Patent ID: 7242384

Claim:
An image display device, comprising: a liquid crystal panel for displaying an image including RGB colors; a light source for emitting light toward the liquid crystal panel that the liquid crystal panel receives and uses for display operation thereof; at least one optical sensor having a light receiving area corresponding to at least one pixel including R (red), G (green) and B (blue) dots, the optical sensor being arranged immediately above at least one color filter and thus over at least the R, G and B dots for measuring how the liquid crystal panel is emitting R, G, and B light, wherein the R, G and B light emitted by the liquid crystal panel are measured independently from one another by the at least one optical sensor; a temperature sensor and a lamp temperature circuit for determining a temperature of the light source; wherein light emission of the light source is controlled according to a measurement value obtained from the at least one optical sensor in order to correct brightness or chromaticity or both of the liquid crystal panel, and also based upon the temperature of the light source as determined by the temperature sensor and the lamp temperature circuit; wherein a viewing angle of the optical sensor is limited and a measurement area of the optical sensor depends on the viewing angle; and wherein the measurement area of the optical sensor is within 10 degrees upward, downward, leftward, and rightward of a line perpendicular to the liquid crystal panel.