# US 2014/0192025 A1 · Touchscreen displays incorporating dynamic transmitters > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192025 A1 - Document ID: US20140192025A1 - Status: Published application - Kind: A1 - Application number: 14/202,885 - Filed: 2014-03-10 - Published: 2014-07-10 - Earliest claimed: 2011-02-25 - Inventors: Jonathan Payne - Web page: https://patentgrep.com/patent/US20140192025A1 ## CPC - G06F 3/0423: {using sweeping light beams, e.g. using rotating or vibrating mirror} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Systems and methods for implementing touchscreen displays that utilize a transmitter system to dynamically scan at least one light beam across a surface of interest such that substantially every point in a region above the surface of interest is dynamically scanned by a light beam from two directions, a receiver system to receive and detect the at least one dynamically scanned light beams, and a processor configured to determine locations of contact are provided. The systems and methods may utilize a transmitter system that includes dynamic transmitters, which may be in the form MEMS micromirrors used in conjunction with infrared semiconductor lasers. ## Claims ### Claim 1 A touchscreen display comprising: a transmitter system that dynamically scans at least one light beam above a surface such that substantially every point in a region above the surface is dynamically scanned by a light beam from at least two directions, where the region that is inclusive of substantially every point above the surface that is scanned by a light beam from at least two directions defines a surface of interest within which the presence of a contacting member that intercepts the light beam can be detected, and where the angular position of the at least one light beam is a function of at least one angular position signal; a receiver system comprising a light distributing sensor that bounds the surface of interest along at least one edge, and is external to the surface of interest, the light distributing sensor including a photosensor, where light incident on the light distributing sensor is redirected away from the surface of interest and is guided within the light distributing sensor to the photosensor, which detects the presence of light incident on the light distributing sensor; and a processor; wherein the receiver system is configured to signal the detection of light by the photosensor to the processor; wherein the processor is configured to determine the presence of a contacting member using the signal provided by the receiver system; wherein the processor is configured to determine the angular position of the at least one light beam at a point in time when a contacting member is present using the at least one angular position signal; and wherein the processor is configured to triangulate the location of a contact point using at least the determined angular position of the at least one light beam at the point in time at which the contacting member was present. ### Claim 2 (depends on 1) The touchscreen display of claim 1, wherein the transmitter system comprises a single dynamic transmitter. ### Claim 3 (depends on 2) The touchscreen display of claim 2, wherein the single dynamic transmitter comprises a MEMS micromirror used in conjunction with at least two sources of light. ### Claim 4 (depends on 3) The touchscreen display of claim 3, wherein at least one of the at least two sources of light is an infrared semiconductor laser. ### Claim 5 (depends on 2) The touchscreen display of claim 2, wherein the transmitter system is configured to signal the angular position of the single dynamic transmitter to the processor. ### Claim 6 (depends on 1) The touchscreen display of claim 1, wherein the transmitter system comprises at least two dynamic transmitters, and wherein the angular position of a first of the at least two dynamic transmitters is a function of a first angular position signal and the angular position of a second of the at least two dynamic transmitters is a function of a second angular position signal. ### Claim 7 (depends on 6) The touchscreen display of claim 6, wherein at least one of the dynamic transmitters is in the form of a MEMS micromirror used in conjunction with at least one source of light. ### Claim 8 (depends on 7) The touchscreen display of claim 7, wherein the at least one source of light is an infrared semiconductor laser. ### Claim 9 (depends on 1) The touchscreen display of claim 1, wherein the transmitter system comprises a MEMS micromirror that is configured to reflect at least one scanned light beam across the surface of interest. ### Claim 10 (depends on 9) The touchscreen display of claim 9, wherein the MEMS micromirror is configured to rotate through an angle in an oscillatory fashion. ### Claim 11 (depends on 10) The touchscreen display of claim 10, wherein an applied voltage controls the rotation of the MEMS micromirror through an angle in an oscillatory fashion, the applied voltage being correlated with the angular position of the MEMS micromirror. ### Claim 12 (depends on 1) The touchscreen display of claim 1, wherein the transmitter system scans at least one light beam in a direction not parallel to the surface of interest. ### Claim 13 (depends on 1) The touchscreen display of claim 1, wherein the at least one light beam is scanned through a transmissive body. ### Claim 14 (depends on 1) The touchscreen display of claim 1, wherein the at least one light beam is scanned so as to approximate the emission of a Cartesian-type grid of light beams using a system of folding mirrors and optical strips. ### Claim 15 (depends on 14) The touchscreen display of claim 14, wherein the approximation of the emission of a Cartesian-type grid of light beams is achieved using a