# US 12,111,997 B2 · Electronic device to detect input based on a capacitance change and input of an input device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,111,997 B2 - Document ID: US12111997B2 - Status: Granted - Kind: B2 - Application number: 18/103,360 - Filed: 2023-01-30 - Published: 2023-10-19 - Granted: 2024-10-08 - Earliest claimed: 2022-04-15 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Chul Kim; Yun-Ho Kim - Web page: https://patentgrep.com/patent/US12111997B2 ## CPC - G06F 3/04182: {Filtering of noise external to the device and not generated by digitiser components} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 3/046: by electromagnetic means - G06F 2203/04106: Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An electronic device includes: a display layer; a sensor layer on the display layer, and including: a first electrode, and a second electrode adjacent to the first electrode; and a plurality of crossing electrodes; and a driving circuit electrically connected to the sensor layer to control an operation of the sensor layer. The sensor layer is to operate in a first touch mode to sense a first input signal, and a second touch mode to sense a second input signal of an input device to discharge a magnetic field, and the driving circuit is to sense coordinates of the input device based on a signal profile measured based on a first current having a first current direction formed in the first electrode by the input device, and a second current having a second current direction opposite to the first current direction formed in the second electrode by the input device. ## Claims ### Claim 1 An electronic device comprising: a display layer; a sensor layer on the display layer, and comprising: a plurality of electrodes comprising a first electrode, and a second electrode adjacent to the first electrode; and a plurality of crossing electrodes; and a driving circuit electrically connected to the sensor layer, and configured to control an operation of the sensor layer, wherein the sensor layer is configured to operate in a first touch mode to sense a first input signal based on a capacitance change, and a second touch mode to sense a second input signal of an input device configured to discharge a magnetic field, and wherein the driving circuit is configured to sense coordinates of the input device based on a signal profile, the signal profile being measured based on a first current having a first current direction formed in the first electrode by the magnetic field of the input device, and a second current having a second current direction opposite to the first current direction formed in the second electrode by the magnetic field of the input device. ### Claim 2 (depends on 1) The electronic device of claim 1, wherein the driving circuit comprises an analog front end comprising: an amplifier configured to amplify the first input signal and the second input signal; and a filter configured to remove noise from a signal output from the amplifier. ### Claim 3 (depends on 2) The electronic device of claim 2, wherein the analog front end further comprises: a sample and hold circuit configured to perform a sample and hold operation on a signal output from the filter. ### Claim 4 (depends on 2) The electronic device of claim 2, wherein the amplifier comprises: an inverting input terminal connected to the first electrode; and a non-inverting input terminal connected to the second electrode. ### Claim 5 (depends on 2) The electronic device of claim 2, wherein the amplifier comprises: an inverting input terminal connected to the first electrode; and a non-inverting input terminal connected to a reference potential. ### Claim 6 (depends on 2) The electronic device of claim 2, wherein the second input signal comprises a position signal and a data signal, wherein the driving circuit further comprises a sync controller connected to the analog front end, and wherein the sync controller comprises: a sync data providing circuit configured to provide a sync signal that is inverted to the position signal; an XOR gate connected to the analog front end and the sync data providing circuit, the XOR gate being configured to perform a XOR operation based on the position signal and the sync signal; and a sync determining circuit configured to determine a synchronization state of the second input signal, based on a result of the XOR operation. ### Claim 7 (depends on 1) The electronic device of claim 1, wherein the driving circuit comprises: a first analog front end configured to receive the first input signal; a second analog front end configured to receive the second input signal; and a switching circuit configured to select one of the first analog front end and the second analog front end. ### Claim 8 (depends on 1) The electronic device of claim 1, wherein the first current in the signal profile has a negative value, and the second current in the signal profile has a positive value, and wherein the driving circuit is configured to calculate the coordinates of the input device based on a zero-crossing value of the signal profile. ### Claim 9 (depends on 1) The electronic device of claim 1, wherein the driving circuit is configured to: calculate a first signal profile by changing a sign of a portion of the signal profile; calculate a second signal profile by rotating the first signal profile, such that the second signal profile is symmetrical to the first signal profile about a first axis; and calculate the coordinates of the input device, based on a peak value of the second signal profile. ### Claim 10 (depends on 9) The electronic device of claim 9, wherein the driving circuit is configured to: calculate a plurality of signal profiles; calculate a superimposed signal profile by adding the plurality of signal profiles; change a sign in the superimposed signal profile; and calculate the coordinates of the input device, based on a peak value