Ordinary constant flow source driving chip-based method for controlling grey scale display of light-emitting diode (LED)

Abstract

The invention relates to an ordinary constant flow source driving chip-based method for controlling grey scale display of a light-emitting diode (LED). In the method, gray scales, which are scattered in two different refreshing periods and only account for a half of output enabling (OE) subfield time, of an image in the same frame period are integrated into one refreshing period and gray scales which are scattered in four different refreshing periods and only account for a quarter of the OE subfield time are integrated into one refreshing period, namely, gray scales, which are scattered in N different refreshing periods and only account for one Nth of the OE subfield time, in the same frame period are integrated into one refreshing period so as to form a complete OE subfield and make full use of the subfield time. Under the control of a specific algorithm in a control system, an ordinary constant flow source driving chip can meet all requirements and achieve the effects of high refreshing rate, high gray scale, high picture quality, high LED utilization ratio and smooth gray scale transition, so that the raw material cost of LED display equipment is saved. Certain performance of the ordinary constant flow source driving chip controlled by the method is even superior to that of a built-in pulse-width modulation constant flow source driving chip.

Description

1. Technical field [0001] The technical field of the present invention is the LED display field. Especially the gray-scale LED image display control technology driven by ordinary constant current source driver chips, including LED large-screen display screens, LED light bars, LED lighting, etc. 2. Background technology [0002] At present, the mainstream control method based on ordinary constant current source driver chips in the industry is to divide the source image frame period (commonly used PC-based image frame rate is 60Hz, and its frame period is 16.66ms) into several refresh periods. The product of the total number and the frame rate of the source image is the refresh rate of the LED display device. In each refresh cycle, each gray scale is displayed sequentially according to their respective weights, and the gray scale with a higher weight is displayed for a longer time to produce different gray scales. Limited by the fixed source image frame period, this control ...

AI Technical Summary

Problems solved by technology

Although the built-in PWM constant current source driver chips currently on the market can better meet these requirements, the cost of built-in PWM driver chips is several times higher than that of ordinary constant current source driver chips, which increases the raw material cost of LED display equipment. quite a lot

However, the current mainstream display control devices based on ordinary constant current source driver chips cannot solve the contradiction between high refresh rate, low brightness loss, and high gray scale.

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