single MEMS micromirror in conjunction with a single source of light, and a system of folding mirrors and optical strips. ### Claim 16 A method of triangulating a contact point incident on a surface of interest comprising: dynamically scanning at least one light beam above a surface such that substantially every point in a region above the surface is dynamically scanned by a light beam from at least two directions, where the region that is inclusive of substantially every point above the surface that is scanned by a light beam from at least two directions defines a surface of interest within which the presence of a contacting member that intercepts the light beam can be detected; generating at least one angular position signal such that the angular position of the at least one light beam that is scanned is a function of the at least one angular position signal; detecting the at least one light beam using a receiver system comprising a light distributing sensor that bounds the surface of interest along at least one edge, and is external to the surface of interest, the light distributing sensor including a photosensor, where light incident on the light distributing sensor is redirected away from the surface of interest and is guided within the light distributing sensor to the photosensor, which detects the presence of light incident on the light distributing sensor; signaling the detection of the at least one light beam; determining the presence of a contacting member by evaluating whether the signaling of the detection of the at least one light beam indicates a disturbance in the regular detection of light; determining the angular position of the at least one light beam at a point in time when a contacting member is present using the at least one angular position signal; and triangulating the location of the contact point using at least the determined angular position of the at least one light beam at the point in time at which the contacting member was present, using a processor. ### Claim 17 (depends on 16) The method of claim 16, wherein: at least two light beams are dynamically scanned above the surface of interest; and the light beams are scanned such that none of the light beams are ever simultaneously incident on any single light distributing sensor. ### Claim 18 (depends on 17) The method of claim 17, wherein: at least one dynamic transmitter is used to dynamically scan at least one light beam above the surface of interest such that substantially every point in a region above the surface of interest is dynamically scanned by a light beam from at least two directions; and the at least one dynamic transmitter is intermittently powered off such that none of the light beams are ever simultaneously incident on any single receiving element. ### Claim 19 (depends on 16) The method of claim 16, further comprising: synchronizing the dynamic scanning of the at least one beam and the detection of the at least one beam to a reference clock signal; wherein the processor determines the contact point based upon the timing of interruptions of the detection of the at least one dynamically scanned light beam. ### Claim 20 A touchscreen display comprising: a surface; a processor; two dynamic transmitters, each of which comprises a MEMS micromirror and an infrared semiconductor laser; wherein each dynamic transmitter is configured such that its respective MEMS micromirror is able to redirect light from the respective infrared semiconductor laser across the surface, while the MEMS micromirror is rotating in an oscillatory fashion with an angular position that is a function of an angular position signal, thereby dynamically scanning a light beam across the surface, such that substantially every point in a region above the surface is dynamically scanned by a light beam from at least two directions, where the region that is inclusive of substantially every point above the surface that is scanned by a light beam from at least two directions defines a surface of interest within which the presence of a contacting member that intercepts the light beams can be detected; a light distributing sensor that bounds the surface of interest along at least one edge, and is external to the surface of interest, the light distributing sensor including a photosensor, where light incident on the light distributing sensor is redirected away from the surface of interest and is guided within the light distributing sensor to the photosensor, which detects the presence of light incident on the light distributing sensor; a light distributing sensor that bounds the surface of interest along at least one edge, and is external to the surface of interest, the light distributing sensor including a photosensor, where light incident on the light distributing sensor is redirected away from the surface of interest and is guided within the light distributing sensor to the photosensor, which detects the presence of light incident on the light distributing sensor; wherein the photosensor signals the detection of light incident on the light distributing sensor to the processor; wherein the processor is configured to determine the presence of a contacting member by evaluating whether the signal provided by the photosensor indicates a disturbance in the regular detection of light; wherein the processor is configured to determine the angular position of each of the two dynamic transmitters when a contacting member is present using the respective angular position signals of the respective MEMS micromirrors within the respective dynamic transmitters; and wherein the processor is configured to triangulate the location of the contact point using at least the determined angular position of each of the two dynamic transmitters at the point in time at which the contacting member was present.