Pre-charging circuit for common-anode LED display screen driving chip

A technology of LED display and pre-charging circuit, applied in static indicators, instruments, etc., can solve the problems of high and low gray coupling, poor display of cross-board color difference, and the first line of LED display screen is dark, so as to improve cross-board color difference. , Improve the effect of high and low gray coupling

Active Publication Date: 2020-10-16
四川遂宁市利普芯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some poor display problems in the LED display, such as the darkening of the first row, high-low gray coupling, and cross-board color difference.

Method used

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  • Pre-charging circuit for common-anode LED display screen driving chip

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] refer to figure 1 As shown, a kind of precharging circuit of common anode LED display driver chip of the present invention comprises:

[0027] The input terminal is used to input the pre-charge pull-up signal UP1, the pre-charge pull-up signal UP2 and the pre-charge pull-down signal DN;

[0028] The output terminal is connected in series with resistor R0 for output potential;

[0029] The first operational amplifier is coupled with a second PMOS transistor and a third PMOS transistor, and inputs a precharge pull-up signal UP1 and a precharge pull-up signal UP2 through the second PMOS transistor and the third PMOS transistor;

[0030] The second operational amplifier is coupled to a seventh NMOS transistor, and inputs a precharge pull-down signal DN through the seventh NMOS transistor;

[0031] Wherein, by configuring the values ​​of t...

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PUM

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Abstract

The invention discloses a pre-charging circuit for a common-anode LED display screen driving chip, which comprises an input end, an output end, a first operational amplifier and a second operational amplifier, wherein the input end is used for inputting a pre-charging pull-up signal UP1, a pre-charging pull-up signal UP2, and a pre-charging pull-down signal DN; the output end is connected with theresistor R0 in series and is used for outputting potential; the first operational amplifier is coupled with a second PMOS transistor and a third PMOS transistor, and inputs a pre-charging pull-up signal UP1 and a pre-charging pull-up signal UP2 through the second PMOS transistor and the third PMOS transistor; the second operational amplifier is coupled with a seventh NMOS transistor and inputs apre-charging pull-down signal DN through the seventh NMOS transistor; values of pre-charging pull-up signals UP1 and UP2 and a pre-charging pull-down signal DN input by an input end are configured, and a potential value output by an output end is configured after the values are subjected to operational amplification by the first operational amplifier and the second operational amplifier. The circuit has the advantages that the display effect of the LED display screen is improved, and the phenomena of lower ghosting, first line darkness, high-low gray coupling and cross-plate color difference in the LED display screen are effectively improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a precharging circuit for a common anode LED display driver chip. Background technique [0002] The LED display screen is an electronic display screen composed of LED dot matrix. By turning on and off the traffic light beads to replace the screen display content forms such as text, animation, pictures, and video, the timely conversion is performed, and the component display control is performed through a modular structure. It is mainly divided into display module, control system and power supply system. The display module is a dot matrix of LED lights to form a screen to emit light; the control system is to control the on and off conditions in the area to convert the content displayed on the screen; the power system is to convert the input voltage and current to meet the needs of the display screen. The LED display screen is scanned and displayed. The system drives t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32Y02D10/00
Inventor 唐永生李雪民张宏根徐银森
Owner 四川遂宁市利普芯微电子有限公司
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