JPH05264978A - Ferroelectric liquid crystal display device - Google Patents
Ferroelectric liquid crystal display deviceInfo
- Publication number
- JPH05264978A JPH05264978A JP9336992A JP9336992A JPH05264978A JP H05264978 A JPH05264978 A JP H05264978A JP 9336992 A JP9336992 A JP 9336992A JP 9336992 A JP9336992 A JP 9336992A JP H05264978 A JPH05264978 A JP H05264978A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- substrate
- crystal display
- ferroelectric liquid
- ferroelectric
- 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.)
- Granted
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
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/141—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent using ferroelectric liquid crystals
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は強誘電性液晶表示素子に
関し、特に外部から加わる衝撃や圧力に強い強誘電性液
晶表示素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferroelectric liquid crystal display element, and more particularly to a ferroelectric liquid crystal display element that is resistant to external impact and pressure.
【０００２】[0002]
【従来の技術】近年、液晶材料として強誘電性液晶を用
い、これを高度に配向制御し、かつこの液晶材料を電極
が配設された二枚の基板に挾持してなる液晶光学素子
が、電界等の外部刺激に対して高速応答するとともに、
コントラスト比等に優れるなどの優れた特性を有するこ
となどから注目され、液晶表示素子、液晶記憶素子等と
して盛んに研究されるようになってきた。上述した強誘
電性液晶は、素子機能を維持するためには液晶分子が層
構造をなして安定に配向している必要がある。しかし、
液晶に外部から衝撃や圧力が加わると液晶分子の配向が
乱れ、特に強誘電性低分子液晶は衝撃や圧力が加わると
簡単に分子配向が乱れ、表示機能を損なうという問題が
あった。また、強誘電性低分子液晶における液晶の分子
配向の乱れは自己復帰させることができないため永久的
な欠陥となってしまう。2. Description of the Related Art In recent years, a liquid crystal optical element has been used, in which a ferroelectric liquid crystal is used as a liquid crystal material, the orientation of which is highly controlled, and the liquid crystal material is sandwiched between two substrates provided with electrodes. It responds quickly to external stimuli such as electric fields,
Due to its excellent characteristics such as excellent contrast ratio, it has been actively researched as a liquid crystal display device, a liquid crystal memory device, and the like. In the above-mentioned ferroelectric liquid crystal, liquid crystal molecules need to form a layered structure and be stably aligned in order to maintain the device function. But,
There is a problem that the alignment of liquid crystal molecules is disturbed when an external shock or pressure is applied to the liquid crystal, and especially the ferroelectric low-molecular liquid crystal is easily disturbed when the shock or pressure is applied and the display function is impaired. Further, the disorder of the molecular orientation of the liquid crystal in the ferroelectric low-molecular liquid crystal cannot be self-recovered and becomes a permanent defect.
【０００３】[0003]
【発明が解決しようとする課題】上記の事情にかんが
み、液晶分子の配向に乱れが生じないようにするため、
例えば特開平２−２１４８２１号では、支持台と液晶パ
ネルとの間にクッション材を設け、衝撃を吸収する構造
としてあり、また特開平３−１５２５１３号では、パネ
ルの接着層（封止部分）にシリコン樹脂を用い、この部
分で衝撃を吸収する構造としてある。しかし、特開平２
−２１４８２１号のものは、表示窓を有する支持台の形
状が複雑で、加工が煩雑という問題があり、またガラス
板を使用しているため割れやすく危険性をともなうとい
う問題があった。また、特開平３−１５２５１３号のも
のは、パネルが小さい場合は、外周部にある接着層で衝
撃を吸収できるが、パネルが大きくなるとパネル中央部
での衝撃を吸収できなくなるという問題があった。さら
に、従来の液晶表示素子は、基板に防眩加工を施してな
いため、表示面が反射しやすく、特に表示面を曲面にす
ると光の反射が激しく、非常に読み取りにくく、目の疲
労も大きくなるという問題があった。In view of the above circumstances, in order to prevent the alignment of liquid crystal molecules from being disturbed,
For example, in JP-A-2-214821, a cushion material is provided between a support and a liquid crystal panel to absorb a shock, and in JP-A-3-152513, an adhesive layer (sealing portion) of the panel is provided. Silicon resin is used, and this structure has a structure that absorbs shock. However, JP-A-2
-214821 has a problem that the shape of a support having a display window is complicated and processing is complicated, and since a glass plate is used, it is easily cracked and poses a risk. Further, in JP-A-3-152513, when the panel is small, the impact can be absorbed by the adhesive layer on the outer peripheral portion, but when the panel is large, there is a problem that the impact cannot be absorbed in the central portion of the panel. .. Further, in the conventional liquid crystal display element, since the substrate is not subjected to the anti-glare process, the display surface is easily reflected, and particularly when the display surface is a curved surface, the light is strongly reflected, which makes it very difficult to read and causes great eye fatigue. There was a problem of becoming.
