Color filter and color picture display device using the same
US6141124A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 23, 1997 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Oct 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/201
- WIPO fieldOptics
- WIPO sectorInstruments
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
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.