JPH0636132B2 - Liquid crystal display - Google Patents
Liquid crystal displayInfo
- Publication number
- JPH0636132B2 JPH0636132B2 JP34313289A JP34313289A JPH0636132B2 JP H0636132 B2 JPH0636132 B2 JP H0636132B2 JP 34313289 A JP34313289 A JP 34313289A JP 34313289 A JP34313289 A JP 34313289A JP H0636132 B2 JPH0636132 B2 JP H0636132B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- display device
- panel
- crystal display
- 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
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は画像を表示する液晶装置、特に強誘電性液晶表
示装置に関するものである。The present invention relates to a liquid crystal device that displays an image, and more particularly to a ferroelectric liquid crystal display device.
従来、液晶表示装置に於ける液晶パネルは第７図に示す
ような方法で固定されていた。同図に於て、７０４は液
晶が封入された液晶パネル、７０３は上偏光板、７０５
は下偏光板、７０２は液晶パネル７０４を電気的に駆動
する回路基板、７０６は液晶パネル７０４と回路基板７
０２を電気的に導通するゴムコネクタ、７０７は液晶パ
ネル７０４を照明するためのバツクライト、７００は液
晶パネルを固定するフレーム、７０１は液晶パネル７０
４と回路基板７０２とバツクライト７０７を結合するた
めのフレーム７００の折り曲げ部である。Conventionally, a liquid crystal panel in a liquid crystal display device has been fixed by the method shown in FIG. In the figure, 704 is a liquid crystal panel in which liquid crystal is sealed, 703 is an upper polarizing plate, and 705.
Is a lower polarizing plate, 702 is a circuit board for electrically driving the liquid crystal panel 704, and 706 is the liquid crystal panel 704 and the circuit board 7.
A rubber connector electrically connecting 02, a back light 707 for illuminating the liquid crystal panel 704, a frame 700 for fixing the liquid crystal panel, and a liquid crystal panel 701.
4 is a bent portion of the frame 700 for connecting the circuit board 702 and the back light 707.
しかし、上記従来例の液晶パネル固定法はネマチツク液
晶パネルに関するものであり、強誘電性液晶パネルを同
様の方法で固定した場合には以下に述べる種々の問題点
がある。すなわち、第７図に示すような方法で強誘電性
液晶パネルを固定した場合、 （１）液晶パネルを固定する際、少なからず液晶パネル
に歪が与えられるため強誘電性液晶の配向が変化して画
質の劣化を起こす。However, the liquid crystal panel fixing method of the above conventional example relates to a nematic liquid crystal panel, and there are various problems described below when the ferroelectric liquid crystal panel is fixed by the same method. That is, when the ferroelectric liquid crystal panel is fixed by the method as shown in FIG. 7, (1) When the liquid crystal panel is fixed, the liquid crystal panel is distorted to some extent and the alignment of the ferroelectric liquid crystal changes. Cause deterioration of image quality.
（２）ネマチツク液晶に比較して、はるかに小さな衝撃
や振動でもそれが液晶パネルへ伝達されると配向性が変
化して画質の劣化を起こす。(2) Compared to nematic liquid crystal, even a much smaller impact or vibration causes a change in orientation when it is transmitted to the liquid crystal panel, causing deterioration in image quality.
そこで本発明者らは第８図に示すような方法を先に提案
した（特願昭６３−２４２５７７号特開平０２−０９３
４２５号公報）。Therefore, the present inventors have previously proposed a method as shown in FIG. 8 (Japanese Patent Application No. 63-242577, Japanese Patent Laid-Open No. 02-093).
No. 425).
同図に於て８０５は画像表示用の液晶パネル、８０２は
液晶パネル８０５を電気的に駆動するための回路基板、
８０３は液晶パネル８０５と回路基板８０２を電気的に
接続するためのフレキシブルなプリント配線フイルム、
８０１は液晶パネル８０５と回路基板８０２を支持する
ための充分な剛性を備えた筺体で、例えば金属ブロツク
あるいは金属ダイキヤストが使用される。８０６は液晶
パネル８０５を固定するための接着剤、８０４は回路基
板８０２と筺体８０１との間を電気的絶縁するための絶
縁板、８０７は液晶パネル８０５を照明するためのバツ
クライトで、前面に散乱拡散光を得るための拡散板８０
８が設けられている。In the figure, 805 is a liquid crystal panel for image display, 802 is a circuit board for electrically driving the liquid crystal panel 805,
Reference numeral 803 denotes a flexible printed wiring film for electrically connecting the liquid crystal panel 805 and the circuit board 802,
Reference numeral 801 denotes a housing having sufficient rigidity to support the liquid crystal panel 805 and the circuit board 802, and for example, a metal block or a metal die cast is used. Reference numeral 806 is an adhesive for fixing the liquid crystal panel 805, 804 is an insulating plate for electrically insulating the circuit board 802 and the housing 801, and 807 is a back light for illuminating the liquid crystal panel 805, which is scattered on the front surface. Diffuser 80 for obtaining diffused light
8 are provided.
本方法によれば、機械的な外部負荷に対して液晶パネル
８０５に歪を与えにくい金属筺体８０１を用いたため、
液晶パネル８０５を安定した状態で確実に保持すること
ができ、固定後は外力による配向の変化及び画質の劣化
を防止することが可能となった。According to this method, since the metal housing 801 that is less likely to give distortion to the liquid crystal panel 805 against a mechanical external load is used,
The liquid crystal panel 805 can be reliably held in a stable state, and after fixing, it is possible to prevent a change in orientation and a deterioration in image quality due to an external force.
