CN-122024605-A - Display substrate, testing method thereof, display panel and display device

CN122024605ACN 122024605 ACN122024605 ACN 122024605ACN-122024605-A

Abstract

The disclosure provides a display substrate, a testing method thereof, a display panel and a display device, relates to the technical field of display, and aims to solve the problems of low testing efficiency and high production cost in a production process. The display substrate comprises a light emitting element, a pixel circuit, a sensing circuit and a test control circuit. The pixel circuit is used for driving the light-emitting element to emit light. The pixel circuit is configured to transmit a first voltage signal to the first node under control of the light emission control signal, and to output a signal at the first node under control of the first scan signal. The sensing circuit is configured to transmit a second voltage signal to the second node in the presence of light and to output the first voltage signal under control of the second scan signal and a signal at the second node. The test control circuit is configured to time-share output of the signal from the sensing circuit and the signal from the pixel circuit under control of the test control signal. The display substrate is applied to a display device to realize biological recognition.

Inventors

SHI ZHIJIE
ZHANG KAI
ZHOU MAOLIN

Assignees

京东方科技集团股份有限公司
成都京东方光电科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (13)

1. A display substrate is characterized by comprising a light emitting element, a pixel circuit, a sensing circuit and a test control circuit; The pixel circuit is coupled with the light emitting element, is configured to drive the light emitting element to emit light, is further coupled with a light emitting control end, a first voltage end and a first scanning end, comprises a first node, and is configured to transmit a first voltage signal from the first voltage end to the first node under the control of a light emitting control signal from the light emitting control end and output a signal at the first node under the control of a first scanning signal from the first scanning end; The sensing circuit is configured to transmit a second voltage signal from the second voltage terminal to the second node when the sensing circuit is illuminated, and to output the first voltage signal from the first voltage terminal under control of a second scanning signal from the second scanning terminal and a signal at the second node; The test control circuit is further coupled to the test control terminal, the pixel circuit and the sensing circuit, and is configured to output signals from the sensing circuit and signals from the pixel circuit in a time-sharing manner under the control of a test control signal from the test control terminal.
2. The display substrate of claim 1, wherein the pixel circuit and the test control circuit are both coupled to a data terminal; The pixel circuit is configured to output a signal at the first node to the data terminal under control of a first scanning signal of the first scanning terminal; the test control circuit is configured to output a signal from the sensing circuit to the data terminal under control of a test control signal from the test control terminal.
3. The display substrate of claim 2, wherein the test control circuit comprises a first transistor, a control electrode of the first transistor is coupled to the test control terminal, a first electrode of the first transistor is coupled to the sensing circuit, and a second electrode of the first transistor is coupled to the data terminal.
4. The display substrate according to claim 2, wherein the pixel circuit further comprises: the data writing sub-circuit is coupled with the first node, the first scanning end and the data end, and is configured to output a signal at the first node to the data end and input a data signal from the data end to the first node under the control of a first scanning signal of the first scanning end.
5. The display substrate of claim 4, wherein the data writing sub-circuit comprises a second transistor, a control electrode of the second transistor coupled to the first scan terminal, a first electrode of the second transistor coupled to the data terminal, and a second electrode of the second transistor coupled to the first node.
6. The display substrate of claim 4, wherein the pixel circuit further comprises: The first light-emitting control sub-circuit is coupled with the light-emitting control end, the first voltage end and the first node and is configured to transmit the first voltage signal to the first node under the control of the light-emitting control signal; And the driving sub-circuit is coupled with the first light-emitting control sub-circuit and the data writing sub-circuit and is configured to generate a driving signal for driving the light-emitting element to emit light according to the first voltage signal and the data signal.
7. The display substrate of claim 1, wherein the sensing circuit further comprises a light sensing sub-circuit and an output sub-circuit; The light sensing sub-circuit is coupled with the second node and the second voltage terminal and is configured to transmit the second voltage signal to the second node when the light sensing sub-circuit is illuminated; The output sub-circuit is coupled to the second node, the first voltage terminal, the test control circuit, and the second scan terminal, and is configured to transmit the first voltage signal to the test control circuit under control of a signal at the second node and the second scan signal.
8. The display substrate according to claim 7, wherein the light-sensing sub-circuit comprises a photoelectric conversion element and a first capacitor; A first end of the photoelectric conversion element is coupled with the second node, and a second end of the photoelectric conversion element is coupled with the second voltage end; a first end of the first capacitor is coupled with the second node, and a second end of the first capacitor is coupled with the second voltage end; The control electrode of the third transistor is coupled to the second node, the first electrode of the third transistor is coupled to the first voltage terminal, the second electrode of the third transistor is coupled to the first electrode of the fourth transistor, the control electrode of the fourth transistor is coupled to the second scan terminal, and the second electrode of the fourth transistor is coupled to the test control circuit.
9. The display substrate of claim 1, wherein the pixel circuit further comprises a first reset sub-circuit coupled to a third scan terminal, the first node, and a first initiation terminal, the first reset sub-circuit configured to transmit a first initiation signal from the first initiation terminal to the first node under control of a third scan signal from the third scan terminal.
10. The display substrate of claim 9, wherein the first initiation terminal and the test control terminal are connected to the same signal terminal.
11. A display panel, comprising: The display substrate according to any one of claims 1 to 10; And the touch control layer is arranged on the display substrate.
12. A display device, comprising: The display panel of claim 11; And a driving circuit board coupled with the display panel and configured to provide display control signals to the display panel.
13. A method of testing a display substrate, wherein the display substrate is as claimed in any one of claims 1 to 10, the method comprising: The pixel circuit transmits the first voltage signal to the first node under the control of the light-emitting control signal; The pixel circuit transmits the signal at the first node to the test control circuit under the control of the first scanning signal; the test control circuit outputs a signal from the pixel circuit under the control of a first level of the test control signal; After the sensing circuit is illuminated, the second voltage signal is transmitted to the second node, and the first voltage signal is transmitted to the test control circuit under the control of the second scanning signal and the signal at the second node; the test control circuit outputs the received signal from the sensing circuit under the control of the second level of the test control signal.