of a value symmetrical about the first axis. ### Claim 11 (depends on 1) The electronic device of claim 1, wherein the plurality of electrodes further comprise: a third electrode interposed between the first electrode and the second electrode; and a fourth electrode interposed between the first electrode and the third electrode, and wherein the driving circuit is configured to: calculate a first differential signal profile measured based on the first electrode and the third electrode; and calculate the coordinates of the input device, based on a zero-crossing value of the first differential signal profile. ### Claim 12 (depends on 11) The electronic device of claim 11, wherein the driving circuit is configured to: calculate a second differential signal profile by changing a sign of a portion of the first differential signal profile; and calculate the coordinates of the input device, based on a peak value of the second differential signal profile. ### Claim 13 (depends on 11) The electronic device of claim 11, wherein the driving circuit is configured to: calculate a fourth differential signal profile measured based on the third electrode and the fourth electrode; and calculate the coordinates of the input device, based on a peak value of the fourth differential signal profile. ### Claim 14 (depends on 13) The electronic device of claim 13, wherein the driving circuit is configured to: calculate a fifth differential signal profile by changing a sign of a portion of the fourth differential signal profile; and calculate the coordinates of the input device, based on a zero-crossing value of the fifth differential signal profile. ### Claim 15 An electronic device comprising: a display layer; a sensor layer on the display layer, the sensor layer being configured to operate in a first touch mode to sense a first input signal based on a capacitance change, and a second touch mode to sense a second input signal of an input device configured to discharge a magnetic field; and a driving circuit electrically connected to the sensor layer to control an operation of the sensor layer, wherein the driving circuit comprises: an analog front end configured to convert an analog signal of the second input signal into a digital signal; and a sync controller connected to the analog front end, the sync controller comprising: a sync data providing circuit configured to provide a sync signal that is inverted to a position signal of the second input signal; an XOR gate connected to the analog front end and the sync data providing circuit, the XOR gate configured to perform a XOR operation based on the position signal and the sync signal; and a sync determining circuit configured to determine a synchronization state of the second input signal, based on a result of the XOR operation. ### Claim 16 (depends on 15) The electronic device of claim 15, wherein the sensor layer comprises: a plurality of electrodes comprising: a first electrode; and a second electrode adjacent to the first electrode; and a plurality of crossing electrodes, and wherein the driving circuit is configured to sense coordinates of the input device based on a signal profile, the signal profile being measured based on a first current having a first current direction formed in the first electrode by the input device, and a second current having a second current direction opposite to the first current direction formed in the second electrode by the input device. ### Claim 17 (depends on 16) The electronic device of claim 16, wherein the first current in the signal profile has a negative value, and the second current in the signal profile has a positive value, and wherein the driving circuit is configured to calculate the coordinates of the input device, based on a zero-crossing value of the signal profile. ### Claim 18 (depends on 16) The electronic device of claim 16, wherein the driving circuit is configured to: calculate a first signal profile by converting a sign of a portion of the signal profile; calculate a second signal profile by rotating the first signal profile, such that the second signal profile is symmetrical to the first signal profile about a first axis; and calculate the coordinates of the input device, based on a peak value of the second signal profile. ### Claim 19 (depends on 16) The electronic device of claim 16, wherein the plurality of electrodes further comprise: a third electrode interposed between the first electrode and the second electrode; and a fourth electrode interposed between the first electrode and the third electrode, wherein the driving circuit is configured to calculate a first differential signal profile measured based on the first electrode and the third electrode, wherein the driving circuit is configured to calculate a second differential signal profile by changing a sign of a portion of the first differential signal profile, and wherein the driving circuit is configured to calculate the coordinates of the input device, based on a zero-crossing value of the first differential signal profile, or a peak value of the second differential signal profile. ### Claim 20 (depends on 16) The electronic device of claim 16, wherein the plurality of electrodes further comprise: a third electrode interposed between the first electrode and the second electrode, and a fourth electrode interposed between the first electrode and the third electrode, wherein the driving circuit is configured to calculate a fourth differential signal profile measured based on the third electrode and the fourth electrode, wherein the driving circuit is configured to calculate a fifth differential signal profile by changing a sign of a portion of the fourth differential signal profile, and wherein the driving circuit is configured to calculate the coordinates of the input device based on a peak value of the fourth differential signal profile, or a zero-crossing value of the fifth differential signal profile.