Patent ID: 6172722
Filing Date: 2001-01-09
Classification: G02F

Abstract:
A chromaticity compensating filter, comprising:a first stage, comprising:a first and a second linear polarizer, at least one of the first and second polarizers being a color polarizer; anda first tuning unit positioned between the first and second polarizers and switchable between a first state wherein the polarization of light is orthogonally transformed and a second state wherein the polarization is unchanged; anda second stage in series with the first stage, comprising:the second linear polarizer and a third linear polarizer, at least two of the first, second and third polarizers being color polarizers; anda second tuning unit positioned between the second and third polarizers and switchable between a first state wherein the polarization of light is orthogonally transformed and a second state wherein the polarization is unchanged,wherein the first stage normally transmits a first subtractive primary color and the second stage normally transmits a second subtractive primary color.