# US 12,762,990 B2 · Over-current protection circuit and display panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,762,990 B2 - Document ID: US12762990B2 - Status: Granted - Kind: B2 - Application number: 19/293,410 - Filed: 2025-08-07 - Published: 2026-02-12 - Granted: 2026-10-13 - Earliest claimed: 2024-08-09 - Assignees: Hkc Corporation Limited - Applicants: Hkc Corporation Limited - Inventors: Yiran Wang; Jiawei Han; Shuang Chen; Jie Wang; Li Lv; Haijiang Yuan - Web page: https://patentgrep.com/patent/US12762990B2 ## CPC - G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - H02H 9/025: {Current limitation using field effect transistors} - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2330/023: using energy recovery or conservation - G09G 2330/025: Reduction of instantaneous peaks of current - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) ## Abstract An over-current protection circuit includes a current comparison module, a discharge control module, and a variable resistance module. The current comparison module is connected to a reference power supply and a target line. The discharge control module includes a first transistor. The control end of the first transistor is connected to the output end of the current comparison module, the first end and the second end of the first transistor are connected to the target line and the variable resistance module, respectively. The variable resistance module has at least a high-resistance state and a low-resistance state. The over-current protection circuit is used to protect the GOA signal line of the display panel. ## Claims ### Claim 1 An over-current protection circuit, comprising: a current comparison module, wherein a first input end of the current comparison module is connected to a reference power supply, and a second input end of the current comparison module is connected to a target line; a discharge control module, comprising a first transistor, wherein a control end of the first transistor is connected to an output end of the current comparison module, and a first end of the first transistor is connected to the target line; and a variable resistance module, wherein a second end of the first transistor is connected to a ground end through the variable resistance module, and the variable resistance module has at least a high-resistance state and a low-resistance state; wherein when a current in the target line is greater than a current of the reference power supply, the variable resistance module is in the low-resistance state, and when the current in the target line is less than the current of the reference power supply, the variable resistance module is in the high-resistance state; wherein the variable resistance module comprises a memristor, a negative electrode of the memristor is connected to the second end of the first transistor; wherein the discharge control module further comprises a second transistor, a control end of the second transistor is connected to the output end of the current comparison module, a first end of the second transistor is connected to a positive electrode of the memristor, and a second end of the second transistor is connected to the ground end; when the current in the target line is greater than the current of the reference power supply, the current flows from the target line, the first transistor, the negative electrode of the memristor, the positive electrode and the negative electrode of the memristor, and the second transistor to the ground end; and wherein the over-current protection circuit further comprises a reset module, when the current in the target line is less than the current of the reference power supply, the reset module makes the current flow from the positive electrode of the memristor to the negative electrode of the memristor. ### Claim 2 (depends on 1) The over-current protection circuit according to claim 1, wherein the positive electrode of the memristor is directly or indirectly connected to a reset power supply; and the reset module comprises a third transistor, a control end of the third transistor is connected to a reset signal line, a first end of the third transistor is connected to the negative electrode of the memristor, and a second end of the third transistor is directly or indirectly connected to the ground end. ### Claim 3 (depends on 2) The over-current protection circuit according to claim 2, wherein the reset module further comprises a fourth transistor, a control end of the fourth transistor is connected to the reset signal line, a first end of the fourth transistor is connected to the reset power supply, and a second end of the fourth transistor is connected to the positive electrode of the memristor. ### Claim 4 (depends on 3) The over-current protection circuit according to claim 3, wherein the reset module further comprises a current-limiting resistor, and the current-limiting resistor is connected to the second end of the third transistor and the ground end. ### Claim 5 (depends on 3) The over-current protection circuit according to claim 3, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the first transistor and the second transistor are both N-channel transistors, the third transistor and the fourth transistor are both P-channel transistors, and the reset signal line is connected to the output end of the current comparison module. ### Claim 6 (depends on 3) The over-current protection circuit according to claim 3, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the first transistor, the second transistor, the third transistor, and the fourth transistor are all N-channel transistors. ### Claim 7 (depends on 3) The over-current protection circuit according to claim 3, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the current comparison