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Display driver and driving method

A display driver and display device technology, applied to static indicators, instruments, etc., can solve problems such as loss of image quality, and achieve the effect of improving use efficiency

Inactive Publication Date: 2010-11-24
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is no need to perform overdrive processing on the non-moving parts of the screen. If overdrive processing is used, the image quality may be damaged instead.

Method used

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  • Display driver and driving method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0102] "Regional Segmentation of LCD Screen"

[0103] figure 1 It is a diagram explaining the area division of the screen of the liquid crystal display device according to the first embodiment of the present invention mounted on a mobile phone terminal.

[0104] figure 1 The mobile phone terminal 101 shown in (A) has a liquid crystal screen 102 . Here, the area near the center of the screen in the liquid crystal screen 102 is called the screen center 103 , and the area near the edge of the screen is called the screen peripheral 104 . For example, in the liquid crystal screen 102, the portion obtained by removing 10% of the vertical length at the upper and lower end portions and 10% of the horizontal length at the left and right end portions can be regarded as the screen center portion 103, and the A portion that is not the center portion 103 of the screen serves as the peripheral portion 104 of the screen. Here, the ratio of the lengths and the shapes of the central port...

no. 2 approach

[0179] Figure 8 It is a diagram explaining the area division of the screen of the liquid crystal display device according to the second embodiment of the present invention mounted on the mobile phone terminal.

[0180] Figure 8 The area division of the liquid crystal screen of the second embodiment shown in the figure 1 In addition to the three regions A ( 105 ), B ( 106 ), and C ( 107 ) of the liquid crystal screen in the first embodiment shown, a fourth region Z ( 108 ) is added. But when Figure 8 In the shown second embodiment, the overdrive process is omitted for the pixels to which the added fourth zone Z (108) belongs. That is, data compression by the image compression unit 2233 of the overdrive calculation unit 223, storage in the frame memory 224, and data expansion by the image expansion unit 2233 are omitted for pixels belonging to the fourth zone Z (108). As a result, the storage capacity of the frame memory 224 can be saved for the pixels in the outermost p...

no. 3 approach

[0189] Figure 11 It is a diagram showing the configuration of the overdrive calculation unit 223 of the display driver 220 according to the third embodiment of the present invention.

[0190] Figure 11 The overdrive computing unit 223 of the third embodiment shown with Figure 9 The overdrive calculation unit 223 of the second embodiment shown is the same, including a region determination unit 2231 , a compression rate calculation unit 2232 , an image compression unit 2233 , an image expansion unit 2234 , an overdrive processing unit 2235 , and a multiplexer 2236 . But when Figure 11 In the third embodiment shown, an overdrive permission decision unit 2237 is further added to the overdrive calculation unit 223 . Moreover, in Figure 11 In the overdrive calculation unit 223 of the third embodiment shown, the overdrive permission determination unit 2237 is supplied with the area A ( 105 ), area B ( 106 ), and area C ( 107) The data compression ratio R A , R B , R C Th...

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Abstract

The present invention is directed to improve efficiency in use of a memory for storing display data which is used for an overdrive process. A display driver for driving a display device compresses image display data, stores the compressed data into a memory, and generates a preceding frame by decompressing the data read from the memory. A setting unit divides a display screen of the display device into, for example, a first region as a center part and a second region as a peripheral part. An overdrive computing unit generates overdrive display data in response to a present-time frame and the preceding frame, compresses the image display data in the first and second regions at first and second data compression ratios of small and large values, respectively, and stores the compressed data into the memory. By saving the space of the memory, the picture quality in the first region is improved.

Description

technical field [0001] The present invention relates to a display driving device and an operating method thereof, and particularly relates to a technology capable of effectively improving the use efficiency of a memory used in an overdrive process for shortening a response time of a display device. Background technique [0002] Small liquid crystal displays mounted on mobile phone terminals, etc., tend to be unable to use high-speed liquid crystal displays used in stationary televisions due to cost and size constraints. In recent years, the demand for watching moving images such as terrestrial digital broadcasting (one-segment broadcasting) through mobile phone terminals has also increased. [0003] If a low-speed liquid crystal is used to display a dynamic image, it may take longer than the frame interval to change the grayscale of the pixel to the target value, and sometimes even when the next frame of data should be displayed, the target grayscale cannot be reached. Dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133
CPCG09G2340/16G09G2320/0252G09G3/3611G09G2320/0261G09G2354/00
Inventor 内田裕介片山由加利赤井亮仁黑川能毅
Owner RENESAS ELECTRONICS CORP
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