JP2764275B2 - Display element - Google Patents
Display elementInfo
- Publication number
- JP2764275B2 JP2764275B2 JP63192617A JP19261788A JP2764275B2 JP 2764275 B2 JP2764275 B2 JP 2764275B2 JP 63192617 A JP63192617 A JP 63192617A JP 19261788 A JP19261788 A JP 19261788A JP 2764275 B2 JP2764275 B2 JP 2764275B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display element
- recording layer
- polymer liquid
- information
- 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
Links
- 239000005264 High molar mass liquid crystal Substances 0.000 claims description 26
- 229920006037 cross link polymer Polymers 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 14
- 239000010408 film Substances 0.000 description 22
- 239000010410 layer Substances 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 10
- 238000004132 cross linking Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000003431 cross linking reagent Substances 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 229920002319 Poly(methyl acrylate) Polymers 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000005267 main chain polymer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002432 poly(vinyl methyl ether) polymer Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000131 polyvinylidene Polymers 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000005266 side chain polymer Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920006352 transparent thermoplastic Polymers 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Substances (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、熱的に情報の書込みもしくは消去が可能な
表示素子に関し、特に記録層の熱による劣化を防止した
表示素子に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display element capable of thermally writing or erasing information, and more particularly to a display element in which a recording layer is prevented from being deteriorated by heat.
［従来の技術］ 従来、熱的に情報の書込みもしくは消去（以下、書込
み・消去と記す）が可能な記録層上に、サーマルヘッド
等を用いて熱的に情報の書込み・消去を行なう場合、記
録層に直接情報の書込み・消去を行なう方法、および記
録層の表面にポリエチレンテレフタレート等の透明な熱
可塑性樹脂フィルム等の保護層を設け、該保護層を介し
て記録層に間接的に書込み・消去を行なう方法とがあ
る。[Prior Art] Conventionally, when information is written or erased thermally using a thermal head or the like on a recording layer on which information can be written or erased thermally (hereinafter referred to as write / erase), A method for directly writing / erasing information on the recording layer, and providing a protective layer such as a transparent thermoplastic resin film such as polyethylene terephthalate on the surface of the recording layer, and indirectly writing / writing on the recording layer via the protective layer. There is a method of erasing.
［発明が解決しようとする課題］ しかしながら、サーマルヘッド等を用いて記録層に直
接熱的に情報の書込み・消去を行なう方法では加熱時に
加圧するために記録層が熱変形して元の形状に戻らなか
ったり、また記録層の一部がサーマルヘッド側へ移行す
る等の問題があった。[Problems to be Solved by the Invention] However, in a method of directly writing and erasing information on a recording layer by using a thermal head or the like, the recording layer is thermally deformed due to pressurization at the time of heating and returns to its original shape. There were problems such as not returning, and a part of the recording layer shifting to the thermal head side.
また、加熱時に加圧しない場合でも、加熱時の記録層
を形成する材料の粘度が低い場合には、加熱時に記録層
の熱変形が生じ、元の形状に戻らない等の問題があっ
た。Even when pressure is not applied at the time of heating, if the viscosity of the material forming the recording layer at the time of heating is low, there is a problem that the recording layer is thermally deformed at the time of heating and does not return to the original shape.
一方、上記の問題を改善するために、表示素子表面の
保護膜として透明な樹脂フィルムを設ける方法がある
が、樹脂フィルムの熱伝導率が低い等のため、熱を記録
層に有効に伝えるためには、樹脂フィルムの厚さを薄く
しなければならないが、薄くするとフィルムの機械的強
度が低下する。また、フィルムとして熱可塑性樹脂フィ
ルムを用いると、熱的書込み・消去を長時間繰り返して
いるうちにフィルムが変形し表面形状が平滑でなくなっ
てくる等の問題が生じる。On the other hand, in order to improve the above-mentioned problem, there is a method of providing a transparent resin film as a protective film on the surface of the display element. However, since the heat conductivity of the resin film is low, heat is effectively transmitted to the recording layer. In this case, the thickness of the resin film must be reduced, but when the thickness is reduced, the mechanical strength of the film decreases. In addition, when a thermoplastic resin film is used as a film, there arises a problem that the film is deformed and the surface shape becomes not smooth while thermal writing / erasing is repeated for a long time.
