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A backlight adjustment method and a backlight driving circuit

A backlight drive circuit and backlight adjustment technology, applied in static indicators, instruments, etc., can solve the problems of increasing the complexity of the backlight circuit, and achieve the effect of solving the problem of flickering screen.

Active Publication Date: 2019-09-24
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that an additional adjustable DC voltage output circuit needs to be added, thus increasing the complexity of the entire backlight circuit

Method used

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  • A backlight adjustment method and a backlight driving circuit
  • A backlight adjustment method and a backlight driving circuit
  • A backlight adjustment method and a backlight driving circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] image 3 The flow diagram of a backlight adjustment method provided in Embodiment 1 of the present invention is applicable to the situation where the screen of the display device changes from bright screen to off screen, and the method can be executed by a backlight driving circuit, wherein the backlight driving circuit can be controlled by software and / or implemented by hardware, and generally integrated in a display device.

[0022] like figure 1 As shown, a backlight adjustment method provided by Embodiment 1 of the present invention includes the following operations:

[0023] S101. After receiving the trigger-generated off-screen instruction, the main control module determines the duty cycle of the PWM signal currently received by the backlight control module.

[0024] Generally, the display device can be an electronic device with a backlight, and the backlight can be an LED light, and the state transition of the display device from on-screen to off-screen can be...

Embodiment 2

[0033] Figure 4 It is a schematic flowchart of a backlight adjustment method provided by Embodiment 2 of the present invention. This embodiment is optimized on the basis of the above-mentioned embodiments. In this embodiment, the main control module determines that the PWM signal currently received by the backlight adjustment module takes up The specific optimization of the duty ratio is as follows: the determination unit of the main control module determines the duty ratio of the PWM signal currently received by the backlight control module according to the PWM signal currently generated by the main control module.

[0034] On the basis of the above embodiments, the method for adjusting the backlight further includes: the determination unit of the main control module determines whether the duty cycle of the PWM signal is higher than the set duty cycle threshold.

[0035]Further, the main control module increases the duty cycle of the PWM signal input to the backlight control...

Embodiment 3

[0055] Figure 5a It is a structural block diagram of a backlight driving circuit provided by Embodiment 3 of the present invention. Applicable to the situation where the screen of the display device changes from bright screen to off screen, the backlight driving circuit can be realized by software and / or hardware, and is generally integrated in the display device. like Figure 5a As shown, the backlight driving circuit includes: an input filter 51 , an energy storage inductor 52 , an output filter 53 and a backlight 54 , and also includes a main control module 55 and a backlight regulation module 56 .

[0056] Wherein, the main control module 55 is connected with the backlight control module 56, and is used for determining and judging the duty cycle of the PWM signal currently received by the backlight control module 56 after receiving the off-screen command generated by the trigger, and generating a PWM signal or enabling Signal.

[0057] The backlight control module 56 i...

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PUM

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Abstract

The embodiment of the invention discloses a backlight adjusting method and a backlight drive circuit. The method comprises the following steps: after receiving a command of turning-off a screen generated through triggering, a main control module determines the duty ratio of a pulse width modulation PWM signal currently received by the backlight control module; if the duty ratio of the PWM signal is not higher than a set duty ratio, the main control module increases the duty ratio of the PWM signal inputted to the backlight control module and returns to perform duty cycle determination operation; otherwise, the main control module inputs a required enable signal for closing the backlight to the backlight control module Through utilization of the method, gradual adjustment of the backlight brightness of the backlight in turn-off of the screen is realized, thus better solving the problem of splash screens in turn-off of the screen.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of liquid crystal display, and in particular, to a backlight adjustment method and a backlight driving circuit. Background technique [0002] Currently, for a display device, when the display device is switched from a bright screen to an off screen state, the backlight is usually directly turned off through the backlight enable in the backlight drive circuit, causing the screen to go out instantly from the bright state. The visual residual effect can easily give users the illusion of a flickering screen, especially when the screen brightness is high, the flickering problem is more obvious. In view of the above problems, technicians have improved the backlight driving circuit, thereby controlling and adjusting the brightness of a light emitting diode (Light Emitting Diode, LED) serving as a backlight source. At present, the improvement of the backlight driving circuit is generally imple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34
Inventor 徐章龙肖冬毅叶声明
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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