Projection lens and display device

Details Projection lens and display device Projection lens and display device

2006-10-17

2006-10-17

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S680000, C348S744000

Reexamination Certificate

active

07123426

ABSTRACT:
A wide angle projection lens include a first lens group of negative refractive power that has at least one aspheric surface. The wide angle projection lens can output an image at a half field angle of at least 45°, where the image has substantially no distortion and requires little or no keystone correction. The wide angle projection lens can be part of an optical engine that can be implemented in rear projection or front projection display devices.

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Stupp, E.H. & Brennesholtz, M.S.; Projection Displays; John Wiley & Sons Ltd. (1999); pp. 146-150 and pp. 205-208.

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