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US 6,896,375 B2Granted
Rear projection display device having multiple mirrors that are substantially parallel to a screen
AssigneeInFocus Corporation
InventorsMark David Peterson, Jeffrey Alan Gohman
Life of this patent
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Abstract
The ultra-thin rear projection display device described herein includes a wide angle lens system and one or more planar mirrors that are parallel to a screen on which an image is to be displayed. In one embodiment, the screen that has multiple groove angles to provide better illumination than screens with a single groove angle.
Claims37
A display device comprising:
- a screen;
- a lens system to project an image, the lens system having an optic axis;
- a substantially planar back plate mirror to reflect the image to the screen substantially parallel to the screen;
- and
- a substantially planar intermediate mirror to reflect the image projected by the lens system to the back plate mirror, the intermediate mirror being substantially parallel to the back plate mirror, wherein the intermediate mirror is substantially perpendicular to the optic axis of the lens system.
2 more elements
A method comprising:
- projecting an image with a wide angle lens system having an optic axis;
- reflecting the image projected by the lens system to the mirror with an intermediate mirror, wherein the intermediate mirror is planar and substantially parallel to the screen and substantially perpendicular to the optic axis of the lens system;
- and
- reflecting the image to a screen with a planar mirror, wherein the planar mirror is substantially parallel to the screen, and further wherein the optic axis of the wide angle lens system is substantially perpendicular to the mirror.
1 more element
Dependencies are inferred from the claim text.