しかしながら、上記従来例では金属筺体を用いたため静
的な外力による機械的変形に対しては効果が大きいが、
液晶表示装置が衝撃，振動などの動的外部負荷を受けた
時には次の様な問題があった。すなわち、第８図に於て
液晶パネル８０５はその下面周辺部を筺体８０１上に接
着剤８０６を用いて固定されているために、＋Ｚ方向の
衝撃を受けると液晶パネル８０５は周辺部を支点として
中央部が＋Ｚ方向に変位し液晶パネル８０５に曲げ変形
が生じる。従って液晶パネルのサイズが大型化すると曲
げ変形が大きくなり変形量が所定の値を越えると配向が
変化して画質が劣化するという問題があった。そこで液
晶パネル８０５の曲げ変位を小さくするために、液晶パ
ネル８０５をバツクライト８０７上の拡散板８０８の上
面に直かに面接触させて曲げ変位を抑えることが考えら
れるが、この場合は液晶パネルの固定後に行なう歪除去
のための配向制御の熱処理で問題が生ずる。すなわち、
強誘電性液晶にはネマチツク液晶に比較して、はるかに
小さな機械的ストレスで配向性が変化するため、液晶パ
ネル取付後に液晶パネルを強誘電性を示すカイラルスメ
クチツクＣ相よりも高い温度まで加熱して、その後カイ
ラルスメクチツクＣ相の所定の温度まで徐冷することに
よる配向制御処理（以下、再配向処理と称す）を行なう
必要がある。この時、第８図に於てバツクライト８０７
及び拡散板８０８は通常、プラスチツク製であり、それ
らの熱膨張係数は液晶パネル８０５と比べてかなり大き
いため、それらが液晶パネル８０５と接触していると加
熱ピーク時に液晶パネル８０５はバツクライト８０７及
び拡散板８０８から大きな曲げ変形力を受ける。加熱ピ
ーク時と徐冷後とで液晶パネルの状態が異なると、再配
向処理を行なっても強誘電性液晶は均一な層構造となら
ず、従って液晶パネルの配向制御ができなくなるという
問題があった。However, in the above-mentioned conventional example, since the metal housing is used, the effect is great against mechanical deformation due to static external force,
When a liquid crystal display device receives a dynamic external load such as shock or vibration, there are the following problems. That is, in FIG. 8, since the liquid crystal panel 805 has its lower surface peripheral portion fixed on the housing 801 with the adhesive 806, when the liquid crystal panel 805 receives an impact in the + Z direction, the liquid crystal panel 805 uses the peripheral portion as a fulcrum. The central portion is displaced in the + Z direction, and the liquid crystal panel 805 is bent and deformed. Therefore, there is a problem that when the size of the liquid crystal panel is increased, the bending deformation is increased, and when the deformation amount exceeds a predetermined value, the orientation is changed and the image quality is deteriorated. Therefore, in order to reduce the bending displacement of the liquid crystal panel 805, it is conceivable to bring the liquid crystal panel 805 into direct surface contact with the upper surface of the diffusion plate 808 on the backlight 807 to suppress the bending displacement. A problem arises in the orientation control heat treatment for removing strain after fixing. That is,
Compared to nematic liquid crystals, the orientation changes with a much smaller mechanical stress in ferroelectric liquid crystals, so after the liquid crystal panel is attached, the liquid crystal panel has a higher temperature than the chiral smectic C phase that exhibits ferroelectricity. It is necessary to perform orientation control treatment (hereinafter referred to as reorientation treatment) by heating and then gradually cooling the chiral smectic C phase to a predetermined temperature. At this time, back light 807 in FIG.
Also, since the diffusion plate 808 is usually made of plastic and the coefficient of thermal expansion thereof is considerably larger than that of the liquid crystal panel 805, when they are in contact with the liquid crystal panel 805, the liquid crystal panel 805 causes the back light 807 and the diffusion when the heating peak occurs. A large bending deformation force is received from the plate 808. If the state of the liquid crystal panel differs between the peak heating time and after slow cooling, there is a problem that the ferroelectric liquid crystal does not have a uniform layer structure even after the reorientation treatment, and thus the orientation control of the liquid crystal panel cannot be performed. It was
さらに、金属筺体を使用しているため、プラスチツクと
比べてコストが高く、重量も大きいという欠点があっ
た。Further, since the metal casing is used, there are disadvantages that the cost is higher and the weight is higher than that of the plastic.
本発明によれば上述の問題を解決するため、液晶パネル
の固定構造として、弾性部材により液晶パネルを筺体の
開口部内に宙吊りに支持し、その下方の空間が略密閉構
造であることを特徴としている。According to the present invention, in order to solve the above problems, as a liquid crystal panel fixing structure, the liquid crystal panel is supported by an elastic member suspended in the opening of the housing, and the space below is a substantially hermetic structure. There is.
従って本発明によれば、液晶表示装置が落下衝撃等の動
的外部負荷を受けた時、液晶パネルはエアーダンパの作
用により曲げ変形を軽減でき、配向の変化及び画質の劣
化を防止することができる。Therefore, according to the present invention, when the liquid crystal display device receives a dynamic external load such as a drop impact, the liquid crystal panel can reduce the bending deformation by the action of the air damper, and can prevent the change of the alignment and the deterioration of the image quality. it can.
以下、図面により本発明の実施例を説明する。第１図は
本発明の第１の実施例に係る液晶表示装置の断面図であ
る。図に於て、１００は２枚の対向するガラス基板１０
１，１０２の間に液晶（図示せず）を挟持した液晶パネ
ル、１０３は上偏光板、１０４は下偏光板、１０６は液
晶パネル１００を駆動するための回路基板、１０５は回
路基板１０６と液晶パネル１００を電気的に接続するた
めのフレキシブルなプリント配線フイルムである。１０
７は液晶パネル１００を支持するためのガラスからなる
パネル支持基板で、液晶パネル１００の下面周辺部全周
にわたってゴム系の接着剤１１４が塗布され液晶パネル
１００を支持固定している。１０８は液晶パネル１０
０，パネル支持基板１０７及び回路基板１０６を固定支
持するための例えばプラスチツクからなる筺体であり、
パネル支持基板１０７の端部と筺体の開口窓部１０８−
１の間に例えばゴム系のシリコン接着剤からなる弾性部
材１１５が充填されている。１０９は液晶パネル１００
を照明するためのバツクライト、１１０はバツクライト
１０９からの照射光を散乱拡散光にするための拡散板
で、バツクライト１０９の内部のランプや反射板等は図
示しない。１１８は下面を拡散板１１０に支持され、上
面周辺部が筺体開口窓部１０８−１に当接された、例え
ばガラスからなる仕切板である。仕切板１１８はバツク
ライト１０９及び拡散板１１０に支持されているため＋
Ｚ方向には変位を生じない。１１７はパネル支持基板１
０７、筺体開口窓部１０８−１、仕切板１１８及び弾性
部材１１５で周囲を囲まれた略密閉空間で、筺体１０８
に設けられた小孔１１６を介して外気に通じている。１
１１は液晶パネル１００を保護するための保護ガラス
で、上カバー１１２の開口窓部に固定されており、１１
３はバツクライト１０９及び筺体１０８の底面を被う下
カバーである。上カバー１１２と下カバー１１３はネジ
（図示せず）で結合され、ノイズ低減のためともに回路
基板１０６のアース電位に接続されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a liquid crystal display device according to a first embodiment of the present invention. In the figure, 100 is two glass substrates 10 facing each other.
A liquid crystal panel in which a liquid crystal (not shown) is sandwiched between 1 and 102, 103 is an upper polarizing plate, 104 is a lower polarizing plate, 106 is a circuit board for driving the liquid crystal panel 100, and 105 is a circuit board 106 and a liquid crystal. This is a flexible printed wiring film for electrically connecting the panel 100. 10
Reference numeral 7 denotes a panel support substrate made of glass for supporting the liquid crystal panel 100, and a rubber adhesive 114 is applied to the entire periphery of the lower surface of the liquid crystal panel 100 to support and fix the liquid crystal panel 100. Reference numeral 108 denotes the liquid crystal panel 10.
0, a panel support board 107 and a circuit board 106 for fixedly supporting, for example, a housing made of plastic,
An edge portion of the panel support substrate 107 and an opening window portion 108 of the housing-
An elastic member 115 made of, for example, a rubber-based silicone adhesive is filled between the two. 109 is a liquid crystal panel 100
Is a diffuser plate for illuminating the light emitted from the backlight unit 109 into scattered diffuse light, and a lamp, a reflector plate, etc. inside the backlight unit 109 are not shown. Reference numeral 118 is a partition plate made of, for example, glass, the lower surface of which is supported by the diffusion plate 110 and the upper peripheral portion of which is in contact with the housing opening window 108-1. Since the partition plate 118 is supported by the backlight 109 and the diffusion plate 110,
No displacement occurs in the Z direction. 117 is a panel support substrate 1
07, the housing opening window portion 108-1, the partition plate 118, and the elastic member 115.
It communicates with the outside air through a small hole 116 provided in the. 1
Reference numeral 11 denotes a protective glass for protecting the liquid crystal panel 100, which is fixed to the opening window portion of the upper cover 112.
Reference numeral 3 denotes a lower cover that covers the back light 109 and the bottom surface of the housing 108. The upper cover 112 and the lower cover 113 are coupled by screws (not shown), and both are connected to the ground potential of the circuit board 106 for noise reduction.
次に、この第１の実施例の特徴について述べるが、ま
ず、画質劣化の原因となる液晶の配向劣化について説明
する。第２図−（１）は液晶パネル２００の断面を模式
的に拡大したものである。同図に於て２０１は強誘電性
液晶、２０２及び２０３は強誘電性液晶２０１を両面か
ら間隙約１．４μｍで保持するための厚さ１．１mmのガ
ラス基板、２０４及び２０５は強誘電性液晶２０１を駆
動するための膜厚約１５００ÅのＩＴＯ（Ｉｎ２Ｏ３−
ＳｎＯ２）電極膜、２０６及び２０７は強誘電性液晶２
０１の配向性を保つための膜厚約１００Åのポリイミド
配向膜で、強誘電性液晶２０１は中央部が折れ曲がった
規則的な層構造を形成している。Next, the features of the first embodiment will be described. First, the alignment deterioration of the liquid crystal which causes the deterioration of the image quality will be described. FIG. 2- (1) is a schematic enlarged view of the cross section of the liquid crystal panel 200. In the figure, 201 is a ferroelectric liquid crystal, 202 and 203 are 1.1 mm thick glass substrates for holding the ferroelectric liquid crystal 201 with a gap of about 1.4 μm from both sides, and 204 and 205 are ferroelectric liquid crystals. ITO (In 2 O 3 −) having a film thickness of about 1500 Å for driving the liquid crystal 201
SnO 2 ) electrode film, and 206 and 207 are ferroelectric liquid crystals 2
The ferroelectric liquid crystal 201 has a regular layer structure in which the central part is bent, and is a polyimide alignment film having a film thickness of about 100 Å for maintaining the alignment property of 01.
