Driving mode for improving LED gray scale display stability

Abstract

The invention discloses a driving mode for improving LED gray scale display stability, and relates to the field of LED display control. The design thinking of the invention is as follows: for 65536-grade gray scale, only sixteen fields need to be displayed all together, when the display field and the time corresponding to each among sixteen-bit data are controlled, the display field is reduced, and corresponding delay time is also added, i.e., displaying of multiple fields is replaced through a delay of the display time. Subsequent data is then processed after the delay ends, different delay time is arranged for each field, and the target of fold increases of the display time between adjacent fields is realized. The driving mode has the following advantages: based on the high-efficiency data processing capability of an FPGA, through reducing the frequency of LED module control signals, under the condition that the display gray scale grade is ensured, noise points are reduced, the stability is enhanced, and the anti-interference performance is improved.

Description

technical field [0001] The invention designs an LED display driving method, and in particular relates to a driving method for improving the stability of LED grayscale display. Background technique [0002] In LED display, grayscale refers to the brightness level from dark to bright in the image. The higher the level, the more realistic and detailed the image. The grayscale scanning driving method is the key to controlling the LED display. At present, the control of the gray scale is mainly realized by controlling the light-emitting time of the LED, and the control circuit is used to turn on and off at high speed to obtain a fine gray scale. [0003] The general LED display driver reproduces each gray level through the "field" method. [0004] The display time of the field is different. At a very high refresh rate, the gray scale can be reproduced by matching different fields. For example, 8-bit data can reproduce 256 gray levels, and 16-bit data can reproduce 65536 gra...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, the unit time of one field is the time when the LED group data is shifted by one line, and when the shift of each line ends, the LED module control signals OE and STB are triggered to display the field of this line, with 8-bit 256-level gray scale For example, the highest field is fully lit in the entire unit time, and the lighting time of the front field is halved in turn, then the total lighting efficiency is (1+2+4+8+16+32+64+128) / (128 * 8) = 0.25, and the brightness brought by this is obviously not enough, so the overall time of all fields is doubled, for example, the highest bit shows 16 full bright fields, the second highest bit shows 8 full bright fields, and a total of 34 fields are displayed , the lighting efficiency is ((16+8+4+2+1)*128+64+32+16)) / (128*(16+8+4+2+1+3))= 0.94)

[0006] This greatly improves the display brightness, but it also creates problems. Currently, the gray levels supported by the display screens on the market can reach 4096 or even higher, and the total number of fields will be very large. According to the characteristics of LED display, the module The change frequency of the OE and STB control signals on the computer will be very high, especially the STB signal, because it is a pulse one by one, the anti-interference ability is relatively weak, and it is easy to cause flicker or noise on the display