Detecting method and detecting circuit of LCD panel

Patent metadata

Field	Value
Publication number	US-11348496-B2
Application number	US-201916626542-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Oct 12, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A detecting method and a detecting circuit of a LCD panel are provided. The method includes steps of: a detecting module in real time detecting a waveform of a pulse detecting signal inputted into the LCD panel; providing a feedback of the waveform of the pulse detecting signal to a pulse output module; determining whether the waveform of the pulse detecting signal is deformed by the pulse output module; correcting the pulse detecting signal by the pulse output module if the waveform of the pulse detecting signal is determined to be deformed; inputting a corrected pulse detecting signal to the LCD panel to detect the LCD panel. The disclosure prevents from abnormal display panel images resulted from a shorting bar lit-up method, reduces over checking or missing, and find out defects quickly and correctly by operators or detecting equipment to enhance quality and benefits and to reduce cost.

First claim

What is claimed is:

1. A detecting method of a liquid crystal display panel, comprising steps of:
a detecting module in real time detecting a waveform of a pulse detecting signal inputted into the liquid crystal display panel, and providing a feedback of the waveform of the pulse detecting signal to a pulse signal output module;
determining whether the waveform of the pulse detecting signal is deformed by the pulse signal output module;
determining whether the pulse detecting signal is satisfied a correcting condition if the waveform of the pulse detecting signal is determined to be deformed; and
correcting the pulse detecting signal by the pulse signal output module if the waveform of the pulse detecting signal is determined to be satisfied the correcting condition, and inputting a corrected pulse detecting signal to the liquid crystal display panel to detect the liquid crystal display panel, wherein the correcting condition is that a voltage of the pulse detecting signal after corrected is equal to or less than a working voltage of the pulse signal output module.

2. The detecting method of the liquid crystal display panel according to claim 1 , wherein the step of determining whether the waveform of the pulse detecting signal is deformed by the pulse signal output module, comprises steps of:
obtaining a characteristic parameter of the waveform of the pulse detecting signal by the pulse signal output module; and
comparing the characteristic parameter with a characteristic parameter of a predetermined waveform to determine whether the waveform of the pulse detecting signal is deformed.

3. The detecting method of the liquid crystal display panel according to claim 2 , wherein the characteristic parameter of the waveform of the pulse detecting signal comprises at least one of an amplitude of the pulse detecting signal, a rise time of the pulse detecting signal, a fall time of the pulse detecting signal, a pulse width of the pulse detecting signal, and a repeating period of the pulse detecting signal.

4. The detecting method of the liquid crystal display panel according to claim 3 , wherein the step of correcting the pulse detecting signal by the pulse signal output module, comprises steps of:
obtaining a difference between the characteristic parameter of the waveform of the pulse detecting signal and a characteristic parameter of the predetermined waveform; and
correcting the pulse detecting signal according to the difference.

5. The detecting method of the liquid crystal display panel according to claim 1 , further comprising following steps before correcting the pulse detecting signal, wherein the steps comprises:
stopping from outputting the pulse detecting signal and alarming if the pulse detecting signal is determined not to satisfy the correcting condition.

6. A detecting circuit for a liquid crystal display panel, comprising a pulse signal output module and a detecting module;
wherein the pulse signal output module outputs a pulse detecting signal configured to detect the liquid crystal display panel, the detecting module is configured to detect a waveform of the pulse detecting signal in real time and configured to provide a feedback of the waveform to the pulse signal output module, and the pulse signal output module is configured to determine whether the pulse detecting signal is satisfied a correcting condition if the waveform of the pulse detecting signal is determined to be deformed, configured to correct the pulse detecting signal if the waveform of the pulse detecting signal is determined to be satisfied the correcting condition, and configured to input a corrected pulse detecting signal to the liquid crystal display panel to detect the liquid crystal display panel, wherein the correcting condition is that a voltage of the pulse detecting signal after corrected is equal to or less than a working voltage of the pulse signal output module.

7. The detecting circuit for the liquid crystal display panel according to claim 6 , wherein the pulse signal output module is further configured to obtain a characteristic parameter of the waveform of the pulse detecting signal and configured to compare the characteristic parameter with a characteristic parameter of a predetermined waveform to determine whether the waveform of the pulse detecting signal is deformed.

8. The detecting circuit for the liquid crystal display panel according to claim 7 , wherein the characteristic parameter of the waveform of the pulse detecting signal comprises at least one of an amplitude of the pulse detecting signal, a rise time of the pulse detecting signal, a fall time of the pulse detecting signal, a pulse width of the pulse detecting signal, and a repeating period of the pulse detecting signal.

9. The detecting circuit for the liquid crystal display panel according to claim 8 , wherein the pulse signal output module is further configured to obtain a difference between the characteristic parameter of the waveform of the pulse detecting signal and a characteristic parameter of the predetermined waveform and configured to correct the pulse detecting signal according to the difference.

10. The detecting circuit for the liquid crystal display panel according to claim 6 , wherein the pulse signal output module is further configured to stop from outputting the pulse detecting signal and configured to alarm if the pulse detecting signal is determined not to satisfy the correcting condition.

Assignees

• Shenzhen China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Wang Chaoqun
• Wu Kewei

Classifications

• G09G3/3648 Primary

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G02F1/1309

  Repairing; Testing · CPC title

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G2330/10

  Dealing with defective pixels · CPC title