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ITTO921012A1 - Cella a cristallo liquido - Google Patents

Cella a cristallo liquido

Info

Publication number
ITTO921012A1
ITTO921012A1 IT92TO001012A ITTO921012A ITTO921012A1 IT TO921012 A1 ITTO921012 A1 IT TO921012A1 IT 92TO001012 A IT92TO001012 A IT 92TO001012A IT TO921012 A ITTO921012 A IT TO921012A IT TO921012 A1 ITTO921012 A1 IT TO921012A1
Authority
IT
Italy
Prior art keywords
liquid crystal
orientation layers
causes
electrodes
ions
Prior art date
Application number
IT92TO001012A
Other languages
English (en)
Inventor
Stefan Brosing
Jurgen Waldmann
Martin Barnaba
Helmut Thaler
Monika O Stoitzner
Original Assignee
Nokia Technology Gmbh
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 Nokia Technology Gmbh filed Critical Nokia Technology Gmbh
Publication of ITTO921012A0 publication Critical patent/ITTO921012A0/it
Publication of ITTO921012A1 publication Critical patent/ITTO921012A1/it

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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films

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

Secondo lo stato della tecnica nota, al fine di migliorare il contrasto delle celle a cristalli liquidi con struttura a matrice, vengono disposti tra gli elettrodi a strisce delle strisce di copertura impermeabili alla luce. Questo intervento fa si che diminuisca la luminosità del display illuminato posteriormente. Secondo l'invenzione al fine di migliorare il contrasto del display, viene suggerito di incrementare gli strati di orientazione (16), i quali vengono normalmente formati da polimeri e possono venire indicati quasi come isolanti in presenza di una completa polimerizzazione, mediante incremento della conducibilità tramite arricchimento ionico. Questo arricchimento ionico fa si che quando gli elettrodi a strisce 13.1, 13.2 di due piastre di substrato (11.1, 11.2) disposte a distanza l'una rispetto all'altra, vengono sollecitati con una tensione alternata, non solamente le molecole (18) a cristalli liquidi che sono disposte nel campo di incrocio diretto (14) vengono trasformate in un allineamento omeotropo. Il campo elettrico degli elettrodi a strisce (13.1, 13.2) provoca piuttosto uno spostamento degli ioni negli strati di orientazione (16) con la conseguenza che gli ioni si distribuiscono in modo ordinato negli strati di orientazione. Questo allineamento delle posizioni di carica fa si che anche le molecole a cristalli liquidi che sono disposte a distanza laterale fra due elettrodi a strisce di una piastra di substrato assumano un allineamento omeotropo.
IT92TO001012A 1991-12-17 1992-12-16 Cella a cristallo liquido ITTO921012A1 (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4141528A DE4141528C2 (de) 1991-12-17 1991-12-17 Flüssigkristallzelle mit Streifenelektroden und Orientierungsschichten

Publications (2)

Publication Number Publication Date
ITTO921012A0 ITTO921012A0 (it) 1992-12-16
ITTO921012A1 true ITTO921012A1 (it) 1993-06-17

Family

ID=6447208

Family Applications (1)

Application Number Title Priority Date Filing Date
IT92TO001012A ITTO921012A1 (it) 1991-12-17 1992-12-16 Cella a cristallo liquido

Country Status (4)

Country Link
JP (1) JPH05346576A (it)
DE (1) DE4141528C2 (it)
IT (1) ITTO921012A1 (it)
NL (1) NL9202160A (it)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001125A1 (de) * 1980-01-14 1981-07-16 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung einer fluessigkristallanzeige
DE3243649A1 (de) * 1982-11-25 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Feldeffekt-fluessigkristallanzeige
SU1531867A3 (ru) * 1984-07-10 1989-12-23 Ббц Аг Браун, Бовери Унд Ко (Фирма) Жидкокристаллический индикатор
EP0353760A3 (en) * 1988-08-03 1991-01-16 TDK Corporation Liquid crystal elements and conductive organic compound film-forming compositions
DE3925970A1 (de) * 1989-08-05 1991-02-07 Hoechst Ag Elektrisch leitfaehige polymere und ihre verwendung als orientierungsschicht in fluessigkristall-schalt- und -anzeigeelementen

Also Published As

Publication number Publication date
JPH05346576A (ja) 1993-12-27
ITTO921012A0 (it) 1992-12-16
DE4141528A1 (de) 1993-06-24
DE4141528C2 (de) 1995-04-06
NL9202160A (nl) 1993-07-16

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Legal Events

Date Code Title Description
0003 Withdrawn