# US 2018/0324331 A1 · Noise cancellation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324331 A1 - Document ID: US20180324331A1 - Status: Published application - Kind: A1 - Application number: 15/711,738 - Filed: 2017-09-21 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Keitaro Yamashita; Ting-Kuo Chang; Cheng-Ho Yu; Warren S. Rieutort-Louis - Web page: https://patentgrep.com/patent/US20180324331A1 ## CPC - H04N 5/213: Circuitry for suppressing or minimising impulsive noise (for suppressing or minimising disturbance in image signal generation H04N23/81) - G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - H04N 5/00: Details of television systems (scanning details or combination thereof with generation of supply voltages H04N3/00) - H04N 25/60: Noise processing, e.g. detecting, correcting, reducing or removing noise - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display - G09G 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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 Electronic devices, storage medium containing instructions, and methods pertain to cancelling noise that results from application of voltages on gates of transistors in a display. One or more compensation or dummy drivers are used to apply a compensation voltage that is an inversion of voltages applied on the gates of the transistors. ## Claims ### Claim 1 A method for driving a display comprising: determining whether a voltage is to be applied to a gate of a transistor of the display; and injecting, into a substrate of the display, a compensation voltage inverse to the voltage to be applied to the transistor. ### Claim 2 (depends on 1) The method of claim 1, wherein injecting the compensation voltage comprises injecting the compensation voltage using a compensation gate driver that is connected to the substrate. ### Claim 3 (depends on 2) The method of claim 2, wherein the compensation gate driver comprises a dummy gate driver that is not used to drive any gate of any transistor. ### Claim 4 (depends on 2) The method of claim 2, comprising: determining whether an additional voltage is to be applied to a gate of an additional transistor of the display; and injecting, into the substrate of the display, an additional compensation voltage inverse to the additional voltage to be applied to the additional transistor using the compensation gate driver. ### Claim 5 (depends on 4) The method of claim 4 comprising: ANDing the voltage with the additional voltage to determine a combined voltage of the voltage and the additional voltage; and inverting the combined voltage. ### Claim 6 (depends on 2) The method of claim 2, comprising: determining whether an additional voltage is to be applied to a gate of an additional transistor of the display; and injecting, into the substrate of the display, an additional compensation voltage inverse to the additional voltage to be applied to the additional transistor using an additional gate driver clock. ### Claim 7 (depends on 1) The method of claim 1 comprising detecting a touch on the display at a touch electrode of the display. ### Claim 8 (depends on 7) The method of claim 7, wherein detecting the touch comprises receiving a compensated signal on the touch electrode that has reduced noise on the touch electrode reduced due to application of the compensation voltage. ### Claim 9 An electronic display comprising: a substrate; a touch electrode configured to detect touch on the electronic display; pixel circuitry coupled to the substrate; a gate driver clock coupled to the substrate, wherein the gate driver clock is configured to drive gates in the pixel circuitry; and a compensation gate driver configured to apply to the substrate a compensation voltage inverse to a voltage applied by the gate driver clock to at least partially compensate for voltage fluctuations in the touch electrode resulting from application of the voltage. ### Claim 10 (depends on 9) The electronic display of claim 9 comprising an additional gate driver clock coupled to the substrate, wherein the additional gate driver clock is configured to drive additional gates in the pixel circuitry. ### Claim 11 (depends on 10) The electronic display of claim 10, wherein the compensation gate driver is configured to compensate both the voltage applied by the gate driver clock and an additional voltage applied to the additional gates by the additional gate driver clock. ### Claim 12 (depends on 11) The electronic display of claim 11, wherein an output of the compensation gate driver comprises: a logical AND of an output of the gate driver clock and an output of the additional gate driver clock; and an inversion of the logical ANDing of the output of the gate driver clock and the additional gate driver clock. ### Claim 13 (depends on 10) The electronic display of claim 10 comprising an additional compensation gate driver to apply an additional compensation voltage inverse to an additional voltage applied by the additional gate driver clock to at least partially compensate for voltage fluctuations in the touch electrode resulting from application of the additional voltage. ### Claim 14 (depends on 9) The electronic display of claim 9, wherein the gates are located in an active area of the electronic display. ### Claim 15 An electronic display comprising: a touch electrode configured to detect touch on the display; a first gate driver clock configured to drive a first gate in the electronic display; a second gate driver clock configured to drive a second gate in the electronic display; a first compensation driver to apply a first compensation voltage inverse to a first voltage applied by the first gate driver clock to at least partially compensate for voltage fluctuations in the touch electrode resulting from application of the first voltage; and a second compensation driver to apply a second compensation voltage inverse to a second voltage applied by the second gate driver clock to at least partially compensate for voltage fluctuations in the touch electrode resulting from application of the second voltage. ### Claim 16 (depends on 15) The electronic display of claim 15 comprising a third gate driver clock configured to drive a third gate in the electronic display. ### