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Liquid crystal display device and processing method of digital image signal

A liquid crystal display device, digital image technology, applied in identification devices, static indicators, instruments, etc., can solve problems such as unfavorable implementation, low backlight brightness, loss of image details, etc., to avoid image contrast reduction, expand image range, and easily The effect of hardware implementation

Active Publication Date: 2010-09-08
广州格芬电子科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that for darker images, the backlight brightness is too low, and the details of the image are lost
[0010] IMF algorithm: This algorithm obtains the backlight adjustment value by calculating the IMF curve of the gray histogram of the image. The disadvantage is that the calculation is complicated, which is not conducive to implementation
[0011] The algorithm proposed in the patent US20080291153 has the following problems: 1. This algorithm has the problem that the backlight is too low when processing images with a large average brightness and small variance, such as monochrome images
For example, for a pure white image, according to the algorithm of this patent, the backlight is only 0.7; 2. The low-gray part of the image has too much liquid crystal compensation, resulting in a more obvious problem of graying in dark areas of the image when displaying a darker image

Method used

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  • Liquid crystal display device and processing method of digital image signal
  • Liquid crystal display device and processing method of digital image signal

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Experimental program
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Embodiment 1

[0066] This embodiment provides a liquid crystal display device, such as figure 1 As shown, it includes: a liquid crystal drive module 15, a backlight drive module 16, a liquid crystal panel 18 and an LED backlight 17, an image signal receiving module 10, an image cache module 11, an image analysis module 12, a backlight brightness calculation module 13, and a liquid crystal gray scale calculation module 15. Image signal receiving module 10 is connected with image cache module 11, image analysis module 12 respectively, is used to provide digital image signal to image cache module 11 and image analysis module 12; Image cache module 11 is connected with liquid crystal gray scale calculation module 14, Used to receive and buffer digital image signals for use by the liquid crystal grayscale calculation module 14 to adjust the liquid crystal grayscale; the image analysis module 12 is connected to the backlight brightness calculation module 13 for receiving digital image signals and...

Embodiment 2

[0068] On the basis of Example 1, such as figure 2 As shown, preferably, in this embodiment, a brightness signal calculation unit 121, an average value calculation unit 124, and a maximum value calculation unit 123 are set in the image analysis module, and the brightness signal calculation unit 121 is used to receive the digital image signal, Calculate the image brightness signal according to the formula Y=0.299×R+0.587×G+0.114×B, wherein Y is the image brightness signal, R, G, and B are the original grayscale data of the digital image signal, and the average value calculation unit 124 is connected with the luminance signal calculation unit 121 for calculating the average value Yavg of the image luminance signal, and the maximum value calculation unit 123 is connected with the luminance signal calculation unit 121 for calculating the value of the image luminance signal Maximum value Ymax.

Embodiment 3

[0070] On the basis of Example 1, such as image 3 As shown, preferably, the present embodiment further sets a histogram statistical unit 121 in the image analysis module 12, and its connection relationship is changed to: the luminance signal calculation unit 121 and the histogram statistic unit 122 are connected in sequence, and the luminance signal calculation unit 121 It is used to receive the digital image signal, calculate the image brightness signal according to the formula Y=0.299×R+0.587×G+0.114×B, where Y is the image brightness signal, R, G, B are the original grayscale data of the digital image signal, the histogram Figure statistics unit 122 is used for carrying out histogram statistics to image luminance signal Y, and histogram statistics unit 122 is also connected with average value calculation unit 124 and maximum value calculation unit 123 respectively, and average value calculation unit 124 is used for according to histogram statistics unit 122 Calculate the a...

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Abstract

The invention discloses a liquid crystal display device, which comprises a liquid crystal driver module, a backlight driver module, a liquid crystal panel and LED backlight, and is characterized in that the liquid crystal device also comprises an image signal receiver module, an image cache module, an image analysis module, a backlight brightness calculation module and a liquid crystal grayscale calculation module. The invention also discloses a processing method of the digital image signal. The invention adopts an entire screen backlight adjustment method with a liquid crystal grayscale compensation method to enable the backlight brightness to change according to the contents of the images, so that the power consumption can be reduced, the display contrast can be improved, and the effect of the display pictures can be ensured.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a liquid crystal display device using LED backlight and a processing method for digital image signals. Background technique [0002] In the display, the cathode ray tube (CRT) once occupied the entire market, but due to its weight and volume limitations, it cannot meet the trend of miniaturization and light weight of electronic products. Currently, a small and compact display device is needed to replace the CRT. monitor. Later, with the research on display technology, liquid crystal display (LCD) can realize the display function of replacing CRT with its advantages of small size, light weight and low power consumption. With the in-depth research on LCD, it has been widely used in flat panel displays and personal computers and other display terminal equipment, and the market demand for LCD shows a growing trend year by year. [0003] Since the LCD is a passive display and d...

Claims

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Application Information

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IPC IPC(8): G09F9/35G09G3/36
Inventor 杨雷邵寅亮翟波澜
Owner 广州格芬电子科技有限公司
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