【０００４】本発明は上記の問題点を解決すべくなされ
たものであり、機械的な耐衝撃性を高めることにより分
子配向の乱れを防止して表示性能の向上を図るととも
に、表示側基板に防眩加工を施して表示面の光の反射を
防止した強誘電性液晶表示素子の提供を目的とする。ま
た、耐衝撃性の向上を樹脂基板等を用いて達成すること
により、形態の自由性を確保した強誘電性液晶表示素子
の提供を目的とする。The present invention has been made to solve the above-mentioned problems, and by improving mechanical shock resistance, disorder of molecular orientation is prevented, display performance is improved, and a display side substrate is provided. An object of the present invention is to provide a ferroelectric liquid crystal display element that is anti-glare processed to prevent reflection of light on the display surface. Another object of the present invention is to provide a ferroelectric liquid crystal display element in which the flexibility of the form is secured by achieving improvement of impact resistance by using a resin substrate or the like.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本発明の強誘電性液晶表示素子は、透明導電膜を有する
二枚の透明樹脂基板の間に強誘電性液晶を挾持した液晶
表示素子において、上記二枚の透明樹脂基板のうち表示
側基板を０．２〜５ｍｍの厚さの板状基板とするか、も
しくは０．２ｍｍ以下の曲げ剛性率の高い部材で形成
し、裏側基板を０．２ｍｍ以下の強誘電性液晶表示素子
としてある。また、本発明の強誘電性液晶表示素子は、
透明導電膜を有する二枚の透明樹脂基板の間に強誘電性
液晶を挾持した液晶表示素子において、上記二枚の透明
樹脂板を０．２ｍｍ以下の可撓性フィルム状基板とする
とともに、表示側基板の表示側面に透明性を有する弾性
部材で保護層を形成する構成としてある。さらに、本発
明の強誘電性液晶表示素子は、透明導電膜を有する二枚
の透明樹脂基板の間に強誘電性液晶を挾持した液晶表示
素子において、上記二枚の透明樹脂基板のうち裏側基板
と支持部材との間に衝撃吸収層を形成する構成としてあ
る。またさらに、本発明の強誘電性液晶表示素子は、透
明導電膜を有する二枚の透明樹脂基板の間に強誘電性液
晶を挾持した液晶表示素子において、上記二枚の透明樹
脂基板のうち表示側基板の表面に防眩加工を施した構成
としてある。In order to achieve the above object, a ferroelectric liquid crystal display device of the present invention is a liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film. In the above-mentioned two transparent resin substrates, the display-side substrate is a plate-shaped substrate having a thickness of 0.2 to 5 mm, or is formed of a member having a high bending rigidity of 0.2 mm or less, and the back-side substrate is It is a ferroelectric liquid crystal display device having a thickness of 0.2 mm or less. Further, the ferroelectric liquid crystal display element of the present invention,
In a liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film, the two transparent resin plates are flexible film substrates of 0.2 mm or less, and display The protective layer is formed on the display side surface of the side substrate with a transparent elastic member. Further, the ferroelectric liquid crystal display element of the present invention is a liquid crystal display element in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film, wherein a back substrate of the two transparent resin substrates is used. A shock absorbing layer is formed between the support member and the support member. Still further, the ferroelectric liquid crystal display device of the present invention is a liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film, and a display of the two transparent resin substrates is performed. The surface of the side substrate is antiglare.
【０００６】上記構成からなる強誘電性液晶表示素子に
よれば、強誘電性液晶表示素子の表示面側から直接衝撃
や圧力が加わっても、これらは表示側基板もしくは表示
側基板の上部に形成した保護層で遮られて強誘電性液晶
表示素子に悪影響を与えない。また、強誘電性液晶表示
素子を取り付けた装置に圧力や衝撃が加わった場合に
は、裏側基板と装置の支持部材との間に設けた衝撃吸収
材によって衝撃が吸収され強誘電性液晶表示素子まで伝
わらない。したがって、分子配向に乱れを生じない。ま
た、表示面が曲面であっても光が反射せず、表示内容を
読み取りやすい。According to the ferroelectric liquid crystal display element having the above structure, even if a shock or pressure is directly applied from the display surface side of the ferroelectric liquid crystal display element, these are formed on the display side substrate or on the display side substrate. The protective layer prevents the ferroelectric liquid crystal display element from being adversely affected. Further, when pressure or shock is applied to the device to which the ferroelectric liquid crystal display element is attached, the shock is absorbed by the shock absorbing material provided between the back side substrate and the supporting member of the device, and the ferroelectric liquid crystal display element. I can't reach you. Therefore, the molecular orientation is not disturbed. In addition, even if the display surface is a curved surface, light is not reflected, and the display content is easy to read.
【０００７】以下、本発明の強誘電性液晶表示素子を詳
細に説明する。図１は本発明の第一実施例態様を示し、
強誘電性液晶１を二枚の樹脂基板２，３で挾持し、表示
側基板２を０．２〜５ｍｍの厚さとし、裏側基板３を
０．２ｍｍ以下の厚さとしてある。The ferroelectric liquid crystal display device of the present invention will be described in detail below. FIG. 1 shows a first embodiment of the present invention,
The ferroelectric liquid crystal 1 is sandwiched between two resin substrates 2 and 3, the display side substrate 2 has a thickness of 0.2 to 5 mm, and the back side substrate 3 has a thickness of 0.2 mm or less.
