JPH027018A - 表示装置 - Google Patents

表示装置

Info

Publication number
JPH027018A
JPH027018A JP63158570A JP15857088A JPH027018A JP H027018 A JPH027018 A JP H027018A JP 63158570 A JP63158570 A JP 63158570A JP 15857088 A JP15857088 A JP 15857088A JP H027018 A JPH027018 A JP H027018A
Authority
JP
Japan
Prior art keywords
linear
liquid crystal
polarizing plate
phase element
retarder
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
JP63158570A
Other languages
English (en)
Inventor
Shigeru Yoshida
茂 吉田
Katsuhiko Kumakawa
克彦 熊川
Hiroshi Yamazoe
山添　博司
Isao Ota
勲夫 太田
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP63158570A priority Critical patent/JPH027018A/ja
Priority to EP88309210A priority patent/EP0311339B1/en
Priority to DE3854491T priority patent/DE3854491T2/de
Priority to US07/254,085 priority patent/US5166817A/en
Priority to KR1019880013104A priority patent/KR920009824B1/ko
Publication of JPH027018A publication Critical patent/JPH027018A/ja
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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133636—Birefringent elements, e.g. for optical compensation with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers
    • 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
    • G02F1/1393—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 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • 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
    • G02F1/1396—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 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • 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
    • G02F1/1396—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 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • G02F1/1397—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 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC cells
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、文字や記号、あるいは画像の表示を行う表示
装置に関する。
従来の技術 近年、液晶表示装置は薄型、軽量と云う特徴によりパー
ソナルコンピュータ、ワードプロセッサなどの端末表示
や薄型テレビなどの映像表示に用いられている。
最近、直線偏光板、二層に重畳された液晶層、直線偏光
板からなる液晶表示装置が注目されている（例えば日経
マイクロデバイス、昭和６２年１０月１日号）この方式
は大容量表示においても、無彩色、白黒表示が可能であ
り、その表示品位はＣＲＴ表示のそれをも凌ぐものであ
る。
発明が解決しようとする課題 しかしながら、前記のような構成の表示装置の場合、ひ
とつの表示装置において、液晶層が二層必要となり生産
性において繁雑となると同時に生産コストも上昇すると
云う課題を有している。
課題を解決するための手段 上記課題を解決するために、本発明の表示装置は、第１
直線偏光板、第１直線位相子、ツィステッド・ネマチッ
ク液晶層、第２直線位相子、第２直線偏光板の順に積層
されてなる表示装置を提供するものである。
尚、第１直線位相子並びに第２直線位相子は共に屈折率
異方性を有するセルロースを主成分とするシートで構成
されるか、又は、第１直線位相子（又は第２直線位相子
が）セルロースを主成分とするシートで構成され、又は
第２直線位相子（又は第１直線位相子）が同じく屈折率
異方性を有する透光性プラスチックフィルムで構成され
ることを特徴としている。
作用 本発明は、前記したような構成を有するものであり、こ
れによって従来の二層の重畳された液晶層を有する白黒
表示装置と同程度の表示品位を容易に又、低コストで実
現可能にしたものである。
実施例 以下、本発明の表示装置の一実施例を図面を参照しなが
ら説明する。
第１図は本発明の一実施例に於ける液晶表示装置の構成
斜視図である。同図において１は光源、２は第１直線偏
光板、３は第１直線位相子、４゜５はガラス基板、６．
７は透明電極層、８は液晶層、９は第２直線位相子、１
０は第２直線偏光板である。液晶層８はツイストされた
Ｐ型ネマチック液晶から形成されている。第２図は各構
成要素の位置関係を示す。同図は光源と逆の位置から表
示装置を見た場合に対応する。同図において１）は第１
直線偏光軸、１２は第１直線位相子の屈折率の大きい方
の方向を示す。１３は光源側ガラス基板壁での液晶分子
の長軸の方向であり、液晶分子は液晶層が光源から遠ざ
かるに従がって、反時計方向にツイストしている。１５
は第２直線位相子の屈折率の大きい方の方向性を示す。
１６は第２直線偏光板の偏光軸であり、１）と直交して
いる。この実施例の場合、第２直線位相子としてトリア
セテート、ジアセテート、普通セロハン、防湿膜をコー
トしたセロハンを使用し、第１の直線位相子としては前
記第２の直線位相子に使用したものと同種のトリアセテ
ート、ジアセテート、普通セロハン、防湿膜をコートし
たセロハン並びにポリエステル、ポリエーテルサルホン
、ポリビニルアルコール、ボリアリレート、ポリ塩化ビ
ニル、ポリプロピレンを使用した。又、この時の各シー
トの屈折率異方性と厚み（μｍ）の積は、第１の直線位
相子がほぼ０．１０になるようにし、又、第２の直線位
相子はほぼ０．７５になるように各、調整した。尚、１
３すなわち、光源側ガラス基板壁での液晶分子の長軸の
方向は１５０°、１４すなわち、もう一方のガラス基板
での液晶分子の長軸の方向は３０°で、液晶層８の液晶
分子交差角は２４０°である。又、使用した液晶の屈折
率異方性と液晶層の厚み（μｍ）の積はほぼ０．８５に
なるようにした。
この本実施例の表示装置に、電圧を無印加にするかある
いは比較的低い電圧を印加すると可視の光出力は極めて
弱い。液晶層８にデユーティ１／４００の駆動電圧を印
加した場合、直線位相子として使用した各シートおよび
各組合せは選択絵素は通常の例えば１／１６の９０°Ｔ
Ｎと同程度の明るさがあり、コントラストは２０程度あ
った。１０の第２直線偏光板の偏光軸並びに３の第１直
線位相子並びに９の第２直線位相子の屈折率の大きい方
の方向は第２図の設定からずらしてもコントラストや表
示の明るさは優れた状態を維持する。又、第１および第
２の直線位相子に使用するシートおよび組合せによって
はずらした方が特性の向上する場合もある。但し、この
時、ノーマリ−・ブランクの状態で優れた特性を維持す
るためには１０の第２直線偏光板の偏光軸の設定は２の
第１偏光板とほぼ直交する必要があった。又、本発明の
構成において、第１直線位相子に使用した各シートの屈
折率異方性と厚み（μｍ）の積はほぼ０．１になるよう
にし、第２直線位相子に使用した各シートの屈折率異方
性と厚み（μｍ）の積はほぼ０．７５になるようにした
が、両直線位相子共にこの値が例えば、これより大きい
又は小さくても第１直線位相子および第２直線位相子の
位置を変化させることによって白黒の表示を現出させる
事も合せて確認している。尚、第１並び第２直線位相子
に使用する各シートは屈折率異方性と厚み（μｍ）の積
の値が満されるのであれば複数枚の構成シートでも格別
問題はない。又、それらシートの混構成でも特性は得ら
れている。尚、又、第１図の構成において光源のみを逆
側（第２直線偏光板側）においても本発明の効果は発揮
される。又、反射板を追加された場合においても同様の
結果が得られた。この時は光源を必ずしも要せず外光に
よってもよい。
発明の効果 以上のように本発明は、ツイスト・ネマチック液晶二層
方式表示装置と比肩し得る表示特性を提出し得る表示装
置を容易に、又、安価に供給するものであり、産業的価
値は大きい。
【図面の簡単な説明】
第１図は本発明の一実施例における液晶表示装置の構成
斜視図、第２図は各構成要素の位置関係を示す構成図で
ある。 １・・・・・・光源、２・・・・・・第１直線偏光板、
３・・・・・・第１直線位相子、４，５・・・・・・ガ
ラス基板、６．７・・・・・・透明電極層、８・・・・
・・液晶層、９・・・・・・第２直線位相子、１０・・
・・・・第２直線偏光板、１）・・・・・・第１直線偏
光板の偏光軸、１２・・・・・・第１直線位相子の屈折
率の大きい方の方向、１３・・・・・・光源側ガラス基
板壁での液晶分子の長軸の方向、１４・・・・・・もう
一方のガラス基板壁での液晶分子の長軸の方向、１５・
・・・・・第２直線位相子の屈折率の大きい方の方向、
】６・・・・・・第２直線偏光板の偏光軸。

