Patent ID: 7511786

Claim:
A reflective liquid crystal display device comprising: a first and second substrates arranged facing each other; a liquid crystal layer including liquid crystal material sealed between the first and second substrates and having negative dielectric anisotropy, and having Î”nÂ·d (the product of refractive index anisotropy Î”n of liquid crystal and cell gap d) of 150 nm or more and 500 nm or less; and a light reflective plate formed at the first substrate, wherein liquid crystal material is nematic liquid crystal (including nematic liquid crystal not added with chiral) having chiral pitch of double or more of the cell gap d, wherein a first phase difference plate is arranged between a polarizing plate and liquid crystal layer, the first phase difference plate having negative refractive anisotropy to a vertical direction to the substrate, and retardation dfÂ·{(nx+ny)/2âˆ’nz} of the first difference plate being almost in the following range: 0.4â‰¦[ dp Â·{( nx+ny )/2 âˆ’nz }]/( dlcÂ·Î”n )â‰¦0.7 where, dp: Thickness of the first phase difference plate nx, ny, nz: Refractive index of xyz axes directions dlc: Thickness of the liquid crystal layer Î”n: Difference of refractive indexes of extraordinary ray ne and ordinary ray no of liquid crystal molecules.