Projector and drive control of light source lamp for projector

Details Projector and drive control of light source lamp for projector Projector and drive control of light source lamp for projector

2007-11-27

2007-11-27

Mahoney, Christopher (Department: 2862)

Optics: image projectors

Lamp control

Reexamination Certificate

active

10943852

ABSTRACT:
A projection screen including a polarized-light selective reflection layer having a cholesteric liquid crystalline structure that causes selective diffuse-reflection of a specific polarized-light component, and a substrate for supporting the polarized-light selective reflection layer. The polarized-light selective reflection layer includes three partial selective reflection layers, each of which contains molecules of a liquid crystal made from an organic compound, forming an organic film as a whole, and has a cholesteric liquid crystalline structure that causes selective diffuse-reflection of a specific polarized-light component. Each partial selective reflection layer of the polarized-light selective reflection layer is ordered according to wavelength of the range of light reflected. Beginning from the observation side, the order is as follows: blue (B) color wave range, green (G) color wave range, and red (R) color wave range.

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