Claims (3)

    【特許請求の範囲】
  1. （１）第１直線偏光板、第１直線位相子、ツィステッド
    ・ネマチック液晶層、第２直線位相子、第２直線偏光板
    の順に積層されてなることを特徴とする表示装置。
  2. （２）第１直線位相子並びに第２直線位相子が屈折率異
    方性を有するセルロースを主成分とするシートである請
    求項（１）記載の表示装置。
  3. （３）第１直線位相子又は第２直線位相子がセルロース
    を主成分とするシートで構成され、又、第２直線位相子
    又は第１直線位相子が同じく屈折率異方性を有する透光
    性プラスチックフィルムで構成される請求項（１）記載
    の表示装置。
JP63158570A 1987-10-07 1988-06-27 表示装置 Pending JPH027018A (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP63158570A JPH027018A (ja) 1988-06-27 1988-06-27 表示装置
EP88309210A EP0311339B1 (en) 1987-10-07 1988-10-04 Liquid crystal display
DE3854491T DE3854491T2 (de) 1987-10-07 1988-10-04 Flüssigkristallanzeige.
US07/254,085 US5166817A (en) 1987-10-07 1988-10-06 Liquid crystal display with compensation means of multiaxially elongated high polymer films
KR1019880013104A KR920009824B1 (ko) 1987-10-07 1988-10-07 액정표시장치

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63158570A JPH027018A (ja) 1988-06-27 1988-06-27 表示装置

Publications (1)

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JPH027018A true JPH027018A (ja) 1990-01-11

Family

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JP63158570A Pending JPH027018A (ja) 1987-10-07 1988-06-27 表示装置

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JP (1) JPH027018A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0266517A (ja) * 1988-09-01 1990-03-06 Matsushita Electric Ind Co Ltd 表示装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61189521A (ja) * 1985-02-19 1986-08-23 Citizen Watch Co Ltd 液晶表示装置
JPS61219933A (ja) * 1985-03-26 1986-09-30 Citizen Watch Co Ltd 液晶表示装置
JPS62203124A (ja) * 1986-03-03 1987-09-07 Seiko Epson Corp 液晶表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61189521A (ja) * 1985-02-19 1986-08-23 Citizen Watch Co Ltd 液晶表示装置
JPS61219933A (ja) * 1985-03-26 1986-09-30 Citizen Watch Co Ltd 液晶表示装置
JPS62203124A (ja) * 1986-03-03 1987-09-07 Seiko Epson Corp 液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0266517A (ja) * 1988-09-01 1990-03-06 Matsushita Electric Ind Co Ltd 表示装置

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