Self-adaptive SPWM (sinusoidal pulse width modulation) algorithm for constant-current LED (light-emitting diode) driving chip based on gray data

A technology of LED driving and grayscale data, which is applied in the direction of static indicators, instruments, energy-saving control technology, etc., can solve the problems of unreasonable grouping, low PWM refresh rate, and difficulty in achieving uniform dispersion, so as to improve visual fluency, Improve the effect of display refresh rate

Pending Publication Date: 2022-05-27
CHINA KEY SYST & INTEGRATED CIRCUIT
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Problems solved by technology

[0008] The purpose of the present invention is to provide an adaptive SPWM algorithm for constant current LED driver chips based on grayscale data, to solve the problem of traditional PWM with low refresh rate, low grayscale, low gray spots, unreasonable grouping, and uniform printing. Difficult problems with discrete implementation

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  • Self-adaptive SPWM (sinusoidal pulse width modulation) algorithm for constant-current LED (light-emitting diode) driving chip based on gray data
  • Self-adaptive SPWM (sinusoidal pulse width modulation) algorithm for constant-current LED (light-emitting diode) driving chip based on gray data
  • Self-adaptive SPWM (sinusoidal pulse width modulation) algorithm for constant-current LED (light-emitting diode) driving chip based on gray data

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Embodiment Construction

[0025] The self-adaptive SPWM algorithm of a constant current LED driver chip based on grayscale data proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

[0026] image 3 and Figure 4 It is a schematic diagram of a constant current LED driver chip provided by the present invention with a low gray level evenly scattered. According to the algorithm of the present invention, when the grayscale data is divisible by 4 or the remainder is 1 or 2 or 3 when the grayscale data is divisible by 4, the optimization level K=1 or 2 is determined. The mi...

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Abstract

The invention discloses a self-adaptive SPWM (sinusoidal pulse width modulation) algorithm for a constant-current LED (light-emitting diode) driving chip based on gray data, and belongs to the field of LED display. And setting a display gray data bit N and an optimization level K, and when the gray data is exactly divided by 4 or the remainder of the exactly divided by 4 is 1 / 2 / 3, determining that the optimization level K is equal to 1 or 2, and different optimization levels K correspond to different scattering group numbers and the number of GCLKs at least contained in each group. According to the algorithm, on the basis of the OSPWM algorithm, the conditions of low-gray display, refresh rate, uniform scattering and the like are comprehensively considered, the overall display effect is not changed, the refresh rate and low-gray display optimization of a display picture are considered in a unified mode according to gray data, self-adaptive grouping scattering and low-gray display optimization are achieved, and the picture is softer, finer and clearer.

Description

technical field [0001] The invention relates to the technical field of LED display, in particular to an adaptive SPWM algorithm of a constant current LED driving chip based on grayscale data. Background technique [0002] LED full-color display is a new type of information display media that developed rapidly in the world in the 1990s. It combines modern high-tech and has a series of advantages such as low power consumption, long service life, environmental protection, bright colors, and wide viewing range. . [0003] The traditional large-screen LED display system has encountered many problems, such as low refresh rate, residual image, uneven display and so on. At present, there are roughly two ways to control the brightness of LEDs: one is to use an analog circuit for dimming, this method is to linearly change the current flowing through the LED; the other is digital dimming, that is, using a PWM control method, using a switch circuit to change The duty cycle of the driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G2320/02G09G2320/0233Y02B20/40
Inventor 彭杰范学仕唐茂洁
Owner CHINA KEY SYST & INTEGRATED CIRCUIT
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