Optical system with angular compensator

Details Optical system with angular compensator Optical system with angular compensator

2007-01-23

2007-01-23

Dowling, William C. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S122000, C349S075000, C349S117000, C349S119000

Reexamination Certificate

active

10770846

ABSTRACT:
An electro-optical projection system includes a polarizer, a reflective light modulator, an analyzer, and a compensation element. The polarizer polarizes an illumination beam to form a polarized illumination beam. The reflective light modulator receives the polarized illumination beam along a first optical path, modulates the polarized illumination beam to form an imaging beam, and reflects the imaging beam along a second optical path. The compensation element is disposed in the polarized illumination beam and the imaging beam to compensate for polarization aberrations resulting from the birefringent property of the material of the reflective light modulator. The compensation plate has a retardation generally equal in magnitude and opposite in sign as compared to the retardation of the liquid crystal material of the reflective light modulator.

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