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Brightness adjusting method of LCD TV backlight

A technology of backlight brightness and LCD TV, which is applied in the direction of TV, color TV, color TV parts, etc. It can solve problems such as difficult backlight adjustment and inability to correctly sense background brightness, so as to improve comfort, reduce power consumption, reduce The effect of small picture peak brightness

Inactive Publication Date: 2008-01-09
SHENZHEN TCL IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the photosensitive characteristics of photoresistors, etc., there are situations where the background brightness cannot be sensed correctly, and it is difficult to adjust the backlight correctly

Method used

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  • Brightness adjusting method of LCD TV backlight
  • Brightness adjusting method of LCD TV backlight

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Please refer to Figure 1, which is the APL-peak luminance curve of a certain model of CRT TV. It can be seen that the peak brightness of the CRT TV will decrease with the increase of the average picture level. Therefore, by dynamically controlling the backlight and correcting the image signal amplitude on the LCD TV to simulate the above characteristics of the CRT TV, the purpose of enhancing the picture contrast, improving viewing comfort, and reducing power consumption can be achieved.

[0014] Please refer to Figure 2 and Figure 3 together. First, the peak brightness of the LCD TV is converted into relative peak brightness, and its APL-relative peak brightness curve can be simulated. The curve in Fig. 2 can be realized by using the fitting function, and can also be realized by look-up table and interpolation method. FIG. 3 is an APL-relative peak luminance ...

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Abstract

The method comprises: creating a peak brightness table relating to the mean image level; reading out the RGB data of one frame of video signal; calculating the mean image level of said one frame of image; according to the mean image level, searching the relative peak brightness from the peak brightness table relating to the mean image level; according to the relative peak brightness, calculating the duty ratio; inputting the duty ratio into the pulse width modulator located in the backlight controlling unit of the LCD TV; adjusting the backlight brightness of the LCD TV; making the inversed control for the image to increase the signal brightness. The invention increases the contrast of TV images.

Description

【Technical field】 [0001] The invention relates to a method for adjusting the brightness of the backlight of a liquid crystal television, in particular to a method for automatically adjusting the brightness of the backlight of the liquid crystal television according to the brightness of the television picture. 【Background technique】 [0002] Recently, with the development of display technology, liquid crystal displays (LCDs) have become more and more widely used. Compared with traditional CRT (cathode ray tube) TVs, LCD TVs (LCD-TVs) have the advantages of light weight, small size, environmental protection and energy saving, etc., and have gradually been favored by consumers. [0003] When playing a TV picture, the peak brightness of a CRT TV will decrease as the average picture level (Average Picture Level, APL) increases. That is, when a large-area high-brightness picture appears, the peak brightness of the entire TV picture will also decrease accordingly, which will not c...

Claims

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Application Information

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IPC IPC(8): H04N5/57
Inventor 冯万良董宁斌
Owner SHENZHEN TCL IND RES INST
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