次に液晶パネル２００が＋Ｚ方向に機械的外力を受ける
と液晶パネル２００は変形し、所定の値以上の変形を受
けると第２図−（２）に示すように強誘電性液晶２０１
の層構造が崩れ、サンデツドテクスチヤーのような配向
欠陥を生じる。この状態で画像を表示すると、強誘電性
液晶２０１の規則的なスイツチングが損なわれ、良好な
画質が得られなくなる。実際の液晶パネル支持形態に於
ては、液晶層構造の崩れを伴うような液晶パネルの変形
は局所的な曲げ変形として現われ易い。つまり一様な曲
げ変形を受けている領域では局所的曲げ変形の領域より
も液晶の層構造は崩れにくい。第３図は第８図に示す従
来の液晶表示装置が＋Ｚ方向に落下衝撃を受けた時の液
晶パネル８０５の曲げ変形状態を表わしたものである。
図中、第８図と同一の符号は同一の部材を表わしてい
る。液晶パネル８０５は初期状態と比べて中央部ＣがＺ
方向に最も大きく変位し、接着剤８０６の直上部Ａは支
点となって変位を生じない。液晶パネル８０５の全領域
に於て、最も急激に単位面積あたりの曲げ変形量が大き
くなる（曲率半径が小さい）のはＢ部近傍であり、この
部分にサンデツドテクスチヤーの如き配向欠陥が現われ
る。また、このような液晶パネル支持形態では、液晶パ
ネルのサイズが大型化するにつれて局所的曲げ変形も大
きくなり耐衝撃性能がさらに低下する。Next, when the liquid crystal panel 200 receives a mechanical external force in the + Z direction, the liquid crystal panel 200 is deformed, and when it is deformed by a predetermined value or more, as shown in FIG.
, The layer structure of P.sub.2 is broken, and alignment defects such as sanded texture occur. When an image is displayed in this state, regular switching of the ferroelectric liquid crystal 201 is impaired, and good image quality cannot be obtained. In the actual supporting form of the liquid crystal panel, the deformation of the liquid crystal panel accompanied by the collapse of the liquid crystal layer structure is likely to appear as a local bending deformation. In other words, the layer structure of the liquid crystal is less likely to collapse in the region that is subjected to the uniform bending deformation than in the region that is locally bent and deformed. FIG. 3 shows a bending deformation state of the liquid crystal panel 805 when the conventional liquid crystal display device shown in FIG. 8 receives a drop impact in the + Z direction.
In the figure, the same reference numerals as those in FIG. 8 represent the same members. In the liquid crystal panel 805, the central portion C is Z compared to the initial state.
The maximum displacement in the direction is made, and the upper portion A of the adhesive 806 serves as a fulcrum and does not cause displacement. In the entire region of the liquid crystal panel 805, the amount of bending deformation per unit area becomes the largest (the radius of curvature is small) in the vicinity of the B portion, and an alignment defect such as a sand texture appears in this portion. . Further, in such a liquid crystal panel supporting form, as the size of the liquid crystal panel increases, the local bending deformation also increases and the impact resistance further deteriorates.
しかしながら、本発明の実施例に於ては弾性部材を用い
て液晶パネルを筺体の開口窓部内に宙吊りに支持し、そ
の下方の空間が略密閉構造であるため、液晶パネルは衝
撃を受けてもエアーダンパの作用により、曲げ変形量が
極めて小さく抑えられ、サンデツドテクスチヤーの如き
配向欠陥の発生を防止することが可能となる。第４図は
本実施例の液晶表示装置が＋Ｚ方向に落下衝撃を受けた
時の液晶パネル１００の曲げ変形状態の特徴を表わすた
め、弾性部材１１５に支持されたパネル支持基板１０７
の状態を模式的に表わしたものである。液晶パネル１０
０は接着剤１１４でパネル支持基板１０７に固定されて
いるため、パネル支持基板１０７の変形にほぼ追従す
る。However, in the embodiment of the present invention, since the liquid crystal panel is suspended in the opening window of the housing by using the elastic member, and the space below the space is a substantially sealed structure, the liquid crystal panel is not affected by the impact. Due to the action of the air damper, the amount of bending deformation can be suppressed to a very small value, and it becomes possible to prevent the occurrence of alignment defects such as sanded texture. FIG. 4 shows the characteristic of the bending deformation state of the liquid crystal panel 100 when the liquid crystal display device of the present embodiment receives a drop impact in the + Z direction. Therefore, the panel support substrate 107 supported by the elastic member 115 is shown in FIG.
This is a schematic representation of the state of. Liquid crystal panel 10
Since 0 is fixed to the panel support substrate 107 with the adhesive 114, it substantially follows the deformation of the panel support substrate 107.
まず、第４図−（１）は第１図の実施例の液晶表示装置
からバツクライト１０９，拡散板１１０及び仕切板１１
８を取除き、略密閉空間１１７が存在しない状態で＋Ｚ
方向に落下衝撃を与えた時のパネル支持基板１０７の曲
げ変形状態を表わしている。尚、上カバー１１２，下カ
バー１１３及び保護ガラス１１１も取除いてある。この
時、弾性部材１１５が＋Ｚ方向に大きく変位し、パネル
支持基板１０７は一様に大きな曲げ変形を生ずる。First, FIG. 4- (1) shows the backlight 109, the diffusion plate 110, and the partition plate 11 from the liquid crystal display device of the embodiment of FIG.
+ Z in the state where there is almost no enclosed space 117 after removing 8
3 shows a bending deformation state of the panel support substrate 107 when a drop impact is applied in the direction. The upper cover 112, the lower cover 113, and the protective glass 111 are also removed. At this time, the elastic member 115 is largely displaced in the + Z direction, and the panel support substrate 107 uniformly undergoes large bending deformation.