Description

Display substrate, testing method thereof, display panel and display device Technical Field The disclosure relates to the technical field of display, in particular to a display substrate, a testing method thereof, a display panel and a display device. Background In order to improve the security performance of electronic products, biometric identification technology is generally used to identify the identity of a user. The under-screen fingerprint identification technology is used as a conventional biological characteristic identification technology, and is widely applied to mobile terminal equipment such as mobile phones, tablet computers, vehicle-mounted equipment, wearable equipment and the like at present so as to realize man-machine interaction and biological identification functions. In general, a fingerprint recognition circuit may be added to a display device to enable the display device to realize a fingerprint recognition function. In this way, in the production process of the display device, when testing the circuit in the display device, it is necessary to test the newly added fingerprint recognition circuit in addition to the existing circuit in the display device. Therefore, how to improve the testing efficiency of the circuit and reduce the production cost in the production process of the display device is an important technical problem currently faced. Disclosure of Invention The embodiment of the disclosure provides a display substrate, a testing method thereof, a display panel and a display device, and aims to improve circuit testing efficiency in a production process and reduce production cost. In order to achieve the above object, the embodiments of the present disclosure adopt the following technical solutions: In one aspect, a display substrate is provided. The display substrate comprises a light emitting element, a pixel circuit, a sensing circuit and a test control circuit. The pixel circuit is coupled with the light emitting element. The pixel circuit is configured to drive the light emitting element to emit light. The pixel circuit is also coupled with the light-emitting control end, the first voltage end and the first scanning end. The pixel circuit includes a first node. The pixel circuit is configured to transmit a first voltage signal from the first voltage terminal to the first node under control of a light emission control signal from the light emission control terminal, and to output a signal at the first node under control of a first scan signal from the first scan terminal. The sensing circuit is coupled to the first voltage terminal, the second voltage terminal, and the second scanning terminal. The sensing circuit includes a second node. The sensing circuit is configured to transmit a second voltage signal from the second voltage terminal to the second node in the event that the sensing circuit is illuminated, and to output a first voltage signal from the first voltage terminal under control of a second scan signal from the second scan terminal and a signal at the second node. The test control circuit is also coupled to the test control terminal, the pixel circuit, and the sensing circuit. The test control circuit is configured to time-share output of the signal from the sensing circuit and the signal from the pixel circuit under control of a test control signal from the test control terminal. In the display substrate provided by the embodiment of the disclosure, the signals from the pixel circuit and the signals from the induction circuit can be output to the test equipment for testing in a time-sharing manner under the control of the test control circuit, so that the pixel circuit and the induction circuit can be tested by adopting the same test equipment without replacing the test equipment, and the test efficiency of the circuit is improved in the production process. Therefore, the addition of extra testing equipment can be avoided, the production cost is effectively reduced, the waste of resource materials is reduced, and the production efficiency is improved. Moreover, the testing of the pixel circuit and the sensing circuit can be performed in the early stage of the production process, the abnormal substrate is screened out in advance, the waste of resource materials in the later stage of the production process is effectively avoided, and the production cost is reduced. In some embodiments, the pixel circuit and the test control circuit are both coupled to a data terminal. The pixel circuit is configured to output a signal at the first node to the data terminal under control of a first scan signal of the first scan terminal. The test control circuit is configured to output a signal from the sensing circuit to the data terminal under control of a test control signal from the test control terminal. In some embodiments, the test control circuit includes a first transistor having a control electrode coupled to the test control terminal, a first electrode coupled to the