Backlight brightness control method, device and liquid crystal display device
A backlight brightness and backlight technology, applied in static indicators, instruments, etc., can solve the problem of limited dynamic range of backlight, achieve good image area contrast and display dynamic range, increase dynamic range, and increase peak current Effect
Active Publication Date: 2018-08-07
HISENSE VISUAL TECH CO LTD
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[0004] However, the existing multi-zone dynamic backlight modulation technology is realized by dynamically adjusting the PWM duty cycle under the premise of setting a fixed peak current of the backlight source, because the PWM duty cycle can only be in the range of 0 to 100%. Internal adjustment, that is, the change range of the brightness of the backlight can only be 0 to 100% of the corresponding brightness under the current fixed peak current. It can be seen that the dynamic range of the brightness adjustment of the backlight is limited
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0032] In order to improve the dynamic contrast ratio and image quality of liquid crystal display devices, multi-zone dynamic backlight modulation technology is usually adopted. The entire backlight matrix is divided into multiple backlight zones in the row and column directions. The brightness is driven and controlled independently. It should b...
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The invention provides a backlight brightness control method and device and a liquid crystal display device. The method comprises the following steps: determining basic backlight data and expansion backlight data of a backlight in each backlight subregion corresponding to a subregion image according to the gray scale data of the subregion image, wherein the basic backlight data is used for indicating the duty ratio of pulse width modulation (PWM) of the backlight in the backlight subregion, and the expansion backlight data is used for indicating the peak current gain coefficient of the backlight in the backlight subregion; and adjusting the duty ratio of the PWM of the backlight in the backlight subregion according to the basic backlight data, and adjusting the peak current of the backlight in the backlight subregion according to the expansion backlight data to control the brightness of the backlight in the backlight subregion. Therefore, dynamic change range of adjustment of the brightness of the backlight is improved, and better image region contrast is realized and the dynamic range is displayed better.
Description
technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a method and device for controlling brightness of a backlight source and a liquid crystal display device. Background technique [0002] In existing liquid crystal display devices, multi-zone dynamic backlight modulation technology is usually used to control the brightness of the backlight source, so as to improve image quality effects such as display contrast. [0003] figure 1 It is a schematic diagram of the backlight partition in the multi-partition dynamic backlight modulation technology, such as figure 1 As shown, the entire backlight matrix includes M partitions in the A direction and N partitions in the B direction. Assuming M=16, N=9 in the figure, there are M*N=144 backlight partitions, and the backlight in each backlight partition Brightness can be individually driven and controlled. Correspondingly, each frame of the global image is divided into multi...
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IPC IPC(8): G09G3/34
CPCG09G3/3406
Inventor 张玉欣
Owner HISENSE VISUAL TECH CO LTD