本発明は、上記の様な従来技術の状況を鑑みてなされ
たものであり、サーマルヘッド等を用いて熱的に情報の
書込み・消去を行なう場合、記録層として架橋した高分
子液晶又は架橋した相分離型高分子を用いることによ
り、加熱時に熱変形することがなく、また加熱時に加圧
して変形させても加圧の解除後には容易に元の形状に戻
ることのできる表示素子を提供することを目的とするも
のである。The present invention has been made in view of the state of the prior art as described above, and when thermally writing / erasing information using a thermal head or the like, a polymer liquid crystal or a crosslinked polymer having a crosslinked structure as a recording layer. By using a phase-separated polymer, there is provided a display element which does not thermally deform during heating and can easily return to its original shape after release of pressurization even when deformed by pressurizing during heating. The purpose is to do so.
［課題を解決するための手段］ 即ち、本発明は、情報の書込み・消去を行なう温度に
於いて弾性を有する架橋した高分子液晶又は架橋した相
分離型高分子からなる記録層を有することを特徴とする
表示素子である。[Means for Solving the Problems] That is, the present invention provides a recording layer comprising a crosslinked polymer liquid crystal or a crosslinked phase-separated polymer having elasticity at a temperature at which information is written / erased. This is a characteristic display element.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の表示素子は、基質フィルム上に記録層を有
し、該記録層として情報の書込み・消去を行なう温度に
於いて弾性を有する架橋した高分子液晶又は架橋した相
分離型高分子を使用することにより、熱的に情報の書込
み・消去を行なう際に記録層が熱変形することがなく、
また加熱時に加圧して変形させても加圧の解除後には容
易に元の形状に戻ることができるものである。The display element of the present invention has a recording layer on a substrate film, and uses a cross-linked polymer liquid crystal or a cross-linked phase-separated polymer having elasticity at a temperature at which information is written / erased as the recording layer. By doing so, the recording layer is not thermally deformed when writing / erasing information thermally,
Further, even if the shape is deformed by pressing during heating, the shape can be easily returned to the original shape after the release of the pressing.
本発明における記録層を形成する架橋した高分子液晶
としては、公知のコレステリック高分子液晶、ネマチッ
ク高分子液晶、スメクチック高分子液晶等をそれぞれ架
橋した高分子液晶があげられる。高分子液晶は液晶形成
能を有するイソーゲン基を主鎖に有する主鎖型高分子液
晶またはメソーゲン基を側鎖に有する側鎖型高分子液
晶、又は主鎖，側鎖両方に有するもののいずれをも用い
ることも可能である。As the crosslinked polymer liquid crystal forming the recording layer in the present invention, a known cholesteric polymer liquid crystal, a nematic polymer liquid crystal, a smectic polymer liquid crystal, or the like can be used. The polymer liquid crystal is either a main chain type polymer liquid crystal having an isogen group having a liquid crystal forming ability in a main chain, a side chain type polymer liquid crystal having a mesogen group in a side chain, or a liquid crystal having both main chains and side chains. It is also possible to use.
架橋した主鎖型高分子液晶の例としては、「マクロモ
レキュラー ケミストリー・マクロモレキュラー シン
ポジア（Makromolecular Chemistry,Macromolecular Sy
mposia）」４,91〜101頁（1987年）に記載されている主
鎖型高分子液晶 とを反応して得られるものがあげられる。その他の主鎖
型高分子液晶としては、芳香族ポリエステル，ポリペプ
チド，ヒドロキシプロピルセルロースなどを主鎖として
有するものを使用することができる。Examples of cross-linked main-chain polymer liquid crystals include “Makromolecular Chemistry, Macromolecular Sy
mposia) ", 4 , 91-101 (1987). And those obtained by reacting As the other main chain type polymer liquid crystal, those having an aromatic polyester, polypeptide, hydroxypropyl cellulose or the like as a main chain can be used.
