Detecting and eliminating method for ghosting effect of LCD
AssigneeFlextronics Computing Mauritus Ltd.
InventorsChao-Hua Lee, Jong-Dae Oh, Xiao-Song Zhou, C.-C. Jay Kuo
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Abstract
Methods for detecting and eliminating a ghosting effect of liquid crystal display (LCD) are disclosed. The ghosting effect detecting method comprises the steps of providing a visual persistency period, providing a maximum color alternation speed of the LCD, obtaining a threshold value by multiplying the human visual persistency period by the maximum color alternation speed, calculating a variation of an intensity level of each of the plurality of pixel components of the LCD and comparing the threshold value and the variation of the intensity level to obtain a comparison result to determine whether the ghosting effect exists in the pixel component.
Claims9
A method for eliminating a ghosting effect of a liquid crystal display (LCD) device having a plurality of pixel elements, comprising:
- (a) calculating a threshold value for the maximum permissible change in the intensity value of a pixel element of the plurality of pixel elements from one frame of displayed video to a next frame of displayed video by multiplying a visual persistence period and a maximum color alternation speed of the LCD device;
- (b) for each pixel of the plurality of pixel elements, calculating a variation of an intensity level from one frame of input video data to a next frame of the input video data;
- (c) for each pixel of the plurality of pixel elements, if the variation of the intensity level of the pixel is greater than the threshold value, changing the intensity level of the pixel based upon the threshold value so as to make the variation of the intensity level of the pixel no greater than the threshold value;
- and
- (d) for each pixel of the plurality of pixel elements, if the variation of the intensity level of the pixel is greater than the threshold value, displaying the changed intensity level of the pixel rather than the intensity level of the pixel element from the input video data;
- wherein changing the variation of the intensity level in this manner minimizes the ghosting effect that is visible to a human viewing the LCD device.
Dependencies are inferred from the claim text.