Patent ID: 8363001
Filing Date: 2013-01-29
Classification: G09G

Abstract:
1. A liquid crystal display device which uses, as backlight of a liquid crystal display panel, white light generated from a light guide plate adapted to mix plural monochromatic lights into white light, said liquid crystal display device comprising: control means for individually controlling the light intensities of plural light sources for said plural monochromatic lights, the plural light sources including red, green, and blue light sources; light detection means for detecting the brightness of the white light of said backlight, the light detection means including red, green, and blue brightness sensors; a temperature detection unit that measures the temperature in the vicinity of said liquid crystal display panel; and a feedback controller that receives the brightness detection value detected by said light detection means and performs a feedback control to said control means in terms of the electric power supplied to said plural light sources such that said brightness detection value is brought into agreement with a set brightness, wherein said feedback controller is configured to modify a value of the detected brightness that is output by said light detection means by performing: a second temperature compensation that sets a second compensation value to compensate for a predetermined temperature-induced fluctuation characteristic of said liquid crystal display panel, which is independent of said light sources, and which causes the spectral transmittance of the liquid crystal display panel to fluctuate according to the change in temperature, the second compensation value being set on the basis of said detected temperature and data stored in a memory representative of said predetermined temperature-induced fluctuation characteristic of said liquid crystal display panel, said feedback controller performs said feedback control on the basis of the modified value of the detected brightness, the gain change coefficient is determined by multiplying the difference between a maximum output value and a minimum output value from said light detection means by a correction coefficient based on a design standard value of the light detection means, and the feedback controller individually performs feedback control of the electric powers supplied to the red, green, and blue light sources to control their light intensities individually.