A dimming circuit of a backlight module, a dimming method thereof, and a display device
A technology of backlight module and dimming circuit, applied in static indicators, instruments, etc., can solve the problems of brightness jump, affecting the quality of backlight adjustment, and low efficiency of backlight brightness adjustment.
Active Publication Date: 2022-04-26
BOE TECH GRP CO LTD +1
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Problems solved by technology
[0003] At present, the PWM signal is often collected through the rising edge time and falling edge time of the waveform. On the one hand, because the rising edge time and falling edge time of the PWM signal corresponding to the waveform are usually only microseconds, especially the falling edge time is too short, it is easy to collect errors. , affecting the quality of backlight adjustment
On the other hand, it is impossible to distinguish signals with too high or too low duty cycle, such as 0% and 100%, and it is easy to cause brightness jumps
[0004] It can be seen that the adjustment efficiency of the existing backlight brightness is low, thereby reducing the display quality
Method used
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[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. And in the case of no conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0050] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention be...
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The present invention provides a dimming circuit of a backlight module, a dimming method thereof, and a display device. The clock generator included in the dimming circuit is used to copy the target PWM signal output by the driver board according to the current display screen into the first PWM signal. , the second PWM signal and the third PWM signal, the first PWM signal is directly input to the microcontroller, the second PWM signal is input to the microcontroller through the second sub-channel PWM signal modulated by the first gate circuit, The third PWM signal is input to the microcontroller through the third sub-channel PWM signal modulated by the second gate circuit; the microcontroller is used to: determine the level state of the target PWM signal according to the first PWM signal, The signal and the third sub-channel PWM signal determine the edge transition time of the target PWM signal, determine the duty cycle of the target PWM signal according to the level state and the edge transition time, and adjust the brightness output to the backlight according to the duty cycle.
Description
technical field [0001] The invention relates to the field of display technology, in particular to a dimming circuit of a backlight module, a dimming method thereof and a display device. Background technique [0002] Existing backlight control often adopts pulse width modulation (Pulse Width Modulation, PWM) dimming to adjust the brightness of the backlight. Specifically, a PWM signal is generated by the whole machine driver board or a system-on-chip (System on Chip, SOC), and the PWM signal is directly used signal to adjust the brightness of the backlight. [0003] At present, the PWM signal is often collected through the rising edge time and falling edge time of the waveform. On the one hand, because the rising edge time and falling edge time of the PWM signal corresponding to the waveform are usually only microseconds, especially the falling edge time is too short, it is easy to collect errors. , affecting the quality of backlight adjustment. On the other hand, it is imp...
Claims
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IPC IPC(8): G09G3/34
CPCG09G3/3406G09G3/3413
Inventor 李鹏
Owner BOE TECH GRP CO LTD