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Display substrate detection method and device

A technology for display substrates and detection methods, applied in static indicators, instruments, etc., can solve problems such as uneven thickness of metal oxide film, threshold voltage shift, and drop in on-state current.

Active Publication Date: 2022-03-25
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the reason of the metal oxide sputtering equipment, the thickness of the metal oxide film layer formed in the target area and the non-target area is uneven. The threshold voltage of the driving transistor shifts, and the on-state current drops, and the target area and the non-target area are prone to display unevenness (mura). Therefore, it is necessary to test the display substrate

Method used

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  • Display substrate detection method and device
  • Display substrate detection method and device
  • Display substrate detection method and device

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Embodiment 1

[0053] figure 2 A schematic flowchart of a method for detecting a display substrate provided by an embodiment of the present invention, such as figure 2 As shown, the detection method of the display panel includes the following steps:

[0054] S201 , the threshold voltage of the driving transistor in the pixel driving circuit in the display substrate is activated.

[0055] It should be noted that, a plurality of pixel driving circuits distributed in an array are provided on the display substrate for driving corresponding light-emitting diodes in the display substrate to emit light to form a display. The driving transistors in the pixel driving circuit have a certain threshold voltage. Due to the metal oxide sputtering equipment, the threshold voltages of some driving transistors in the display substrate are likely to be shifted forward, and the on-state current of the light-emitting diodes decreases. In the embodiment of the present invention, the threshold voltage of the ...

Embodiment 2

[0089] Based on the same inventive concept, an embodiment of the present invention provides a detection device for a display substrate, Figure 9 A schematic structural diagram of a detection device for a display substrate provided by an embodiment of the present invention, such as Figure 9 As shown, the detection device of the display substrate includes: an excitation unit 901 , an input unit 902 , a collection unit 903 , a detection image generation unit 904 , and a judgment unit 905 .

[0090] The excitation unit 901 is used to excite the threshold voltage of the driving transistor in the pixel driving circuit in the display substrate. The input unit 902 is used for inputting detection signals to the pixel driving circuit in the display substrate. The collection unit 903 is used to collect the voltage output by the pixel driving circuit. The detection image generation unit 904 is configured to input the collected voltage output by the pixel driving circuit into the detec...

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Abstract

The invention provides a method and device for detecting a display substrate, belonging to the field of display technology, which can solve the problem of low detection accuracy of poor display unevenness in the target area and non-target area of ​​the existing display substrate. The detection method of the display substrate of the present invention includes: exciting the threshold voltage of the driving transistor in the pixel driving circuit in the display substrate; inputting a detection signal to the pixel driving circuit in the display substrate; collecting the output voltage of the pixel driving circuit; The voltage output by the pixel driving circuit is input into the detection device, and a detection image is generated; according to the detection image, it is judged whether the display substrate is normal.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a detection method and device for a display substrate. Background technique [0002] At present, organic light-emitting diode (OLED) display panels can be made of oxide thin-film transistors. In the production process, metal oxides are generally deposited on glass substrates by sputtering process, so as to make various display devices. A display substrate is formed. Wherein, the area facing the target material on the glass substrate during the preparation process is the target material area, and the gap area between adjacent target material areas is the non-target material area. Due to the metal oxide sputtering equipment, the thickness of the metal oxide film layer formed in the target area and the non-target area is not uniform. Correspondingly, the target area of ​​the formed display substrate is likely to cause problems in the pixel driving circuit. The thresho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/00
CPCG09G3/006G09G2300/0842G09G2310/0278G09G2230/00G09G3/3258G09G2320/0233G09G2320/029G09G3/36G09G2310/08
Inventor 李广耀丁远奎倪柳松汪军王海涛王东方
Owner BOE TECH GRP CO LTD