LED large screen display device and driving circuit and driving method thereof

Abstract

The invention relates to an LED large screen display device and a driving circuit and a driving method thereof. The driving circuit of the LED large screen display device comprises a high-current driving circuit, a low-current driving circuit and a driving current selection module, wherein the high-current driving circuit is used for driving LEDs with high current to enable the LEDs to give out high-brightness light, the low-current driving circuit is used for driving the LEDs with low current to enable the LEDs to give out low-brightness light, and the driving current selection module is used for respectively selecting the high-current driving circuit or the low-current driving circuit to drive a plurality of LEDs at positions corresponding to multiple regions on the basis of brightness information of the multiple regions of to-be-displayed images. According to the technical scheme, the LEDs are driven by high constant current in a high-brightness region to enable brightness to be improved while the LEDs are driven by low constant current in a low-brightness region to eliminate the unbalance influence caused by narrow pulse widths, and accordingly low-gray brightness uniformity of images displayed by an LED large screen is improved while contrast ratio is increased. Further, the driving circuit is low in cost, and perfect visual effects can be achieved in low-gray regions.

Description

technical field [0001] The present invention relates to the field of LED application, more specifically, to an LED large-screen display device, a driving circuit and a driving method thereof. Background technique [0002] In the LED large screen display industry, if you want to obtain the expected brightness requirements and ensure the consistency of the brightness and chromaticity of each LED, basically all LED large screens use constant current source driver chips. According to the brightness requirements, choose a suitable drive current. This method will not cause any problems in the high-brightness area. In the low-brightness area, due to the difference between the driver chips, the brightness between the chips will be inconsistent, and due to the individual differences of the LED lights, color spots will be formed in the low-brightness area, resulting in The screen inconsistency is more serious. [0003] At present, in the display driving method of full-color LED larg...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a driving circuit for a LED large-screen display device in view of the defects of low-gray, uneven brightness, and inability to improve the contrast of the display screen existing in the above-mentioned full-color LED large-screen display drive of the prior art

[0006] Another technical problem to be solved by the present invention is to provide a LED large-screen display device for the defects of low gray, uneven brightness, and inability to improve the contrast of the display screen existing in the above-mentioned full-color LED large-screen display drive of the prior art.

[0007] Another technical problem to be solved by the present invention is to provide a large-screen LED display device for the defects of low-gray brightness, uneven brightness, and inability to improve the contrast of the display screen existing in the above-mentioned full-color LED large-screen display drive of the prior art. drive method

Images