Optical display device, program for controlling the optical display device, and method of controlling the optical display device
US7453475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2005 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Jan 4, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0428
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Exemplary embodiments of the invention provide an optical display device that modulates light from a light source in two stages through an optical modulator and a luminance adjusting element to expand the luminance dynamic range and the number of the gradation levels of a display image, that allows the picture quality to be enhanced, and that is suitably applied to display an image according to the resolution of the luminance adjusting element having a higher resolution than the optical modulator. Exemplary embodiments provide a projection type display device that converts RGB pixel values in HDR display data into YCbCr pixel values, selects the maximum Ymax from corresponding YCbCr values on a pixel-basis in a color modulation light valve, and calculates average values Cbave and Crave. The device converts YCbCr pixel values consisting of these values into RGB pixel values, determines the transmittance T1 of each of the pixels in the color modulation light valve using the RGB value, then determines the transmittance T2 of each of the pixels in the luminance modulation light valve based on the transmittance T1, and determines control values for the light valves based on the values T…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.