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

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

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

[0033] Such as figure 1 with 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 drive module 120, a liquid crystal panel 130, and a backlight The connection relationship and functions of the driving module 140, and the LED backlight module 150, the decoding module 90, the timing control module 110, the liquid crystal driving module 120, the backlight driving module 140, the liquid crystal panel 130, and the LED backlight module 150 belong to the prior art, such as figure 1 As shown, I will not repeat them here. The following 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 costs, the dynamic backlight control module 100 c...

Example Embodiment

[0036] Example 2

[0037] On the basis of the above example, 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 to the searching unit 102, and is configured to receive R, G, and B grayscale signals in one frame of video signal, and send them to the searching unit 102. The search unit 102 is respectively connected to the image signal receiving unit 101 and the statistics unit 103, and converts the R, G, B grayscale signals into signals R', G', B'after γ correction, and converts the signals R', G', B'is sent to the statistics unit 103.

[0039] The statistical unit 103 is respectively connected with the search unit 102 and the calculation unit 104, and is used to calculate the aver...

Example Embodiment

[0047] Example 3

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

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

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

[0051] A3. Calculate the average and standard deviation of R', G', and B'separately; for example, calculate the average 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 standard devia...

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PUM

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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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