Color filter and color picture display device using the same

Details Color filter and color picture display device using the same Color filter and color picture display device using the same

1997-10-23

2000-10-31

Schuberg, Darren

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 19, 359485, 359502, 349 5, 349 63, 349 95, G02B 532

Patent

active

061411248

ABSTRACT:
A color filter which, in a reflection type color picture projector using a polarized light component as a projection light, improve the utilization factor of light and a color picture display device using the same color filter are provided. The color filter 3 using a transmission type hologram diffracts and spectroscopically separates P polarized light components related to respective primary colors and condenses them to pixel electrodes 13r, 13g, and 13b on the side of an LCD panel 1. A reflection light which is modulated by an optical modulator 16 on the side of the LCD panel 1 and becomes S polarized light component is incident on the color filter 3. The color filter 3 transmits the S polarized light component and uses it as the projection light. Since the color filter 3 can diffract a P polarized light component at diffraction efficiency of about 100% while restricting the diffraction efficiency of S polarized light component to about 3%, which is substantially advantageous compared with diffraction of S polarized light component, the utilization factor of light can be improved

REFERENCES:
patent: 4807978 (1989-02-01), Grinberg et al.
patent: 5486934 (1996-01-01), Huang
patent: 5608552 (1997-03-01), Smith
patent: 5784181 (1998-07-01), Loiseaux et al.

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