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LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost

A technology of dynamic display and display system, applied in static indicators, instruments, etc., can solve the problems of inconvenient use, relatively large hardware changes, and poor effects, and achieves elimination of afterimages, good shadow elimination effects, and hardware changes. less effect

Inactive Publication Date: 2012-06-27
杭州士兰控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the above principle of display afterimage generation, it can be known that the key to eliminate afterimage is to discharge the parasitic charge of the switch tube during line switching. The existing methods for eliminating image afterimage are either ineffective or need to add additional components. Devices and control lines, the changes to the hardware are relatively large, and it is not very convenient to use

Method used

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  • LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost
  • LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost
  • LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost

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Embodiment Construction

[0024] The invention proposes an LED display system that can simply and effectively eliminate residual images in LED dynamic display. The system does not need to change the traditional system architecture, and adds a discharge module inside the constant current drive circuit. When using it, it only needs to connect the second end of each switch tube to a different constant current drive circuit, and modify the control program of the main controller. When the LED row is switched, the parasitic charge at the second end of the switched-off switch tube is discharged through the discharge module inside the constant current drive circuit, thereby eliminating image sticking.

[0025] LED display system that eliminates afterimages of LED dynamic display, including:

[0026] A power supply module 1, the power supply module 1 outputs a DC power supply to supply power to the LED array 2 and the constant current drive circuit 3;

[0027] LED array 2, the LED array 2 includes M rows and N...

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Abstract

The invention relates to an LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost includes a power supply module, an LED array, M switch tubes, a decoding circuit, multiple constant-current driving circuits and a main controller, wherein each constant-current driving circuit is provided with a discharge module, the main controller sends discharge control signals to communication and control modules of all constant-current driving circuits through a control bus when LED lines are being switched in the LED array during the dynamic displaying time, and the discharge module of each constant-current driving circuit discharges a spurious charge at the second end of each cut-off PMOS switch tube from an output port of the discharge module to the system. Superior ghost removing effect can be realized only through a minor hardware modification in the traditional LED display system and the system of the invention has strong practicability.

Description

technical field [0001] The invention relates to the field of LED display, in particular to an LED display system for eliminating afterimages in LED dynamic display. Background technique [0002] The display mode of the LED display system can be divided into static display and dynamic display. Static display means that each constant current source channel of the constant current drive circuit always drives a specific LED. Dynamic display means that each constant current source channel of the constant current drive circuit The source channels can respectively drive different LEDs at different times. [0003] Traditional LED display systems, such as figure 1 As shown, it mainly includes power module 1, LED array 2, constant current drive circuit 3, switch tube 6, decoding circuit 7 and main controller 8: power supply module 1 outputs DC power VCC for LED array 2 and constant current drive circuit 3 power supply; the LED array 2 is composed of M rows and N columns of LEDs, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
Inventor 陈帮勇赵启永陈日仪张世桥
Owner 杭州士兰控股有限公司
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