module comprises a current comparator, a first input end of the current comparator is connected to the reference power supply, and a second input end of the current comparator is connected to the target line. ### Claim 8 (depends on 7) The over-current protection circuit according to claim 7, wherein the reference power supply is a constant-current source, and the first input end of the current comparator is connected to the constant-current source, or the reference power supply is a voltage source; and the over-current protection circuit further comprises a current-sampling resistor, and the first input end of the current comparator is connected to the reference power supply through the current-sampling resistor. ### Claim 9 A display panel, comprising: an over-current protection circuit; and a gate driver on array (GOA) signal line, connected to the over-current protection circuit; wherein the over-current protection circuit comprises: a current comparison module, wherein a first input end of the current comparison module is connected to a reference power supply, and a second input end of the current comparison module is connected to a target line; a discharge control module, comprising a first transistor, wherein a control end of the first transistor is connected to an output end of the current comparison module, and a first end of the first transistor is connected to the target line; and a variable resistance module, wherein a second end of the first transistor is connected to a ground end through the variable resistance module, and the variable resistance module has at least a high-resistance state and a low-resistance state; wherein when a current in the target line is greater than a current of the reference power supply, the variable resistance module is in the low-resistance state, and when the current in the target line is less than the current of the reference power supply, the variable resistance module is in the high-resistance state; wherein the variable resistance module comprises a memristor, a negative electrode of the memristor is connected to the second end of the first transistor; wherein the discharge control module further comprises a second transistor, a control end of the second transistor is connected to the output end of the current comparison module, a first end of the second transistor is connected to a positive electrode of the memristor, and a second end of the second transistor is connected to the ground end; when the current in the target line is greater than the current of the reference power supply, the current flows from the target line, the first transistor, the negative electrode of the memristor, the positive electrode and the negative electrode of the memristor, and the second transistor to the ground end; and wherein the over-current protection circuit further comprises a reset module, when the current in the target line is less than the current of the reference power supply, the reset module makes the current flow from the positive electrode of the memristor to the negative electrode of the memristor. ### Claim 10 (depends on 9) The display panel according to claim 9, wherein the positive electrode of the memristor is directly or indirectly connected to a reset power supply; and the reset module comprises a third transistor, a control end of the third transistor is connected to a reset signal line, a first end of the third transistor is connected to the negative electrode of the memristor, and a second end of the third transistor is directly or indirectly connected to the ground end. ### Claim 11 (depends on 10) The display panel according to claim 10, wherein the reset module further comprises a fourth transistor, a control end of the fourth transistor is connected to the reset signal line, a first end of the fourth transistor is connected to the reset power supply, and a second end of the fourth transistor is connected to the positive electrode of the memristor. ### Claim 12 (depends on 11) The display panel according to claim 11, wherein the reset module further comprises a current-limiting resistor, and the current-limiting resistor is connected to the second end of the third transistor and the ground end. ### Claim 13 (depends on 11) The display panel according to claim 11, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the first transistor and the second transistor are both N-channel transistors, the third transistor and the fourth transistor are both P-channel transistors, and the reset signal line is connected to the output end of the current comparison module. ### Claim 14 (depends on 13) The display panel according to claim 13, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the first transistor, the second transistor, the third transistor, and the fourth transistor are all N-channel transistors. ### Claim 15 (depends on 11) The display panel according to claim 11, wherein when the current in the target line is greater than the current of the reference power supply, the current comparison module outputs a high-level signal; and the current comparison module comprises a current comparator, a first input end of the current comparator is connected to the reference power supply, and a second input end of the current comparator is connected to the target line. ### Claim 16 (depends on 15) The display panel according to claim 15, wherein the reference power supply is a constant-current source, and the first input end of the current comparator is connected to the constant-current source, or the reference power supply is a voltage source; and the over-current protection circuit further comprises a current-sampling resistor, and the first input end of the current comparator is connected to the reference power supply through the current-sampling resistor.