Bistable device for reflection display with inverse contrast

Details Bistable device for reflection display with inverse contrast Bistable device for reflection display with inverse contrast

G - Physics

02

F

G02F 1/139 (2006.01)

Patent

CA 2409708

The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation d¿c?.DELTA.n¿c? close to .lambda.¿0?/4.

La présente invention concerne un dispositif bistable comprenant un matériau cristal liquide, des moyens d'alignement, qui orientent le cristal liquide pour permettre deux textures stables ou métastables, des moyens pour appliquer des signaux électriques qui permettent de commuter entre les textures, un polariseur (10), associé à la face avant du dispositif, placé à l'intérieur ou à l'extérieur de celui-ci, un élément (60) réflectif, spéculaire ou diffusant, placé sur la face arrière du cristal liquide, à l'intérieur ou à l'extérieur du dispositif, permettant à la lumière de passer deux fois dans le dispositif et de retourner vers l'observateur ou ves des éléments optiques supplémentaires, et un compensateur (20), placé entre le polariseur et l'élément réflectif, avec un retard optique dc.DELTA.nc proche de .lambda.o/4.

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