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An anti-abnormal backlight driving method based on low duty cycle input
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A technology of backlight drive and low duty cycle, applied to static indicators, instruments, etc., can solve problems such as inability to prevent, adjust backlight brightness, abnormal noise, etc., to meet dimming and prevent abnormal noise, and make up for unresponsiveness The effect of low duty cycle requirements
Active Publication Date: 2021-11-30
HUIZHOU DESAY SV AUTOMOTIVE
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[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
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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] like 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 the b...
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 cycle 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 present invention relates to the technical field of backlight driving methods, in particular to an anti-abnormal noise backlight driving method based on low duty ratio input, comprising the following steps: obtaining the minimum duty ratio Dmin of the PWM signal when the backlight driver IC is working; It is required to input the required duty cycle D and the working duty cycle Dx; 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; if the required duty cycle D is greater than the set duty cycle Dx, and the PWM frequency output to the backlight driver IC is adjusted to fH. 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.
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 ...
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