次に第４図−（２）は本実施例の液晶表示装置が＋Ｚ方
向に落下衝撃を受けた時のパネル支持基板１０７の状態
を表わしている。この場合は略密閉空間１１７がエアー
ダンパとしてパネル支持基板１０７に均等に作用するた
め、パネル支持基板の曲げ変形量は小さく、従って液晶
パネル１００の曲げ変形量も小さく耐衝撃性能が向上す
る。Next, FIG. 4- (2) shows the state of the panel support substrate 107 when the liquid crystal display device of the present embodiment receives a drop impact in the + Z direction. In this case, since the substantially closed space 117 acts as an air damper evenly on the panel supporting substrate 107, the amount of bending deformation of the panel supporting substrate is small, so that the amount of bending deformation of the liquid crystal panel 100 is small and the impact resistance performance is improved.
第５図はエアーダンパの効果を示すはため、第４図−
（１），（２）各々の状態について液晶パネルの曲げ変
形量と落下衝撃値の関係を表わした特性図である。この
時用いた液晶パネルのサイズは縦３００mm、横２５０m
m、厚さ１．１mm×２、パネル支持基板の大きさは液晶
パネルサイズとほぼ等しい。ここでは便宜上、曲げ変形
量を表わすパラメーターとして、パネル支持基板端部の
ａ点及び中央部ｂ点の初期状態からの＋Ｚ方向への変位
量をそれぞれＡ，Ｂとし、Ｘ＝Ｂ−Ａを用いる。図中●
印はサンデツドテクスチヤーの出現を表わし、○印は欠
陥が発生せず良好な画像が得られたことを表わしてい
る。第５図よりＸ＝２．５mm以上で配向欠陥が発生して
いるが、本実施例ではエアーダンパの作用によって液晶
パネルの曲げ変形量が小さく抑えられるため、耐衝撃性
が大きく向上できたことが判る。Fig. 5 shows the effect of the air damper.
It is a characteristic view showing the relationship between the amount of bending deformation and the drop impact value of the liquid crystal panel in each of the states (1) and (2). The size of the liquid crystal panel used at this time is 300 mm in length and 250 m in width.
m, thickness 1.1 mm × 2, the size of the panel support substrate is almost equal to the liquid crystal panel size. Here, for the sake of convenience, as the parameters representing the bending deformation amount, the displacement amounts in the + Z direction from the initial state of the point a and the center portion b of the panel supporting board are respectively defined as A and B, and X = B−A is used. . In the figure ●
The mark indicates the appearance of sand texture, and the mark indicates that no defect was generated and a good image was obtained. As shown in FIG. 5, alignment defects were generated at X = 2.5 mm or more, but in this embodiment, the amount of bending deformation of the liquid crystal panel was suppressed by the action of the air damper, so that the impact resistance was greatly improved. I understand.
以上述べた様に本実施例に於ける略密閉空間１１７はエ
アーダンパ作用を得るために必須のものであるが、必ず
しも完全な密閉状態である必要はなく、小さな空気逃げ
穴か隙間が存在しても上述のエアーダンパ作用が得られ
ている。これは落下衝撃時の作用時間が通常６〜１１ｍ
ｓｅｃと非常に短時間であることによる。むしろ好まし
い形態では以下に述べる理由から、完全密閉空間よりも
小孔等の空気逃げ穴があった方が良い。すなわち、液晶
表示装置が飛行機等で空輸される場合、かなりの減圧状
態にさらされるため、完全密閉空間では内部の空気が著
しく膨張して液晶パネルに大きな曲げ変形を与えること
が考えられる。また、本実施例の液晶表示装置に於ける
小孔は、曲げ変形パラメーターＸが、Ｘ＜２．５mmを満
足できる範囲内で、小孔の大きさ，位置，形状，個数等
を任意に設定することができ、必ずしも筺体に設ける必
要はなく、例えばバツクライト側へ設けても良い。液晶
パネルのサイズが異なる場合でも、エアーダンパ作用を
有する範囲で小孔を自由に設定して良い。As described above, the substantially closed space 117 in this embodiment is indispensable for obtaining the air damper action, but it does not necessarily have to be a completely closed state, and there are small air escape holes or gaps. However, the above-mentioned air damper action is obtained. This usually takes 6 to 11 m during a drop impact.
Because it is a very short time of sec. Rather, in a preferred form, it is better to have an air escape hole such as a small hole rather than a completely closed space for the reason described below. That is, when the liquid crystal display device is air-shipped by an airplane or the like, it is exposed to a considerably reduced pressure, so that it is conceivable that the air inside expands significantly in the completely closed space and gives a large bending deformation to the liquid crystal panel. Further, the small holes in the liquid crystal display device of the present embodiment can be arbitrarily set in size, position, shape, number, etc. of the small holes within a range where the bending deformation parameter X satisfies X <2.5 mm. However, it is not always necessary to provide it on the housing, and it may be provided on the backlight side, for example. Even if the size of the liquid crystal panel is different, the small holes may be freely set within a range having an air damper function.
以上は略密閉空間１１７のエアーダンパとしての作用を
＋Ｚ方向の落下衝撃について説明したが、略密閉空間１
１７はその性質上−Ｚ方向の落下衝撃についても有効で
ある。すなわち−Ｚ方向に液晶パネル１００が衝撃を受
けて変位する際も、略密閉空間１１７は膨張を抑えるた
め液晶パネル全面に亙って均等に液晶パネルの曲げ変位
を抑える働きをする。従って、本発明の液晶表示装置
は、強誘電性液晶パネルの耐衝撃性が最も弱い±Ｚ方向
の落下衝撃に対して有効であるばかりでなく、振動に対
しても同様の効果を有している。The operation of the substantially closed space 117 as an air damper has been described above with respect to the drop impact in the + Z direction.
