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Display device, display panel driver and method of driving a display panel

A display device and display panel technology, applied to static indicators, instruments, optics, etc., can solve the problems of increased power consumption and achieve the effect of reducing power consumption

Active Publication Date: 2007-11-21
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large data transfer is required to rewrite the LUT
Large amount of data transfer results in increased power consumption, which is especially problematic for LCD devices used in mobile terminals

Method used

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  • Display device, display panel driver and method of driving a display panel
  • Display device, display panel driver and method of driving a display panel
  • Display device, display panel driver and method of driving a display panel

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0035] (The overall structure)

[0036] FIG. 1 is a block diagram showing the configuration of a system including a liquid crystal display (LCD) device 1 according to an embodiment of the present invention. The LCD device 1 is provided with an LCD panel 2 , a controller driver 4 , a scan line driver 5 and a backlight 8 for illuminating the LCD panel 2 . The LCD device 1 is configured to display images on the LCD panel 2 in response to various data and control signals sent from the image display circuit 3 .

[0037] The image display circuit 3 generates input grayscale data D corresponding to an image to be displayed on the LCD panel 2 IN , and provide it to the controller driver 4. In this embodiment, the input gray scale data D IN It is 6-bit data. The input gray scale data D associated with the red pixel (R pixel) of the LCD panel 2 will be IN Called the input grayscale data D IN R . Similarly, the input grayscale data D associated with green pixels (G pixels) and bl...

no. 3 example

[0146] In the third embodiment, the selected correction point data set CP_sel R , CP_sel G and CP_sel B It is selected according to the frequency distribution of the input grayscale data of each frame image, not according to the APL of the frame image; and thus realizes the conversion of the gamma value γ used in the gamma correction. In other words, the frequency distribution of the input gray scale data is used as an indication of the brightness of each frame image, and the gamma value γ used in the gamma correction is converted according to the brightness of each frame image. For the purpose of converting the gamma value γ according to the frequency distribution of the input grayscale data, the correction point data calculation circuit 13B shown in FIG. 9 is used instead of the correction point data calculation circuit shown in FIG. 2 in the third embodiment. 13.

[0147] The correction point data calculation circuit 13B is provided with a correction point data storage r...

no. 4 example

[0155] According to the fourth embodiment, not only the gamma value γ is converted according to the frequency distribution of the input grayscale data, but also the correction point data CP0 to CP5 are corrected according to the frequency distribution of the input grayscale data, and thus it is possible to better control The contrast of the image. As described above, the correction point data CP0 to CP5 are basically determined by equation (1a) or (1b). In the fourth embodiment, the correction point data CP1 and CP4 among the correction point data CP0 to CP5 determined by the equation (1a) or (1b) are corrected according to the frequency distribution of the input grayscale data, and thus The contrast of the image can be controlled more appropriately. For the purpose of converting the gamma value γ according to the frequency distribution of the input grayscale data and further correcting the correction point data CP1 and CP4, a correction point data calculation circuit 13C sho...

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Abstract

An LCD device (1) according to the present invention has: an LCD panel (2); an operation and correction circuit (14) configureured to perform a correction operation with respect to an input gray-scale data of a target frame image by using an arithmetic expression to generate an output gray-scale data; a data line driver (15 to 17) configureured to drive the LCD panel (2) in accordance with the output gray-scale data; and a correction data calculation circuit (13) configureured to generate a correction data that specifies a relationship between the input gray-scale data and the output gray-scale data of the target frame image, depending on the input gray-scale data of the target frame image or an input gray-scale data of a precedent frame image followed by the target frame image. The operation and correction circuit (14) determines coefficients of the arithmetic expression from the correction data.

Description

technical field [0001] The invention relates to a display device and a method for driving a display panel. In particular, the present invention relates to a technique for satisfactorily adjusting gray scales on a display panel by correcting gray scale data. Background technique [0002] In recent years, mobile terminals such as mobile phones or PDAs (Personal Data Assistants) have been required to support the function of displaying movies. For example, a mobile phone supporting digital terrestrial broadcasting is one of the key products of a mobile phone manufacturer. [0003] One problem is that small LCD (Liquid Crystal Display) devices of mobile terminals have poor display quality of movies compared to CRT (Cathode Ray Tube) or large LCD devices, especially poor contrast characteristics when the image is not bright enough. In the LCD device of a mobile terminal, the brightness of its backlight is set low from the viewpoint of reducing electric power consumption. As a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/34G09G3/20
CPCG09G3/3406G09G2360/16G09G3/2007G09G2320/0673G09G2320/0646G09G3/2092G09G2320/0271G09G3/3611G02F1/133H04N9/69
Inventor 能势崇降旗弘史
Owner SYNAPTICS JAPAN GK
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