また，架橋した側鎖型高分子液晶の例としては、「マ
クロモレキュラー ケミストリー（Makromolecular Che
mistry）」188巻,667頁（1987年）に記載されている側
鎖型高分子液晶 と架橋剤OCN−（CH2）６−NCO,もしくは架橋剤 とを反応して得られるもの、及び「マクロモレキュラー
ケミストリー（Makromolecular Chemistry）」188巻,
1490頁（1987年）に記載されている と、メソーゲン基を有する とを反応して得られる 等があげられる。Examples of cross-linked side-chain polymer liquid crystals include “Makromolecular Chemistry”.
mistry) ", vol. 188, p. 667 (1987). And crosslinking agent OCN- (CH 2 ) 6 -NCO or crosslinking agent And “Macromolecular Chemistry”, vol. 188,
It is described on page 1490 (1987) And having a mesogen group Obtained by reacting And the like.
その他の例としては、「マクロモレキュラー ケミス
トリー・マクロモレキュラー シンポジア」４巻,98頁
（1986年）に記載されている主鎖と側鎖の両方にメソー
ゲン基 を有する とを反応して得られるもの等があげられる。As another example, a mesogen group can be added to both the main chain and the side chain described in “Macromolecular Chemistry / Macromolecular Symposia”, vol. 4, p. 98 (1986). Having And those obtained by reacting
また、低分子液晶と架橋した液晶性を示さない高分子
とのブレンド物について、熱的に情報の書込み・消去が
可能な場合には、上記の架橋した高分子液晶と同様に表
示媒体として使用することができる。If a blend of a low-molecular liquid crystal and a cross-linked polymer that does not exhibit liquid crystallinity can be used to thermally write and erase information, it can be used as a display medium in the same manner as the cross-linked polymer liquid crystal described above. can do.
次に、架橋した相分離型高分子としては、ポリフッ化
ビニリデン−ポリアクリル酸メチルブレンド物、ポリス
チレン−ポリイソプレンブレンド物、ポリスチレン−ポ
リイソブテンブレンド物、ポリスチレン−ポリビニルメ
チルエーテルブレンド物、ポリアクリル酸メチル−ポリ
スチレン／アクリロニトリル共重合体ブレンド物、塩素
化ポリイソプレン−エチレン／酢酸ビニル共重合体ブレ
ンド物等のブレンド物に於いて、ブレンド物の一方もし
くは両者を架橋した相分離型高分子ブレンド物があげら
れる。Next, as the crosslinked phase-separated polymer, polyvinylidene fluoride-polymethyl acrylate blend, polystyrene-polyisoprene blend, polystyrene-polyisobutene blend, polystyrene-polyvinyl methyl ether blend, polymethyl acrylate- In a blend such as a polystyrene / acrylonitrile copolymer blend or a chlorinated polyisoprene-ethylene / vinyl acetate copolymer blend, a phase-separated polymer blend obtained by crosslinking one or both of the blends is exemplified. .
架橋した高分子液晶又は架橋した相分離型高分子の薄
膜を形成する方法としては、反応性化合物をスピンコー
ト法、キャスト法、ディッピング法等により薄膜状にし
て架橋反応を行なうことにより形成することができる。
架橋反応に溶媒が必要な場合には、架橋反応後に使用し
た溶媒を蒸発して除去する。As a method of forming a crosslinked polymer liquid crystal or a crosslinked phase-separated polymer thin film, a reactive compound is formed into a thin film by a spin coating method, a casting method, a dipping method or the like, and a crosslinking reaction is performed. Can be.
When a solvent is required for the crosslinking reaction, the solvent used after the crosslinking reaction is removed by evaporation.
また、架橋反応は一分子中に２個以上の官能基を有す
る化合物を架橋剤として用いて、付加反応、縮合反応等
により行うことができる。The cross-linking reaction can be carried out by an addition reaction, a condensation reaction or the like using a compound having two or more functional groups in one molecule as a cross-linking agent.
