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Liquid crystal display device and method for processing digital image signal

A liquid crystal display device and digital image technology, applied in static indicators, instruments, etc., can solve the problems of lower display contrast, lower backlight utilization, and less than 0 transmittance

Active Publication Date: 2014-01-01
日照德艺智能仪表有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A liquid crystal display device with LED backlight has appeared, in which the brightness of the backlight is fixed and cannot be adjusted according to changes in the content of the liquid crystal display
And even when the gray level of liquid crystal is 0, its transmittance cannot reach 0.
Therefore, there is always a part of light that will pass through the liquid crystal, that is, light leakage occurs, resulting in the "dark" part of the liquid crystal display screen not being "dark" enough, which reduces the display contrast; at the same time, most of the light from the backlight is blocked by the liquid crystal, reducing the backlight utilization, resulting in additional power consumption

Method used

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

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Embodiment 1

[0031] This embodiment provides a liquid crystal display device, including a decoding module 99, a timing control module 100, a liquid crystal driving module 104, a backlight driving module 108, a liquid crystal panel 105, and an LED backlight module 109. The decoding module 99, timing control module 100, liquid crystal The connections and functions of the driving module 104 , the backlight driving module 108 , the liquid crystal panel 105 and the LED backlight module 109 belong to the prior art, and will not be repeated here. The dynamic backlight control module 10 will be mainly described below.

[0032] Dynamic backlight control module 10 is connected with decoding module 99, certainly in order to reduce cost, dynamic backlight control module 10 also can be integrated in decoding module 99, as figure 2 As shown in the dotted line box, that is, the dynamic backlight control module 10 and the decoding module 99 are integrally arranged.

[0033] The decoding module 99 is used...

Embodiment 2

[0037] This embodiment provides a liquid crystal display device. On the basis of Embodiment 1, this embodiment optimizes the design of the dynamic backlight control module 10. The dynamic backlight control module 10 includes: an image signal receiving module, an image buffer module, and an image analysis module. module, a backlight brightness calculation module, a backlight distribution calculation module, and a liquid crystal gray scale adjustment module. Such as image 3 As shown, the liquid crystal display device includes: an image signal receiving module 101, an image cache module 102, a liquid crystal grayscale adjustment module 103, a liquid crystal driving module 104, a liquid crystal panel 105, an image analysis module 106, a backlight brightness calculation module 107, and a backlight driving module 108 , LED backlight module 109 , backlight distribution calculation module 110 .

[0038] The image signal receiving module 101 is respectively connected with the decodin...

Embodiment 3

[0045] On the basis of Embodiment 2, preferably, this embodiment further sets the average value unit 1061 and the sample variance unit 1062 connected in sequence in the image analysis module, such as Figure 4 As shown, the average value unit 1061 is used to receive the digital image signal, count the original gray values ​​of all pixels in the digital image signal by region, and send it to the sample variance unit; and, the average value unit 1061 also According to the original gray values ​​of all pixels, calculate the average gray value Ai of all pixels in each area, and output the average gray value Ai to the backlight brightness calculation module, and the sample variance unit 1062 calculates the original gray value Ai in each area. Calculate the sample variance Vi of the grayscale value, output the sample variance Vi to the backlight brightness calculation module 107, and calculate the initial value of the backlight brightness by the backlight brightness calculation modul...

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Abstract

The invention discloses a liquid crystal display device comprising a decoding module, a time sequence control module, a liquid crystal drive module, a backlight drive module, a liquid crystal displaypanel and an LED backlight module. The liquid crystal display device is characterized by further comprising a dynamic backlight control module. The invention further discloses a method for processinga digital image signal of a liquid crystal display adjusting device. The invention adopts a method for independently controlling backlight subareas to be capable of reducing or even closing the backlight at parts with darker pictures and really darkening the backlight, so as to improve the picture contrast ratio and change the backlight brightness according to the change of the pictures by independently controlling the backlight subareas, thus reducing power consumption.

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 size 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 is increasing year by year. [0003] Since the LCD is a passive display and does not em...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
Inventor 杨雷邵寅亮李鹏
Owner 日照德艺智能仪表有限公司
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