# US 2022/0044604 A1 · Current detection device and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0044604 A1 - Document ID: US20220044604A1 - Status: Published application - Kind: A1 - Application number: 17/245,026 - Filed: 2021-04-30 - Published: 2022-02-10 - Earliest claimed: 2020-08-06 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Xinshe YIN; Xinbin HAN; Jianchao ZHU; Guangliang SHANG - Web page: https://patentgrep.com/patent/US20220044604A1 ## CPC - G09G 3/006: {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)} - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2330/06: Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation - G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof - 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) ## Abstract Disclosed in the embodiments of the present disclosure are a current detection device and a display device. The current detection device includes: a plurality of detection circuits; the detection circuit includes: a feedback compensation circuit and a current detection circuit; and the feedback compensation circuit is configured to generate a noise inversion signal by inverting a noise AC signal generated on the predetermined power line in the display panel and to provide the noise inversion signal to a first end of the current detection circuit; and the current detection circuit is configured to output a detection signal to the signal output end according to the noise inversion signal, the signal on the detection line and the signal of the reference voltage end. ## Claims ### Claim 1 A current detection device, comprising: a plurality of detection circuits; wherein the detection circuits each is connected to a respective one of detection lines in a display panel; and the detection circuit comprises: a feedback compensation circuit; and a current detection circuit; wherein: a first end of the feedback compensation circuit is electrically connected with a predetermined power line in the display panel; a second end of the feedback compensation circuit is electrically connected with a first end of the current detection circuit; the feedback compensation circuit is configured to: generate a noise inversion signal by inverting a noise AC signal generated on the predetermined power line in the display panel; and provide the noise inversion signal to the first end of the current detection circuit; the first end of the current detection circuit is electrically connected with the respective one detection line in the display panel; a second end of the current detection circuit is electrically connected with a reference voltage end; an output end of the current detection circuit is electrically connected with a signal output end; and the current detection circuit is configured to output a detection signal to the signal output end according to the noise inversion signal, a signal on the detection line and a signal of the reference voltage end. ### Claim 2 (depends on 1) The current detection device according to claim 1, wherein the feedback compensation circuit comprises: at least one noise extraction circuit, an inversion processing circuit, and a coupling circuit, wherein when each of the feedback compensation circuit comprises a plurality of noise extraction circuits, in the same feedback compensation circuit, different noise extraction circuits are electrically connected with different positions of the predetermined power line; the at least one noise extraction circuit is configured to: extract the noise AC signal at the electrically connected positions of the predetermined power line, and provide the noise AC signal to the inversion processing circuit; when each of the feedback compensation circuit comprises one noise extraction circuit, the inversion processing circuit is configured to generate the noise inversion signal by inverting the noise signal provided by the noise extraction circuit; or when each of the feedback compensation circuit comprises a plurality of noise extraction circuits, the inversion processing circuit is configured to generate the noise inversion signal by inverting the sum of the noise signals provided by the noise extraction circuits; and the coupling circuit is configured to: receive the noise inversion signal, and couple the noise inversion signal to the first end of the current detection circuit. ### Claim 3 (depends on 2) The current detection device according to claim 2, wherein the noise extraction circuit comprises: a blocking capacitor; and a first resistor; wherein: a first end of the blocking capacitor is electrically connected with the corresponding position of the predetermined power line, a second end of the blocking capacitor is electrically connected with a first end of the first resistor; and a second end of the first resistor is electrically connected with the inversion processing circuit. ### Claim 4 (depends on 2) The current detection device according to claim 2, wherein the inversion processing circuit comprises: a second resistor; and a first operational amplifier; wherein: a negative phase input end of the first operational amplifier is electrically connected with the noise extraction circuit; a positive phase input end of the first operational amplifier is electrically connected with the ground end; an output end of the first operational amplifier is electrically connected with the coupling circuit; a first end of the second resistor is electrically connected with the negative phase input end of the first operational amplifier; and the second end of the second resistor is electrically connected with the output end of the first operational amplifier. ### Claim 5 (depends on 2) The current detection device according to claim 2, wherein the coupling circuit comprises: a coupling capacitor; wherein: a first end of the coupling capacitor is electrically connected with the inversion processing circuit, and a second end of the coupling capacitor is electrically connected with the first end of the current detection circuit. ### Claim 6 (depends on 5) The current detection device according to claim 5, wherein the display panel further comprises a plurality of scanning lines, and a plurality of overlap capacitors are formed by one of the detection lines and the plurality of scanning lines at overlapping positions; and a difference between a capacitance of the coupling capacitor and a capacitance of the overlap capacitor satisfies a difference threshold, wherein the difference threshold is 0±ΔC, ΔC≤0.1. ### Claim 7 (depends on 1) The current detection device according to claim 1, wherein the current detection circuit comprises: a second operational amplifier, an integrating capacitor, and a control switch; wherein: a negative phase input end of the second operational amplifier is taken as the first end of the current detection circuit; a positive phase input end of the second operational amplifier is electrically connected with the reference voltage end; an output end of the second operational amplifier is electrically connected with the signal output end; a first end of the integrating capacitor is electrically connected with the negative phase input end of the second operational amplifier; and a second end of the integrating capacitor is electrically