JPS6318327A - Plastic liquid crystal display element - Google Patents
Plastic liquid crystal display elementInfo
- Publication number
- JPS6318327A JPS6318327A JP16332586A JP16332586A JPS6318327A JP S6318327 A JPS6318327 A JP S6318327A JP 16332586 A JP16332586 A JP 16332586A JP 16332586 A JP16332586 A JP 16332586A JP S6318327 A JPS6318327 A JP S6318327A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- film
- display element
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 25
- 239000004033 plastic Substances 0.000 title claims description 12
- 229920003023 plastic Polymers 0.000 title claims description 12
- 239000002985 plastic film Substances 0.000 claims abstract description 12
- 229920006255 plastic film Polymers 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 claims description 25
- 239000010409 thin film Substances 0.000 claims description 10
- -1 polyethylene terephthalate Polymers 0.000 claims description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 229910003437 indium oxide Inorganic materials 0.000 claims description 3
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001887 tin oxide Inorganic materials 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 239000000758 substrate Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 229920006267 polyester film Polymers 0.000 description 8
- 239000004695 Polyether sulfone Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920002492 poly(sulfone) Polymers 0.000 description 3
- 229920006393 polyether sulfone Polymers 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- AZWHFTKIBIQKCA-UHFFFAOYSA-N [Sn+2]=O.[O-2].[In+3] Chemical compound [Sn+2]=O.[O-2].[In+3] AZWHFTKIBIQKCA-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は表面に透明導電性薄膜を設けてなる透明導電性
プラスチックスフィルムの一対の間に液晶物質を挾持す
る電圧印加型液晶表示素子の改良に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a voltage application type liquid crystal display device in which a liquid crystal substance is sandwiched between a pair of transparent conductive plastic films each having a transparent conductive thin film on the surface thereof. It is about improvement.
（従来技術および問題点）
従来より液晶表示素子電極板には、ガラス基板の表面に
透明導電層を設けたものが用いられている。しかるに液
晶表示素子は、益々軽量、薄型化される方向におり、ガ
ラス基板をプラスチックス基板特にフィルム基板に置き
かえる試みがなされている。置きかえるについての重要
な問題はプラスチックスの複屈折であって、その為例え
ば、二軸延伸ポリエステルフィルムでは消光角の差異が
５°以内の部分を用いそのまま、また−軸延伸ポリエス
テルフィルムを用いるものおよび無配向のポリサルホン
、ポリエーテルサルホンフィルム等を用いるものがある
。(Prior Art and Problems) Conventionally, a liquid crystal display element electrode plate having a transparent conductive layer provided on the surface of a glass substrate has been used. However, liquid crystal display elements are becoming increasingly lighter and thinner, and attempts are being made to replace glass substrates with plastic substrates, particularly film substrates. An important issue for replacement is the birefringence of plastics, so for example, for biaxially oriented polyester films, parts with extinction angle differences within 5 degrees are used as is, and for axially oriented polyester films, and Some use non-oriented polysulfone, polyethersulfone films, etc.
しかしこれらはそれぞれ欠点を有し無配向のポリサルホ
ン、ポリエーテルサルホンフィルムは現在の所厚み均一
なフィルムを得ることが難しくまた着色しているし、致
命的な事は耐薬品性、耐液晶性がそれほど良くなく、限
られた溶剤、液晶のみが使用されるために、その使用条
件が限られており、二軸延伸ポリエステルフィルムは現
在大量に製造されており入手容易であるが基板の切りだ
しの位置決めが難しく、さもないとできあがった液晶表
示素子の表示の均一性が悪く、−軸延伸ポリエステルフ
ィルムでも二軸延伸ポリエステルフィルム程ではないに
しても同様の欠点を有する。However, each of these has drawbacks, and it is currently difficult to obtain films with uniform thickness for unoriented polysulfone and polyethersulfone films, and they are colored, and the fatal problem is chemical resistance and liquid crystal resistance. However, since biaxially oriented polyester film is currently manufactured in large quantities and is easily available, it is difficult to cut out the substrate. It is difficult to position the film, otherwise the display uniformity of the resulting liquid crystal display device will be poor, and -axially oriented polyester films have the same drawbacks as biaxially oriented polyester films, although not as much.
その為これらに代るフィルムの開発が望まれていた。Therefore, it has been desired to develop a film to replace these.