【０００８】二枚の基板２，３に挾持される液晶材料１
は特に制限されないが、強誘電性液晶材料を用いること
が好ましい。強誘電性の液晶状態をとるものとしては、
強誘電性低分子液晶、強誘電性高分子液晶、又はこれら
の混合物などが挙げられる。ここで、強誘電性低分子液
晶としては、例えば、一種又は二種以上の強誘電性低分
子液晶、一種又は二種以上の強誘電性低分子液晶と他の
低分子液晶等の混合物からなる強誘電性低分子液晶など
を挙げることができる。また、強誘電性高分子液晶とし
ては、例えば、一種又は二種以上の強誘電性高分子液
晶、一種又は二種以上の強誘電性低分子液晶と一種又は
二種以上の強誘電性高分子液晶からなる強誘電性高分子
液晶、一種又は二種以上の強誘電性低分子液晶と一種又
は二種以上の他の高分子液晶等からなる強誘電性高分子
液晶などを挙げることができる。すなわち、前記強誘電
性高分子液晶としては、ポリマー分子自体が強誘電性の
液晶特性を示す強誘電性高分子液晶（ホモポリマーまた
はコポリマーまたはそれらの混合物）、強誘電性高分子
液晶と他の高分子液晶及び／又は通常のポリマーとの混
合物、強誘電性高分子液晶と強誘電性低分子液晶との混
合物、強誘電性高分子液晶と強誘電性低分子液晶と高分
子液晶及び／又は通常のポリマーとの混合物、あるい
は、これらと通常の低分子液晶との混合物などの、すべ
ての強誘電性を示す高分子液晶を使用することができ
る。前記強誘電性高分子液晶の中でも、例えば、カイラ
ルスメクチックＣ相をとる側鎖型強誘電性高分子液晶が
好適に使用される。A liquid crystal material 1 held between two substrates 2 and 3.
Is not particularly limited, but it is preferable to use a ferroelectric liquid crystal material. As the one that takes the ferroelectric liquid crystal state,
Examples include ferroelectric low-molecular liquid crystals, ferroelectric high-molecular liquid crystals, and mixtures thereof. Here, the ferroelectric low-molecular liquid crystal includes, for example, one or more kinds of ferroelectric low-molecular liquid crystals, and a mixture of one or more kinds of ferroelectric low-molecular liquid crystals and other low-molecular liquid crystals. Ferroelectric low-molecular liquid crystals and the like can be mentioned. Examples of the ferroelectric polymer liquid crystal include, for example, one or more kinds of ferroelectric polymer liquid crystals, one or more kinds of ferroelectric low-molecular liquid crystals, and one or more kinds of ferroelectric polymers. Examples thereof include a ferroelectric polymer liquid crystal composed of liquid crystal, a ferroelectric polymer liquid crystal composed of one or more kinds of ferroelectric low molecular liquid crystal, and one or more kinds of other polymer liquid crystal. That is, as the ferroelectric polymer liquid crystal, ferroelectric polymer liquid crystal (homopolymer or copolymer or mixture thereof) in which polymer molecules themselves exhibit ferroelectric liquid crystal characteristics, ferroelectric polymer liquid crystal and other Mixture of high molecular liquid crystal and / or ordinary polymer, mixture of ferroelectric high molecular liquid crystal and ferroelectric low molecular liquid crystal, ferroelectric high molecular liquid crystal, ferroelectric low molecular liquid crystal and high molecular liquid crystal, and / or Polymeric liquid crystals exhibiting all ferroelectric properties can be used, such as mixtures with common polymers or mixtures of these with normal low-molecular liquid crystals. Among the ferroelectric polymer liquid crystals, for example, a side chain type ferroelectric polymer liquid crystal having a chiral smectic C phase is preferably used.
【０００９】強誘電性液晶化合物の例としては、デシロ
キシベンジリデン−Ｐ’−アミノ−２−メチルブチルシ
ンナメート（ＤＯＢＡＭＢＣ）、ヘキシルオキシベンジ
リデン−Ｐ’−アミノ−２−クロロプロピルシンナメー
ト（ＨＯＢＡＣＰＣ）および４−ｏ−（２−メチル）−
ブチルレゾルシリデン−４’−オクチルアニリン（ＭＢ
ＲＡ８）等が挙げられる。これらの材料を用いて、素子
を構成する場合、液晶化合物が、ＳｍＣ＊相又はＳｍＨ
＊相となるような温度状態に保持する、必要に応じて素
子をヒーターが埋め込まれた銅ブロック等により支持す
ることができる。また、本発明では前述のＳｍＣ＊，Ｓ
ｍＨ＊の他にカイラルスメクチックＦ相，Ｉ相，Ｊ相，
Ｇ相やＫ相で現われる強誘電性液晶を用いることも可能
である。また、強誘電性液晶組成物には、必要に応じ
て、接着剤，減粘剤，非液晶カイラル化合物，色素等が
含まれる。液晶層の厚さは、特に制限されないが２〜４
μｍとするのが好ましい。Examples of ferroelectric liquid crystal compounds include desiloxybenzylidene-P'-amino-2-methylbutylcinnamate (DOBAMBC), hexyloxybenzylidene-P'-amino-2-chloropropylcinnamate (HOBACPC). And 4-o- (2-methyl)-
Butyl resorcylidene-4'-octylaniline (MB
RA8) and the like. When a device is formed using these materials, the liquid crystal compound is SmC * phase or SmH
* If necessary, the element can be supported by a copper block or the like in which a heater is embedded, which is maintained in a temperature state in which the phases are established. Further, in the present invention, the aforementioned SmC *, S
In addition to mH *, chiral smectic F phase, I phase, J phase,
It is also possible to use a ferroelectric liquid crystal that appears in the G phase or the K phase. Further, the ferroelectric liquid crystal composition may contain an adhesive, a viscosity reducing agent, a non-liquid crystal chiral compound, a dye, etc., if necessary. The thickness of the liquid crystal layer is not particularly limited, but is 2 to 4
The thickness is preferably μm.
