Patent ID: 8983220
Filing Date: 2015-03-17
Classification: G09G

Abstract:
1. An error diffusion method comprising: receiving original pixel data for a block of pixels, determining a gain of each pixel based on a ratio in quantity of light of the block of pixels depending on whether or not a local dimming is performed, and modulating each original pixel data based on the gain of each pixel; simultaneously receiving first to nth (n is a positive integer of 2 or larger) pixel data of the modulated pixel data that include an error of quantization relating to the local dimming applied to the block of pixels at every clock; adding a quantization error of previous pixel data stored in a memory to each of the currently inputted first to (n−1)th pixel data and quantizing them into data having a smaller number of bits than the number of input bits; adding the quantization error of previous pixel data stored in the memory to the currently inputted nth pixel data and quantizing it into data having a smaller number of bits than the number of input bits; diffusing the quantization errors of the first to (n−1)th pixel data to nearby pixels excluding the first to nth pixels by using a first error diffusion mask, and storing the diffusion results of the quantization errors of the first to (n−1)th pixel data in the memory; and diffusing the quantization error of the nth pixel data to pixels around the nth pixel by using a second error diffusion mask, and storing the diffusion results of the quantization error of the nth pixel data in the memory, wherein the first to nth pixel data are simultaneously quantized by using the first error diffusion mask and the second error diffusion mask.