# US 2017/0255335 A1 · Light Sensor Input For Controlling Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0255335 A1 - Document ID: US20170255335A1 - Status: Published application - Kind: A1 - Application number: 14/915,696 - Filed: 2015-10-27 - Published: 2017-09-07 - Earliest claimed: 2015-10-27 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Guoqiang ZHANG; Lars ANDERSSON; José ARAÚJO - Web page: https://patentgrep.com/patent/US20170255335A1 ## CPC - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen} - G06F 3/0425: {using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386)} - G06F 3/0488: using a touch-screen or digitiser, e.g. input of commands through traced gestures - G06F 3/04883: for inputting data by handwriting, e.g. gesture or text - G06F 2203/04806: Zoom, i.e. interaction techniques or interactors for controlling the zooming operation - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A device comprising a light sensor, a touchscreen and a processing unit is disclosed. The processing unit is configured to receive a first input signal from the touchscreen and a second input signal from the light sensor, generate an output signal based on the first and second input signals, wherein the processing unit is further configured to process the second input signal only after it has received the first input signal. ## Claims ### Claim 1 A device comprising a light sensor, a touchscreen and a processing unit, wherein the processing unit is configured to; receive a first input signal from the touchscreen and a second input signal from the light sensor, generate an output signal based on the first and second input signals, and process the second input signal only after it has received the first input signal. ### Claim 2 (depends on 1) The device according to claim 1, wherein the processing unit is further configured to request an input signal from the light sensor only after it has received the first input signal, and in response, to receive the input signal from the light sensor and then to process said second input signal. ### Claim 3 (depends on 1) The device according to claim 1, wherein the light sensor is configured to repeatedly send the second input signal to the processing unit, and the processing unit being further configured to only process the second input signal after it has received the first input signal. ### Claim 4 (depends on 1) The device according to claim 1, wherein the second input signal comprises information of light detected by the light sensor, and the processing unit is configured to compare the information with predetermined information, and if the comparison indicates that the light sensor is deemed obscured, the processing unit is further configured to generate an output signal based on the first and second input signals. ### Claim 5 (depends on 1) The device according to claim 1, further comprising another light sensor, and the processing unit is configured to process a third signal from the other light sensor after it has received the first input signal, and to generate an output signal based on the first, second and third signals. ### Claim 6 (depends on 5) The device according to claim 5, wherein the second and third input signals each comprises information of light detected by respective light sensor, and the processing unit is configured to compare the information, and if the information of the second and third signals differ more than a predetermined level, the processing unit is further configured to generate said output signal. ### Claim 7 (depends on 1) The device according to claim 1, wherein the output signal is different to an output signal where the light sensor is not determined to be obscured. ### Claim 8 (depends on 1) The device according to claim 1, wherein the device is a smart phone or a tablet. ### Claim 9 A device comprising a light sensor, a touchscreen, a processor and a memory, said memory containing instructions that when executed cause the processor to: receive a first input signal from the touchscreen and a second input signal from the light sensor, process the first and the second signals, and generate an output signal based on the first and second input signals, wherein the device is configured such that the processor processes the second input signal only after the processor has received the first input signal. ### Claim 10 A method performed by a device comprising a light sensor, a touchscreen and a processing unit, wherein the method comprises the processing unit: receiving a first input signal from the touchscreen and a second input signal from the light sensor, and generating an output signal based on the first and second input signals, wherein the processing unit processes the second input signal only after it has received the first input signal. ### Claim 11 (depends on 10) The method according to claim 10, further comprising the processing unit requesting an input signal from the light sensor only after it has received the first input signal, and in response, receiving the input signal from the light sensor and then processing said second input signal. ### Claim 12 (depends on 10) The method according to claim 10, further comprising the light sensor repeatedly sending the second input signal to the processing unit, and the processing unit only processing the second input signal after it has received the first input ### Claim 13 (depends on 10) A computer program product comprising a non-transitory computer-readable medium storing instructions, which when executed by computer logic, causes said computer logic to carry out the method of claim 10. ### Claim 14 (canceled) ### Claim 15 (cancelled)