【００１０】表示側の基板２としては、ポリエーテルス
ルホン，ポリアリレート，芳香族ポリエステル，ポリエ
ーテルイミド，ポリイミド，ポリカーボネート，ポリエ
ステル及びエポキシ樹脂等の透明性を有する高分子材料
を用い、その厚さは０．２〜５ｍｍ、パネルの視野特性
の観点からすると、０．５〜２ｍｍとすることが好まし
い。For the substrate 2 on the display side, a transparent polymer material such as polyether sulfone, polyarylate, aromatic polyester, polyetherimide, polyimide, polycarbonate, polyester and epoxy resin is used, and its thickness is 0.2 to 5 mm, and preferably 0.5 to 2 mm from the viewpoint of the visual field characteristics of the panel.
【００１１】また、表示側と反対の裏側の基板３として
は、０．２ｍｍ以下の可撓性フィルムからなる樹脂基板
を用いる。この樹脂基板としては、可撓性を有し透明性
の材料であれば、特に制限はない。例えば、ポリエチレ
ンテレフタレート（ＰＥＴ）、ポリエーテルスルホン
（ＰＥＳ）、ポリカーボネート（ＰＣ）などのプラスチ
ックフィルムなどを用いることができる。基板の厚みは
０．２ｍｍ以下であればよいが、好ましくは、１０μｍ
〜０．２ｍｍとする。As the substrate 3 on the back side opposite to the display side, a resin substrate made of a flexible film of 0.2 mm or less is used. The resin substrate is not particularly limited as long as it is a flexible and transparent material. For example, a plastic film such as polyethylene terephthalate (PET), polyether sulfone (PES), or polycarbonate (PC) can be used. The thickness of the substrate may be 0.2 mm or less, preferably 10 μm
~ 0.2 mm.
【００１２】基板２，３の液晶材１側の片面には電極
（図示せず）が設けられているが、電極としては、透明
性を有する材料であれば特に制限されない。例えば、酸
化インジウム又は酸化インジウムと酸化錫との混合物か
らなるＩＴＯ膜等の透明電極が好適であり、通常これら
は上記の可撓性基板上に蒸着される。An electrode (not shown) is provided on one surface of the substrates 2 and 3 on the liquid crystal material 1 side, but the electrode is not particularly limited as long as it is a transparent material. For example, a transparent electrode such as an ITO film made of indium oxide or a mixture of indium oxide and tin oxide is suitable, and these are usually deposited on the above flexible substrate.
【００１３】図２は、表示側基板２を曲げ剛性率の大き
い基板で形成した本発明の第二実施例態様を示す。曲げ
剛性率（曲げ強さ）の大きい基板材料としては、エポキ
シ，ポリカーボネート，ポリエーテルイミド，ポリイミ
ド及びポリアクリレート等の透明性を有し、曲げ弾性率
の大きい高分子材料を用いる。この場合、基板２の曲げ
強さは、曲げ応力による基板の変形量が小さいというこ
とからすると３００Ｋｇｆ／ｍｍ2 以上とすることが好
ましく、また基板３の厚さは、０．２ｍｍ以下とするこ
とが好ましい。FIG. 2 shows a second embodiment of the present invention in which the display side substrate 2 is formed of a substrate having a large bending rigidity. As a substrate material having a large flexural rigidity (flexural strength), a polymer material having transparency and a large flexural modulus such as epoxy, polycarbonate, polyetherimide, polyimide and polyacrylate is used. In this case, the bending strength of the substrate 2 is preferably 300 Kgf / mm 2 or more in view of the small amount of deformation of the substrate due to bending stress, and the thickness of the substrate 3 is 0.2 mm or less. Is preferred.
【００１４】図３は表示側基板２の表示側面に透明弾性
部材からなる保護層４を形成した本発明の第三実施例態
様を示す。保護層４を形成する透明性を備えた弾性部材
としては、シリコン系ゴムあるいはフッ素系ゴム等から
なる透明性を有するシート状のものを用いる。この場
合、保護層４をあまり厚くすると透明性が低下するの
で、１〜５ｍｍ程度の厚さとすることが好ましい。ま
た、保護層４を形成する場合には、表示側の基板２とし
て、裏側基板３と同様の０．２ｍｍ以下の厚さからなる
可撓性樹脂シートを用いればよい。FIG. 3 shows a third embodiment of the present invention in which a protective layer 4 made of a transparent elastic member is formed on the display side surface of the display side substrate 2. As the transparent elastic member forming the protective layer 4, a transparent sheet-shaped member made of silicon rubber or fluorine rubber is used. In this case, if the protective layer 4 is made too thick, the transparency decreases, so it is preferable to set the thickness to about 1 to 5 mm. When the protective layer 4 is formed, a flexible resin sheet having a thickness of 0.2 mm or less, which is the same as the back substrate 3, may be used as the display substrate 2.
