# US 12,001,261 B2 · Power optimization for smartwatch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,261 B2 - Document ID: US12001261B2 - Status: Granted - Kind: B2 - Application number: 17/809,169 - Filed: 2022-06-27 - Published: 2023-12-28 - Granted: 2024-06-04 - Earliest claimed: 2022-06-27 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Vishnu Vardhan Kasilya Sudarsan; Jaipal Reddy; Pruthvi Raj Singh; Shilpa Melinamutt - Web page: https://patentgrep.com/patent/US12001261B2 ## CPC - G06F 1/163: {Wearable computers, e.g. on a belt} - G06F 1/3231: Monitoring the presence, absence or movement of users - G04G 21/02: Detectors of external physical values, e.g. temperature - G06F 1/1686: {the I/O peripheral being an integrated camera} - G06F 1/1694: {the I/O peripheral being a single or a set of motion sensors for pointer control or gesture input obtained by sensing movements of the portable computer} - G06F 1/3215: Monitoring of peripheral devices - G06F 1/3265: {Power saving in display device} - G06F 3/017: {Gesture based interaction, e.g. based on a set of recognized hand gestures (interaction based on gestures traced on a digitiser G06F3/04883)} - G06F 3/0346: with detection of the device orientation or free movement in a three-dimensional [3D] space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors - G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints - G06V 40/166: {using acquisition arrangements} - G06V 40/172: {Classification, e.g. identification} - G06F 1/3203: Power management, i.e. event-based initiation of a power-saving mode - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G04G: ELECTRONIC TIME-PIECES - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract Systems and methods for improving power usage of a wireless device are disclosed. The wireless device includes a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: determine a change in ambient light received by the wireless device; determine a position of the wireless device; activate a low power image sensor based on at least one of the change in the ambient light or the position of the wireless device; detect a face using the low power image sensor; and turn on a display of the wireless device based on a user face being the face detected. ## Claims ### Claim 1 A method performed by a wireless device, the method comprising: determining a change in ambient light received by a light sensor of the wireless device; determining positional information of the wireless device using a motion sensor, the positional information including an angle of the wireless device, a rotation of the wireless device, a movement of the wireless device, or a combination thereof; activating, while a display of the wireless device is turned off, a low power image sensor for a face detection process based on at least one of the change in the ambient light or the positional information of the wireless device; and turning on the display of the wireless device based on a detected face from the face detection process by the low power image sensor corresponding to an authorized user face. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining whether the change in the ambient light exceeds a change threshold. ### Claim 3 (depends on 2) The method of claim 2, wherein the change threshold is based on the ambient light being classified as one of low light, indoor or outdoor. ### Claim 4 (depends on 2) The method of claim 2, further comprising: determining whether a position of the wireless device based on the positional information allows for a user of the wireless device to view the display. ### Claim 5 (depends on 4) The method of claim 4, wherein the low power image sensor is activated when the change in the ambient light exceeds the change threshold and the position of the wireless device allows for the user to view the display. ### Claim 6 (depends on 4) The method of claim 4, wherein the position of the wireless device allows for the user to view the display, when the wireless device is at a chest level of the user. ### Claim 7 (depends on 4) The method of claim 4, wherein the position of the wireless device allows for the user to view the display is dependent on an orientation of the user. ### Claim 8 (depends on 1) The method of claim 1, wherein the face detection process comprises: determination of whether the detected face corresponds to the authorized user face upon the detected face being upright with a tilt less than a face tilt threshold. ### Claim 9 (depends on 8) The method of claim 8, wherein the face tilt threshold is minus fifty degrees to plus fifty degrees, where approximately 0 degrees is an orientation of the detected face being upright. ### Claim 10 (depends on 8) The method of claim 8, wherein the face detection process further comprises: determining that the authorized user face is not detected based on the detected face is determined as being upside down or having a tilt greater than the face tilt threshold, wherein the display is not turned on based on the authorized user face not being detected. ### Claim 11 (depends on 1) The method of claim 1, wherein the determining the position positional information of the wireless device further comprises: measuring the movement and an orientation of the wireless device relative to a user of the wireless device. ### Claim 12 (depends on 11) The method of claim 11, wherein the orientation of the wireless device includes a rotational movement of the wireless device. ### Claim 13 (depends on 11) The method of claim 11, wherein the movement and the orientation of the wireless device is determined relative to the user of the wireless device. ### Claim 14 (depends on 11) The method of claim 11, wherein the movement of the wireless device includes velocity measurements. ### Claim 15 (depends on 1) The method of claim 1, wherein the low power image sensor comprises an image sensor and a low power processor. ### Claim 16 A wireless device, comprising: a memory; a display; a light sensor; a low power image sensor; a motion sensor; and at least one processor communicatively coupled to the memory, the light sensor, the motion sensor and the low power image sensor, the at least one processor configured to: determine a change in ambient light received by the light sensor of the wireless device; determine positional information of the wireless device using the motion sensor, the positional information including an angle of the wireless device, a rotation of the wireless device, a movement of the wireless device, or a combination thereof; activate, while the display of the wireless device is turned off, the low power image sensor for a face detection process based on at least one of the change in the ambient light or the positional information of the wireless device; and turn on the display of the wireless device based on a detected face from the face detection process by the low power image sensor corresponding to an authorized user face. ### Claim 17 (depends on 16) The wireless device of claim 16, wherein the at least