Patent ID: 8860768

Claim:
A display device, comprising: a gray scale value counting module, operatively receiving image data of each frame and generating a gray scale value counting signal according to the image data of each frame; a ratio generating module coupled to the gray scale value counting module, operatively generating a ratio value signal according to the gray scale value counting signal; a first sub-frame function module coupled to the ratio generating module, operatively receiving the image data of each frame and the ratio value signal, creating a first gamma curve function according to a first formula and the ratio value signal, and generating first sub-frame image data according to the first gamma curve function and the image data of each frame; a second sub-frame function module coupled to the ratio generating module, operatively receiving the image data of each frame and the ratio value signal, creating a second gamma curve function according to a second formula and the ratio value signal, and generating second sub-frame image data according to the second gamma curve function and the image data of each frame; and a display panel coupled to the first sub-frame function module and the second sub-frame function module, operatively configured for displaying a first sub-frame image according to the first sub-frame image data and displaying a second sub-frame image according to the second sub-frame image data, wherein the first formula is F 1 ( g )=x·ƒ 1 ( g )+(1−x)·f 1 ( g )′, the second formula is F 2 ( g )=x·ƒ 2 ( g )+(1−x)·f 2 ( g )′, where x represents a ratio value of the ratio value signal, 0≦x≦1, F 1 ( g ) represents the first gamma curve function, F 2 ( g ) represents the second gamma curve function, f 1 ( g ) represents a first gamma curve sub-function, f 2 ( g ) represents a second gamma curve sub-function, f 1 ( g )′ represents a third gamma curve sub-function, and f 2 ( g )′ represents a fourth gamma curve sub-function, wherein a gamma value of the display device corresponds to an original gamma curve function, the f 1 ( g ) and the f 2 ( g ) are separated from the original gamma curve function according to a first predetermined average gray scale value, the first predetermined average gray scale value are greater than a minimum gray scale value of the original gamma curve function and less than a maximum gray scale value of the original gamma curve function, the f 1 ( g ) and the f 2 ( g ) have no intersection point in the range from greater than the minimum gray scale value to less than the maximum gray scale value, the f 1 ( g )′ and the f 2 ( g )′ are separated from the original gamma curve function according to the first predetermined average gray scale value, and the f 1 ( g )′ and the f 2 ( g )′ have an intersection point in the first predetermined average gray scale value.