Single-path color video projection systems employing...

Details Single-path color video projection systems employing... Single-path color video projection systems employing...

2005-01-04

2005-01-04

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C353S099000, C359S853000, C359S858000, C362S302000

Reexamination Certificate

active

06839095

ABSTRACT:
A multimedia projector (100) includes a single-path frame-sequential color optical system in which light rays emitted by a light source (14) propagate through a color wheel (102) and an optical integrator (16, 120, 122), and are directed toward a transflective polarizing beam splitter (40) that separates them into P-polarized components (76) and S-polarized components (78). The P-polarized components are transmitted toward a reflective LCD (26) in which pixels in a dark state reflect the light rays without a polarization change and return them through the transflective polarizing beam splitter, whereas pixels in a bright state reflect the light rays with a 90° polarization change as S-polarized light rays (112), which are reflected by the transflective polarizing beam splitter toward a projection lens (27).

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