Patent ID: 8670079

Claim:
A video display device which displays an image of an input video signal, comprising: a frequency component analyzing device that receives the input video signal and extracts a frequency of each of frequency bands from video information of one screen with respect to the image; and an image quality control circuit that performs an image quality control of the image based on a distribution of the extracted frequencies of each of the frequency bands, wherein the image quality control device performs image quality control processes for all of a linear compensation of contrast, a black level offset, a color correction, a sharpness, and a noise reduction function based on the distribution of the extracted frequencies of each of the frequency bands, wherein the image quality control circuit comprises a contrast enhancer, a black level shifter, a color enhancer, a picture sharpness unit, and a noise reducing device, each of which is connected to an output of the frequency component analyzing device and receives the distribution of the extracted frequencies of each of the frequency bands output from the frequency component analyzing device, wherein the contrast enhancer is configured to change a level of the contrast to a higher contrast level to generate a characteristic curve of the contrast with a larger gamma correction when the image of the video signal is determined as containing many low frequency components, and generate a linear characteristic curve of the contrast when the image of the video signal is determined as containing many high frequency components, wherein the black level shifter is configured to fix the black level when the image of the video signal is determined as containing many low frequency components, and shift an offset position of the black level to a brighter position when the image of the video signal is determined as containing many high frequency components, wherein the color enhancer is configured to lower a tuning accuracy of Y-C delay to advance a timing of color C from a timing of luminance Y when the image of the video signal is determined as containing many low frequency components, and raise the tuning accuracy of the Y-C delay such that a center of the color C matches a center of the luminance Y when the image of the video signal is determined as containing many high frequency components, wherein the picture sharpness unit is configured to enlarge amounts of edges of the video signal to raise the sharpness when the image of the video signal is determined as containing many low frequency components, and reduce the amounts of the edges of the video signal when the image of the video signal is determined as containing many high frequency components, and wherein the noise reducing device is configured to perform the noise reduction function when the image of the video signal is determined as containing many low frequency components, and inhibit performing the noise reduction function when the image of the video signal is determined as containing many high frequency components.