JPS6073522A - Liquid crystal display element - Google Patents

Liquid crystal display element

Info

Publication number
JPS6073522A
JPS6073522A JP18028683A JP18028683A JPS6073522A JP S6073522 A JPS6073522 A JP S6073522A JP 18028683 A JP18028683 A JP 18028683A JP 18028683 A JP18028683 A JP 18028683A JP S6073522 A JPS6073522 A JP S6073522A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
sealing
display element
sealing material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP18028683A
Other languages
Japanese (ja)
Inventor
Noboru Itsukida
五木田　昇
Masaru Sasaki
賢 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP18028683A priority Critical patent/JPS6073522A/en
Publication of JPS6073522A publication Critical patent/JPS6073522A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells

Landscapes

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

Abstract

PURPOSE:To increase the adhesion area, where a sealing material is brought closely into contact with substrates, to improve the reliability of sealing, by expanding one of two plastic substrates in a seal entrance part of a liquid crystal in comparison with the other to make a step. CONSTITUTION:Facing peripheral parts of two plastic substrates 11 and 12 whose facing surfaces are provided with electrode patterns are adhered to each other with an organic sealing material while leaving the seal entrance part of the liquid crystal as it is to form an envelope, and the liquid crystal is sealed into the envelope from the seal entrance part, and said seal entrance part is sealed up with a sealing material 17 to constitute a liquid crystal display element. In this liquid crystal display element, one of two plastic substrates 11 and 12 is expanded in said seal entrance part in comparison with the other to make a step. Since the adhesion area of the sealing material 17 consists of an end face 11a and an expanded face 12b by making a step between substrates 11 and 12 in this manner, the adhesion area where a sealing material 3 is brought closely into contact with substrates is widened. Thus, the reliability of sealing is improved.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は液晶表示素子に係り、特にプラスチック基板を
用いた液晶表示素子の封止構造の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid crystal display element, and more particularly to an improvement in the sealing structure of a liquid crystal display element using a plastic substrate.

〔発明の背景〕[Background of the invention]

プラスチック基板を用いた液晶表示素子として、第１図
に示すように電極基板として単にプラスチック基板１１
２、例えば２軸延伸のポリエチレンテレフタレートフィ
ルム（以下ＰＥＴフィルムという）を用いたものと、第
２図に示すように電極基板として偏光板に電極基板機能
をもたせた偏光プラスチック基板１１．１２を用いたも
のが知られている。As a liquid crystal display element using a plastic substrate, as shown in FIG. 1, a plastic substrate 11 is simply used as an electrode substrate.
2. For example, a biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET film) was used, and as shown in FIG. 2, a polarizing plastic substrate 11 and 12 in which a polarizing plate had an electrode substrate function was used as an electrode substrate. something is known.

第１図に示す液晶表示素子は、電極が形成された２枚の
上下プラスチック基板１．２の周囲をシール材３でシー
ルし、図示しない封入口より内部に液晶４を封入し、前
記封入口を封止してなる。The liquid crystal display element shown in FIG. 1 is constructed by sealing the periphery of two upper and lower plastic substrates 1.2 on which electrodes are formed with a sealing material 3, filling a liquid crystal 4 inside through a not-shown filling opening, and It becomes sealed.

そして、特にツィステッド拳ネマチック型の液晶表示素
子では、前記上下プラスチック基板１．２の外側にそれ
ぞれ偏光板５．６を貼り合せで透過型を形成し、また偏
光板６の外側に反射板７を貼り合せで反射属を形成しで
いる。Particularly in the case of a twisted nematic type liquid crystal display element, polarizing plates 5.6 are bonded to the outside of the upper and lower plastic substrates 1.2 to form a transmissive type, and a reflecting plate 7 is attached to the outside of the polarizing plate 6. A reflective element is formed by pasting them together.

第２図に示す液晶表示素子の上下偏光プラスチック基板
１１．１２は、第３図に示すように偏光子１３を２枚の
一軸延伸ＰＥＴフィルムの支持体１４．１４でサンドイ
ッチにした偏光板構造よりなる。そして、かかる上下偏
光プラスチック基板１１．１２の表面にそれぞれ透明導
電膜（ＩＴＯ電極）を形成し、エツチングを行なうこと
により必要な電極パターン１５．１６を形成する。次に
液晶分子の配向のための処理（例えばラビングによる）
を行なう。続いて上下偏光プラスチック基板１１，１２
をシール材３により貼り合せた後、図示しない封入口よ
り液晶４を封入し、前記封入口を封止してなる。次に反
射板７を貼り合せて反射型を形成している。The upper and lower polarizing plastic substrates 11.12 of the liquid crystal display element shown in FIG. 2 have a polarizing plate structure in which a polarizer 13 is sandwiched between two uniaxially stretched PET film supports 14.14 as shown in FIG. Become. Then, transparent conductive films (ITO electrodes) are formed on the surfaces of the upper and lower polarizing plastic substrates 11 and 12, respectively, and necessary electrode patterns 15 and 16 are formed by etching. Next, treatment for alignment of liquid crystal molecules (e.g. by rubbing)
Do this. Next, upper and lower polarized plastic substrates 11 and 12
After bonding them together with a sealing material 3, a liquid crystal 4 is sealed through a sealing port (not shown), and the sealing port is sealed. Next, a reflective plate 7 is attached to form a reflective type.

