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A power module, a power control circuit and a method for improving insufficient discharge of a display panel

A technology of power control circuit and power module, which is applied to control/regulating systems, electrical components, adjusting electrical variables, etc., and can solve the problems of difficult control of power-off sequence, insufficient discharge, insufficient shutdown and discharge, etc.

Active Publication Date: 2020-08-04
NANJING CEC PANDA LCD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the display panel of the GDM circuit (that is, the gate drive circuit is designed in the display panel), it is necessary to connect all the thin-film transistors TFT of all the GDM circuits to the on-state voltage VGH to discharge the TFTs of the GDM circuit when it is turned off. At this time, the power-down sequence of the on-state voltage VGH is required to be slow and the on-state voltage VGH should be maintained at a higher voltage for a period of time, but the speed of the power-off sequence is not easy to control, and it is very easy to cause insufficient discharge during shutdown
[0003] Since all the thin film transistors TFT are connected to the on-state voltage VGH through the reset signal Reset to discharge when the power is turned off, and the on-state voltage VGH is also in a power-down state when the power is off, so the time for the on-state voltage VGH to maintain a higher voltage is insufficient. Insufficient discharge problem

Method used

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  • A power module, a power control circuit and a method for improving insufficient discharge of a display panel
  • A power module, a power control circuit and a method for improving insufficient discharge of a display panel
  • A power module, a power control circuit and a method for improving insufficient discharge of a display panel

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Embodiment

[0025] figure 2 Shown is a schematic structural diagram of the power control circuit of the present invention, and the power control circuit only outputs the on-state voltage VGH.

[0026] The power control circuit includes a power module 10 and a charge pump boost circuit connected to the power module 10 , and the charge pump boost circuit outputs an on-state voltage VGH.

[0027] Wherein the power module 10 outputs an analog voltage AVDD, which includes a timing and voltage controller (Timing & Voltage controller) 11, a register unit (EEPROM) 12 connected to the timing and voltage controller 11, a voltage generating unit (VGH regulator) connected to the register unit 12 ) 13 and an external power input unit (Internal logicpower supply) 14.

[0028] Wherein, the timing and voltage controller 11 controls the output of each voltage and timing control. The register value of the register unit 12 can be rewritten by the software corresponding to the power module 10, and the tim...

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Abstract

The invention discloses a power supply module, a power supply control circuit and a method for improving insufficient discharge of a display panel, which belong to the technical field of display panels. The power supply module comprises a timing and voltage controller, a register unit connected with the timing and voltage controller, a voltage generating unit connected with the register unit, andan external power supply input unit. The register unit is provided with a first temporary storage space and a second temporary storage space. The current output from the first temporary storage spaceto the current output pin of a rectifier tube is greater than the current output from the second temporary storage space to the current output pin of the rectifier tube. According to the invention, different adjustment current corresponds to different adjustment tube voltage, and thus achieving the purpose of generating two different VGHs; shutting down and VGH voltage upraise are realized simplythrough software adjustment; a peripheral hardware circuit is not added; and the cost and the layout of the PCB space are not affected.

Description

technical field [0001] The invention relates to the technical field of a display panel, in particular to a power supply module, a power supply control circuit and a method for improving insufficient discharge of a display panel. Background technique [0002] For the display panel of the GDM circuit (that is, the gate drive circuit is designed in the display panel), it is necessary to connect all the thin-film transistors TFT of all the GDM circuits to the on-state voltage VGH to discharge the TFTs of the GDM circuit when it is turned off. At this time, it is required that the power-off sequence of the on-state voltage VGH be slow and maintain the on-state voltage VGH at a higher voltage for a period of time, but the speed of the power-off sequence is not easy to control, and it is very easy to cause insufficient discharge during shutdown. [0003] Since all the thin film transistors TFT are connected to the on-state voltage VGH through the reset signal Reset to discharge whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157G09G3/20
CPCG09G3/20H02M3/157
Inventor 黄蕾廖木山
Owner NANJING CEC PANDA LCD TECH
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