# US 11,308,306 B2 · Control method for optical fingerprint sensor and related control circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,308,306 B2 - Document ID: US11308306B2 - Status: Granted - Kind: B2 - Application number: 17/107,962 - Filed: 2020-12-01 - Published: 2021-03-18 - Granted: 2022-04-19 - Earliest claimed: 2015-08-19 - Assignees: Novatek Microelectronics Corp. - Applicants: NOVATEK Microelectronics Corp. - Inventors: Tsen-Wei Chang; Chih-Peng Hsia; Wei-Lun Shih; Hong-Chu Chen; Su-Wei Lien; Sheng-Wen Hsiao; Liang-Chi Cheng - Web page: https://patentgrep.com/patent/US11308306B2 ## CPC - 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 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally} - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G09G 2300/023: Display panel composed of stacked panels - G09G 2310/0264: Details of driving circuits - G09G 2354/00: Aspects of interface with display user - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - 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 A control method for an optical fingerprint sensor and a touch controller are provided for canceling or reducing capacitive loading. The optical fingerprint sensor includes a plurality of pixels, and each of the pixels has a first control signal line and a second control signal line. Each of the pixels is further coupled to a first voltage source line, a second voltage source line and a sensing line. The control method includes the step of applying an anti-loading driving (ALD) signal on at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line when the touch controller is in a touch operation period. ## Claims ### Claim 1 A control method for an optical fingerprint sensor and a touch controller, the optical fingerprint sensor comprising a plurality of pixels, each of the pixels having a first control signal line and a second control signal line, each of the pixels further coupled to a first voltage source line, a second voltage source line and a sensing line, the control method comprising: applying an anti-loading driving (ALD) signal on at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line when the touch controller is in a touch operation period. ### Claim 2 (depends on 1) The control method of claim 1, wherein the ALD signal is applied during an exposure period of the optical fingerprint sensor. ### Claim 3 (depends on 1) The control method of claim 1, wherein any line among the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line not applied with the ALD signal is configured to be floating. ### Claim 4 (depends on 1) The control method of claim 1, wherein a control circuit of the optical fingerprint sensor and the touch controller are integrated with a display driver, and the ALD signal comprises a pulse having a frequency and a phase substantially identical to a frequency and a phase of a touch signal of the touch controller, respectively. ### Claim 5 (depends on 4) The control method of claim 4, wherein an amplitude of the ALD signal is substantially identical to an amplitude of the touch signal. ### Claim 6 A control method for an optical fingerprint sensor and a touch controller, the optical fingerprint sensor comprising a plurality of pixels, each of the pixels having a first control signal line and a second control signal line, each of the pixels further coupled to a first voltage source line, a second voltage source line and a sensing line, the control method comprising: configuring all of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line to be floating when the touch controller is in a touch operation period. ### Claim 7 A control circuit for controlling an optical fingerprint sensor, the optical fingerprint sensor comprising a plurality of pixels, each of the pixels having a first control signal line and a second control signal line, each of the pixels further coupled to a first voltage source line, a second voltage source line and a sensing line, the control circuit being integrated with a touch controller to perform the following step: applying an anti-loading driving (ALD) signal on at least one of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line when the touch controller is in a touch operation period. ### Claim 8 (depends on 7) The control circuit of claim 7, wherein the control circuit is configured to apply the ALD signal during an exposure period of the optical fingerprint sensor. ### Claim 9 (depends on 7) The control circuit of claim 7, wherein any line among the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line not applied with the ALD signal is configured to be floating. ### Claim 10 (depends on 7) The control circuit of claim 7, wherein the second control signal line is coupled to a first terminal of a storage capacitor of the corresponding pixel among the plurality of pixels. ### Claim 11 (depends on 10) The control circuit of claim 10, wherein a second terminal of the storage capacitor is coupled to a first transistor and a second transistor of the corresponding pixel. ### Claim 12 (depends on 11) The control circuit of claim 11, wherein the first transistor is further coupled to the first control signal line and the first voltage source line. ### Claim 13 (depends on 11) The control circuit of claim 11, wherein the second transistor is further coupled to the second voltage source line. ### Claim 14 (depends on 11) The control circuit of claim 11, wherein the second transistor is further coupled to the sensing line through a third transistor. ### Claim 15 (depends on 10) The control circuit of claim 10, wherein the storage capacitor is coupled to an optoelectronic element. ### Claim 16 (depends on 7) The control circuit of claim 7, wherein the optical fingerprint sensor is in an exposure period. ### Claim 17 (depends on 7) The control circuit of claim 7, wherein the control circuit, the touch controller and a display driver are integrated with each other, and the ALD signal comprises a pulse having a frequency and a phase substantially identical to a frequency and a phase of a touch signal of the touch controller, respectively. ### Claim 18 (depends on 17) The control circuit of claim 17, wherein an amplitude of the ALD signal is substantially identical to an amplitude of the touch signal. ### Claim 19 (depends on 7) The control circuit of claim 7, wherein the control circuit is integrated with the touch controller, and the control circuit is configured to apply the ALD signal according to a notification received from the touch controller. ### Claim 20 A control circuit for controlling an optical fingerprint sensor, the optical fingerprint sensor comprising a plurality of pixels, each of the pixels having a first control signal line and a second control signal line, each of the pixels further coupled to a first voltage source line, a second voltage source line and a sensing line, the control circuit being integrated with a touch controller to perform the following step: configuring all of the first control signal line, the second control signal line, the first voltage source line, the second voltage source line and the sensing line to be floating when the touch controller is in a touch operation period.