Detection circuit, detection method, and display device

Patent metadata

Field	Value
Publication number	US-2026011274-A1
Application number	US-202519250841-A
Country	US
Kind code	A1
Filing date	Jun 26, 2025
Priority date	Jul 2, 2024
Publication date	Jan 8, 2026
Grant date	—

Abstract

A display panel includes a display region and a non-display region. The detection circuit includes: a detection module, a detection line, and a temperature-sensing module. The detection module is arranged on the display panel; one end of the detection line is connected to the output end of the detection module, and another end of the detection line extends along the non-display region, surrounds the display region, and is connected to the receiving end of the detection module; the temperature-sensing module is connected to the detection line. The output end of the detection module provides a detection signal. The detection signal passes through the temperature-sensing module to form a feedback signal that changes with temperature. The receiving end of the detection module receives the feedback signal and determines the connection status of the detection line and the temperature change of the display panel based on the feedback signal.

First claim

What is claimed is:

1 . A detection circuit, applied to a display panel, comprising:
a display region and a non-display region surrounding the display region; wherein the detection circuit comprises: a detection module, provided on the display panel; a detection line, with one end connected to an output end of the detection module, and another end extending along the non-display region, surrounding the display region, and connected to a receiving end of the detection module; and a temperature-sensing module, connected to the detection line; wherein the output end of the detection module provides a detection signal, the detection signal forms a feedback signal that varies with temperature through the temperature-sensing module, the receiving end of the detection module receives the feedback signal and determines a connection state of the detection line and a temperature change of the display panel based on the feedback signal.

2 . The detection circuit according to claim 1 , wherein the temperature-sensing module comprises a first responsive switch, a resistance in the first responsive switch varies with temperature;
the first responsive switch is provided on the detection line, an input end of the first responsive switch is connected to the output end of the detection module through the detection line, and an output end of the first responsive switch is connected to the receiving end of the detection module through the detection line, and a control end of the first responsive switch is connected to a first power supply end, and the first power supply end provides a first control signal; and the control end of the first responsive switch responds to the first control signal, and the input end and the output end of the first responsive switch are conducted.

3 . The detection circuit according to claim 2 , wherein the temperature-sensing module further comprises a feedback resistor, an end of the feedback resistor is connected to the detection line between the first responsive switch and the receiving end of the detection module, and another end of the feedback resistor is connected to a ground line;
the feedback signal comprises a feedback voltage flowing through the feedback resistor and a feedback current flowing through the first responsive switch; the detection module detects a magnitude of the feedback current to determine the connection state of the detection line; and the detection module detects a magnitude of the feedback voltage to determine the temperature change of the display panel.

4 . The detection circuit according to claim 3 , wherein the temperature-sensing module further comprises a protection resistor, the protection resistor is provided in a detection line between the output end of the first responsive switch and the feedback resistor;
the receiving end of the detection module is connected to a line between the protection resistor and the feedback resistor.

5 . The detection circuit according to claim 3 , wherein the temperature-sensing module further comprises a protection capacitor;
the protection capacitor is connected in parallel with the feedback resistor, and an end of the protection capacitor is connected to a detection line between the first responsive switch and the receiving end of the detection module, and another end of the protection capacitor is connected to the ground line.

6 . The detection circuit according to claim 3 , wherein the temperature-sensing module further comprises a first resistor and a second resistor, an end of the first resistor is connected to the first power supply end, and another end of the second resistor is connected to the control end of the first responsive switch;
an end of the second resistor is connected to a line between the first resistor and the first responsive switch, and another end of the second resistor is connected to the ground line; and the first power supply end provides a first voltage signal, and the first voltage signal is divided by the first resistor to form the first control signal.

7 . The detection circuit according to claim 3 , wherein the temperature-sensing module further comprises a second responsive switch and a third responsive switch;
an input end of the second responsive switch is connected to the output end of the first responsive switch, and an output end of the second responsive switch is connected to the feedback resistor; an input end of the third responsive switch is connected to a control end of the second responsive switch, and an output end of the third responsive switch is connected to the ground line, and a control end of the third responsive switch is connected to a second power supply end; the second power supply end provides a second control signal, a control end of the second responsive switch responds to the second control signal, and the input end and the output end of the second responsive switch are conducted; and the control end of the third responsive switch is pulled down to a ground voltage provided by the ground line, and the input end and the output end of the third responsive switch are conducted, and the feedback voltage is formed on the feedback resistor.

8 . The detection circuit according to claim 7 , wherein the feedback current in the first responsive switch is positively correlated with the temperature change of the display panel, and the second responsive switch is a P-channel Metal-Oxide-Semiconductor (PMOS) transistor, and the third responsive switch is a N-channel Metal-Oxide-Semiconductor (NMOS) transistor.

9 . The detection circuit according to claim 3 , wherein the ground line is provided in the non-display region and at least surrounds part of the display region.

10 . A detection method, wherein the detection method detects a display panel based on a detection circuit, and the display panel comprises a display region and a non-display region surrounding the display region;
the detection circuit comprises: a detection module, a detection line, and a temperature-sensing module; the detection module is provided on the display panel, one end of the detection line is connected to an output end of the detection module, and another end of the detection line extends along the non-display region, surrounds the display region, and is connected to a receiving end of the detection module; the temperature-sensing module is connected to the detection line; wherein the detection method comprises: controlling the output end of the detection module to provide a detection signal, wherein the detection signal is transmitted to the temperature-sensing module through the detection line, the temperature-sensing module forms a feedback signal that varies with temperature based on the detection signal; and controlling the receiving end of the detection module to receive the feedback signal and determining a connection state of the detection line and a temperature change of the display panel based on the feedback signal.

11 . The detection method according to claim 10 , wherein determining the connection state of the detection line and the temperature change of the display panel based on the feedback signal comprises:
obtaining a waveform of the feedback signal and comparing the waveform of the feedback signal with a waveform of the detection signal to obtain a waveform difference between the feedback signal and the detection signal; and determining the connection state of the detection line and the temperature change of the display panel based on the waveform difference.

12 . The detection method according to claim 10 , wherein the detection circuit further comprises: a first responsive switch, a second responsive switch

Assignees

• Hkc Corp Ltd

Inventors

• Wu Meng
• Hu Jun
• Cao Zhenpeng
• Yuan Haijiang

Classifications

• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• G09G2320/041

  Temperature compensation · 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