Patent ID: 7750582
Filing Date: 2010-07-06
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display element; a backlight disposed on a rear side of the liquid crystal display element, the backlight comprising: a first light source; and a second light source different in spectral characteristics from the first light source; a first lighting control means for performing lighting control of the first light source by applying a voltage to the first light source with a predetermined duty ratio; a second lighting control means for performing lighting control of the second light source by applying a voltage to the second light source with a predetermined duty ratio; a temperature detecting means for detecting the temperature inside the liquid crystal display device; and a color sensor for detecting RGB values of light emitted from the backlight, wherein the first lighting control means performs lighting control by applying a voltage to the first light source with a duty ratio of 100% until the temperature detected by the temperature detecting means becomes equal to or greater than a first predetermined temperature, wherein the first light source is composed of cathode fluorescent lamps, and the second light source is composed of light emitting diodes, and wherein the second lighting control means determines the duty ratio for the second light source in proportion to the RGB values detected by the color sensor, and thereby performs lighting control in such a manner that luminous intensity of the light emitting diodes is in proportion to the brightness of the cathode fluorescent lamps.