Over-current protection method for display panel and display device

Patent metadata

Field	Value
Publication number	US-11514869-B2
Application number	US-201917264300-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 25, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

The present application discloses an over-current protection method for display panel and a display device. The over-current protection method for display panel includes the following steps: calculating current input by a level shifter during a first preset time of a first clock signal after the first clock signal is received; determining whether the current input by the level shifter during the first preset time is larger than a first preset current; controlling the level shifter to stop running in determining that the current input by the level shifter during the first preset time is larger than the first preset current.

First claim

What is claimed is:

1. An over-current protection method for display panel, comprising the following steps:
calculating a current input by a level shifter during a first preset time of a first clock signal after the first clock signal is received;
determining whether the current input by the level shifter during the first preset time is larger than a first preset current; and
controlling the level shifter to stop running in determining that the current input by the level shifter during the first preset time is larger than the first preset current,
wherein after the determining whether the current input by the level shifter during the first preset time is larger than the first preset current, the method further comprises:
calculating the current input by the level shifter during a second preset time in determining that the current input by the level shifter during the first preset time is less than the first preset current;
determining whether the current input by the level shifter during the second preset time is larger than a second preset current; and
controlling the level shifter to stop running in determining that the current input by the level shifter during the second preset time is larger than the second preset current,
wherein the calculating the current input by the level shifter during the second preset time in determining that the current input by the level shifter during the first preset time is less than the first preset current comprises:
calculating an effective current input by the level shifter during an effective time of each clock signal; and
calculating an average current input by the level shifter during the second preset time according to the effective current input by the level shifter during the effective time of each clock signal,
wherein the calculating the average current input by the level shifter during the second preset time according to the effective current input by the level shifter during the effective time of each clock signal comprises:
obtaining a preset number of inputting the effective current by the level shifter according to the effective current input by the level shifter during the effective time of each clock signal;
accumulating preset numbers of clock signals to obtain a total preset number m; and
calculating the average current input by the level shifter during the second preset time according to a formula I=m*Iocp/10n, wherein Iocp is a current threshold, and n is a number of the clock signals.

2. The over-current protection method for display panel according to claim 1 , wherein the preset number is a number of instantaneous currents input by the level shifter during the effective time of each clock signal being larger than the current threshold.

3. The over-current protection method for display panel according to claim 1 , wherein the first preset current is larger than the second preset current.

4. The over-current protection method for display panel according to claim 1 , wherein the second preset time is an accumulation of the effective times of the clock signals.

5. The over-current protection method for display panel according to claim 1 , wherein the effective time is a time of inputting normal working current by the level shifter during each clock signal, the effective current is an average current input by the level shifter during each effective time.

6. The over-current protection method for display panel according to claim 1 , wherein the first preset time is a duration before the level shifter inputs normal working current during the first clock signal.

7. A display device, comprising a memory, a processor, and an over-current protection program for display panel stored in the memory and executable by the processor, when the processor executes the over-current protection program for display panel, the following steps are realized:
calculating a current input by a level shifter during a first preset time of a first clock signal when the first clock signal is received;
determining whether the current input by the level shifter during the first preset time is larger than a first preset current; and
controlling the level shifter to stop running when the current input by the level shifter during the first preset time is larger than the first preset current,
wherein after the determining whether the current input by the level shifter during the first preset time is larger than the first preset current, the method further comprises:
calculating the current input by the level shifter during a second preset time in determining that the current input by the level shifter during the first preset time is less than the first preset current;
determining whether the current input by the level shifter during the second preset time is larger than a second preset current; and
controlling the level shifter to stop running in determining that the current input by the level shifter during the second preset time is larger than the second preset current,
wherein the calculating the current input by the level shifter during the second preset time in determining that the current input by the level shifter during the first preset time is less than the first preset current comprises:
calculating an effective current input by the level shifter during an effective time of each clock signal; and
calculating an average current input by the level shifter during the second preset time according to the effective current input by the level shifter during the effective time of each clock signal,
wherein the calculating the average current input by the level shifter during the second preset time according to the effective current input by the level shifter during the effective time of each clock signal comprises:
obtaining a preset number of inputting the effective current by the level shifter according to the effective current input by the level shifter during the effective time of each clock signal;
accumulating preset numbers of clock signals to obtain a total preset number m; and
calculating the average current input by the level shifter during the second preset time according to a formula I=m*Iocp/10n, wherein Iocp is a current threshold, and n is a number of the clock signals.

8. The display device according to claim 7 , wherein the display device further comprises a display panel and a circuit board, the display panel being connected to the circuit board, the over-current protection program for display panel being embedded in the circuit board.

9. The display device according to claim 8 , wherein the display device is a television, the display panel is a liquid crystal display panel.

Assignees

• Hkc Corp Ltd

Inventors

• Qiu Bin

Classifications

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• G09G2330/04

  Display protection · CPC title

• G09G2330/025

  Reduction of instantaneous peaks of current · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title