架橋した高分子液晶又は架橋した相分離型高分子は、
そのガラス転移温度以上もしくは結晶の融解温度以上に
於いて弾性を有し、ゴム状の弾性体となる。前記温度に
おいて、表示素子に熱的に情報の書込み・消去が行なわ
れる。また、その剛性率は、原材料の化学組成、架橋剤
の種類及び濃度、架橋点間の分子量等によって異るが、
情報の書込み・消去を行なう温度、具体的には50〜250
℃に於いて、測定周波数1rad/secにて通常１×102dyn c
m-2以上、好ましくは１×102〜１×107dyn cm-2、さら
に好ましくは１×104〜１×107dyn cm-2の範囲が望まし
い。剛性率が１×102dyn cm-2未満では塑性変形するた
めに情報の書込み・消去の加熱時に加圧すると熱変形し
元の形状に戻り難くなるので好ましくない。なお、本発
明における剛性率とは、レオメトリクス社製、レオメー
タRMS 800のような平行・円板型レオメータを用いて、
表示素子として使用される温度で測定して得られる値を
示す。Crosslinked polymer liquid crystal or crosslinked phase-separated polymer is
It has elasticity above its glass transition temperature or above the melting temperature of crystals, and becomes a rubber-like elastic body. At the above-described temperature, information is written and erased in the display element thermally. The rigidity varies depending on the chemical composition of the raw materials, the type and concentration of the crosslinking agent, the molecular weight between crosslinking points, and the like.
Temperature at which information is written / erased, specifically 50 to 250
℃ In generally 1 × 10 2 dyn c at a measurement frequency 1 rad / sec
m −2 or more, preferably 1 × 10 2 to 1 × 10 7 dyn cm −2 , more preferably 1 × 10 4 to 1 × 10 7 dyn cm −2 . If the rigidity is less than 1 × 10 2 dyn cm −2, it is not preferable because it is plastically deformed and pressurized at the time of heating for writing and erasing information. Incidentally, the rigidity in the present invention, manufactured by Rheometrics, using a parallel and disk type rheometer such as RMS800 Rheometer,
The value obtained by measuring at the temperature used as a display element is shown.
以上述べたように、本発明の架橋した高分子液晶又は
架橋した相分離型高分子を熱的に情報の書込み・消去を
行なう記録層として用いることにより、加熱時に熱変形
しない、又は加熱時に加圧し変形させても、加圧の解除
後は容易に元の形状に戻ることのできる表示素子を得る
ことができる。As described above, by using the cross-linked polymer liquid crystal or the cross-linked phase-separated polymer of the present invention as a recording layer for thermally writing / erasing information, it does not thermally deform when heated or is heated during heating. A display element that can easily return to the original shape after the release of pressure can be obtained even when the element is deformed by pressing.
［作用］ 本発明の表示素子は、情報の書込みもしくは消去を行
なう温度に於いて弾性を有する架橋した高分子液晶又は
架橋した相分離型高分子からなる記録層を有するが、前
記架橋した高分子液晶又は架橋した相分離型高分子は３
次元的な網目構造を有し、ガラス転移温度以上もしくは
結晶の融解温度以上において、外部応力により変形を受
けても応力の解除後は元の寸法に戻る弾性を有するゴム
状弾性体となる。[Operation] The display element of the present invention has a recording layer made of a crosslinked polymer liquid crystal or a crosslinked phase-separated polymer having elasticity at a temperature at which information is written or erased. Liquid crystal or crosslinked phase-separated polymer is 3
A rubber-like elastic body having a dimensional network structure and having an elasticity that returns to its original size after the stress is released even if it is deformed by external stress at a temperature equal to or higher than the glass transition temperature or the melting temperature of the crystal.
従って、これらの高分子を熱的に情報の書込み消去を
行なう記録媒体として用いる場合、ガラス転移温度以上
もしくは結晶の融解温度以上の温度で情報の書込み消去
を行なっても、加熱時に熱変形することがなく、また加
熱時の加圧等により変形を受けても、ゴム弾性を有して
いるため加圧の解除後はすみやかに元の形状に戻ること
が可能である。Therefore, when these polymers are used as a recording medium for thermally writing and erasing information, even if information is written or erased at a temperature equal to or higher than the glass transition temperature or the melting temperature of a crystal, the polymer is thermally deformed during heating. Even if it is deformed by pressure or the like during heating, it has rubber elasticity, so that it can quickly return to its original shape after the release of pressure.
