LED (light emitting diode) display large-screen high-speed scanning controller

A high-speed scanning, large-screen technology, applied in static indicators, instruments, etc., can solve problems such as errors and D44 bright display, and achieve the effect of eliminating influence, improving refresh rate, and eliminating smearing.

Active Publication Date: 2014-06-18
上海得倍电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, the fourth column array has the same problem. Both D34 and D44 will light up and cause display errors.

Method used

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  • LED (light emitting diode) display large-screen high-speed scanning controller
  • LED (light emitting diode) display large-screen high-speed scanning controller
  • LED (light emitting diode) display large-screen high-speed scanning controller

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] Such as Figure 5 As shown, the LED display large-screen high-speed scanning controller of the present invention includes: a LED large-screen driver chip, which is connected to a decoder; the decoder decodes the control signal, and the decoder is connected as a power switch A switch tube, the switch tube controls the voltage of several rows of light-emitting diodes LED; a controllable high-speed discharge circuit discharges the output terminal when the switch tube is turned off.

[0026] The controllable discharge circuit can control the discharge level; the control range of the discharge level is Vdd-1V to VDD-2V, preferably, the controllable discharge circuit controls the discharge level to be Vdd-1.4V.

[0027] The discharge time of the controllable high-speed discharge circuit is less than 10 microseconds, and the entire output can be set to a high-impedance state when the discharge is stopped after the time is reached. Preferably, the discharge time of the control...

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PUM

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Abstract

The invention discloses an LED (light emitting diode) display large-screen high-speed scanning controller, which comprises an LED large-screen driving chip, a decoder and a controllable high-speed discharging circuit, wherein the LED large-screen driving chip is connected with the decoder, the decoder decodes control signals and is connected with a switch tube used as a power supply switch, the switch tube controls the voltage of a plurality of lines of LEDs, the controllable high-speed discharging circuit performs discharging on the output end when the switch tube is switched off. The LED display large-screen high-speed scanning controller has the advantages that the scanning line output falling edge can reach one microsecond, the controllable discharging is carried out on scanning lines, and the output end after the discharging can be controlled into a high impedance state. The trailing phenomenon is eliminated, the refreshing rate is improved, and the influence caused by LED electricity leakage and open circuit can be eliminated.

Description

technical field [0001] The invention relates to the field of LED large-screen display. Background technique [0002] LED display can be divided into static screen and scanning screen. The so-called static screen means that the R / G / BLED of each pixel has an independent control terminal. The image is displayed on the entire screen at the same time within one frame. The so-called scanning screen refers to several rows of R / G / B LEDs sharing a control terminal, and these rows are powered by timing to achieve the purpose of displaying a complete image. For example: take 1 / 4 scan as an example, first divide a frame time into 4 parts, display the first line in 0-1 / 4 time, and display the second line in 1 / 4-2 / 4 time , and so on. Obviously, in this case, the image is not displayed on the entire screen at the same time in one frame, 1 / 4 of the image is displayed first, and then another 1 / 4 of the image is displayed, and the complete image is displayed after 4 1 / 4. It is not diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
Inventor 乔红瑗杨晓鹏谢维奇丁佳卿
Owner 上海得倍电子技术有限公司
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