Method and system for testing oled display device

Patent metadata

Field	Value
Publication number	US-2016247429-A1
Application number	US-201414435766-A
Country	US
Kind code	A1
Filing date	Sep 29, 2014
Priority date	Mar 31, 2014
Publication date	Aug 25, 2016
Grant date	—

Abstract

The present disclosure provides a method and a system for testing an OLED display device. The method includes steps of: applying a testing signal to the to-be-tested OLED display device; acquiring a measured distribution image for a testing region of the OLED display device to which the testing signal is applied; comparing the measured distribution image with a corresponding calibrated distribution image so as to obtain a comparison result; determining whether or not there is a back plate abnormal point at the testing region in accordance with the comparison result; and when the comparison result indicates that there is a back plate abnormal point at the testing region, determining a position of the back plate abnormal point on the OLED display device.

First claim

1 . A method for testing an organic light-emitting diode (OLED) display device, comprising steps of:
applying a testing signal to the to-be-tested OLED display device; acquiring a measured distribution image for a testing region of the OLED display device to which the testing signal is applied; comparing the measured distribution image with a corresponding calibrated distribution image so as to obtain a comparison result; determining whether or not there is a back plate abnormal point at the testing region in accordance with the comparison result; and when the comparison result indicates that there is a back plate abnormal point at the testing region, determining a position of the back plate abnormal point on the OLED display device.

2 . The method according to claim 1 , wherein the measured distribution image is an infrared spectrum distribution image or a heat distribution image.

3 . The method according to claim 1 , wherein the step of acquiring the measured distribution image for the testing region of the OLED display device to which the testing signal is applied comprises:
dividing the testing region of the OLED display device into a plurality of detection regions; and acquiring the measured distribution images for the detection regions sequentially.

4 . The method according to claim 1 , wherein the testing region of the OLED display device is a single detection region.

5 . The method according to claim 1 , wherein the testing region of the OLED display device is a pixel region of the OLED display device, or a combined region consisting of a pixel region of the OLED display device and a peripheral circuit region of the OLED display device.

6 . The method according to claim 1 , wherein the calibrated distribution image is a theoretical distribution image for a standard OLED display device to which the testing signal is applied, and
the standard OLED display device is of a structure identical to the to-be-tested OLED display device, and free of circuit defects.

7 . The method according to claim 1 , wherein the calibrated distribution image is a distribution image for a standard OLED display device to which the testing signal is not applied, and
the standard OLED display device is of a structure identical to the to-be-tested OLED display device, and free of circuit defects.

8 . The method according to claim 1 , wherein the calibrated distribution image is a distribution image for the to-be-tested OLED display device to which the testing signal is not applied.

9 . The method according to claim 8 , wherein prior to the step of applying the testing signal to the to-be-tested OLED display device, the method further comprises steps of:
acquiring a distribution image for the testing region of the OLED display device; and taking the distribution image as the calibrated distribution image and storing the calibrated distribution image.

10 . The method according to claim 1 , wherein prior to the step of applying the testing signal to the to-be-tested OLED display device, the method further comprises steps of:
placing the OLED display device onto a testing platform; acquiring an alignment mark of the OLED display device by an imaging device; aligning the OLED display device in accordance with the alignment mark; and attaching an OLED circuit emulation board onto the OLED display device.

11 . The method according to claim 1 , wherein the step of determining the position of the back plate abnormal point on the OLED display device comprises:
acquiring an alignment mark of the to-be-tested OLED display device acquired by an imaging device during an alignment, generating a coordinate system of the to-be-tested OLED display device in accordance with the alignment mark, and when it is determined that there is a back plate abnormal point in the measured distribution image, determining the position of the back plate abnormal point on the OLED display device in accordance with the coordinate system.

12 . The method according to claim 1 , wherein when the comparison result indicates that there is a back plate abnormal point at the testing region, the method further comprises a step of:
marking the back plate abnormal point in the measured distribution image.

13 . The method according to claim 1 , wherein when the comparison result indicates that there is a back plate abnormal point at the testing region, the method further comprises steps of:
matching image information about the back plate abnormal point in the measured distribution image with a previously stored back plate abnormal point information base, preliminarily determining a cause for the back plate abnormal point, and outputting the cause.

14 . The method according to claim 1 , wherein subsequent to the step of determining the position of the back plate abnormal point on the OLED display device, the method further comprises a step of:
moving a microscope device to the position for observation.

15 . The method according to claim 1 , wherein the OLED display device is an OLED thin film transistor (TFT) back plate, or an evaporated or printed OLED display panel, or an OLED display module where the circuit assembly has been finished.

16 . A system for testing an organic light-emitting diode (OLED) display device, comprising:
a testing signal applying device, configured to apply a testing signal to the to-be-tested OLED display device; an imaging device, configured to acquire and display a measured distribution image for a testing region of the OLED display device to which the testing signal is applied; and a processor, configured to compare the measured distribution image with a corresponding calibrated distribution image so as to obtain comparison result, determine whether or not there is a back plate abnormal point at the testing region in accordance with the comparison result, and when the comparison result indicates that there is a back plate abnormal point at the testing region, determine a position of the back plate abnormal point on the OLED display device.

17 . The system according to claim 16 , wherein the imaging device is a charge coupled device (CCD) imager capable of acquiring heat information or infrared information.

18 . The system according to claim 16 , further comprising:
a testing platform, wherein the imaging device is further configured to acquire an alignment mark of the OLED display device placed on the testing platform, and the processor is further configured to align the OLED display device in accordance with the alignment mark.

19 . The system according to claim 16 , further comprising:
a microscope device; and a controller, configured to move the microscope device to the position for observation.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Yanzhao
• Wang Gang
• Fang Jingang
• Zhao Hui
• Zha Qijun

Classifications

• 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

• G01J5/48

  Thermography; Techniques using wholly visual means · CPC title

• G01J2001/4247

  for testing lamps or other light sources · CPC title

• G09G2360/147

  the originated light output being determined for each pixel · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title