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Image processing method in LCD

A liquid crystal display and image processing technology, applied in static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of uneven contrast, backlight brightness adjustment, and the adjustment of image data backlight brightness are not related to each other, so as to improve the Contrast, reduce power usage, increase the effect of color gradation

Active Publication Date: 2008-04-16
AU OPTRONICS CORP
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Problems solved by technology

[0003] However, although adjusting the input image data can achieve the purpose of improving the image contrast, in the existing practice, the required backlight brightness is adjusted after the input image data is changed; in other words, the image data processing and the backlight brightness The adjustments are independent of each other
In this way, the brightness of the backlight cannot be adjusted relative to the image data, and the contrast of some parts of the entire image may be uneven, or the user may feel that some parts are particularly special when viewing the image. Bright or very dark situations occur

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Embodiment Construction

[0016] FIG. 1 is a schematic block diagram illustrating an image processing system in a liquid crystal display according to an embodiment of the present invention. The image processing system includes a backlight parameter generating circuit 102 , a pulse width modulation (PWM) signal generating circuit 104 and an image grayscale conversion circuit 106 . The backlight parameter generation circuit 102 can receive input image data, and generate a backlight index according to the received input image data, and then transmit the backlight index to the pulse width modulation signal generation circuit 104 and the image gray scale conversion circuit 106 respectively. middle. The PWM signal generating circuit 104 generates a corresponding PWM signal according to the received backlight parameters, so as to control the brightness of the backlight. The image grayscale conversion circuit 106 converts the input image data into output image data according to the received backlight paramete...

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Abstract

The invention relates to a method for processing images of a liquid crystal display (LCD), comprising the following steps that: backlighting parameters are obtained according to image datum; a backlighting source is adjusted against the backlighting parameters; a gray reference value is obtained against the adjusted backlighting source, wherein the gray reference value between a first gray boundary value and a second boundary value; when the gray value of the image datum is between the gray reference value and the first gray boundary value, the gray value of the image data is converted into a corresponding output gray value against the backlighting parameters; when the gray value of the image data is between the gray reference value and the second gray boundary value, the gray value of the image data is converted into a corresponding output gray value against a linear relation. The invention can improve contrast degree of the image and increase the color levels displayed by the image so as to highlight the image.

Description

technical field [0001] The present invention relates to an image processing method, and in particular to an image processing method of a liquid crystal display. Background technique [0002] In general displays, the technology for improving image contrast is mainly to process the input image data, and determine the original input image data by analyzing various characteristics of the entire image data on the image histogram. Change the amount, and adjust the required backlight brightness, so that the difference between adjacent gray scale values ​​becomes larger, thereby improving the contrast of the image. [0003] However, although adjusting the input image data can achieve the purpose of improving the image contrast, in the existing practice, the required backlight brightness is adjusted after the input image data is changed; in other words, the image data processing and the backlight brightness The adjustments are independent of each other. In this way, the brightness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/34G09G3/20G09G5/02
Inventor 简民峰周明忠谢曜任何宇玺
Owner AU OPTRONICS CORP
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