# US 12,217,690 B2 · Under-display sensor operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,690 B2 - Document ID: US12217690B2 - Status: Granted - Kind: B2 - Application number: 18/553,136 - Filed: 2021-08-09 - Published: 2024-06-06 - Granted: 2025-02-04 - Earliest claimed: 2021-08-09 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Sangmoo Choi - Web page: https://patentgrep.com/patent/US12217690B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2320/0626: for control of overall brightness - G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours - G09G 2354/00: Aspects of interface with display user - 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) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract An example device includes a display panel; a fingerprint sensor configured to sense a fingerprint through the display panel; and processing circuitry configured to: responsive to activation of the fingerprint sensor: activate a local high brightness mode by at least increasing an amount of light radiated from a first portion of the display panel that overlies the fingerprint sensor; and temporarily decrease controlled brightness of a second portion of the display panel that is non-overlapping with the first portion. ## Claims ### Claim 1 A device comprising: a display panel; a fingerprint sensor configured to sense a fingerprint through the display panel; and processing circuitry configured to: responsive to activation of the fingerprint sensor: activate a local high brightness mode by at least increasing an amount of light radiated from a first portion of the display panel that overlies the fingerprint sensor; and temporarily decrease controlled brightness of a second portion of the display panel that is non-overlapping with the first portion. ### Claim 2 (depends on 1) The device of claim 1, wherein: the processing circuitry is configured to operate, prior to activation of the fingerprint sensor, the second portion of the display panel at a first brightness level, to temporarily decrease the controlled brightness of the second portion of the display panel, the processing circuitry is configured to: decrease, for a first period of time, the controlled brightness of the second portion of the display panel to a second brightness level that is less than the first brightness level, and increase, after the first period of time and while the local high brightness mode remains activated, the controlled brightness of the second portion of the display panel to the first brightness level. ### Claim 3 (depends on 2) The device of claim 2, wherein the processing circuitry is further configured to: temporarily increase, responsive to deactivation of the local high brightness mode, the controlled brightness of the second portion of the display panel. ### Claim 4 (depends on 3) The device of claim 3, wherein: to temporarily increase the controlled brightness of the second portion of the display panel, the processing circuitry is configured to: increase, for a second period of time, the controlled brightness of the second portion of the display panel to a third brightness level that is greater than the first brightness level, and decrease, after the second period of time, the controlled brightness of the second portion of the display panel to the first brightness level. ### Claim 5 (depends on 3) The device of claim 3, wherein to temporarily increase the controlled brightness of the second portion of the display panel, the processing circuitry is configured to increase the controlled brightness of the second portion of the display panel for n frames. ### Claim 6 (depends on 1) The device of claim 1, wherein to temporarily decrease the controlled brightness of the second portion of the display panel, the processing circuitry is configured to decrease the controlled brightness of the second portion of the display panel for n frames. ### Claim 7 (depends on 1) The device of claim 1, wherein, to decrease the controlled brightness of the second portion of the display panel, the processing circuitry is configured to decrease a programmed brightness level of the second portion of the display panel, and wherein, to increase the controlled brightness of the second portion of the display panel, the processing circuitry is configured to increase the programmed brightness level of the second portion of the display panel. ### Claim 8 (depends on 1) The device of claim 1, wherein, to decrease the controlled brightness of the second portion of the display panel, the processing circuitry is configured to decrease an emission duty ratio of the second portion of the display panel, and wherein, to increase the controlled brightness of the second portion of the display panel, the processing circuitry is configured to increase the emission duty ratio of the second portion of the display panel. ### Claim 9 (depends on 1) The device of claim 1, wherein, to activate the local high brightness mode and temporarily decrease the brightness of the second portion of the display panel, the processing circuitry is configured to: activate the local high brightness mode and temporarily decrease the controlled brightness of the second portion of the display panel responsive to: activation of the fingerprint sensor; and determining that, prior to activation of the fingerprint sensor, the controlled brightness of the second portion of the display panel is less than a brightness threshold. ### Claim 10 (depends on 9) The device of claim 9, wherein, to determine that the controlled brightness of the second portion of the display panel is less than the brightness threshold, the processing circuitry is configured to: determine that, prior to activation of the fingerprint sensor, the processing circuitry is controlling brightness of the display panel using pulse width modulation (PWM). ### Claim 11 (depends on 1) The device of claim 1, wherein the display comprises an organic light-emitting diode display (OLED). ### Claim 12 A method comprising: responsive to activation of a fingerprint sensor that is configured to sense a fingerprint through a display panel: activating a local high brightness mode by at least increasing an amount of light radiated from a first portion of the display panel that overlies the fingerprint sensor; and temporarily decreasing controlled brightness of a second portion of the display panel that is non-overlapping with the first portion. ### Claim 13 (depends on 12) The method of claim 12, further comprising: operating, prior to activation of the fingerprint sensor, the second portion of the display panel at a first brightness level, wherein temporarily decreasing the brightness of the second portion of the display panel comprises: decreasing, for a first period of time, the controlled brightness of the second portion of the display panel to a second brightness level that is less than the first brightness level, and increasing, after the first period of time and while the local high brightness mode remains activated, the controlled brightness of the second portion of the display panel to the first brightness level. ### Claim 14 (depends on 12) The method of claim 12, further comprising: temporarily increasing, responsive to deactivation of the local high brightness mode, controlled brightness of the second portion of the display panel. ### Claim 15 (depends on 12) The method of claim 12, wherein activating the local high brightness mode and temporarily decreasing the controlled brightness of the second portion of the display panel responsive to activation of the fingerprint sensor comprises: activating the local high brightness mode and temporarily decreasing the controlled brightness of the second portion of the display panel responsive to: activation of the fingerprint sensor; and determining that, prior to activation of the fingerprint sensor, the controlled brightness of the second portion of the display panel is less than a brightness threshold. ### Claim 16 A non-transitory computer-readable storage medium storing instructions that, when executed by a controller of a device, cause the controller to: responsive to activation of a fingerprint sensor of the device that is configured to sense a fingerprint through a display panel of the device: activate a local high brightness mode by at least increasing an amount of light radiated from a first portion of the display panel that overlies the fingerprint sensor; and temporarily decrease controlled brightness of a second portion of the display panel that is non-overlapping with the first portion. ### Claim 17 (depends on 16) The non-transitory computer-readable storage medium of claim 16, further comprising instructions that cause the controller to: temporarily increase, responsive to deactivation of the local high brightness mode, controlled brightness of the second portion of the display panel. ### Claim 18 (depends on 16) The non-transitory computer-readable storage medium of claim 16, wherein the instructions that cause the controller to activate the local high brightness mode and temporarily decrease the controlled brightness of the second portion of the display panel responsive to activation of the fingerprint sensor comprise instructions that cause the controller to: activate the local high brightness mode and temporarily decrease the controlled brightness of the second portion of the display panel responsive to: activation of the fingerprint sensor, and determining that, prior to activation of the fingerprint sensor, the controlled brightness of the second portion of the display panel is less than a brightness threshold. ### Claim 19 (depends on 16) The non-transitory computer-readable storage medium of claim 16, further comprising instructions that cause the controller to: operate, prior to activation of the fingerprint sensor, the second portion of the display panel at a first brightness level, wherein the instructions that cause the controller to temporarily decrease the brightness of the second portion of the display panel comprise instructions that cause the controller to: decrease, for a first period of time, the controlled brightness of the second portion of the display panel to a second brightness level that is less than the first brightness level, and increase, after the first period of time and while the local high brightness mode remains activated, the controlled brightness of the second portion of the display panel to the first brightness level.