Patent ID: 7271828

Claim:
A device for preventing burn-in of a display screen of an image display device, the device comprising: a blurring device for applying a blurring process to a single screen of an input image signal, without shifting an image represented by the input image signal, to obtain a single screen of a blurred image signal; and a contrast inversion device for inverting contrast of a luminance level of the single screen of the blurred image signal to generate a single screen of a burn-in prevention image signal, and wherein pixel data of the single screen of the input image signal is grouped into a plurality of pixel blocks, each pixel block includes N rows×M columns of pixels, and the blurring device includes a quantizer that quantizes the pixel data of the single screen of the input image signal for each pixel block, and wherein a quantization level of the quantizer increases successively for a series of screens of the input image signal, and when the quantization level reaches its highest level, then the quantization level returns to its lowest level.