Optical display device, program for controlling the optical display device, and method of controlling the optical display device

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 Yfrom corresponding YCbCr values on a pixel-basis in a color modulation light valve, and calculates average values Cband Cr. The device converts YCbCr pixel values consisting of these values into RGB pixel values, determines the transmittance Tof each of the pixels in the color modulation light valve using the RGB value, then determines the transmittance Tof each of the pixels in the luminance modulation light valve based on the transmittance T, and determines control values for the light valves based on the values Tand T