【００１５】図４は、強誘電性液晶表示素子を組み込ん
だ装置ケースの支持部材６との間に衝撃吸収層５を形成
した本発明の第四実施態様を示す。この実施態様は、強
誘電性液晶表示素子を組み込んだ装置側から強誘電性液
晶表示素子に衝撃や圧力が加わらないようにしたもので
ある。衝撃吸収層５としては、特に制限されず、発泡ウ
レタン，ゴム等の弾性部材を用いることができる。この
場合、強誘電性液晶表示素子の裏側基板３としては上述
の可撓性樹脂からなるフィルム状の基板を用いればよ
い。一方、表示側基板２としては、裏側基板３と同様の
基板を用いることができるが、上述した第一ないし第三
実施態様で説明した基板あるいは保護層を利用してもよ
く、このようにすると、強誘電性液晶表示素子に加わる
直接的及び間接的な衝撃や圧力から強誘電性液晶表示素
子を保護することが可能となる。FIG. 4 shows a fourth embodiment of the present invention in which a shock absorbing layer 5 is formed between a ferroelectric liquid crystal display element and a supporting member 6 of a device case. In this embodiment, an impact or pressure is not applied to the ferroelectric liquid crystal display element from the side of the device incorporating the ferroelectric liquid crystal display element. The shock absorbing layer 5 is not particularly limited, and elastic members such as urethane foam and rubber can be used. In this case, as the back side substrate 3 of the ferroelectric liquid crystal display element, a film-like substrate made of the above-mentioned flexible resin may be used. On the other hand, as the display-side substrate 2, the same substrate as the back-side substrate 3 can be used, but the substrate or protective layer described in the first to third embodiments described above may be used. It is possible to protect the ferroelectric liquid crystal display element from direct and indirect impacts and pressures applied to the ferroelectric liquid crystal display element.
【００１６】表示側基板２は、強誘電性液晶表示素子の
用途に応じて、光の反射を防ぎ防眩効果をもたせるよう
にすることもできる。例えば、基板２の表面にサンドブ
ラスト等によって粗面加工を施し数μｍ程度の微小な起
伏をもたせたり、基板２の表面に防眩加工された透明フ
ィルムを貼り付けたり、微小なガラスビーズを基板材料
に練り込ませたりして、表示側基板２に防眩効果をもた
せる。このようにすると、照明等からの反射光を防ぐこ
とができ表示が見やすくなる。なお、上述した第一ない
し第四の実施例態様における強誘電性液晶表示素子の表
示側基板２に、このような防眩加工を行なえることは勿
論である。The display-side substrate 2 can prevent light reflection and have an antiglare effect depending on the application of the ferroelectric liquid crystal display element. For example, the surface of the substrate 2 is roughened by sandblasting or the like to have a fine relief of about several μm, a transparent film having an antiglare process is attached to the surface of the substrate 2, or minute glass beads are used as a substrate material. The substrate 2 on the display side has an antiglare effect. This makes it possible to prevent reflected light from the illumination or the like and make the display easier to see. It is needless to say that the display-side substrate 2 of the ferroelectric liquid crystal display element in the above-mentioned first to fourth embodiments can be subjected to such an antiglare process.
【００１７】このように、液晶材１及び基板２，３を樹
脂で形成した本発明の強誘電性液晶表示素子は、耐衝撃
性等に優れるだけでなく、強誘電性液晶表示素子の形態
をいろいろと変化させることができ、またガラスを用い
てないことにより安全性も向上する。As described above, the ferroelectric liquid crystal display device of the present invention in which the liquid crystal material 1 and the substrates 2 and 3 are made of resin is not only excellent in impact resistance and the like, but also has the form of a ferroelectric liquid crystal display device. It can be changed in various ways, and the safety is improved by not using glass.
【００１８】次に、液晶表示素子の製造方法について説
明する。液晶材１の基板への塗布は、液晶材料を溶媒で
溶いたり加熱したりすることにより、流動性を高め、こ
れをマイクログラビア法、ダイレクトグラビア法等によ
り、電極付き基板の電極側の表面に均一な膜厚に塗布す
る方法が適する。また、流動性を高めた液晶材料を岩石
部材に含浸させ、この含浸部材を電極付き基板の電極側
の表面に押し当てて移動しながら塗布する含浸塗布法
（特開平２−１０３２２号公報記載）も好適である。液
晶の塗布は通常、可撓性を有する裏側基板３へ行なう。Next, a method of manufacturing the liquid crystal display element will be described. The liquid crystal material 1 is applied to the substrate by dissolving the liquid crystal material in a solvent or heating the liquid crystal material to enhance the fluidity, and by applying the liquid gravure method or the direct gravure method to the electrode side surface of the substrate with electrodes. A method of applying a uniform film thickness is suitable. In addition, an impregnation coating method in which a rock member is impregnated with a liquid crystal material having improved fluidity, and the impregnated member is pressed against an electrode-side surface of a substrate with an electrode to apply while moving (JP-A-2-10322). Is also suitable. Liquid crystal is usually applied to the flexible back substrate 3.
