SYSTEME D'AFFICHAGE EN COULEURS A SEQUENCE DE TRAMES ET PROCEDE D'UTILISATION D'UNE CELLULE A CRISTAL LIQUIDE POUR UN TEL SYSTEME

• Main Author: PHILIP J. BOS ET PHILIP A. JOHNSON JR
• Format: Patent
• Language: French
• Published: 16.11.1984
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

L'INVENTION CONCERNE UN SYSTEME D'AFFICHAGE EN COULEURS A SEQUENCE DE TRAMES.LE PROBLEME A RESOUDRE RESIDE DANS LA PRODUCTION D'UNE IMAGE A CONTRASTE ELEVE DES COULEURS ET A RESOLUTION ELEVEE DANS UNE GAMME ETENDUE DE TAILLES D'IMAGES.SUIVANT L'INVENTION, CE SYSTEME D'AFFICHAGE 10 COMPORTE UN COMMUTATEUR DE COULEURS COMPORTANT UN DISPOSITIF RETARDATEUR 12 REALISANT UN RETARD VARIABLE, DES FILTRES PLEOCHROIQUES 14 ET 16 ET UN FILTRE POLARISEUR LINEAIRE 18.APPLICATION NOTAMMENT AUX COMMUTATEURS DE COULEURS FORMES DE CELLULES A CRISTAUX LIQUIDES. A field sequential color display system incorporates a color switch which includes a zero to half-wave optical retarder and pleochroic filters to provide an image with high color contrast and resolution over a broad range of display sizes. In a preferred embodiment, a liquid crystal cell which operates between two states of optical retardation comprises the variable retarder to provide a color switch with substantially reduced optical response times.