LIQUID CRYSTAL DISPLAY DEVICE

摘要

PURPOSE: To obtain electro-optical characteristics of the distinct threshold and sufficiently fast optical response characteristics and to enable low voltage driving by approximately paralleling liquid crystal molecules near a substrate boundary to substrates and forming the liquid crystal molecules into a specific spiral structure. CONSTITUTION: Liquid crystals 4 are held between a rear surface substrate 18 and a front surface substrate 19. These liquid crystals 4 attain an AWT mode which is a WT mode and in which the liquid crystal molecules 4a at the boundary part between both substrates 18 and 19 are oriented nearly parallel with the substrate surfaces. Multichromatic dyestuff and the cholesteric liquid crystals or chiral agents as optically active materials are incorporated into the liquid crystals 4 and the liquid crystal molecules 4a have the spiral structure provided with spiral axis in the cell thickness direction by the optically active materials. Further, the ratio of the natural pitch (ρ0 ) of the spiral structure generated by the optically active materials and the cell thickness (d) satisfies the relation (2θ-π)/4π