（問題点を解決するための手段）
本発明はかかる欠点をもたないプラスチックスフィルム
の開発を検討の結果、縦横の延伸倍率比略々１で同時二
軸延伸して製造したフィルムがかかる欠点をもたない事
を見出した。(Means for Solving the Problems) As a result of studying the development of a plastic film that does not have these drawbacks, the present invention found that a film produced by simultaneous biaxial stretching at a stretching ratio of approximately 1 in the longitudinal and lateral directions has such drawbacks. I found out that it does not have .
即ち本発明は表面に透明導電性薄膜を設けてなる透明導
電性プラスチックスフィルムの一対の間に液晶物質を挾
持する電圧印加型液晶表示素子に於て該プラスチックス
フィルムが縦横の延伸倍率比略々１で同時二軸延伸して
製造した物であることを特徴とするプラスチックス液晶
表示素子で必る。That is, the present invention provides a voltage application type liquid crystal display element in which a liquid crystal material is sandwiched between a pair of transparent conductive plastic films each having a transparent conductive thin film on the surface thereof, and in which the plastic film has a vertical and horizontal stretching ratio. This is necessary for a plastic liquid crystal display element characterized in that it is manufactured by simultaneous biaxial stretching in both steps 1 and 1.
プラスチックスとしてはポリエチレンテレフタレートが
最も適した材料である。ポリエチレンテレフタレートは
現在大量に作られ品質も安定しており、この様な光学素
子にとって重要な厚みの均一なものが得やすく、最低限
必要な厚みのバラツキ５％以内のポリエチレンテレフタ
レートフィルムも容易に得ることができる利点がおる。Polyethylene terephthalate is the most suitable plastic material. Polyethylene terephthalate is currently produced in large quantities and its quality is stable, making it easy to obtain polyethylene terephthalate films with uniform thickness, which is important for such optical elements, and it is also easy to obtain polyethylene terephthalate films with a minimum required thickness variation of less than 5%. There is an advantage in being able to do so.
本来複屈折率がＯでおることが望ましいが一般的には望
むべくもなく、従来の無配向のポリエーテルサルホン、
ポリサルホンフィルムでも複屈折率Δμが５×１０→以
下の有限値を有する。配向性でありながらこのよう光学
的にすぐれているポリエステルフィルムを得るためには
従来の遂次二軸延伸法ではなく、同時二軸延伸法を行な
い、しかも縦延伸倍率と横延伸倍率との比を１．０にす
る。このような方法で製膜したフィルムは幅方向に対す
る複屈折率を測定すると図１のａのようになり、通常の
遂次２軸延伸法で製膜したフィルムの場合のｂより幅広
く複屈折率が５Ｘ１０″４以下の部分を採取することが
できる。したがって、複屈折率が５×１０４以下の部分
をロールフィルムの長手方向（Ｍ Ｄ方向）に対して採
取し、その部分で液晶表示素子を製作すると、光学的に
すぐれたものができあがる。Although it is originally desirable that the birefringence be O, this is generally undesirable, and conventional non-oriented polyether sulfone,
Even a polysulfone film has a finite value of birefringence Δμ of 5×10→ or less. In order to obtain such an optically excellent polyester film despite its orientation, simultaneous biaxial stretching was carried out instead of the conventional sequential biaxial stretching method, and the ratio of the longitudinal stretch ratio to the transverse stretch ratio was changed. Set to 1.0. When the birefringence of the film produced by this method is measured in the width direction, it is as shown in a in Figure 1, and the birefringence is wider than b of the film produced by the normal sequential biaxial stretching method. It is possible to sample a portion with a birefringence of 5×10″4 or less. Therefore, a portion with a birefringence of 5×104 or less can be sampled in the longitudinal direction (MD direction) of the roll film, and a liquid crystal display element can be formed in that portion. When manufactured, the result is something optically excellent.
フィルムの厚みとしては、５０〜５００μ瓦の範囲が好
ましい。特に、電極間隔を一定に保ち、しかも薄型化可
能で且つ透明導電性フィルムの製造上の見地から７５〜
２００μｍの範囲が好ましい。The thickness of the film is preferably in the range of 50 to 500 μm. In particular, 75~
A range of 200 μm is preferred.
