の実施例では支持部材（５）
１本あだｈ２個の半導体ヒートシンクを取り付けて放熱
フィン（９夛を形成していたが、その数はこれに限定さ
れないことは言うまでもないことである。Further, in the above embodiments, the heat dissipation fins (9l) are screwed to the support member (5), for example, but they may also be formed into a body.
Two semiconductor heat sinks were attached to one heat sink to form nine heat dissipation fins, but it goes without saying that the number is not limited to this.

また、螢光管（２）としては、何でもよ（、例えば冷陰
極螢光管であってもよいし、熱陰極螢光管であってもよ
い。Furthermore, the fluorescent tube (2) may be of any type (for example, it may be a cold cathode fluorescent tube or a hot cathode fluorescent tube).

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、螢光管、およびこの螢
光管からの照射光をオシオフすることにより表示を行な
う液晶セルを備えた液晶表示器において、螢光管の支持
部材に放熱フィンを形成することにより、支持部材にお
ける放熱面積を増大し、液晶表示器を構成する照明ボッ
クスの温度上昇が抑えられ、この結果高品位画質、長寿
命の液晶表示器が得られる効果がある。As described above, according to the present invention, in a liquid crystal display equipped with a fluorescent tube and a liquid crystal cell that performs display by turning off the irradiated light from the fluorescent tube, a heat dissipation fin is attached to the supporting member of the fluorescent tube. By forming the support member, the heat dissipation area is increased, and the temperature rise of the lighting box constituting the liquid crystal display is suppressed. As a result, a liquid crystal display with high image quality and long life can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ｆａ）ｌｂ）はこの発明の一実施例による液晶表
示器を示す分解斜視図、及び側面図、第２図はこの発明
の一実施例に係る放熱フィンな°設けた支持部材を拡大
して示す部分斜視図、第３図（ａｌｌｌ））は従来の液
晶表示器を示す分解斜視図、及び側面図である。 ＋１１・・・液晶セル、（２）・・・螢光管、（５１・
・・支持部材、（９）・・・放熱フィン。 なお、図中同一符号は同一、又は相当部分を示す。Figures 1 fa) and lb) are exploded perspective views and side views showing a liquid crystal display according to an embodiment of the present invention, and Figure 2 is an enlarged view of a support member provided with a heat dissipation fin according to an embodiment of the present invention. FIG. 3 is an exploded perspective view and a side view of a conventional liquid crystal display. +11...Liquid crystal cell, (2)...Fluorescent tube, (51.
...Supporting member, (9)...Radiation fin. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (3)

【特許請求の範囲】[Claims] （１）螢光管、およびこの螢光管からの照射光をオンオ
フすることにより表示を行なう液晶セルを備えた液晶表
示器において、上記螢光管の支持部材に放熱フィンを形
成することを特徴とする液晶表示器。(1) A liquid crystal display equipped with a fluorescent tube and a liquid crystal cell that performs display by turning on and off light irradiated from the fluorescent tube, characterized in that a heat dissipation fin is formed on the supporting member of the fluorescent tube. LCD display. （２）螢光管は、冷陰極螢光管であることを特徴とする
特許請求の範囲第１項記載の液晶表示器。(2) The liquid crystal display according to claim 1, wherein the fluorescent tube is a cold cathode fluorescent tube. （３）螢光管は、熱陰極螢光管であることを特徴とする
特許請求の範囲第１項記載の液晶表示器。(3) The liquid crystal display according to claim 1, wherein the fluorescent tube is a hot cathode fluorescent tube.
JP61150401A 1986-06-26 1986-06-26 Liquid crystal indicator Pending JPS636526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61150401A JPS636526A (en) 1986-06-26 1986-06-26 Liquid crystal indicator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61150401A JPS636526A (en) 1986-06-26 1986-06-26 Liquid crystal indicator

Publications (1)

Publication Number Publication Date
JPS636526A true JPS636526A (en) 1988-01-12

Family

ID=15496166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61150401A Pending JPS636526A (en) 1986-06-26 1986-06-26 Liquid crystal indicator

Country Status (1)

Country Link
JP (1) JPS636526A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455887A2 (en) * 1990-04-30 1991-11-13 VDO Luftfahrtgeräte Werk GmbH Lighting device
US5414542A (en) * 1988-07-01 1995-05-09 Canon Kabushiki Kaisha Liquid crystal apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533421B2 (en) * 1971-11-08 1980-08-30
JPS59176769A (en) * 1983-03-28 1984-10-06 株式会社東芝 Liquid crystal display
JPS6199259A (en) * 1984-10-19 1986-05-17 Hitachi Ltd Surface light source equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533421B2 (en) * 1971-11-08 1980-08-30
JPS59176769A (en) * 1983-03-28 1984-10-06 株式会社東芝 Liquid crystal display
JPS6199259A (en) * 1984-10-19 1986-05-17 Hitachi Ltd Surface light source equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414542A (en) * 1988-07-01 1995-05-09 Canon Kabushiki Kaisha Liquid crystal apparatus
EP0455887A2 (en) * 1990-04-30 1991-11-13 VDO Luftfahrtgeräte Werk GmbH Lighting device

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