［実施例］ 以下、実施例を示し本発明をさらに具体的に説明す
る。[Example] Hereinafter, the present invention will be described more specifically with reference to examples.
実施例１ 下記の構造式（Ｉ）で示される高分子液晶100重量部
と下記の構造式（II）で示される架橋剤２重量部と白金
触媒0.5重量部を溶解した濃度10wt％トルエン溶液をテ
フロンシート上にキャストし、温度を60℃にあげて架橋
反応を48時間行った。Example 1 A 10 wt% toluene solution in which 100 parts by weight of a polymer liquid crystal represented by the following structural formula (I), 2 parts by weight of a crosslinking agent represented by the following structural formula (II), and 0.5 part by weight of a platinum catalyst were dissolved was prepared. It was cast on a Teflon sheet, the temperature was raised to 60 ° C., and a crosslinking reaction was performed for 48 hours.
反応終了後、生成した架橋した高分子液晶フィルムを
ヘキサンで洗浄した後、真空下で乾燥した。この厚み10
μｍの架橋した高分子液晶フィルムを厚み50μｍのポリ
エチレンテレフタレートフィルム上に置き、温度を150
℃に上げ、架橋した高分子液晶フィルムをポリエチレン
テレフタレートフィルム上に固定して表示素子を作成し
た。第１図は作成した表示素子の模式的断面図であり、
１は架橋した高分子液晶フィルム、２は基質フィルムを
示す。 After the completion of the reaction, the formed crosslinked polymer liquid crystal film was washed with hexane and dried under vacuum. This thickness 10
a cross-linked polymer liquid crystal film having a thickness of 50 μm on a polyethylene terephthalate film having a thickness of 50 μm,
C., and the crosslinked polymer liquid crystal film was fixed on a polyethylene terephthalate film to prepare a display element. FIG. 1 is a schematic cross-sectional view of the prepared display element.
1 is a crosslinked polymer liquid crystal film, and 2 is a substrate film.
このようにして作成した架橋した高分子液晶フィルム
を記録層として有する表示素子を、第２図に示す表示装
置に、エンドレスのフィルム状で組込んで、サーマルヘ
ッドにより情報の書込み・消去を行なった。The display element having a crosslinked polymer liquid crystal film as a recording layer formed as described above was incorporated into the display device shown in FIG. 2 in the form of an endless film, and information was written / erased using a thermal head. .
消去は130℃にフィルムを加熱し徐冷することによ
り、書込みは200℃に加熱し急冷することにより行っ
た。書込まれた領域は透明で、背景は白く散乱した画像
が得られ、この画像は１ヶ月以上保持された。また、書
込み・消去の繰り返し試験を10,000回行ったところ、表
示素子の表面形状は初期の状態を保っていた。Erasing was performed by heating the film to 130 ° C. and gradually cooling, and writing was performed by heating to 200 ° C. and rapidly cooling. The written area was transparent and the background was a white scattered image which was retained for more than a month. Further, when the repeated writing / erasing test was performed 10,000 times, the surface shape of the display element was kept in the initial state.
［発明の効果］ 以上の説明から明らかなように、本発明によれば、熱
的に情報の書込み・消去を行う表示素子の記録層とし
て、情報の書込みもしくは消去を行なう温度に於いて弾
性を有する架橋した高分子液晶又は架橋した相分離型高
分子を用いることにより、加熱時に熱変形することがな
く、また加熱時に加圧して変形させても加圧の解除後に
は容易に元の形状に戻ることのできる表示素子を得るこ
とができる。[Effects of the Invention] As is clear from the above description, according to the present invention, the recording layer of a display element for thermally writing / erasing information has elasticity at a temperature at which information is written or erased. By using a cross-linked polymer liquid crystal or a cross-linked phase-separated polymer, it does not thermally deform during heating, and even when pressed and deformed during heating, easily returns to its original shape after the pressure is released. A display element which can return can be obtained.