17 is also effective for a drop impact in the -Z direction due to its nature. That is, even when the liquid crystal panel 100 is displaced in the −Z direction due to an impact, the substantially sealed space 117 suppresses expansion, and thus functions to evenly suppress the bending displacement of the liquid crystal panel over the entire surface of the liquid crystal panel. Therefore, the liquid crystal display device of the present invention is not only effective against the drop impact in the ± Z direction, which has the weakest impact resistance of the ferroelectric liquid crystal panel, but also has the same effect against vibration. There is.
さらに本発明は、その構成上液晶パネル１００を筺体１
０８の上面に支持固定する必要がないため、液晶パネル
の配向劣化に対する筺体１０８の機械的強度依存は従来
例ほど大きくない。また、既に説明した再配向処理時に
液晶パネルが曲げ変形力を受けることもない。従って金
属筺体よりも剛性の小さいプラスチツク製筺体を使用す
ることが可能となる。また、従来例第８図の絶縁板８０
４も本実施例では不要である。また、本実施例では弾性
部材１１５としてゴム系のシリコン接着剤を用いたが、
これに限定されず、弾性を有する他のゴム部材を用いて
も良い。Further, in the present invention, due to its constitution, the liquid crystal panel 100
Since it is not necessary to support and fix it on the upper surface of 08, the mechanical strength dependence of the housing 108 with respect to the alignment deterioration of the liquid crystal panel is not so large as in the conventional example. Further, the liquid crystal panel is not subjected to the bending deformation force during the re-alignment processing which has already been described. Therefore, it is possible to use a plastic housing having a rigidity lower than that of the metal housing. Moreover, the insulating plate 80 of FIG.
4 is also unnecessary in this embodiment. Further, in this embodiment, a rubber-based silicone adhesive is used as the elastic member 115,
The present invention is not limited to this, and another rubber member having elasticity may be used.
第６図は本発明の第２の実施例を示す。図中、第１図と
同一の符号を付した部材は第１図と共通の部材である。
本実施例に於ては、弾性部材６０１が液晶パネル１００
の下面周辺部に直かに接して液晶パネル１００を支持し
ている。また拡散板１１０が第１図の支切板１１８の機
能を果している。この時、拡散板１１０はＺ方向に変位
しないようにバツクライト６０２に支持されている。さ
らにバツクライト６０２は第１の実施例の筺体１０８と
一体的にプラスチツクで形成されている。６０３は、液
晶パネル１００，バツクライトの開口窓部６０２−１，
拡散板１１０及び弾性部材６０１によって囲まれた略密
閉空間である。以上の構成に於ても第１の実施例と同様
な効果を得ることができる。このように第１図のパネル
支持基板１０７、仕切板１１８及び筺体１０８を除去あ
るいは他部材と一体化させることによって部品点数の削
減が可能となってコストダウンになるばかりでなく、液
晶表示装置の薄型化および重量を軽減することが可能で
ある。FIG. 6 shows a second embodiment of the present invention. In the figure, members designated by the same reference numerals as those in FIG. 1 are common to those in FIG.
In this embodiment, the elastic member 601 is the liquid crystal panel 100.
The liquid crystal panel 100 is supported by directly contacting the peripheral portion of the lower surface of the. Further, the diffusion plate 110 fulfills the function of the partition plate 118 shown in FIG. At this time, the diffusion plate 110 is supported by the back light 602 so as not to be displaced in the Z direction. Further, the back light 602 is integrally formed with the housing 108 of the first embodiment by plastic. Reference numeral 603 denotes a liquid crystal panel 100, a back light opening window portion 602-1.
It is a substantially enclosed space surrounded by the diffusion plate 110 and the elastic member 601. With the above structure, the same effect as that of the first embodiment can be obtained. As described above, by removing the panel support substrate 107, the partition plate 118 and the housing 108 of FIG. 1 or integrating them with other members, not only the number of parts can be reduced and the cost can be reduced, but also the liquid crystal display device It is possible to reduce the thickness and the weight.
以上は強誘電性液晶について主に耐衝撃性能の向上を説
明したが、本実施例の液晶パネル支持構造はネマチツク
液晶についても有用であることはいうまでもない。ま
た、本実施例は透過型の液晶表示装置に限定されるもの
ではなく、反射型の液晶表示装置についても有用であ
る。この場合は、第６図のバツクライト６０２が照明機
能を有さない支持部材となる。Although the above description has been mainly given to the improvement of the impact resistance performance of the ferroelectric liquid crystal, it goes without saying that the liquid crystal panel support structure of the present embodiment is also useful for the nematic liquid crystal. The present embodiment is not limited to the transmissive liquid crystal display device, but is also useful for a reflective liquid crystal display device. In this case, the backlight 602 shown in FIG. 6 serves as a support member having no illumination function.
以上説明したように、本発明によれば、 （１）液晶パネルを宙吊りに固定し、エアーダンパ作用
を利用できるため、液晶表示装置の輸送時や使用時に発
生する機械的外力、落下衝撃及び振動に対して液晶パネ
ルの配向劣化を防止することができ、強誘電性液晶を用
いた液晶表示装置の信頼性を飛躍的に向上することがで
きる。As described above, according to the present invention, (1) since the liquid crystal panel can be fixed in suspension and the air damper function can be utilized, mechanical external force, drop impact and vibration generated during transportation or use of the liquid crystal display device. On the other hand, alignment deterioration of the liquid crystal panel can be prevented, and the reliability of the liquid crystal display device using the ferroelectric liquid crystal can be dramatically improved.
（２）特に、大版サイズの強誘電性液晶パネルの実用化
に有効である。(2) In particular, it is effective for practical application of a large-sized ferroelectric liquid crystal panel.
