Patent ID: 7330172

Claim:
An image display device, comprising: a light source; a display panel, which outputs light from the light source by controlling intensity of the light according to a level of a video signal; a light source control section to control an output of the light source according to an output signal that is generated according to a level of the video signal, the light source control section including, a comparing section to compare the video signal with a previous output signal, and a characteristic changing section to vary an output of the light source according to the result of comparison, wherein the comparing section is a difference calculating circuit that calculates a difference of the video signal and the previous output signal, and wherein the characteristic changing section includes: a coefficient section, which outputs a first coefficient and a second coefficient according to the difference; a first multiplier, which calculates a first product of the video signal and the first coefficient; a second multiplier, which calculates a second product of the previous output signal and the second coefficient; and an adder, which calculates a sum of the first product and the second product.