Color wheel synchronization in multi-frame-rate display systems
US6828961B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2000 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jan 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3179
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display system (200) in which light from source (202) is focused onto a spinning color wheel (204). The spinning color wheel (204) spins at a constant rate and creates of beam of light that changes from one primary color to the next in rapid sequence. The primary colored beam of light impinges a spatial light modulator (206), which is often a DMD or LCD. A controller (208) receives an input video signal and determines the native frame rate of the image source. The controller (208) sends image data to the spatial light modulator (206) in synchronization with the color wheel (204)—image data representing the red portions of the image is sent during the period in which the red color filter is passing through the beam of light—at the native frame rate of the image source. The modulated light is focused onto an image plane (210) by projection lens (212) to form an image. The eye of the viewer integrates the sequential primary color images giving the perception of a single full-color image. The display system uses a single nominal color wheel speed to display input signals having various native frame rates. The nominal color wheel speed is selected to allow the same color w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.