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Image display device

By combining frame interpolation processing, time-sharing grayscale processing and overshoot driving technology in the liquid crystal display device, the problem of dynamic image blur and suspected outline caused by insufficient response speed is solved, and the dynamic image display performance is significantly improved.

Inactive Publication Date: 2010-01-13
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The second reason is to use a hold-type display element that keeps the brightness approximately constant during one video frame period.
Regarding this point, Patent Document 2 describes that when an image display device having a hold-type display element displays a moving image, the moving image is blurred as the viewer's line of sight is followed.

Method used

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no. 1 approach

[0119] figure 1 It is a block diagram showing the configuration of the liquid crystal display device 1 according to the first embodiment of the present invention. figure 1 The shown liquid crystal display device 1 comprises: a timing control circuit 11; a frame interpolation processing circuit 20; a time-sharing grayscale processing circuit 40; an overshoot processing circuit 50; a previous subframe storage circuit 60; a grayscale change detection circuit 70 ; driving circuit 80 ; and pixel array 90 . The liquid crystal display device 1 performs three types of processing (frame interpolation processing, time-division grayscale processing, and overshoot processing) on ​​the video signal V1, and performs grayscale display using the obtained video signal V2. In the present embodiment, the frame interpolation processing circuit 20 corresponds to a video conversion circuit that obtains a video signal in units of subframes based on a video signal input in units of frames.

[012...

no. 2 approach

[0161] Figure 17 It is a block diagram showing the configuration of the liquid crystal display device 2 according to the second embodiment of the present invention. Figure 17 The shown liquid crystal display device 2 comprises: a timing control circuit 12; a simple double-speed processing circuit 30; a time-sharing grayscale processing circuit 40; an overshoot processing circuit 50; a previous subframe storage circuit 60; a grayscale change detection circuit 70 ; drive circuit 80 ; and pixel array 90 . The liquid crystal display device 2 performs three types of processing (simple double-speed processing, time-division gradation processing, and overshoot processing) on ​​the video signal V1, and performs gradation display using the obtained video signal V2. In the present embodiment, the simple double-speed processing circuit 30 corresponds to a video conversion circuit that obtains video signals in units of subframes based on video signals input in units of frames. In each...

no. 3 approach

[0171] Figure 24 It is a block diagram showing the configuration of the liquid crystal display device 3 according to the third embodiment of the present invention. Figure 24 The shown liquid crystal display device 3 comprises: a timing control circuit 13; a frame interpolation processing circuit 20; a simple double-speed processing circuit 30; a time-sharing grayscale processing circuit 40; an overshoot processing circuit 50; a previous subframe storage circuit 60 ; a gray scale change detection circuit 70 ; a drive circuit 80 ; and a pixel array 90 . The liquid crystal display device 3 performs four types of processing (frame interpolation processing, simple double-speed processing, time-division grayscale processing, and overshoot processing) on ​​the video signal V1, and performs grayscale display using the obtained video signal V2. In the present embodiment, the frame interpolation processing circuit 20 and the simple double-speed processing circuit 30 correspond to a vid...

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PUM

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Abstract

A frame interpolation process circuit (20) performs an interpolation process on a video signal(V1) in a frame unit. A time division gradation process circuit (40) performs a gradation level conversion to distribute luminance of one-frame period to two sub-frame periods: a first half and a latter half. A gradation level change detection circuit (70) detects whether the gradation level has changed between continuous sub-frames for each of pixels. To a pixel which has changed the gradation level, an overshoot process circuit (50) outputs a video signal obtained by performing a gradation level conversion for emphasizing a signal temporal change on an output signal of the frame interpolation process circuit (20) instead of the output signal of the time division gradation process circuit (40). The circuit configuration may further include a predetermined multiplication process circuit to replace the frame interpolation process circuit (20). This improves the dynamic display performance while satisfying the response speed of the display element.

Description

technical field [0001] The present invention relates to an image display device such as a liquid crystal display device or an electroluminescent display device. Background technique [0002] In an image display device such as a liquid crystal display device, when displaying a moving image, there is a problem that the boundary portion with different display luminances is blurred. The deterioration in the display performance of such moving images is caused by the following two factors. The first reason is that the response speed of the display element is slower than one frame period of the video. Overshoot driving (also referred to as overdrive) is known as a technique for making up for the lack of response speed of such a display element. The so-called overshoot drive refers to the method of forcibly driving the display element at high speed by applying a voltage higher or lower than the voltage used to obtain the desired gray level according to the change direction (up or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG09G3/2025G09G2320/0266H04N7/014G09G2340/16G09G5/00G09G3/2081G09G2320/0252G09G2310/08G09G2340/0435G09G3/3648G09G2320/0261G09G2320/0271
Owner SHARP KK
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