又、本発明で使用するフィルムは厚みのバラツキが５％
以内であることも好ましい条件である。厚みのバラツキ
は３０ｍ間隔でり略々１ＴｒＬ四方の試料をとりその周
辺の中央部を結ぶ十字の部分について２．５ｃｍ置きに
厚みを測定した時に、それらの数値のバラツキが５％以
内に入ることを意味する。本発明で使用するフィルムの
材質は特に限定はされないが、ポリエチレンテレフタレ
ートが現状では良い。In addition, the film used in the present invention has a thickness variation of 5%.
It is also a preferable condition that it is within the range. The variation in thickness is at 30m intervals, and when a sample of approximately 1 TrL square is taken and the thickness is measured every 2.5cm of the cross connecting the center of the sample, the variation in the values must be within 5%. means. The material of the film used in the present invention is not particularly limited, but polyethylene terephthalate is currently preferred.
該基板上に設ける透明電極は、酸化スズを少量ドープし
た酸化インジウム薄膜、金薄膜が好適でおり、特に酸化
スズを少量ドープした酸化インジウム薄膜が透明性の点
で好ましい。基板上にこれら導電性薄膜を設ける方法と
しては、真空蒸着法、スパッタリング法、イオンブレー
ティング法等があげられる。The transparent electrode provided on the substrate is preferably an indium oxide thin film doped with a small amount of tin oxide or a gold thin film, and an indium oxide thin film doped with a small amount of tin oxide is particularly preferable from the viewpoint of transparency. Examples of methods for providing these conductive thin films on a substrate include a vacuum evaporation method, a sputtering method, and an ion blasting method.
本発明にあける透明導電性薄膜は、通常可視光（５５０
μｍ）の透過率が少くとも７５％以上ありかつ表面抵抗
が１６に０７口以下のものである。The transparent conductive thin film provided in the present invention is usually visible light (550
The transmittance (μm) is at least 75% or more, and the surface resistance is 16 to 07 or less.
好ましくは該透過率が８０％以上あり、表面抵抗が１０
０〜２００Ω／口のものでおる。Preferably, the transmittance is 80% or more and the surface resistance is 10.
0 to 200Ω/mouth.
（発明の効果）
同倍率同時二軸延伸フィルムはその中央部で複屈折率５
Ｘ１０″′４以下の部分が巾広くあるため、（６真６行
〜８行）従来の遂次二軸延伸法では消光色の差異が５°
以内の部分を用いるとしても小さな部分しか得られない
ので大型の基板が得られないばかりか、小さな基板でも
中央部と端部とで明るさに差のある表示素子しか出来な
い場合があり、製品の小止りが悪いのに対して、本発明
では無歪の相当大きな素子が製造出来る。(Effect of the invention) The biaxially stretched film with the same magnification has a birefringence of 5 at its center.
Since the area below X10'''4 is wide, the difference in extinction color is 5° in the conventional sequential biaxial stretching method (6 lines 6 to 8 lines).
Even if a part within the range is used, only a small part will be obtained, and a large board will not be obtained.Even if the board is small, only a display element with a difference in brightness between the center and the edges may be produced. On the other hand, the present invention can produce a considerably large element without distortion.
（実施例１）
複屈折率を５Ｘ１０−５以下を有するポリエステルフィ
ルムに透明導電膜（酸化インジウム−酸化スズ合金）を
施したのち、８の字形状の電極パターンを形成した。こ
の電極パターンにポリアミド系の配向処理膜を施し、ラ
ビングすることにより配向処理した。この２枚のフィル
ムをエポキシ樹脂で張り合わせることにより表示素子を
形成した。(Example 1) A transparent conductive film (indium oxide-tin oxide alloy) was applied to a polyester film having a birefringence of 5×10 −5 or less, and then a figure-8 electrode pattern was formed. A polyamide-based alignment treatment film was applied to this electrode pattern, and alignment treatment was performed by rubbing. A display element was formed by laminating these two films together with an epoxy resin.
この液晶表示素子の表示能力を観察したところ、５００
時間経過後であっても充分な能力があることが判明した
。When the display capacity of this liquid crystal display element was observed, it was found that 500
It turned out that it had sufficient ability even after the lapse of time.
