Patent ID: 8531368
Filing Date: 2013-09-10
Classification: G09G,H04N

Abstract:
1. A transmissive liquid crystal display device comprising: a liquid crystal panel whose pixels are each divided into four subpixels, namely red (R), green (G), blue (B), and white (W) subpixels; a white active backlight whose light emission luminance is controllable; a color-saturation conversion section that performs a color-saturation reduction process using a formula including a gamma coefficient on pixel data high in luminance and color saturation, from among pixel data contained in a first input RGB signal serving as an input image, and thereby converts the first input RGB signal into a second input RGB signal; a gamma-correction section that converts the second input RGB signal into a third input RGB signal by performing a gamma-correction process using the gamma coefficient on the second input RGB signal; wherein, before the color saturation reduction process is performed, no gamma correction is performed on the pixel data on which the color-saturation reduction process is to be performed; an output signal generation section that generates, from the third input RGB signal, respective transmittance signals of the R, G, B, and W subpixels in each pixel of the liquid crystal panel and calculates a backlight value of the active backlight; a liquid crystal panel control section that drives and controls the liquid crystal panel in accordance with the transmittance signals generated by the output signal generation section; and a backlight control section that controls the light emission luminance of the backlight in accordance with the backlight value calculated by the output signal generation section.