【００１９】次いで、基板の重ね合わせ工程では、形成
された液晶層１の上に、もう一方の表示側基板２を、液
晶層１と表示側基板２の電極側の表面とが接するように
重ね合わせる。そして、重ね合わせる基板２と液晶層１
の間に気泡が入らないように上下の基板２，３を重ね合
わせ、上下の基板２，３により液晶層１を均一な膜厚で
挾持する。このとき、重ね合わせる基板２を加熱するこ
とが好ましい。Next, in the substrate superposing step, the other display side substrate 2 is placed on the formed liquid crystal layer 1 so that the liquid crystal layer 1 and the electrode side surface of the display side substrate 2 are in contact with each other. To match. Then, the substrate 2 and the liquid crystal layer 1 which are overlapped with each other
The upper and lower substrates 2 and 3 are superposed so that air bubbles do not enter between them, and the upper and lower substrates 2 and 3 sandwich the liquid crystal layer 1 with a uniform film thickness. At this time, it is preferable to heat the superposed substrates 2.
【００２０】液晶材料は電極付き基板間に挾持される際
又はその後配向処理され、液晶組成物の液晶分子が一軸
水平配向していることが好ましい。配向処理の方法とし
ては、特に制限はなく、例えば、従来から良く知られた
ラビング法、斜方蒸着法、磁場印加法、温度勾配法など
を用いることができる。高分子液晶組成物を用いる場合
には、重ね合わせを行なった基板を加熱し、等方相−液
晶相間の相転移点より低い温度で上下の基板にずり剪断
をかけて液晶材料を配向処理し、液晶分子を配向させる
方法（特開平２−１０３２２号公報記載）が好適であ
る。It is preferable that the liquid crystal material is subjected to alignment treatment when it is held between the substrates with electrodes or after that, and liquid crystal molecules of the liquid crystal composition are uniaxially horizontally aligned. The method of orientation treatment is not particularly limited and, for example, a well-known conventional rubbing method, oblique vapor deposition method, magnetic field application method, temperature gradient method, or the like can be used. When a polymer liquid crystal composition is used, the superposed substrates are heated, and the upper and lower substrates are shear-sheared at a temperature lower than the phase transition point between the isotropic phase and the liquid crystal phase to orient the liquid crystal material. A method of aligning liquid crystal molecules (described in JP-A No. 2-10322) is preferable.
【００２１】次いで、第一及び第二実施態様における強
誘電性液晶表示素子においては、表示側基板２を実施態
様に合わせて予め選択したものを用い、また表示側基板
２と裏側基板３の外側に、偏光板をクロスニコルになる
ように配設する（図示せず）。このとき、電界印加時の
コントラストが最大となるようにする。なお、強誘電性
液晶表示素子がゲストホスト型の場合には、表示側又は
裏側の基板２，３の外側に一枚の偏光板（図示せず）を
配設する。また、強誘電性液晶表示素子に防眩効果をも
たせるためには、予め表示側基板２の表面に防眩加工を
施しておく。このようにして第一及び第二実施態様にお
ける強誘電性液晶表示素子を得ることができ、さらに第
三及び第４実施態様等の強誘電性液晶表示素子を製造す
る場合には、表示側基板（偏光板）２の外側に透明性有
するゴムシート等からなる保護層４を形成したり、裏側
基板（偏光板）３の外側と支持部材６の間に弾性部材か
らなる衝撃吸収層５を形成する。Next, in the ferroelectric liquid crystal display element in the first and second embodiments, the display side substrate 2 which is preselected according to the embodiment is used, and the outside of the display side substrate 2 and the back side substrate 3 is used. Then, the polarizing plates are arranged so as to form a crossed Nicols (not shown). At this time, the contrast when the electric field is applied is maximized. When the ferroelectric liquid crystal display element is a guest-host type, one polarizing plate (not shown) is arranged outside the display-side or back-side substrates 2 and 3. Further, in order to provide the ferroelectric liquid crystal display element with an antiglare effect, the surface of the display side substrate 2 is previously subjected to an antiglare process. In this way, the ferroelectric liquid crystal display elements in the first and second embodiments can be obtained, and in the case of manufacturing the ferroelectric liquid crystal display elements in the third and fourth embodiments, the display side substrate A protective layer 4 made of a transparent rubber sheet or the like is formed on the outside of the (polarizing plate) 2, and a shock absorbing layer 5 made of an elastic member is formed between the outside of the back substrate (polarizing plate) 3 and the supporting member 6. To do.
