Patent ID: 7450091
Filing Date: 2008-11-11
Classification: G09G

Abstract:
1. An apparatus for increasing the display gray levels, said apparatus comprising: a signal transformation circuit for transforming a set of image signals into a set of transformed signals according to a first predetermined manner, wherein the first predetermined manner is to utilize a gamma look up table to transform the set of image signals into the set of transformed signals, each of the image signals has L bits, each of the transformed signals has M bits, and M>L; an error diffusion circuit for receiving the set of transformed signals and generating a set of diffused signals according to a judging rule, wherein the judging rule performs an error diffusion calculation for N high bits and remained (M−N) low bits of each of the transformed signals, so as to generate the set of diffused signals, and each of the diffused signals has N bits; and an operation circuit, according to a second predetermined manner, for transforming the set of diffused signals into a set of temporary signals, and, according to a predetermined operational rule and the set of temporary signals, for generating a set of output image signals, wherein the second predetermined manner is to utilize a first look up table to transform the set of diffused signals into the set of temporary signals, each of the temporary signals has K bits, and N>K, and wherein the predetermined operational rule calculates the set of the temporary signals with a set of masks to generate the set of output image signals, and each of the output image signals has K bits.