Patent ID: 6271905
Filing Date: 2001-08-07
Classification: G02F

Abstract:
A reflective liquid crystal display device comprising:a liquid crystal cell having a pair of first and second substrates, and a liquid crystal layer between the pair of substrates;a sheet of polarizer film on the first substrate;optically reflecting means disposed on the second substrate; anda hybrid tilt optical compensator, either positive or negative, between the polarizer film and the liquid crystal layer, the optical compensator having an optically slow axis when viewed from the direction normal to the compensator, the retardation, Rc, of the compensator satisfying one of the equations:Ron+Rc=.lambda./4+m19 .lambda./2(m=0,1,2 . . . );andRon+Rc=(m+1).multidot..lambda./2(m=0,1,2 . . . ),where Ron is the retardation of the liquid crystal layer when an effective voltage Von is applied to said liquid crystal cell, and .lambda. is the optical wavelength;and, refractive indexes nx, ny, and nz of said optical compensator satisfy the equationnx>ny.apprxeq.nzwhere ny is in an in-plane direction of the optical compensator; the nx of the optical compensator has a tilt angle of 0.degree. to 10.degree. on one side and 60.degree. to 90.degree. on the other side when viewing the optical compensator from the ny direction, and the tilt angle continuously changing within the range of 0.degree.-10.degree. on one side and 60.degree. to 90.degree. on the other side.