# US 10,121,447 B2 · Optimized screen brightness control using multi-point light intensity input > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,447 B2 - Document ID: US10121447B2 - Status: Granted - Kind: B2 - Application number: 15/787,048 - Filed: 2017-10-18 - Published: 2018-02-08 - Granted: 2018-11-06 - Earliest claimed: 2015-08-05 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Rahul Ghosh; William R. LaRiccia; Ravi K. Muthukrishnan; Aaron J. Quirk; Xianjun Zhu - Web page: https://patentgrep.com/patent/US10121447B2 ## CPC - G09G 5/003: {Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto (specific for a CRT G09G1/165; for a flat panel G09G3/2092)} - G09G 2320/0626: for control of overall brightness - G09G 2360/144: the light being ambient light - 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 This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for controlling a display screen brightness level for an electronic device. In one embodiment, the electronic device determines a first ambient light level and associates the first ambient light level with a first priority weight value. The electronic device further determines a second ambient light level and associates the second ambient light level with a second priority weight value. A display controller within the electronic device sets the display screen brightness level based, at least in part, on the first ambient light level, the second ambient light level, and at least one of the first and second priority weight values. ## Claims ### Claim 1 A method performed by a first device for controlling a display screen brightness level, the method comprising: determining a first ambient light level at a first light sensor of the first device; determining a second ambient light level at a second light sensor of a second device that is different from the first device; and setting the display screen brightness level of a display in the first device based, at least in part, on the first ambient light level and the second ambient light level. ### Claim 2 (depends on 1) The method of claim 1, wherein the second device is a wearable device that is associated with the first device. ### Claim 3 (depends on 2) The method of claim 2, wherein the first device is a handheld mobile device that is communicatively coupled with the wearable device. ### Claim 4 (depends on 1) The method of claim 1, wherein said setting the display screen brightness level comprises: determining a normalization baseline for at least one of the first and second ambient light levels; and normalizing at least one of the first and second ambient light levels based on the normalization baseline. ### Claim 5 (depends on 1) The method of claim 1, wherein the first ambient light level is associated with a first priority weight value, wherein the second ambient light level is associated with a second priority weight value, and wherein the display screen brightness level is further based, at least in part, on the first and second priority weight values. ### Claim 6 (depends on 5) The method of claim 5, wherein said setting the display screen brightness level comprises: generating an aggregate ambient light level value based on the first and second ambient light levels and the first and second priority weight values; and sending the aggregate ambient light level value to a display feedback controller within the first device. ### Claim 7 (depends on 5) The method of claim 5, wherein said setting the display screen brightness level comprises: comparing the first and second ambient light levels; and adjusting the second priority weight value in response to determining that the second ambient light level exceeds the first ambient light level by a threshold amount. ### Claim 8 (depends on 7) The method of claim 7, wherein said adjusting the second priority weight value comprises increasing the second priority weight value in proportion to a difference between the first and second ambient light levels. ### Claim 9 (depends on 1) The method of claim 1, wherein the first device is communicatively coupled with the second device, and wherein said determining the second ambient light level comprises receiving from the second device, the second ambient light level detected by the second light sensor. ### Claim 10 (depends on 1) The method of claim 1, further comprising: determining a third ambient light level at a third light sensor of a third device that is different from the first device; and setting the display screen brightness level of the display in the first device based, at least in part, on the first ambient light level, the second ambient light level, and the third ambient light level. ### Claim 11 A wearable device, comprising: a light sensor; a processor; and memory storing instructions which, when executed by the processor, cause the wearable device to: detect an ambient light level at the light sensor of the wearable device; and cause a first device to adjust a display screen brightness level of a display integrated into the first device based, at least in part, on the ambient light level at the light sensor of the wearable device, wherein the first device is separate from the wearable device. ### Claim 12 (depends on 11) The wearable device of claim 11, further comprising: a short-range radio frequency communication interface configured to communicate with the first device, wherein the instructions to cause the first device to adjust the display screen brightness level include instructions which, when executed by the processor, cause the wearable device to: send an indication of the ambient light level to the first device via the short-range radio frequency communication interface of the wearable device. ### Claim 13 (depends on 11) The wearable device of claim 11, wherein a form factor of the wearable device is designed such that the wearable device can be fastened to, adhered to, hung onto, or attached to an article of clothing. ### Claim 14 (depends on 11) The wearable device of claim 11, wherein a form factor of the wearable device is designed such that the wearable device can be worn on a face, wrist, ankle, or ear of a body. ### Claim 15 (depends on 11) The wearable device of claim 11, wherein the wearable device is an accessory that is communicatively coupled to the first device. ### Claim 16 A method performed by a wearable device, the method comprising: detecting an ambient light level at a light sensor of the wearable device; and causing, by the wearable device, a first device to adjust a display screen brightness level of a display in the first device based, at least in part, on the ambient light level at the light sensor of the wearable device, wherein the first device is separate from the wearable device. ### Claim 17 (depends on 16) The method of claim 16, wherein causing the first device to adjust the display screen brightness level comprises: sending an indication of the ambient light level to the first device via a communication interface of the wearable device. ### Claim 18 (depends on 17) The method of claim 17, wherein the communication interface comprises a short-range radio-frequency wireless communication interface. ### Claim 19 (depends on 16) The method of claim 16, wherein a design of the wearable device is such that the light sensor of the wearable device is positioned to detect the ambient light level of light originating from behind or sides of the first device when the display of the first device is facing a user. ### Claim 20 (depends on 16) The method of claim 16, wherein the wearable device comprises eyeglasses or a wristband.