しかも、通常の遂次延伸法での二軸延伸ポリエステルフ
ィルムの場合と比べて、１０〜２０倍（５０ｃｍ）広い
幅で採取することが可能となった。In addition, it became possible to sample a width 10 to 20 times (50 cm) wider than that of a biaxially stretched polyester film produced by the usual sequential stretching method.
さらに、複屈折率５Ｘ１０−４以下を有するので、ロー
ルフィルムから切り出す際、任意の角度で切り落として
使用できるので、ロールフィルムを無駄なく利用できる
。その意味からして生産性が一段と向上させることがで
きる。また素子の厚さをガラス基板より薄くできるので
液晶表示素子として軽量、薄型化、更に曲面化という目
的を十分に満足することができる。Furthermore, since it has a birefringence of 5×10 −4 or less, it can be cut off at any angle when cutting from a roll film, so the roll film can be used without wasting it. In this sense, productivity can be further improved. In addition, since the thickness of the element can be made thinner than that of a glass substrate, it is possible to fully satisfy the objectives of making the liquid crystal display element lighter, thinner, and curved.
図１は本発明のフィルム（ａ）と従来の二軸延伸フィル
ム（ｂ）の巾方向各部の複屈折率を示すグラフである。FIG. 1 is a graph showing the birefringence of each part in the width direction of the film (a) of the present invention and the conventional biaxially stretched film (b).
Claims (5)
ラスチックスフィルムの一対の間に液晶物質を挾持する
電圧印加型液晶表示素子に於て該プラスチックスフィル
ムが縦横の延伸倍率比略々１で同時二軸延伸して製造し
た物であることを特徴とするプラスチックス液晶表示素
子。(1) In a voltage application type liquid crystal display element in which a liquid crystal material is sandwiched between a pair of transparent conductive plastic films having a transparent conductive thin film on the surface, the plastic film has a stretching ratio of approximately 1. 1. A plastic liquid crystal display element manufactured by simultaneous biaxial stretching in step 1.
ある特許請求の範囲第１項記載のプラスチックス液晶表
示素子。(2) A plastic liquid crystal display element according to claim 1, wherein the plastic is polyethylene terephthalate.
内のポリエチレンテレフタレートフィルムであることを
特徴とする特許請求の範囲第１項記載のプラスチックス
液晶表示素子。(3) The plastic liquid crystal display element according to claim 1, wherein the plastic film is a polyethylene terephthalate film with a thickness variation of within 5%.
ジウム又は金の薄膜である特許請求の範囲第１項記載の
プラスチックス液晶表示素子。(4) The plastic liquid crystal display element according to claim 1, wherein the transparent conductive thin film is a thin film of indium oxide or gold containing tin oxide.
−＾４以下である特許請求の範囲第１項記載のプラスチ
ックス液晶表示素子。(5) Birefringence of plastic film is 5×10^
A plastic liquid crystal display element according to claim 1, wherein the plastic liquid crystal display element is -^4 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16332586A JPS6318327A (en) | 1986-07-11 | 1986-07-11 | Plastic liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16332586A JPS6318327A (en) | 1986-07-11 | 1986-07-11 | Plastic liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6318327A true JPS6318327A (en) | 1988-01-26 |
Family
ID=15771701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16332586A Pending JPS6318327A (en) | 1986-07-11 | 1986-07-11 | Plastic liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6318327A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555240A (en) * | 1993-05-21 | 1996-09-10 | Semiconductor Energy Laboratory Co., Ltd. | Process for fabricating a liquid crystal display with switching elements formed in a substrate |
| US11163182B2 (en) | 2009-04-07 | 2021-11-02 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535325A (en) * | 1978-09-04 | 1980-03-12 | Teijin Ltd | Liquid crystal display body |
-
1986
- 1986-07-11 JP JP16332586A patent/JPS6318327A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535325A (en) * | 1978-09-04 | 1980-03-12 | Teijin Ltd | Liquid crystal display body |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555240A (en) * | 1993-05-21 | 1996-09-10 | Semiconductor Energy Laboratory Co., Ltd. | Process for fabricating a liquid crystal display with switching elements formed in a substrate |
| US11163182B2 (en) | 2009-04-07 | 2021-11-02 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
| US11243420B2 (en) | 2009-04-07 | 2022-02-08 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
| US11906826B2 (en) | 2009-04-07 | 2024-02-20 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
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