以下、第２図に示すように偏光プラスチック基板１１．
１２を用いた液晶表示素子Ｃごついて説明する。Hereinafter, as shown in FIG. 2, a polarizing plastic substrate 11.
The liquid crystal display element C using 12 will be explained.

ところで、プラスチックを基板とする液晶表示素子は、
プラスチック基板１１，１２を薄型化できることが最大
の特徴とされている。しかしながら、従来の液晶表示素
子の液晶の封入口部は、第４図に示すように上下プラス
チック基板１１．１２の同一面よりなる端面１１ａ、１
２ａにあるので、封入口部を封止する封止材１７の接着
面積は前記端面１１ａ、１２ａとなり、接着面積が非常
に小さく、封止の信頼性が悪いという欠点があった。By the way, liquid crystal display elements using plastic as a substrate are
The greatest feature is that the plastic substrates 11 and 12 can be made thinner. However, as shown in FIG. 4, the liquid crystal filling opening portion of a conventional liquid crystal display element has end faces 11a and 1 formed from the same surface of the upper and lower plastic substrates 11 and 12.
2a, the bonding area of the sealing material 17 for sealing the sealing inlet portion is the end surfaces 11a and 12a, which has the disadvantage that the bonding area is very small and the sealing reliability is poor.

また前記封止材１７は紫外線硬化型樹脂が用いられる。Further, the sealing material 17 is made of ultraviolet curing resin.

紫外線硬化型樹脂は、一般にラジカル重合性のポリウレ
タン系アクリレートを分子内にもつ有機ポリマーをいう
。しかしながら、この紫外線硬化型樹脂は、一般にプラ
スチック、特にポリエステル樹脂への接着力が乏しいの
で、前記のように封止材１７の接着面積が非常に小さい
ことにより、更に封止の信頼性を低下させでいる。Ultraviolet curable resin generally refers to an organic polymer having radically polymerizable polyurethane acrylate in its molecule. However, since this ultraviolet curable resin generally has poor adhesion to plastics, especially polyester resin, the adhesive area of the sealing material 17 is extremely small as described above, further reducing the reliability of the sealing. I'm here.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、封止の信頼性を向上させることができ
る液晶表示素子を提供することにある。An object of the present invention is to provide a liquid crystal display element that can improve sealing reliability.

〔発明の概要〕[Summary of the invention]

本発明は、対向面に電極パターンが形成された２枚のプ
ラスチック基板の対向間層辺部を液晶の封入口部を残し
て有機シール材で接着して外囲器を形成し、前記封入口
部より外囲器内部に液晶を封入し、前記封入口部を封止
材で封止しでなる液晶表示素子ｌこおいで、前記封入口
部の前記２枚のプラスチック基板の一方を他方に対して
伸ばし、段違いに形成したことを特徴とする。In the present invention, an envelope is formed by bonding the opposing interlayer side parts of two plastic substrates with electrode patterns formed on their opposing surfaces with an organic sealant, leaving the liquid crystal filling opening. A liquid crystal display element is sealed by sealing a liquid crystal inside the envelope from a part, and sealing the filling opening part with a sealing material, and then placing one of the two plastic substrates in the filling opening part against the other. It is characterized by being stretched and formed into different steps.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を第５図により説明する。なお
、第３図および第４図と同じ部材または相当部材には同
一符号を付し、その説明を省略する。封入口部における
上下プラスチック基板１１．１２の一方のプラスチック
基板１２を伸ばして伸長面１２ｂを形成し、上下プラス
チック基板１１．１２を段違いに形成してなる。このた
め、封止材１７の接着面積は端面１１ａと伸長面１２ｂ
となるので、接着面積は非常に広くなり、封止の信頼性
が向上する。An embodiment of the present invention will be described below with reference to FIG. Note that the same or equivalent members as in FIGS. 3 and 4 are designated by the same reference numerals, and their explanations will be omitted. One of the upper and lower plastic substrates 11.12 in the sealing opening portion is stretched to form an elongated surface 12b, and the upper and lower plastic substrates 11.12 are formed at different levels. Therefore, the bonding area of the sealing material 17 is between the end surface 11a and the elongated surface 12b.
Therefore, the bonding area becomes very large and the reliability of sealing improves.

次ｌこ封止構造のみを第４図および第５図のように変え
、その他は同一条件でそれぞれ液晶表示素子を形成し、
封止部のリークについて実験した結果について述べる。Next, only the sealing structure was changed as shown in FIGS. 4 and 5, and other liquid crystal display elements were formed under the same conditions.
We will discuss the results of an experiment regarding leakage from the sealing section.

