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Method for enhancing contrast

A technology of contrast and relative brightness, which is applied in the field of contrast enhancement of liquid crystal display devices, and can solve problems such as lowering the brightness of the backlight module, visual fatigue, and dark overall images

Active Publication Date: 2010-01-13
HANNSTAR DISPLAY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is likely to cause flickering and flickering phenomena on the screen, making it uncomfortable for human eyes to watch, and it is easy to cause visual fatigue.
At the same time, when the brightness of the backlight module is adjusted quickly and frequently, the service life of the backlight module will be significantly reduced
On the other hand, when the screen is dark, because the brightness of the backlight module is lowered, although the contrast can be improved, the overall screen will become darker.
[0004] In order to overcome the above problems, the present invention proposes a brand-new concept and solution, which can effectively solve the problems of screen flickering and uncomfortable viewing, and at the same time improve the contrast of the liquid crystal display

Method used

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Examples

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no. 1 example

[0037] figure 1 It is a schematic diagram of the brightness adjustment process of the backlight module according to the first embodiment of the present invention. Generally speaking, LCD TVs (or LCD monitors) display about 60 images per second, so a new image will be displayed every 1 / 60 second. refer to figure 1 , the horizontal axis is the time axis, and its top is the ratio of the total brightness value of the picture at each time point relative to the maximum brightness value of the LCD TV as time progresses, which is called the instant brightness ratio in the present invention. The total brightness value of each picture can be calculated from the input picture signal, which may come from DVD player, Blu-ray disc player, coaxial cable of cable TV, hard disk or memory card with electronic image files, or even connected to the Internet fiber optics, etc.

[0038] The maximum brightness value can be calculated by multiplying the maximum gray value by the total pixels (incl...

no. 2 example

[0047] image 3 It is a schematic diagram of the brightness adjustment process of the backlight module according to the second embodiment of the present invention. The instant brightness ratio at each time point of this embodiment is exactly the same as that of the first embodiment, that is, the same picture signal is input, so as to facilitate the comparison of the adjustment method of the brightness of the backlight module between this embodiment and the first embodiment. In this implementation, the concept of buffer time is introduced to further avoid starting the brightness adjustment function of the backlight module too frequently, and the details are as follows.

[0048] refer to image 3 , when the time point starts from zero, the instant brightness ratio of the screen is 100%, and as time goes by, the instant brightness ratio begins to decrease and reaches T 20 At the time point, when the instant brightness ratio drops to the preset ratio of 10%, the timing function ...

no. 3 example

[0055] refer to Figure 4 , which is a schematic diagram of a display device according to a third embodiment of the present invention. This embodiment proposes a display device 1 , which has the effect of improving contrast. The display device 1 may be a liquid crystal display (such as a liquid crystal television) or other display devices that require a backlight module. The display device 1 (such as a liquid crystal television) includes a receiving element 10 , a computing element 20 , a control element 30 and a backlight module 40 .

[0056] The receiving element 10 can be used to receive picture signals, which may come from DVD players, Blu-ray disc players, coaxial cables of cable television, hard disks or memory cards or tapes with electronic files of images, or even connected to the Internet (Internet) fiber optics, etc.

[0057] Calculation element 20 can be an integrated circuit chip, can be used for calculating the luminance value of each picture of the picture sig...

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Abstract

The invention provides a method for enhancing the contrast, which is suitable for a display device, wherein the display device comprises a back light module and has a maximum brightness value. The method for enhancing the contrast comprises the following steps: receiving picture signals continuously in each unit time; calculating the proportion of a picture brightness value corresponding to each picture signal and the maximum brightness value continuously and setting the proportion as instantaneous relative brightness; setting a first proportion, first adjusting time, a second proportion and second adjusting time; adjusting and lowering the brightness of the back light module to minimum brightness gradually in the first adjusting time when the instantaneous relative brightness is smaller than the first proportion; and adjusting and increasing the brightness of the back light module to maximum brightness gradually in the second adjusting time when the instantaneous relative brightness is greater than the second proportion.

Description

technical field [0001] The invention relates to a contrast enhancement method applied to a display device, in particular to a contrast enhancement method applied to a liquid crystal display device. Background technique [0002] In recent years, the technology of liquid crystal displays has advanced by leaps and bounds, and the manufacturing cost has also been continuously reduced, so that liquid crystal displays (LCDs) have almost completely replaced traditional cathode ray tubes (CRTs) in the monitor market. And with the advancement of liquid crystal display technology, the market for LCD TVs is growing rapidly, and the performance requirements for LCD TVs are also getting higher and higher. Compared with traditional CRT TVs, LCD TVs have many advantages, such as ultra-thin volume, larger picture, and greatly improved resolution. However, LCD TVs also have their weaknesses. For example, the contrast ratio is not as good as that of traditional CRT TVs. This is because the b...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G3/36
Inventor 黄文成陈录豪蔡松有简张城
Owner HANNSTAR DISPLAY CORPORATION
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