Patent ID: 7443584

Claim:
A polarizer for a liquid crystal display device, comprising: a polarizer base; a first protective layer and a second protective layer on two sides of the polarizer base for protecting the polarizer base; and an anti-reflection layer on the first protective layer, the anti-reflection layer including a first layer, a second layer, a third layer and a fourth layer stacked in that order, wherein the first and the third layers have a same index of refraction different from another same index of refraction of the second and the fourth layers, a thickness of the first layer is in a range from 7×10 −8 to 9×10 −8 meters, a thickness of the second layer is in a range from 1×10 −7 to 1.2×10 −7 meters, a thickness of the third layer is in a range from 1.5×10 −8 to 3.5×10 −8 meters, and a thickness of the fourth layer is in a range from 1×10 −8 to 2×10 −8 meters.