one processor is further configured to: determine whether the change in the ambient light exceeds a change threshold. ### Claim 18 (depends on 17) The wireless device of claim 17, wherein the change threshold is based on the ambient light being classified as one of low light, indoor or outdoor. ### Claim 19 (depends on 17) The wireless device of claim 17, wherein the at least one processor is further configured to: determine whether a position of the wireless device based on the positional information allows for a user of the wireless device to view the display. ### Claim 20 (depends on 19) The wireless device of claim 19, wherein the low power image sensor is activated when the change in the ambient light exceeds the change threshold and the position of the wireless device allows for the user to view the display. ### Claim 21 (depends on 19) The wireless device of claim 19, wherein the position of the wireless device allows for the user to view the display, when the wireless device is at a chest level of the user. ### Claim 22 (depends on 19) The wireless device of claim 19, wherein the position of the wireless device that allows for the user to view the display is dependent on an orientation of the user. ### Claim 23 (depends on 16) The wireless device of claim 16, wherein the at least one processor is further configured to: determine whether the detected face corresponds to the authorized user face upon the detected face being upright with a tilt less than a face tilt threshold. ### Claim 24 (depends on 23) The wireless device of claim 23, wherein the face tilt threshold is minus fifty degrees to plus fifty degrees, where approximately 0 degrees is an orientation of the detected face being upright. ### Claim 25 (depends on 23) The wireless device of claim 23, wherein the at least one processor is further configured to: determine that the authorized user face is not detected based on the detected face is determined as being upside down or having a tilt greater than the face tilt threshold, wherein the display is not turned on based on the authorized user face not being detected. ### Claim 26 (depends on 16) The wireless device of claim 16, wherein the at least one processor configured to determine the positioning information of the wireless device is further configured to: measure the movement and an orientation of the wireless device relative to a user of the wireless device. ### Claim 27 (depends on 26) The wireless device of claim 26, wherein the orientation of the wireless device includes a rotational movement of the wireless device. ### Claim 28 (depends on 26) The wireless device of claim 26, wherein the movement and the orientation of the wireless device is determined relative to the user of the wireless device. ### Claim 29 (depends on 26) The wireless device of claim 26, wherein the movement of the wireless device includes velocity measurements. ### Claim 30 (depends on 16) The wireless device of claim 16, wherein the low power image sensor comprises an image sensor and a low power processor. ### Claim 31 A wireless device, comprising: means for determining a change in ambient light received by the wireless device; means for determining positional information of the wireless device, the positional information including an angle of the wireless device, a rotation of the wireless device, a movement of the wireless device, or a combination thereof; means for activating, while a display of the wireless device is turned off, a low power image sensor for a face detection process based on at least one of the change in the ambient light or the positional information of the wireless device; and means for turning on the display of the wireless device based on a detected face from the face detection process by the low power image sensor corresponding to an authorized user face. ### Claim 32 (depends on 31) The wireless device of claim 31, further comprising: means for determining whether the change in the ambient light exceeds a change threshold. ### Claim 33 (depends on 32) The wireless device of claim 32, further comprising: means for determining whether a position of the wireless device based on the positional information allows for a user of the wireless device to view the display. ### Claim 34 (depends on 31) The wireless device of claim 31, further comprising: means for determining whether the detected face is upright with a tilt less than a face tilt threshold. ### Claim 35 (depends on 34) The wireless device of claim 34, wherein the face detection process further comprises: determining that the authorized user face is not detected based on the detected face is determined as being upside down or having a tilt greater than the face tilt threshold, wherein the display is not turned on based on the authorized user face not being detected. ### Claim 36 A non-transitory computer-readable medium configured to store computer-executable instructions that, when executed by a processor of a wireless device, cause the processor to: determine a change in ambient light received by a light sensor of the wireless device; determine positional information of the wireless device using a motion sensor, the positional information including an angle of the wireless device, a rotation of the wireless device, a movement of the wireless device, or a combination thereof; activate, while a display of the wireless device is turned off, a low power image sensor for a face detection process based on at least one of the change in the ambient light or the positional information of the wireless device; and turn on the display of the wireless device based on a detected face from the face detection process by the low power image sensor corresponding to an authorized user face. ### Claim 37 (depends on 36) The non-transitory computer-readable medium of claim 36, further comprising computer-executable instructions that, when executed by the processor, cause the processor to: determine whether the detected face corresponds to the authorized user face upon the detected face being upright with a tilt less than a face tilt threshold. ### Claim 38 (depends on 37) The non-transitory computer-readable medium of claim 37, further comprising computer-executable instructions that, when executed by the processor, cause the processor to: determine that the authorized user face is not detected based on the detected face is determined as being upside down or having a tilt greater than the face tilt threshold, wherein the display is not turned on based on the authorized user face not being detected. ### Claim 39 (depends on 36) The non-transitory computer-readable medium of claim 36, further comprising computer-executable instructions that, when executed by the processor, cause the processor to: measure the movement and an orientation of the wireless device relative to a user of the wireless device. ### Claim 40 (depends on 39) The non-transitory computer-readable medium of claim 39, wherein the orientation of the wireless device includes a rotational movement of the wireless device.