Patent ID: 7906184
Filing Date: 2011-03-15
Classification: C09K,G02B,G02F

Abstract:
1. An optical film for VA mode, comprising: a polarizer; a first optical compensation layer having a refractive index profile of nx>ny=nz; and a second optical compensation layer having a refractive index profile of nx>ny>nz in the stated order, wherein: the first optical compensation layer comprises a λ/2 plate; the second optical compensation layer consists of a λ/4 plate; the second optical compensation layer is formed of at least one polymer selected from the group consisting of polyimide, polyamide, polyetherketone, polyamideimide, and polyesterimide; an angle formed between an absorption axis of the polarizer and a slow axis of the first optical compensation layer is +17° to +27° or −17° to −27°; an angle formed between the absorption axis of the polarizer and a slow axis of the second optical compensation layer is +85° to +95°; and an Nz coefficient of the second optical compensation layer is 1.2≦Nz≦2.