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

A display control method and technology for driving chips, which can be applied to static indicators, instruments, etc., can solve the problem of increasing the cost of raw materials for LED display equipment, and achieve the effects of saving raw material costs, high LED utilization, and high image quality.

Inactive Publication Date: 2011-01-05
南京德普达电子技术有限公司
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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 t...

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

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Embodiment Construction

[0027] In the prior art, the source image frame period (the commonly used PC-based image frame rate is 60Hz, and its frame period is 16.66ms) is equally divided into several refresh periods, and the product of the total number of these refresh periods and the source image frame rate is the LED display The refresh rate of the device. In each refresh cycle, each gray scale is displayed sequentially according to its respective weight, and the gray scale with a higher weight is displayed for a longer time to produce different gray scales. The present invention is based on FPGA design, and its image transmission, image frame buffer, grayscale generation, OE integration during different refresh cycles, etc. are all implemented by FPGA logic.

[0028]Considering the entire source image frame period, since the image data displayed in different refresh periods in the same frame period are the same, it is possible to integrate those low-gray-scale OEs that do not occupy a whole OE sub-f...

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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 ...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 谌高扬
Owner 南京德普达电子技术有限公司
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