| 摘要 |
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 Y<SUB>max </SUB>from corresponding YCbCr values on a pixel-basis in a color modulation light valve, and calculates average values Cb<SUB>ave </SUB>and Cr<SUB>ave</SUB>. The device converts YCbCr pixel values consisting of these values into RGB pixel values, determines the transmittance T 1 of each of the pixels in the color modulation light valve using the RGB value, then determines the transmittance T 2 of each of the pixels in the luminance modulation light valve based on the transmittance T 1 , and determines control values for the light valves based on the values T 1 and T 2.
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