Patent ID: 6995816
Filing Date: 2006-02-07
Classification: G02B,G02F

Abstract:
1. An optical device comprising a pair of substantially identical crossed sheet polarizer packages, each package comprising an integrated combination of an absorbing layer and a compensator located on at least one side of said absorbing layer, wherein the compensator comprises a combination including: (A) two A-plates wherein the first A-plate is placed next to the absorbing layer and the second A-plate is next to the first A-plate, wherein the optic axis of the first A-plate is parallel to the transmission axis of the absorbing layer and the optic axis of the second A-plate is perpendicular to the transmission axis of the absorbing layer wherein the first and second A-plates exhibit retardation at a wavelength of 550 nm in the range of (a)−44±11 nm and 115±21 nm, respectively, or, (b) 44±11 nm and −115±21 nm, respectively or (B) an A-plate and a C-plate wherein the A-plate is placed next to the absorbing layer and the C-plate is attached next to the A-plate, and wherein the optic axis of said A-plate is parallel to the transmission axis of the absorbing layer and wherein the A-plate and said C-plate exhibit retardation at a wavelength of 550 nm are in the range of (a) 91±12 nm and 76±12 nm, respectively, or, (b) −91±12 nm and −76±12 nm, respectively, or (C) an A-plate and a C-plate wherein the C-plate is placed next to the absorbing layer and the A-plate is adjacent to the C-plate wherein the optic axis of the A-plate is perpendicular to the transmission axis of the absorbing layer, and wherein the A-plate and the C-plate exhibit a retardation at a wavelength of 550 nm in the range of (a) 45±11 nm and 137±21 nm, respectively, or (b) −45±11 nm and −137±21 nm, respectively.