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LED driving chip display control distributed PWM algorithm

A technology of LED drive and PWM algorithm, applied to static indicators, instruments, etc., to achieve the effect of solving low gray blocks and improving refresh rate

Pending Publication Date: 2020-09-11
CHINA KEY SYST & INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a LED driver chip display control distributed PWM algorithm to solve the current problem of display color blocks under low gray conditions

Method used

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  • LED driving chip display control distributed PWM algorithm

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Embodiment 1

[0029] The present invention provides a display control distributed PWM algorithm for an LED drive chip, and its flow is as follows figure 1 As shown, including the following steps:

[0030] Step S11: Set the number of digits for displaying gray-scale binary data N and the refresh multiple M, where N is a positive integer and M is a non-negative integer less than N;

[0031] Set N-bit binary gray data D N-1 D N-2 ...D 1 D 0 , Input from the outside to the driver chip, the range is 0~2 N -1, where N is a positive integer; the refresh multiple M is a multiple that the refresh rate is improved compared to the traditional bit-weighted PWM algorithm, and M is a non-negative integer less than N.

[0032] Step S12: Break the entire display period to 2 according to the refresh multiple M M Segment sub-period, each segment sub-period contains 2 K Clock cycles, where K=N-M;

[0033] For the entire display period, the total number of clock cycles for each break up sub-cycle is 2 M , The number of...

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Abstract

The invention discloses an LED driving chip display control distributed PWM algorithm, and belongs to the technical field of LED display. The algorithm includes: setting a display gray binary data bitN and a refresh multiple M, wherein N is a positive integer and M is a non-negative integer less than N; according to the refresh multiple M, scattering the whole display period into 2M sub-periods,wherein each sub-period comprises 2K clock periods, and K is equal to N-M; dividing the gray scale data into M-bit high-order data and K-bit low-order data according to the refresh multiple M; averagely distributing the high-order data to 2M sections of sub-periods according to the size of the gray scale data; scattering and distributing the low-order data in 2M sections of sub-periods according to the size of the gray scale data; and combining the high-order data and the low-order data to generate distributed PWM scatter data. On the basis of a traditional PWM display algorithm, the display period is scattered through the distributed PWM algorithm, and the overall refresh rate is increased on the premise that the total gray scale is not changed; and supplementary design is performed on the distributed PWM algorithm, so that the problem of low gray blocks is effectively solved.

Description

Technical field [0001] The invention relates to the field of LED display technology, in particular to an LED drive chip display control distributed PWM algorithm. 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 visual range. . The traditional large-screen LED display system has encountered many problems, such as low refresh rate, residual image, and uneven display. In practical applications, higher requirements are required for LED drivers. Not only do they hope that the LED drivers can support the adjustment of light brightness, but also that they can meet the requirements of high-quality images and accurately reproduce the full color spectrum required for full-motion video. Summary of the invention [0003] The purpose of t...

Claims

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Application Information

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IPC IPC(8): G09G3/32
CPCG09G3/32G09G2320/0271
Inventor 李鸣晓夏云汉范学仕唐茂洁
Owner CHINA KEY SYST & INTEGRATED CIRCUIT
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