connected with the output end of the second operational amplifier; a first end of the control switch is electrically connected with the negative phase input end of the second operational amplifier; and a second end of the control switch is electrically connected with the output end of the second operational amplifier. ### Claim 8 (depends on 7) The current detection device according to claim 7, wherein the current detection circuit further comprises: a holding capacitor; wherein: a first end of the holding capacitor is electrically connected with the output end of the second operational amplifier, and a second end of the holding capacitor is electrically connected with a ground end. ### Claim 9 (depends on 1) A display device, comprising: a display panel, and the current detection device according to claim 1; wherein: the display panel comprises a display area and a non-display area; the display area comprises a plurality of sub-pixels and the plurality of detection lines, wherein each of the sub-pixels comprises a pixel circuit; and one column of the pixel circuits are electrically connected with one of the detection lines; the non-display area comprises the predetermined power line; the feedback compensation circuit in each of the detection circuits is electrically connected with the predetermined power line; and the first end of the current detection circuit in each of the detection circuits is electrically connected to a respective one of detection lines in a display panel. ### Claim 10 (depends on 9) The display device according to claim 9, wherein the feedback compensation circuit comprises: at least one noise extraction circuit, an inversion processing circuit, and a coupling circuit, wherein when each of the feedback compensation circuit comprises a plurality of noise extraction circuits, in the same feedback compensation circuit, different noise extraction circuits are electrically connected with different positions of the predetermined power line; the at least one noise extraction circuit is configured to: extract the noise AC signal at the electrically connected positions of the predetermined power line, and provide the noise AC signal to the inversion processing circuit; when each of the feedback compensation circuit comprises one noise extraction circuit, the inversion processing circuit is configured to generate the noise inversion signal by inverting the noise signal provided by the noise extraction circuit; or when each of the feedback compensation circuit comprises a plurality of noise extraction circuits, the inversion processing circuit is configured to generate the noise inversion signal by inverting the sum of the noise signals provided by the noise extraction circuits; and the coupling circuit is configured to: receive the noise inversion signal, and couple the noise inversion signal to the first end of the current detection circuit. ### Claim 11 (depends on 10) The display device according to claim 10, wherein when each of the feedback compensation circuits comprises a noise extraction circuit, the noise extraction circuit in each of the feedback compensation circuits is electrically connected with the same position in the predetermined power line. ### Claim 12 (depends on 10) The display device according to claim 10, wherein when each of the feedback compensation circuit comprises a plurality of noise extraction circuits, in the same feedback compensation circuit, different noise extraction circuits are electrically connected with different positions of the predetermined power line; and the noise extraction circuits in different feedback compensation circuits are electrically connected with the same position in the predetermined power line. ### Claim 13 (depends on 10) The display device according to claim 10, wherein the noise extraction circuit comprises: a blocking capacitor; and a first resistor; wherein: a first end of the blocking capacitor is electrically connected with the corresponding position of the predetermined power line; a second end of the blocking capacitor is electrically connected with a first end of the first resistor; and a second end of the first resistor is electrically connected with the inversion processing circuit. ### Claim 14 (depends on 10) The display device according to claim 10, wherein the inversion processing circuit comprises: a second resistor; and a first operational amplifier; wherein: a negative phase input end of the first operational amplifier is electrically connected with the noise extraction circuit; a positive phase input end of the first operational amplifier is electrically connected with the ground end; an output end of the first operational amplifier is electrically connected with the coupling circuit; a first end of the second resistor is electrically connected with the negative phase input end of the first operational amplifier; and the second end of the second resistor is electrically connected with the output end of the first operational amplifier. ### Claim 15 (depends on 10) The display device according to claim 10, wherein the coupling circuit comprises: a coupling capacitor; wherein: a first end of the coupling capacitor is electrically connected with the inversion processing circuit, and a second end of the coupling capacitor is electrically connected with the first end of the current detection circuit. ### Claim 16 (depends on 15) The display device according to claim 15, wherein the display panel further comprises a plurality of scanning lines, and a plurality of overlap capacitors are formed by one of the detection lines and the plurality of scanning lines at overlapping positions; and a difference between a capacitance of the coupling capacitor and a capacitance of the overlap capacitor satisfies a difference threshold, wherein the difference threshold is 0±ΔC, ΔC≤0.1. ### Claim 17 (depends on 9) The display device according to claim 9, wherein the current detection circuit comprises: a second operational amplifier, an integrating capacitor, and a control switch; wherein: a negative phase input end of the second operational amplifier is taken as the first end of the current detection circuit; a positive phase input end of the second operational amplifier is electrically connected with the reference voltage end; an output end of the second operational amplifier is electrically connected with the signal output end; a first end of the integrating capacitor is electrically connected with the negative phase input end of the second operational amplifier; and a second end of the integrating capacitor is electrically connected with the output end of the second operational amplifier; a first end of the control switch is electrically connected with the negative phase input end of the second operational amplifier; and a second end of the control switch is electrically connected with the output end of the second operational amplifier. ### Claim 18 (depends on 17) The display device according to claim 17, wherein the current detection circuit further comprises: a holding capacitor; wherein: a first end of the holding capacitor is electrically connected with the output end of the second operational amplifier, and a second end of the holding capacitor is electrically connected with a ground end.