（３）液晶パネルを宙吊りに固定した構造のため、液晶
パネル組立時に於ける機械的な外部負荷による液晶パネ
ルの変形を最小限にとどめることができ、確実に強誘電
性液晶パネルを固定できる。(3) Since the liquid crystal panel is suspended and fixed, the deformation of the liquid crystal panel due to a mechanical external load at the time of assembling the liquid crystal panel can be minimized, and the ferroelectric liquid crystal panel can be securely fixed.
（４）プラスチツク筺体あるいは非金属筺体が使用でき
るため、コストダウン及び軽量化の効果が大きい。(4) Since a plastic housing or a non-metal housing can be used, the effects of cost reduction and weight reduction are great.
（５）液晶表示装置を使用中に、何らかの異常で液晶パ
ネルの画質が劣化した場合、液晶パネルが筺体に組み付
けられたままの状態で再配向処理をすることが可能とな
り、装置の保守性向上が計れる等の効果が得られる。(5) When the image quality of the liquid crystal panel is deteriorated due to some abnormality during use of the liquid crystal display device, the liquid crystal panel can be re-aligned while it is still attached to the housing, improving the maintainability of the device. The effect of being able to measure is obtained.
第１図は本発明の液晶表示装置の断面図、 第２図は強誘電性液晶パネルの層構造の変化を示す拡大
断面図、 第３図は従来の液晶表示装置が落下衝撃を受けた時の液
晶パネルの変形状態を示す断面図、 第４図は本発明の液晶表示装置が落下衝撃を受けた時の
液晶パネルの変形状態の特徴を示す断面図、 第５図はエアーダンパ作用の効果を示す特性図、 第６図は本発明の第２の実施例を示す液晶表示装置の断
面図、 第７図及び第８図は従来の液晶表示装置の断面図であ
る。 １００；液晶パネル、１１６；小孔 １０３；上偏光板、１１７；略密閉空間 １０４；下偏光板、１１８；仕切板 １０６；回路基板、２０１；強誘電性液晶 １０７；パネル支持基板、６０１；弾性部材 １０８；筺体、６０２；バツクライト １０９；バツクライト、６０３；略密閉空間 １１０；拡散板、７００フレーム １１１；保護ガラス、７０２；回路基板 １１２；上カバー、７０６；導電ゴムコネクタ １１３；下カバー、８０１；筺体 １１５；弾性部材、８０６；接着剤FIG. 1 is a cross-sectional view of a liquid crystal display device of the present invention, FIG. 2 is an enlarged cross-sectional view showing a change in the layer structure of a ferroelectric liquid crystal panel, and FIG. 3 is a conventional liquid crystal display device when it receives a drop impact. 4 is a sectional view showing the deformed state of the liquid crystal panel, FIG. 4 is a sectional view showing the characteristic of the deformed state of the liquid crystal panel when the liquid crystal display device of the present invention is subjected to a drop impact, and FIG. 5 is the effect of the air damper action. FIG. 6 is a sectional view of a liquid crystal display device showing a second embodiment of the present invention, and FIGS. 7 and 8 are sectional views of a conventional liquid crystal display device. 100; liquid crystal panel, 116; small hole 103; upper polarizing plate 117; substantially closed space 104; lower polarizing plate, 118; partition plate 106; circuit board, 201; ferroelectric liquid crystal 107; panel supporting substrate, 601; elasticity Member 108; Housing, 602; Backlite 109; Backlite, 603; Substantially closed space 110; Diffusion plate, 700 frame 111; Protective glass, 702; Circuit board 112; Top cover, 706; Conductive rubber connector 113; Bottom cover, 801; Housing 115; elastic member, 806; adhesive
Claims (14)
に配置した液晶とを有する液晶パネル、 ｂ．該液晶パネルを支持する支持部材及び、 ｃ．該液晶パネルを該支持部材の開口部に宙吊りに固定
する弾性部材 を有し、該液晶パネル，該支持部材および該弾性部材と
で囲まれた空間が略密閉空間であることを特徴とする液
晶表示装置。1. A. A liquid crystal panel having a pair of substrates provided with electrodes and a liquid crystal disposed between the substrates, b. A support member for supporting the liquid crystal panel, and c. A liquid crystal having an elastic member for fixing the liquid crystal panel to an opening of the support member in a suspended manner, and a space surrounded by the liquid crystal panel, the support member and the elastic member is a substantially closed space. Display device.
明するバツクライトを備え、前記液晶パネル，前記支持
部材，前記弾性部材及び該バツクライトで囲まれた空間
が略密閉空間であることを特徴とする請求項第１項記載
の液晶表示装置。2. A back light for illuminating the liquid crystal panel is provided below the support member, and a space surrounded by the liquid crystal panel, the support member, the elastic member and the back light is a substantially closed space. The liquid crystal display device according to claim 1.
とを特徴とする請求項第１項記載の液晶表示装置。3. The liquid crystal display device according to claim 1, wherein the support member has an air escape portion.
特徴とする請求項第１項記載の液晶表示装置。4. The liquid crystal display device according to claim 1, wherein the support member is a plastic.
を特徴とする請求項第１項記載の液晶表示装置。5. The liquid crystal display device according to claim 1, wherein the elastic member is a rubber adhesive.
とする請求項第１項記載の液晶表示装置。6. The liquid crystal display device according to claim 1, wherein the liquid crystal is a ferroelectric liquid crystal.
液晶であることを特徴とする請求項第１項記載の液晶表
示装置。7. The liquid crystal display device according to claim 1, wherein the ferroelectric liquid crystal is a chiral smectic liquid crystal.
