Projection-type image display apparatus

Details Projection-type image display apparatus Projection-type image display apparatus

1998-03-30

2000-12-05

Parker, Kenneth

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

353 34, 353 84, G02F 11335

Patent

active

061574201

ABSTRACT:
A projection-type display apparatus includes a light source; a color separating/synthesizing device arranged to divide light from the light source into three different color light rays; and three reflection-type display devices arranged to reflect the three different color light rays, respectively. The color separating/synthesizing device is further arranged to synthesize the three different color light rays respectively reflected by the three reflection display devices. The color separating/synthesizing device has transmittance of substantially 50% for each of a s-polarized light ray having a first wavelength and a p-polarized light ray having a second wavelength. A difference between the first wavelength of the s-polarized light ray and the second wavelength of the p-polarized light ray is equal to or less than 40 nm.

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Hornbeck, "Current Status of the Digital Micromirror Device (DMD) for Projection Television Applications", 0-7803-1450-6, IEEE, IEDM 1993, pp. 381-384.

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