Patent ID: 6151093
Filing Date: 2000-11-21
Classification: C09K,G02F

Abstract:
A liquid crystal display device comprising:a pair of spaced apart substrates;a liquid crystal layer disposed between said pair of substrates, having an unstrained pitch of approximately twice as large as a spacing between said substrates, and said liquid crystal layer having a bistable character with a plurality of states including a stable state with a twist angle w.sub.0 and first and second metastable states, where w.sub.0 is a twist angle along a direction of thickness of the liquid crystal layer at an initial stable state; andwherein a first pulse voltage is applied to each of said substrates to induce transition from the initial stable state to a homeotropic state for said liquid crystal layer, and subsequently a second pulse voltage is applied to relax said liquid crystal layer from the homeotropic state selectively to either said first or second metastable state based on a shape of the second pulse voltage,wherein the liquid crystal layer is composed such that the unstrained pitch of the liquid crystal layer increases with temperature to suppress a change of switching characteristics with temperature of said liquid crystal display device.