Ferroelectric liquid crystal screen with localized zigzag defects and opacified electrodes in the non-switchable area of the screen and processes for obtaining spacers and treating said screen

US5138473A · kind A · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Jean Dijon · Le Pont-de-Claix, FR
• Christine Ebel · Grenoble, FR
• Aime Perrin · Meylan, FR

Key dates

• Filing date: Jul 24, 1991
• Grant date: Aug 11, 1992
• Expiry date: Jul 24, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/13392
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Ferroelectric liquid crystal screen with opacified electrodes in the non-switchable area of the screen and processes for obtaining spacers and treating said screen. On each part of each row or column electrode of the screen, facing a gap separating two column or row electrodes is arranged an element (40,50) preventing the passage through the screen of light reaching the latter in the direction of the element. The elements located on the row electrodes (32) or those located on the column electrodes (34) also permit the spacing, without electrical connection, of the screen plates and the localization of the zigzag defects which the liquid crystal may have, in or in the vicinity of the non-switchable area of the screen. The screen is appropriately heated and an alternating voltage is applied between the electrodes in order to localize the zigzag defects of the liquid crystal in the vicinity of the spacing elements. In order to obtain the latter, it is possible to irradiate a positive resin layer through the plate intended to carry these elements and previously provided with opaque layers on the parts corresponding thereto.