Projection type display, a display and a drive method thereof
US7136035B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2002 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | May 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection type display is provided that can change a quantity of light emitted to a light modulation device without changing the intensity of light emission from a lamp and exhibits superiority in an image expression and adaptability to an operational environment. This includes an illumination device, a liquid crystal light valve modulating light emitted from the illumination device and a projection lens projecting light modulated by the liquid crystal light valve. This illumination device is provided with a light source and a fly-eye lens, making illumination distribution of light incident from the light source uniform and a liquid crystal element for light adjustment, which is disposed on an optical axis of light emitted from the light source and adjusts a quantity of light emitted from the light source. Hence, a quantity of light per unit time emitted from the illumination device is adjustable by driving a liquid crystal element for light adjustment with the time-sharing based on information from outside.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.