Patent Number: 6,310,673

Title: Transmissive optical polarizing filters designed to maximize a desired portion of a spectral output

Abstract: This invention provides a complementary color polarizer using a single polarizing film followed by a stack of two or more retarders. In a preferred embodiment, the color polarizers of this invention produce orthogonally polarized complementary primary colors (red/cyan, green/magenta, or blue/yellow). This invention further provides color filters which utilize the color polarizers of this invention in combination with a polarization separator to separate the orthogonally polarized colors. The polarization separator can be passive, such as a polarizing beam splitter, or active, such as a switchable polarizer. The switchable polarizer can employ a nematic or a smectic liquid crystal cell. Two color filters of this invention can be cascaded to provide a three color (RGB) filter with an off-state. In combination with a monochrome display or camera, the color filters of this invention provide color displays or cameras.

Inventors: Sharp; Gary D. (Boulder, CO)

Assignee: University Technology Corporation

International Classification: G02F 1/01 (20060101); G02F 1/13 (20060101); G02F 1/1347 (20060101); G02B 27/28 (20060101); G02F 1/23 (20060101); H04N 9/31 (20060101); H04N 5/66 (20060101); H04N 5/74 (20060101); G02F 001/133 ()

Expiration Date: 10/30/2018