Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system

A technology of line scanning and LED array, applied in the field of LED display system and its line scanning circuit, can solve the problems affecting the display effect of LED display screen, and achieve the effect of eliminating image sticking

Active Publication Date: 2014-10-08
WUXI ETEK MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, due to the parasitic capacitance on the column line of the LED matrix, when the row is switched, the LED that should ...

Method used

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  • Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system
  • Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system
  • Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system

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Embodiment Construction

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0029] Please refer to image 3 As shown, it is a schematic circuit diagram of an LED display system in an embodiment of the present invention. The LED display system inc...

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PUM

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Abstract

The invention provides a light-emitting diode (LED) display system capable of eliminating the residual shadow of an LED display screen, and a line scanning circuit of the system. The line scanning circuit comprises a plurality of line switching tubes, a plurality of pre-discharge switches and line scanning control logic, wherein the first connecting end of each line switching tube is connected to supply voltage, and the second connecting end of each line switching tube is connected to a corresponding line; the first connecting end of each pre-discharge switch is connected to pre-discharge reference voltage, and the second connecting end of each pre-discharge switch is connected to the corresponding line; the line switching tube and the pre-discharge switch which are connected to the same line correspond to each other; the line scanning control logic is used for providing a plurality of line driving signals for the control ends of all the line switching tubes so as to control on or off of all the line switching tubes, and is used for providing a plurality of pre-discharge control signals for the control ends of all the pre-discharge switches so as to control on or off of all the pre-discharge switches. Pre-discharge is carried out on the lines in an LED array, so that the residual shadow of the LED display screen can be effectively eliminated.

Description

【Technical field】 [0001] The invention relates to the technical field of LED (Liquid Emitting Diode) display, in particular to an LED display system capable of eliminating afterimages on LED display screens and a row scanning circuit thereof. 【Background technique】 [0002] Generally, there are more or less afterimages (smearing / ghosting) in dynamic scanning LED displays, and the mechanism is due to the presence of parasitic capacitance at the chip output terminal, circuit board, and LED lamp port. When some devices are turned off at a certain moment, the corresponding parasitic capacitance will store residual charge, and the residual charge will be discharged through the channel at the next moment, so that the LED in the LED display screen that should not be lit is slightly bright, Afterimage phenomenon occurs. Please refer to figure 1 As shown, it is a schematic diagram of a partial circuit structure of an LED display screen using a 1 / 4 scan mode in the prior art. figur...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 史良俊汤大勇汪东
Owner WUXI ETEK MICROELECTRONICS
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