Illuminating device and projection type video display apparatus
US7434945B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2005 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Jul 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection type video display apparatus is provided with an LED array for emitting light in red, an LED array for emitting light in green, and an LED array for emitting light in blue. On a light-incident side of a rod integrator, time-dividing mirrors 2A, 2B arranged in a cross manner, for guiding the light from each LED array to an inside of the rod integrator, are arranged. Furthermore, on a light-emission side of the LED array for emitting the light in red, a time-diving mirror is arranged, and on a light-emission side of the LED array for emitting the light in blue, a time-dividing mirror is provided. Each time-dividing mirror switch either to reflect the light or to transmit the light, depending on whether or not voltage is applied thereto. At time-dividing lighting timing of the LED arrays, the time-dividing mirrors switch either to reflect the light or to transmit the light. In addition, video signals of videos of respective colors are supplied to a liquid crystal display panel in a time-dividing manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.