厚さ１００μｍの一軸延伸ＰＥＴフィルムを支持体にし
た偏光板をプラスチック基板１１．１２に用い、このプ
ラスチック基板１１，１２上にポリエーテルアミド系樹
脂よりなる配向膜を形成し、エポキシ系シール材により
上下プラスチック基板１１．１２を接着して第２図に示
す外囲器を形成し、外囲器の内部に封入口部より液晶を
封入し、前記封入口部を紫外線硬化型樹脂よりなる封止
材１７で封止し、第４図に示すような封止構造を有する
液晶表示素子と、Ｍ５図に示すような封止構造を有する
液晶表示素子とを作成した。A polarizing plate with a 100 μm thick uniaxially stretched PET film as a support is used as the plastic substrates 11 and 12, an alignment film made of polyetheramide resin is formed on the plastic substrates 11 and 12, and an epoxy sealant is used to form an alignment film on the plastic substrates 11 and 12. The upper and lower plastic substrates 11 and 12 are bonded together to form an envelope shown in FIG. 2, a liquid crystal is sealed inside the envelope from the sealing opening, and the sealing opening is sealed with an ultraviolet curable resin. A liquid crystal display element having a sealing structure as shown in FIG. 4 and a liquid crystal display element having a sealing structure as shown in FIG. M5 were prepared by sealing with material 17.

そして、かかる液晶表示素子を７０℃、９５チＲＨの高
温高湿度下で５００時間放置したところ、第４図に示す
封止構造の液晶表示素子は封止部のリークが約３チの素
子に発生したのに対し、第５図に示す封止構造の液晶表
示素子は０．３チ以下であり、著しく信頼性が向上した
。When such a liquid crystal display element was left for 500 hours at a high temperature and high humidity of 70°C and 95cm RH, the liquid crystal display element with the sealing structure shown in FIG. In contrast, the liquid crystal display element with the sealing structure shown in FIG. 5 had a thickness of 0.3 inches or less, and its reliability was significantly improved.

なお、上記実施例においては、第２図に示すタイプに適
用した場合についで説明したが、第１図に示すタイプに
も適用できることはいうまでもない０ 〔発明の効果〕 本発明によれば、封入口部の２枚のプラスチック基板の
一方を他方に対して伸ばし、段違いに形成してなるので
、封止材の密着する接着面積が増太し、封止の信頼性が
向上する。In addition, in the above embodiment, the case where it is applied to the type shown in FIG. 2 has been explained, but it goes without saying that it can also be applied to the type shown in FIG. 1. [Effect of the Invention] According to the present invention Since one of the two plastic substrates in the sealing opening portion is stretched relative to the other and formed at different levels, the adhesive area to which the sealing material adheres is increased, and the reliability of sealing is improved.

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

第１図、第２図はそれぞれ従来の液晶表示素子の断面回
、第３図は第２図のプラスチック基板の構成を示す説明
図、第４図は従来の封止、構造の説明斜視図、第５図は
本発明の一実施例を示す封止構造の説明斜視図である。 １．２・・・プラスチック基板、３・・・シール材、４
・・・液晶、　１１．１２・・・プラスチック基板、１
２ｂ・・・伸長面、　１５．１６・・・電極パターン、
１７・・・封止材。 第１図 第２図 第３図1 and 2 are cross-sectional views of a conventional liquid crystal display element, FIG. 3 is an explanatory diagram showing the configuration of the plastic substrate of FIG. 2, and FIG. 4 is a perspective view illustrating the conventional sealing and structure. FIG. 5 is an explanatory perspective view of a sealing structure showing an embodiment of the present invention. 1.2...Plastic substrate, 3...Sealing material, 4
...Liquid crystal, 11.12...Plastic substrate, 1
2b... elongated surface, 15.16... electrode pattern,
17... Sealing material. Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 対向面に電極パターンが形成された２枚のプラスチック
基板の対向間層辺部を液晶の封入口部を残しで有機シー
ル材で接着して外囲器を形成し、前記封入口部より外囲
器内部に液晶を封入し、前記封入口部を封止材で封止し
でなる液晶表示素子においで、前記封入口部の前記２枚
のプラスチック基板の一方を他方に対して伸ばし、段違
いに形成したことを特徴とする液晶表示素子。An envelope is formed by bonding the opposing layer sides of two plastic substrates with electrode patterns formed on their opposing surfaces with an organic sealant, leaving the liquid crystal enclosure opening. In a liquid crystal display element in which a liquid crystal is sealed inside a container and the filling opening is sealed with a sealing material, one of the two plastic substrates in the filling opening is stretched relative to the other, and the two plastic substrates are placed at different levels. A liquid crystal display element characterized in that:
JP18028683A 1983-09-30 1983-09-30 Liquid crystal display element Pending JPS6073522A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18028683A JPS6073522A (en) 1983-09-30 1983-09-30 Liquid crystal display element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18028683A JPS6073522A (en) 1983-09-30 1983-09-30 Liquid crystal display element

Publications (1)

Publication Number Publication Date
JPS6073522A true JPS6073522A (en) 1985-04-25

Family

ID=16080552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18028683A Pending JPS6073522A (en) 1983-09-30 1983-09-30 Liquid crystal display element

Country Status (1)

Country Link
JP (1) JPS6073522A (en)

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