【００２２】[0022]
実施例１ 表示側基板に厚さ１ｍｍの樹脂基板を用いた強誘電性液
晶表示素子に、重さ５．４ｇのパチンコ玉を１ｍの高さ
から表示側基板上に自然落下させた。そのときの配向状
態を表１に示す。 実施例２ 表示側基板に、厚み０．２ｍｍで曲げ強さ３５０Ｋｇｆ
／ｍｍ2 の樹脂基板を用いた強誘電性液晶表示素子に、
実施例１と同じ条件でパチンコ玉を落下させた。そのと
きの配向状態を表１に示す。 実施例３ 厚さ０．２ｍｍの表示側基板の表示面に、シリコンゲル
からなる厚さ５ｍｍの保護層を形成した強誘電性液晶表
示素子に、実施例１と同じ条件でパチンコ玉を落下させ
た。そのときの配向状態を表１に示す。 実施例４ 厚さ０．１ｍｍの裏側基板と液晶表示装置のケース（支
持部材）との間に発泡ウレタンからなる厚さ１０ｍｍの
衝撃吸収層を形成した強誘電性液晶表示素子に、重さ
５．４ｇのパチンコ玉を１ｍの高さからケースに自然落
下させた。そのときの配向状態を表１に示す。 比較例 厚さ０．１ｍｍからなる衝撃に対する処理を行なってい
ない二枚の基板で液晶材を挾持した強誘電性液晶表示素
子に、実施例１と同じ条件でパチンコ玉を落下させた。
このときの配向状態を表１に示す。 以下余白Example 1 On a ferroelectric liquid crystal display device using a resin substrate having a thickness of 1 mm as a display-side substrate, a pachinko ball weighing 5.4 g was naturally dropped onto the display-side substrate from a height of 1 m. Table 1 shows the orientation state at that time. Example 2 A display-side substrate having a thickness of 0.2 mm and a bending strength of 350 kgf
For a ferroelectric liquid crystal display device using a resin substrate of / mm 2
The pachinko balls were dropped under the same conditions as in Example 1. Table 1 shows the orientation state at that time. Example 3 A pachinko ball was dropped under the same conditions as in Example 1 onto a ferroelectric liquid crystal display element in which a protective layer made of silicon gel and having a thickness of 5 mm was formed on the display surface of a display-side substrate having a thickness of 0.2 mm. It was Table 1 shows the orientation state at that time. Example 4 A ferroelectric liquid crystal display element in which a shock absorbing layer having a thickness of 10 mm and made of urethane foam was formed between a back side substrate having a thickness of 0.1 mm and a case (supporting member) of a liquid crystal display device, and a weight of 5 was used. A pachinko ball (0.4 g) was naturally dropped into the case from a height of 1 m. Table 1 shows the orientation state at that time. Comparative Example A pachinko ball was dropped under the same conditions as in Example 1 onto a ferroelectric liquid crystal display element in which a liquid crystal material was sandwiched between two substrates having a thickness of 0.1 mm and which were not subjected to impact treatment.
Table 1 shows the alignment state at this time. Margin below
【００２３】[0023]
【表１】 パネル 配向変化部分割合（％） ───────────────────── 実施例１ ０ 〃 ２ ０ 〃 ３ ０ 〃 ４ ０ 比較例 ４０[Table 1] Panel orientation change portion ratio (%) ───────────────────── Example 1 0 〃 2 0 〃 3 0 〃 4 0 Comparative example 40
【００２４】この結果、各実施例の強誘電性液晶表示素
子には配向劣化が生ぜず、十分な耐衝撃性のあることが
判明した。As a result, it was found that the ferroelectric liquid crystal display elements of the respective examples did not cause alignment deterioration and had sufficient impact resistance.
【００２５】[0025]
【発明の効果】以上のように、本発明の強誘電性液晶表
示素子によれば、機械的衝撃等による液晶劣化を生せ
ず、優れた表示品質を得ることができ、しかも優れた表
示品質でありながら形態の自由性をも維持できる。As described above, according to the ferroelectric liquid crystal display device of the present invention, excellent display quality can be obtained without causing liquid crystal deterioration due to mechanical shock and the like, and excellent display quality is obtained. However, the freedom of form can be maintained.
【図１】本発明の第一実施態様における強誘電性液晶表
示素子の部分断面図を示す。FIG. 1 is a partial sectional view of a ferroelectric liquid crystal display device according to a first embodiment of the present invention.
【図２】本発明の第二実施態様における強誘電性液晶表
示素子の部分断面図を示す。FIG. 2 is a partial sectional view of a ferroelectric liquid crystal display element according to a second embodiment of the present invention.
【図３】本発明の第三実施態様における強誘電性液晶表
示素子の部分断面図を示す。FIG. 3 is a partial sectional view of a ferroelectric liquid crystal display element according to a third embodiment of the present invention.
【図４】本発明の第四実施態様における強誘電性液晶表
示素子の部分断面図を示す。FIG. 4 is a partial sectional view of a ferroelectric liquid crystal display device according to a fourth embodiment of the present invention.
１…強誘電性液晶材 ２…表示側基板 ３…裏側基板 ４…保護層 ５…衝撃吸収材 1 ... Ferroelectric liquid crystal material 2 ... Display side substrate 3 ... Back side substrate 4 ... Protective layer 5 ... Shock absorber
Claims (6)
の間に強誘電性液晶を挾持した液晶表示素子において、
上記二枚の透明樹脂基板のうち表示側基板を０．２〜５
ｍｍの厚さの板状基板とし、裏側基板を０．２ｍｍ以下
の可撓性フィルム状基板としたことを特徴とする強誘電
性液晶表示素子。1. A liquid crystal display device having a ferroelectric liquid crystal sandwiched between two transparent resin substrates having a transparent conductive film,
Of the above two transparent resin substrates, the display side substrate is 0.2 to 5
A ferroelectric liquid crystal display device comprising a plate-shaped substrate having a thickness of mm and a back side substrate being a flexible film-shaped substrate having a thickness of 0.2 mm or less.
