# US 2021/0240220 A1 · Electronic device which can detect touch state > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0240220 A1 - Document ID: US20210240220A1 - Status: Published application - Kind: A1 - Application number: 17/233,523 - Filed: 2021-04-18 - Published: 2021-08-05 - Earliest claimed: 2020-01-21 - Assignees: Pixart Imaging Inc. - Applicants: PixArt Imaging Inc. - Inventors: Ming-Hung Tsai; Tse-Chung Su; Ren-Hau Gu; Tzung-Min Su - Web page: https://patentgrep.com/patent/US20210240220A1 ## CPC - G06F 1/163: {Wearable computers, e.g. on a belt} - G04G 21/025: {for measuring physiological data} - G04G 21/08: Touch switches specially adapted for time-pieces - G06F 1/1684: {Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675} - G06F 1/3231: Monitoring the presence, absence or movement of users - G06F 3/0304: {Detection arrangements using opto-electronic means (constructional details of pointing devices not related to the detection arrangement using opto-electronic means G06F3/033; optical digitisers G06F3/042)} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/044: by capacitive means - G06F 21/316: {by observing the pattern of computer usage, e.g. typical user behaviour} - G06Q 20/321: {using wearable devices} - G06Q 20/401: {Transaction verification} - Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G04G: ELECTRONIC TIME-PIECES - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract An electronic device which can detect a touch state, comprising: a front surface for showing images; at least one first electrode, provided in a first region; at least one second electrode, provided in a second region, wherein a distance between the first region and the front surface is larger than a distance between the second region and the front surface; a capacitance calculating circuit, configured to calculate at least one first capacitance generated by the first electrode and coupled to the second electrode to calculate at least one second capacitance generated by the second electrode, wherein the capacitance calculating circuit further calculates a capacitance difference between the first capacitance and the second capacitance; and a processing circuit, configured to determine the touch state according to the capacitance difference. Via such structure, the touch state of the electronic device can be precisely acquired. ## Claims ### Claim 1 An electronic device with a function of detecting a touch state, comprising: a front surface, configured to show images; at least one first electrode, provided in a first region of the electronic device; at least one second electrode, provided in a second region of the electronic device, wherein a distance between the first region and the front surface is larger than a distance between the second region and the front surface; a capacitance calculating circuit, coupled to the first electrode to calculate at least one first capacitance generated by the first electrode and coupled to the second electrode to calculate at least one second capacitance generated by the second electrode, wherein the capacitance calculating circuit further calculates a capacitance difference between the first capacitance and the second capacitance; and a processing circuit, coupled to the capacitance calculating circuit, configured to determine the touch state according to the capacitance difference. ### Claim 2 (depends on 1) The electronic device of claim 1, wherein the electronic device comprises an inner region serving as the first region and an outer region serving as the second region. ### Claim 3 (depends on 2) The electronic device of claim 2, wherein the outer region is surrounding the inner region. ### Claim 4 (depends on 2) The electronic device of claim 2, wherein the inner region is provided to a first part of the electronic device and the outer region is provided to a second part of the electronic device, wherein the inner region and the outer region are provided to a first surface of the electronic device, wherein the first part is more protruding than the front surface of the electronic device, wherein the front surface is opposite to the first surface. ### Claim 5 (depends on 1) The electronic device of claim 1, further comprising: at least two light sources and at least one optical sensor, wherein the optical sensor senses light generated from the light sources to respectively generate light sensing signals; wherein the capacitance calculating circuit further calculates a first capacitance variation based on the first capacitance and a second capacitance variation based on the second capacitance; wherein the processing circuit further determines which one of the light sensing signals is reliable according to the first capacitance variation or the second capacitance variation. ### Claim 6 (depends on 1) The electronic device of claim 1, wherein at least one of the first electrode serves as at least one transmitter and at least one of the first electrode serves as at least one receiver, wherein the processing circuit further calculates biological information according to signals flowing between the transmitter and the receiver.