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Power supply voltage synchronization circuit and display device of same

A technology of power supply voltage and synchronous circuit, applied in output power conversion devices, electrical components, and AC power input to AC power output, etc., can solve problems such as electrostatic discharge diode damage, and achieve the effect of avoiding collapse

Active Publication Date: 2018-03-23
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The design specification of the breakdown voltage of the electrostatic discharge diode is approximately equal to the middle voltage, but usually the high voltage is ready before the middle voltage, so the electrostatic discharge diode may be subjected to an excessively high voltage and operate in the breakdown region, while an excessively high current will cause Can cause damage to ESD diodes

Method used

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  • Power supply voltage synchronization circuit and display device of same
  • Power supply voltage synchronization circuit and display device of same
  • Power supply voltage synchronization circuit and display device of same

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0066] figure 1 It is a system diagram of a display device according to an embodiment of the present invention. Please refer to figure 1 , in this embodiment, the display device 100 includes a power supply circuit 110, a power supply voltage synchronization circuit 120, a source driver 130 and a display panel 140, wherein the power supply circuit 110 receives the main power supply voltage Vin to provide the digital power required by the source driver 130 The voltage DVDD, the gamma reference voltage VGMA, the first power voltage AVDD, the second power voltage HAVDD and the ground voltage GND.

[0067] The source driver 130 is coupled to the power supply circuit 110 and the display panel 140, and has at least a driving circuit 131, a first power line LP1, a second power line LP2, and a ground...

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Abstract

The invention discloses a power supply voltage synchronization circuit and a display device of the same. The power supply voltage synchronization circuit comprises a comparator circuit, a voltage output determination circuit and a synchronization control circuit, wherein the comparator circuit provides a voltage difference between first power supply voltage and second power supply voltage; the voltage output determination circuit decides to output the first power supply voltage or grounded voltage according to the voltage difference and reference voltage; and the synchronization control circuit determines whether to output the first power supply voltage or the grounded voltage provided by the voltage output determination circuit based on the second power supply voltage.

Description

technical field [0001] The present invention relates to a voltage synchronous circuit, and in particular to a power supply voltage synchronous circuit and a display device thereof. Background technique [0002] In order to increase the protection capability of Electrostatic Discharge (ESD), the source driver IC (SDIC) will place electrostatic discharge components between each power line (or power electrode), such as electrostatic discharge diodes or electrostatic discharge Block the circuit to prevent breakdown of abnormal surge and large voltage. The current source drivers for high-resolution applications are mostly half-voltage designs. An electrostatic discharge diode is added inside the source driver IC between the high voltage and the intermediate voltage, where the intermediate voltage is about half of the high voltage. The design specification of the breakdown voltage of the electrostatic discharge diode is approximately equal to the middle voltage, but usually the ...

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Application Information

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IPC IPC(8): H02M5/293
CPCH02M5/293H02M5/2932
Inventor 陈柏锟罗敬谚
Owner AU OPTRONICS CORP