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Abnormal sound prevention backlight driving method based on low duty ratio input

A technology of backlight drive and low duty cycle, which is applied to instruments, static indicators, etc., can solve problems such as the inability to prevent, adjust the brightness of the backlight, abnormal noise, etc. The effect of light and noise prevention

Active Publication Date: 2019-10-18
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-duty-cycle input-based anti-abnormal backlight driving method. The technical solution provided by the present invention solves the problem that the existing vehicle-mounted backlight drive IC cannot be operated under the condition of low-duty-cycle input. To achieve the technical problem of preventing abnormal noise and adjusting the brightness of the backlight at the same time

Method used

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  • Abnormal sound prevention backlight driving method based on low duty ratio input
  • Abnormal sound prevention backlight driving method based on low duty ratio input
  • Abnormal sound prevention backlight driving method based on low duty ratio input

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Embodiment 1

[0027] In the design of the display screen, in order to avoid the PWM frequency resonating with the internal structure of the display screen and causing abnormal noise, the PWM frequency will be set at about 20KHz. When the PWM frequency increases, the conduction of the IC internal switch will The transit time is smaller. For this reason, on the basis of the low duty cycle input requirement, it is impossible to simultaneously prevent abnormal noise and adjust the brightness of the backlight.

[0028] Such as Figure 3-4 As shown, in order to solve the above problems, this embodiment proposes a low duty cycle input-based anti-abnormal backlight driving method, including the following steps:

[0029] S100. Obtain the minimum duty cycle Dmin of the PWM signal when the backlight driving IC is working.

[0030] Before outputting the PWM signal to the backlight driver IC, the minimum duty cycle required by the backlight driver IC must be obtained to ensure the normal startup of th...

Embodiment 2

[0043] This embodiment proposes an anti-abnormal backlight driving method based on a low duty cycle input, which also includes the following steps:

[0044] S100. Obtain the minimum duty ratio Dmin of the PWM signal when the backlight driving IC is working.

[0045] S200. Set the working duty ratio Dx of the PWM signal output to the backlight driving IC.

[0046] S300. Comparing the required duty ratio D required to be input by the automobile manufacturer and the working duty ratio Dx.

[0047] S400. If the required duty cycle D is not greater than the set working duty cycle Dx, adjust the PWM frequency output to the backlight driver IC to fL;

[0048] If the duty cycle D is required to be greater than the set duty cycle Dx, the PWM frequency output to the backlight driver IC is adjusted to fH.

[0049] As a further improvement of the technical solution, the difference between this embodiment and Embodiment 1 is that in order to ensure that the backlight driver IC responds t...

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Abstract

The invention relates to the technical field of backlight driving methods, in particular to an abnormal sound prevention backlight driving method based on low duty ratio input, which comprises the following steps of obtaining the minimum duty ratio Dmin of a PWM (Pulse-Width Modulation) signal when a backlight driving IC (Integrated Circuit) works; comparing the required duty ratio D required to be input by the automobile manufacturer with the working duty ratio Dx; if the required duty ratio D is not larger than the set working duty ratio Dx, adjusting the PWM frequency output to the backlight driving IC to fL; and if the required duty ratio D is greater than the set working duty ratio Dx, adjusting the PWM frequency output to the backlight driving IC to fH. The invention aims to providethe abnormal sound prevention backlight driving method based on the low duty ratio input, and by adopting the technical scheme provided by the invention, the technical problem that an existing vehicle-mounted backlight driving IC cannot realize abnormal sound prevention and backlight brightness adjustment at the same time under the condition of low duty ratio input is solved.

Description

technical field [0001] The present invention relates to the technical field of backlight driving methods, in particular to a low duty cycle input-based anti-abnormal backlight driving method. Background technique [0002] With the development of the automobile industry, the number of display screens in the car is increasing, the size is getting larger and the brightness is getting higher and higher. Various IC factories have also introduced different types of backlight driver ICs. Although there are many types of backlight driver ICs, the basic implementation principles are similar. The input voltage is increased through a boost circuit, and then controlled by PWM (Pulse Width Modulation). The current of the LED realizes the constant current drive of the LED. The constant current driving method can ensure that the LEDs meet the expected brightness requirements, and ensure that the brightness and chromaticity of each LED remain consistent, and effectively extend its service ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
CPCG09G3/3406G09G3/3413
Inventor 谢永全杨承波冯钦周晓晖黄邦善
Owner HUIZHOU DESAY SV AUTOMOTIVE