の間に強誘電性液晶を挾持した液晶表示素子において、
強誘電性液晶表示素子表示側基板を０．２ｍｍ以下の曲
げ剛性率の高い部材で形成し、裏側基板を０．２ｍｍ以
下の強誘電性液晶表示素子。2. A liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film,
Ferroelectric liquid crystal display element A ferroelectric liquid crystal display element in which the display side substrate is formed of a member having a high bending rigidity of 0.2 mm or less and the back side substrate is 0.2 mm or less.
の間に強誘電性液晶を挾持した液晶表示素子において、
上記二枚の透明樹脂板を０．２ｍｍ以下の可撓性フィル
ム状基板とするとともに、表示側基板の表示側面に透明
性を有する弾性部材で保護層を形成した強誘電性液晶表
示素子。3. A liquid crystal display device having a ferroelectric liquid crystal sandwiched between two transparent resin substrates having a transparent conductive film,
A ferroelectric liquid crystal display device in which the two transparent resin plates are 0.2 mm or less flexible film substrates and a protective layer is formed on the display side surface of the display side substrate with an elastic member having transparency.
の間に強誘電性液晶を挾持した液晶表示素子において、
上記二枚の透明樹脂基板のうち裏側基板と支持部材との
間に衝撃吸収層を形成した強誘電性液晶表示素子。4. A liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between two transparent resin substrates having a transparent conductive film,
A ferroelectric liquid crystal display device having a shock absorbing layer formed between a back substrate and a supporting member of the two transparent resin substrates.
晶表示素子の支持部材との接合面側に、衝撃吸収層を形
成した強誘電性液晶表示素子。5. A ferroelectric liquid crystal display element having a shock absorbing layer formed on the surface of the ferroelectric liquid crystal display element according to claim 1, which is joined to a supporting member.
の間に強誘電性液晶を挾持した液晶表示素子において、
上記二枚の透明樹脂基板のうち表示側基板の表面に防眩
加工を施したことを特徴とする強誘電性液晶表示素子。6. A liquid crystal display device having a ferroelectric liquid crystal sandwiched between two transparent resin substrates having a transparent conductive film,
A ferroelectric liquid crystal display element characterized in that the surface of the display-side substrate of the two transparent resin substrates is antiglare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09336992A JP3219454B2 (en) | 1992-03-19 | 1992-03-19 | Ferroelectric liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09336992A JP3219454B2 (en) | 1992-03-19 | 1992-03-19 | Ferroelectric liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05264978A true JPH05264978A (en) | 1993-10-15 |
| JP3219454B2 JP3219454B2 (en) | 2001-10-15 |
Family
ID=14080387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09336992A Expired - Fee Related JP3219454B2 (en) | 1992-03-19 | 1992-03-19 | Ferroelectric liquid crystal display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0845695A3 (en) * | 1996-11-30 | 1998-12-23 | Lüder, Ernst, Prof. Dr.-Ing. habil. | Method of manufacturing of liquid crystal displays on plastic films using bistable liquid crystals |
| EP1241514A2 (en) | 2001-03-16 | 2002-09-18 | Nitto Denko Corporation | Liquid-crystal display apparatus |
| JP2002277858A (en) * | 2001-03-16 | 2002-09-25 | Nitto Denko Corp | Liquid crystal display |
| JP2002303866A (en) * | 2001-04-09 | 2002-10-18 | Nitto Denko Corp | Reflective liquid crystal display device |
| JP2012515361A (en) * | 2009-01-13 | 2012-07-05 | アンスティテュ・テレコム／テレコム・ブルターニュ | Optical shuttering device based on liquid crystal to attenuate switching noise of the liquid crystal, corresponding visual goggles and display device |
-
1992
- 1992-03-19 JP JP09336992A patent/JP3219454B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0845695A3 (en) * | 1996-11-30 | 1998-12-23 | Lüder, Ernst, Prof. Dr.-Ing. habil. | Method of manufacturing of liquid crystal displays on plastic films using bistable liquid crystals |
| EP1241514A2 (en) | 2001-03-16 | 2002-09-18 | Nitto Denko Corporation | Liquid-crystal display apparatus |
| JP2002277858A (en) * | 2001-03-16 | 2002-09-25 | Nitto Denko Corp | Liquid crystal display |
| EP1241514A3 (en) * | 2001-03-16 | 2003-09-10 | Nitto Denko Corporation | Liquid-crystal display apparatus |
| US6825895B2 (en) | 2001-03-16 | 2004-11-30 | Nitto Denko Corporation | Liquid-crystal display apparatus |
| KR100802761B1 (en) * | 2001-03-16 | 2008-02-12 | 닛토덴코 가부시키가이샤 | Liquid-crystal display apparatus |
| JP2002303866A (en) * | 2001-04-09 | 2002-10-18 | Nitto Denko Corp | Reflective liquid crystal display device |
| JP2012515361A (en) * | 2009-01-13 | 2012-07-05 | アンスティテュ・テレコム／テレコム・ブルターニュ | Optical shuttering device based on liquid crystal to attenuate switching noise of the liquid crystal, corresponding visual goggles and display device |
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| Publication number | Publication date |
|---|---|
| JP3219454B2 (en) | 2001-10-15 |
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