Method for adjusting liquid crystal display device backlight lightness and contrast

Abstract

The invention provides a method for adjusting the brightness of the backlight and the contrast of an LCD. The method comprises the steps as follows: 1. calculating the brightness distribution ratio of the pixels of an image; 2. calculating the parameters of the contrast coefficient and the brightness distribution uniformity according to the brightness distribution ratio, and calculating the backlight coefficient according to the contrast coefficient and the brightness distribution uniformity; and 3. controlling the backlight of the LCD display according to the backlight control ratio and calculating the contrast of images according to the contrast ratio. By adopting the technical proposal provided by the invention, a backlight strip lamp does not keep the constant brightness; instead, the brightness of the strip lamp varies dynamically with the brightness of the image displayed. The power consumption of the strip lamp is reduced more efficiently, and the service life of the strip lamp is improved. In addition, the image contrast is not a constant which is adjusted artificially; instead, the image contrast can be adjusted dynamically with the brightness of the images so as to show the details of the images better, and improve the hierarchy of the images.

Description

technical field [0001] The invention belongs to the field of display technology, in particular to liquid crystal display technology. Background technique [0002] The backlight of the existing liquid crystal display basically works under a certain fixed voltage and current. Regardless of whether the image is bright or dark, the luminous intensity of the backlight tube will not change, so its power consumption is constant. When the picture is dark, The high luminous intensity of the backlight tube undoubtedly increases the waste of electric energy and shortens the service life of the lamp tube. At the same time, the image contrast is also determined by the physical characteristics of the LCD screen and cannot be adjusted dynamically. [0003] In order to solve the above problems, some methods for dynamically adjusting the backlight brightness of liquid crystal display devices are provided in the prior art, such as a light sensor correction method for automatic brightness cont...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for adjusting the brightness and contrast of the backlight of a liquid crystal disp

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