第１図は本発明の表示素子の一実施例の構造を示す模式
的断面図および第２図は表示素子の表示に使用する表示
装置を示す説明図である。 １……架橋した高分子液晶フィルム ２……基質フィルム、３……表示素子 ４……ローラー、５……ハロゲンランプ ６……面ヒータ、７……温度センサー ８……像担持体ベルト、９……バックグラウンド 10……駆動ローラ、11……サーマルヘッド 12……ハロゲンローラー、13……表示部FIG. 1 is a schematic sectional view showing the structure of an embodiment of the display element of the present invention, and FIG. 2 is an explanatory view showing a display device used for displaying the display element. DESCRIPTION OF SYMBOLS 1 ... Crosslinked polymer liquid crystal film 2 ... Substrate film 3 ... Display element 4 ... Roller 5 ... Halogen lamp 6 ... Surface heater 7 ... Temperature sensor 8 ... Image carrier belt 9 …… Background 10 …… Drive roller, 11… Thermal head 12… Halogen roller, 13 …… Display unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 土志田 嘉 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (56)参考文献 特開 昭59−10930（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G02F 1/13 G02F 1/1333────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikado Toshida 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-59-10930 (JP, A) (58) Survey Field (Int.Cl. 6 , DB name) G02F 1/13 G02F 1/1333
Claims (3)
於いて弾性を有する架橋した高分子液晶又は架橋した相
分離型高分子からなる記録層を有することを特徴とする
表示素子。1. A display element comprising a recording layer made of a crosslinked polymer liquid crystal or a crosslinked phase-separated polymer having elasticity at a temperature at which information is written or erased.
消去が可能である請求項１記載の表示素子。2. The display element according to claim 1, wherein said recording layer is capable of thermally writing or erasing information.
離型高分子の剛性率が、情報の書込みもしくは消去を行
なう温度に於いて１×102dyn cm-2以上である請求項１
記載の表示素子。3. The crosslinked polymer liquid crystal or the crosslinked phase-separated polymer has a rigidity of 1 × 10 2 dyn cm −2 or more at a temperature at which information is written or erased.
The display element as described in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192617A JP2764275B2 (en) | 1988-08-03 | 1988-08-03 | Display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192617A JP2764275B2 (en) | 1988-08-03 | 1988-08-03 | Display element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0242415A JPH0242415A (en) | 1990-02-13 |
| JP2764275B2 true JP2764275B2 (en) | 1998-06-11 |
Family
ID=16294239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63192617A Expired - Fee Related JP2764275B2 (en) | 1988-08-03 | 1988-08-03 | Display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2764275B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354498A (en) * | 1990-03-16 | 1994-10-11 | Fuji Xerox Co., Ltd. | Phase separation liquid crystal polymer |
| US5620781A (en) * | 1991-10-23 | 1997-04-15 | Fuji Xerox Co., Ltd. | Erasable display medium |
| US5589237A (en) * | 1993-06-25 | 1996-12-31 | Fuji Xerox Co., Ltd. | Reversible display medium |
| US5670083A (en) * | 1994-02-23 | 1997-09-23 | Fuji Xerox Co., Ltd. | Optical element and process for producing the same |
| US5707543A (en) * | 1994-05-11 | 1998-01-13 | Fuji Xerox Co., Ltd. | Reversible display medium |
| US5691092A (en) * | 1994-12-02 | 1997-11-25 | Fuji Xerox Co., Ltd. | Method for producing optical element |
| JP2004514934A (en) * | 2000-12-14 | 2004-05-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Liquid crystal display laminate and method of manufacturing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910930A (en) * | 1982-07-10 | 1984-01-20 | Konishiroku Photo Ind Co Ltd | Information recording medium |
-
1988
- 1988-08-03 JP JP63192617A patent/JP2764275B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0242415A (en) | 1990-02-13 |
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