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Matrix-type high-resolution low-EMI LED driving circuit

An LED driving, high-resolution technology, applied in the field of LED control, can solve the problems of EMI and capacitance whistling, difficult to achieve high-resolution, etc., to achieve the effect of improving the image accuracy

Active Publication Date: 2019-05-31
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure DC mode is difficult to achieve high resolution due to the cost and size, and the pure PWM mode is difficult to solve the problems of EMI and capacitor noise due to the switch.

Method used

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  • Matrix-type high-resolution low-EMI LED driving circuit
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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] For the matrix LED driver, since its own COM is time-sharing conduction, the actual period of the PWM control method needs to be divided by the number of COMs. If COM=4, for the internal oscillation frequency of 10MHz, the minimum PWM The conduction time is 100ns, if the resolution is set to 10bit(2 0 / 2 10 ~2 10 / 2 10 ), and then consider the time-sharing of COM=4, then it is equivalent to a PWM cycle of 100ns*2 10 *4=409.6us, the corresponding fre...

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PUM

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Abstract

The invention provides a matrix-type high-resolution low-EMI LED driving circuit. The LED driving circuit splits the current level of resolution into a combination of a PWM control mode and a DC control mode. A DC control module has a current level greater than that of a PWM control module. Thus, frequent switching is avoided in the DC control module, thereby not resulting in a large impact on thesupply voltage frequently. The PWM control module has a low current and cannot generate a large impact on supply voltage even when being frequently switched on and off, thereby avoiding the problem of capacitor whistling. Moreover, a dynamic adjustment module is provided such that the voltage of a reference current module, the voltage of the PWM control module, and the voltage of the DC control module are the same, thereby improving the mirror image accuracy of the ILED.

Description

technical field [0001] The present invention relates to the technical field of LED control, and more specifically, relates to a matrix type LED drive circuit with high resolution and low EMI. Background technique [0002] With the progress of the times, LED lights are more and more widely used in people's lives, so the requirements for LED drivers are getting higher and higher. From monochrome to color to true color, the image display effect is becoming more and more abundant. Getting closer to realistic colors. [0003] At present, LED drivers, especially matrix-type LED driver circuits, are widely used in computers, mice, keyboards and various smart home appliances, especially for providing simple response and interesting forms of expression for human-computer interaction. The matrix LED driving circuit can realize large-scale display effect with a small chip area, and has a very wide application prospect. Early LED drivers did not have high requirements for display, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30
Inventor 吴斯敏张忠杜黎明孙洪军
Owner SHANGHAI AWINIC TECH CO LTD
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