Control method for optimizing dynamic backlight of local area of liquid crystal display equipment

Abstract

The invention discloses a control method for optimizing dynamic backlight of a local area of liquid crystal display equipment. The liquid crystal display effect is optimized by means of dynamic backlight modulation and image content correction. The control method comprises the steps that 1, the image gray level distribution under each subarea is detected under a fixed sub block, and brightness estimations of all subareas are obtained according to detection results; 2, an interframe histogram difference is detected, and weighted summation is performed to obtain image change estimations, and backlight correction parameters are obtained according to estimation results; 3, initial backlight is dynamically corrected through the backlight correction parameters, and backlight is controlled to be changed; and 4, image content is dynamically corrected according to the obtained backlight. By means of dynamically correcting backlight, the image signal to noise ratio can be ensured, meanwhile, energy consumption of the display equipment is lowered, the image dynamic contrast is increased, and dynamic backlight uniformity optimization is achieved, so that the purpose of optimizing the subjective display effect is achieved.

Description

technical field [0001] The invention relates to a control method for optimizing the dynamic backlight of a local area of ​​a liquid crystal display device based on probability statistics, and belongs to the field of display device algorithms. Background technique [0002] With the rapid development of display technology, people's requirements for display devices are also constantly increasing. Display devices with high color gamut, high contrast, low power consumption, and large size are gradually favored by more and more people. In addition, the development of mobile devices also puts forward more new requirements for display functions. [0003] The traditional liquid crystal display cannot fully reproduce the image content in the dark field, due to the incomplete closing defect of the liquid crystal molecules, the local dynamic backlight technology is used to overcome the defects of the liquid crystal material itself. However, for the existing dynamic backlight liquid cr...

AI Technical Summary

Problems solved by technology

[0003] The traditional liquid crystal display cannot fully reproduce the image content in the dark field, due to the incomplete closing defect of the liquid crystal molecules, the local dynamic backlight technology is used to overcome the defects of the liquid crystal material itself

However, for existing dynamic backlight liquid crystal display devices, the traditional local dynamic backlight algorithm has the following defects: (1) For the situation of high image contrast, due to the incomplete closing of the liquid crystal, the backlight of the brighter partition causes the outgoing light to be too high, As a result, the backlight mutation of moving images is caused; (2) due to the overly conservative backlight estimation, the backlight reduction for most images is insufficient, and the energy saving is limited

For the liquid crystal display of mobile devices, due to the limitation of cost, driving circuit area and other conditions, only dynamic backlight with fewer partitions can be used, which will lead to more serious backlight mutation and seriously affect the display effect

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