に配置した液晶とを有する液晶パネル、 ｂ．該液晶パネルを支持するパネル支持基板、 ｃ．該パネル支持基板を支持する支持部材及び ｄ．該パネル支持基板を該支持部材の開口部に宙吊りに
固定する弾性部材 を有し、該パネル支持基板，該支持部材及び該弾性部材
とで囲まれた空間が略密閉空間であることを特徴とする
液晶表示装置。8. A. A liquid crystal panel having a pair of substrates provided with electrodes and a liquid crystal disposed between the substrates, b. A panel support substrate that supports the liquid crystal panel, c. A support member for supporting the panel support substrate, and d. An elastic member for suspending the panel supporting substrate in an opening of the supporting member, and a space surrounded by the panel supporting substrate, the supporting member and the elastic member is a substantially closed space. Liquid crystal display device.
明するバツクライトを備え、前記液晶パネル，前記支持
部材，前記弾性部材及び該バツクライトで囲まれた空間
が略密閉空間であることを特徴とする請求項第８項記載
の液晶表示装置。9. A back light for illuminating the liquid crystal panel is provided below the support member, and a space surrounded by the liquid crystal panel, the support member, the elastic member and the back light is a substantially closed space. The liquid crystal display device according to claim 8.
ことを特徴とする請求項第８項記載の液晶表示装置。10. The liquid crystal display device according to claim 8, wherein the support member has an air escape portion.
を特徴とする請求項第８項記載の液晶表示装置。11. The liquid crystal display device according to claim 8, wherein the support member is a plastic.
とを特徴とする請求項第８項記載の液晶表示装置。12. The liquid crystal display device according to claim 8, wherein the elastic member is a rubber adhesive.
徴とする請求項第８項記載の液晶表示装置。13. The liquid crystal display device according to claim 8, wherein the liquid crystal is a ferroelectric liquid crystal.
ク液晶であることを特徴とする請求項第８項記載の液晶
表示装置。14. The liquid crystal display device according to claim 8, wherein the ferroelectric liquid crystal is a chiral smectic liquid crystal.
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34313289A JPH0636132B2 (en) | 1989-12-29 | 1989-12-29 | Liquid crystal display |
| US07/634,740 US5150231A (en) | 1989-12-29 | 1990-12-27 | Impact resistant ferroelectric liquid crystal apparatus |
| DK90125758.4T DK0435343T3 (en) | 1989-12-29 | 1990-12-28 | Liquid crystal device |
| ES90125758T ES2076289T3 (en) | 1989-12-29 | 1990-12-28 | LIQUID GLASS DEVICE. |
| DE69032997T DE69032997T2 (en) | 1989-12-29 | 1990-12-28 | Liquid crystal apparatus |
| AT93120672T ATE177542T1 (en) | 1989-12-29 | 1990-12-28 | LIQUID CRYSTAL APPARATUS |
| EP90125758A EP0435343B1 (en) | 1989-12-29 | 1990-12-28 | Liquid crystal apparatus |
| AT90125758T ATE127595T1 (en) | 1989-12-29 | 1990-12-28 | LIQUID CRYSTAL APPARATUS. |
| EP93120672A EP0595372B1 (en) | 1989-12-29 | 1990-12-28 | Liquid crystal apparatus |
| DE69022200T DE69022200T2 (en) | 1989-12-29 | 1990-12-28 | Liquid crystal apparatus. |
| KR1019900022371A KR960002204B1 (en) | 1989-12-29 | 1990-12-29 | Liquid crystal devices |
| US08/264,232 US5710607A (en) | 1989-12-29 | 1994-06-22 | Impact resistant liquid crystal apparatus |
| GR950403425T GR3018306T3 (en) | 1989-12-29 | 1995-12-05 | Liquid crystal apparatus. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34313289A JPH0636132B2 (en) | 1989-12-29 | 1989-12-29 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03203773A JPH03203773A (en) | 1991-09-05 |
| JPH0636132B2 true JPH0636132B2 (en) | 1994-05-11 |
Family
ID=18359164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34313289A Expired - Fee Related JPH0636132B2 (en) | 1989-12-29 | 1989-12-29 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636132B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11180645B2 (en) | 2015-05-08 | 2021-11-23 | Dow Global Technologies Llc | Process for foaming polyolefin compositions using an azodicarbonamide/citrate mixture as a nucleating agent |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2754833B2 (en) * | 1990-02-20 | 1998-05-20 | 松下電器産業株式会社 | Ferroelectric liquid crystal device |
| JP2808962B2 (en) * | 1991-08-19 | 1998-10-08 | 松下電器産業株式会社 | Liquid crystal panel alignment defect suppression method and display device |
| EP0638832B1 (en) * | 1993-08-10 | 2000-03-22 | Canon Kabushiki Kaisha | Liquid crystal display apparatus |
| JP3215844B2 (en) | 1995-04-18 | 2001-10-09 | キヤノン株式会社 | Display device and method of manufacturing the display device |
| US7066234B2 (en) | 2001-04-25 | 2006-06-27 | Alcove Surfaces Gmbh | Stamping tool, casting mold and methods for structuring a surface of a work piece |
| CN101946271B (en) * | 2008-02-22 | 2013-11-20 | 夏普株式会社 | Display device |
| JP2013104969A (en) * | 2011-11-11 | 2013-05-30 | Japan Display West Co Ltd | Display device |
-
1989
- 1989-12-29 JP JP34313289A patent/JPH0636132B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11180645B2 (en) | 2015-05-08 | 2021-11-23 | Dow Global Technologies Llc | Process for foaming polyolefin compositions using an azodicarbonamide/citrate mixture as a nucleating agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03203773A (en) | 1991-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |