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Multi-frame overdriving circuit and method for LCD and overdriving unit

A liquid crystal display and overdrive technology, applied to static indicators, instruments, etc., can solve the problem that the image quality cannot be improved, and achieve the effect of smooth transmittance curve and reduced dynamic smear

Active Publication Date: 2008-06-11
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the dynamic smears A', B' and C' are maintained for more than two frame periods, the traditional double-frame overdrive technology cannot make complete compensation, resulting in a sudden change in the transmittance curve of liquid crystal molecules in the third frame period The concave situation is shown in Figure 2B, where the solid line represents the curve of the overdriven pixel voltage versus time, and the dotted line represents the curve of the transmittance versus time. In this way, the image screen will be cannot improve the quality of

Method used

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  • Multi-frame overdriving circuit and method for LCD and overdriving unit
  • Multi-frame overdriving circuit and method for LCD and overdriving unit
  • Multi-frame overdriving circuit and method for LCD and overdriving unit

Examples

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no. 1 example

[0030] FIG. 3 is a block diagram of the first embodiment of the multi-frame overdrive circuit of the liquid crystal display of the present invention. The multi-frame overdriving circuit 300 includes a counting unit 310 , a counting register 320 and a multi-frame overdriving unit 330 . The counting unit 310 is used for counting the frame number m for which the pixel data corresponding to a single pixel is maintained at the first gray scale value, where m is a positive integer. The frame number m corresponds to the time length for which the pixel data corresponding to a single pixel is maintained at the first gray scale value. That is to say, if the pixel data of the single pixel all display the first gray scale value in m consecutive frames, the counting unit 310 will calculate the number m of the frames. The multi-frame overdrive unit 330 is used for when the pixel data corresponding to the pixel changes from the first grayscale value to the second grayscale value in the firs...

no. 2 example

[0047] FIG. 6 is a block diagram of the second embodiment of the overdrive unit of the liquid crystal display of the present invention. The overdrive unit 600 includes a double-frame overdrive circuit 610 and a multi-frame overdrive circuit 620 . The double frame overdrive circuit 610 includes a frame register 612 , a first overdrive unit 614 and a second overdrive unit 616 . The frame register 612 receives and stores pixel data Data corresponding to a pixel.

[0048] When the pixel data Data corresponding to this pixel changes from the first grayscale value to the second grayscale value corresponding to the first frame period, the first overdrive unit 614 according to the first grayscale value and the second grayscale value, The first overdrive pixel data OD1 is output during the first frame period. The second overdrive unit 616 outputs second overdrive pixel data OD2 in a second frame period adjacent to the first frame period according to the first grayscale value and the ...

no. 3 example

[0056]FIG. 7 is a block diagram of a third embodiment of an overdrive unit of a liquid crystal display according to the present invention. The overdrive unit 700 includes a single frame overdrive circuit 710 and a multiple frame overdrive circuit 620 . The single frame overdrive circuit 710 includes a frame register 712 and an overdrive unit 714 . The frame register 712 receives and stores pixel data corresponding to a pixel.

[0057] When the pixel data corresponding to this pixel changes from the first grayscale value to the second grayscale value corresponding to the first frame period, the overdrive unit 714 performs the first grayscale value and the second grayscale value according to the first grayscale value and the second grayscale value at the first The frame period outputs the first overdrive pixel data OD1. The first grayscale value substantially corresponds to the previous image frame, and the second grayscale value substantially corresponds to the current image ...

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Abstract

The invention discloses a multiple frame overdriving circuit of liquid crystal displayer, which comprises a counting unit and a multiple frame overdriving unit. The counting unit counts the periodic number m of pixel data corresponding to pixel maintaining in the first gray-scale value, wherein m is positive integer. When the pixel data corresponding to pixel is in a first frame period, the multiple frame overdriving unit respectively outputs y multiple frame overdriving pixel data corresponding to pixel within y continuous frame periods starting from the first frame period after the first gray-scale value is converted into a second gray-scale value. y multiple frame overdriving pixel data are relevant with the first gray-scale value, the second gray-scale value and frame period m, wherein y is a positive integer. The invention further discloses the multiple frame overdriving method and the overdriving unit of liquid crystal displayer.

Description

technical field [0001] The invention relates to a multi-frame overdrive circuit, method and overdrive unit of a liquid crystal display, and in particular to a multi-frame overdrive circuit, method and overdrive unit of a liquid crystal display capable of reducing dynamic smear. Background technique [0002] The response time of the liquid crystal molecules is related to the voltage across the two terminals of the liquid crystal molecules. Therefore, in order to increase the response speed of the liquid crystal molecules, an overdriving technique must be used to increase the response speed of the liquid crystal molecules. Faced with today's increasingly larger LCD panels, a double-frame (2frame) overdrive technology is used to improve the response time of the overall liquid crystal molecules to compensate for the corresponding video images. [0003] FIG. 1 is a schematic diagram of a traditional double-frame overdrive circuit. The double-frame overdrive circuit 100 includes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 洪明吉廖致霖施鸿民
Owner AU OPTRONICS CORP