Patent ID: 6577361
Filing Date: 2003-06-10
Classification: G02F

Abstract:
A liquid crystal display device comprising:a liquid crystal cell formed by opposedly disposing a transparent first substrate and a transparent second substrate with a predetermined space therebetween, and filling a liquid crystal layer therein, which gives optical change to incident light by applying voltage on said liquid crystal cell; a first polarizer provided on the outside of said first substrate which is on a visible side of said liquid crystal cell; a second polarizer provided on the outside of said second substrate which is on an opposite side to the visible side of said liquid crystal cell; and an auxiliary light source provided on the opposite side of said second polarizer with respect to said liquid crystal cell, wherein a third polarizer to enhance the polarization degree when an emitted light from said auxiliary light source is emitted to the liquid crystal cell side as a polarized light through said second polarizer is provided between said second polarizer and said auxiliary light source, said first polarizer is an absorption-type polarizer in which one polarization axis is a transmission axis and another polarization axis intersecting to the transmission axis at nearly right angles is an absorption axis, said second polarizer is a reflection-type polarizer in which one polarization axis is a transmission axis and another polarization axis intersecting to the transmission axis at nearly right angles is a reflection axis, which is composed such that a plurality of complex layers formed by combining a layer having nearly equal refractive indices in a direction and in a direction orthogonal thereto, and a layer having different refractive indices in a direction and in a direction orthogonal thereto are laminated, said third polarizer is an absorption-type polarizer in which one polarization axis is a transmission axis and another polarization axis intersecting to the transmission axis at nearly right angles is an absorption axis or a reflection-type polarizer in which one polarization axis is a transmission axis and another polarization axis intersecting to the transmission axis at nearly right angles is a reflection axis, said first polarizer and said second polarizer are disposed such that the transmission axes thereof intersect at right angles, and said second polarizer and said third polarizer are disposed such that the transmission axes thereof form an angle from 0Â° to plus or minus 30Â°.