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Liquid crystal display (LCD) device and image signal processing method

A technology for liquid crystal display device and image signal processing, applied in the field of liquid crystal display device and image signal processing, can solve the problems of low backlight brightness, low backlight brightness of monochrome images, low power consumption saving, etc., so as to avoid excessive backlight brightness. Low, good display effect

Active Publication Date: 2010-03-17
SICHUAN ROSTAR ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional LCD display devices have two significant disadvantages: 1. High power consumption
In electronic products using LCD, the energy consumption of LCD accounts for 30% to 70% of the total energy consumption, and the backlight of LCD is the part that consumes the most power. Traditional LCDs generally use CCFL backlight. During the entire working period, CCFL The backlight is always working at full load, so the power consumption is very large
Second, lack of contrast
One way to determine the dynamic backlight is to use the maximum brightness of the input image, but this method of using the maximum has the problem of small power saving and too sensitive to noise
Another common method to determine the dynamic backlight is to use the average brightness of the input image, but this method has the problem that the backlight brightness is too low and the image details are lost when dealing with darker images.
[0005] In the US patent US20080291153, the Hong Kong Institute of Applied Science and Technology proposed a method to calculate the brightness average and variance of the image by using the histogram of the image, and then obtain the backlight adjustment value from the brightness average and variance, but it has the problem of excessive brightness of the monochrome image backlight. Low problem, for example, the backlight brightness of the blue image calculated according to this method is only 0.4, and the image is too dark when displayed on the LCD

Method used

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  • Liquid crystal display (LCD) device and image signal processing method
  • Liquid crystal display (LCD) device and image signal processing method
  • Liquid crystal display (LCD) device and image signal processing method

Examples

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Embodiment 1

[0033] Such as figure 1 and figure 2 As shown, this embodiment provides a liquid crystal display device, including a decoding module 90, a dynamic backlight control module 100, a timing control module (timing controller, also known as a T-CON board) 110, a liquid crystal driving module 120, a liquid crystal panel 130, a backlight The drive module 140, and the LED backlight module 150, the connection relationship and functions of the above-mentioned decoding module 90, timing control module 110, liquid crystal drive module 120, backlight drive module 140, liquid crystal panel 130 and LED backlight module 150 belong to the prior art, such as figure 1 shown, and will not be repeated here. The following description focuses on the dynamic backlight control module 100 .

[0034] Such as figure 2 As shown, the dynamic backlight control module 100 is connected to the decoding module 90, of course, in order to reduce the cost, the dynamic backlight control module 100 can also be i...

Embodiment 2

[0037] On the basis of the above examples, this embodiment provides a liquid crystal display device, such as image 3 As shown, the dynamic backlight control module 100 includes an image signal receiving unit 101 , a search unit 102 , a statistics unit 103 , a calculation unit 104 , and a backlight control unit 106 connected in sequence.

[0038] Wherein, the image signal receiving unit 101 is connected with the search unit 102 for receiving R, G, B grayscale signals in one frame of video image signal and sending them to the search unit 102 . The search unit 102 is connected to the image signal receiving unit 101 and the statistical unit 103 respectively, converts the R, G, B grayscale signals into signals R', G', B' after gamma correction, and converts the signals R', G', B' is sent to the statistical unit 103.

[0039] The statistics unit 103 is respectively connected with the search unit 102 and the calculation unit 104, and is used to calculate the average value and stand...

Embodiment 3

[0048] This embodiment provides an image signal processing method, which is applied to any of the above-mentioned liquid crystal display devices, which includes the following steps.

[0049] A1. Receive image signals R, G, B; for example, step A1 further includes the following step A11. Buffering the image signals.

[0050] A2. Perform gamma correction on the image signals R, G, and B respectively, and convert them into signals R', G', and B';

[0051] A3. Calculate the average value and standard deviation of R', G', and B' respectively; for example, calculate the average value and standard deviation of R', G', and B' by counting the histograms of R', G', and B' respectively standard deviation.

[0052] A4. Calculate the backlight adjustment value T according to each average value and each standard deviation.

[0053] For example, step A4 specifically performs the following steps:

[0054] A41. Calculate the maximum value X of the linear combination of the average value and...

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Abstract

The invention discloses a liquid crystal display (LCD) device and an image signal processing method applied to the LCD device. The LCD device comprises a decoding module, a dynamic backlight control module, a time sequence control module, a liquid crystal driving module, an LCD panel, a backlight driving module and an LED backlight module, wherein the dynamic backlight control module is connectedwith the decoding module and is used for receiving an image RGB grey scale signal, carrying out gamma correction on the RGB grey scale signal and statistics on the average value and the standard deviation, calculating to obtain the backlight adjusted value, calculating a backlight brightness signal according to the reference brightness value which is preset or input by a user, and outputting the backlight brightness signal to the backlight driving module to drive the LED backlight module to lighten the LCD panel. The invention also discloses the corresponding image signal processing method. The device and the method can effectively reduce the power consumption, increases the contrast, avoids the situation of ultra-low backlight brightness when the image is monochrome image with less standard deviation, and improves the display effect.

Description

technical field [0001] The present invention relates to the field of liquid crystal display, and in particular, to a liquid crystal display device and an image signal processing method applied to the liquid crystal display device. Background technique [0002] Liquid crystal display (LCD) is gradually used in various fields of production and life due to its advantages of small size and light weight. Since the LCD is a passive display, it does not emit light itself, so the LCD needs a backlight unit as its light source, and displays images by the transmitted light. [0003] Traditional LCD display devices have two significant disadvantages: 1. High power consumption. In electronic products using LCD, the energy consumption of LCD accounts for 30% to 70% of the total energy consumption, and the backlight of LCD is the part that consumes the most power. Traditional LCDs generally use CCFL backlight. During the entire working period, CCFL The backlight always works at full loa...

Claims

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Application Information

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IPC IPC(8): G09G3/36
Inventor 杨雷邵寅亮翟波澜
Owner SICHUAN ROSTAR ELECTRONICS TECH
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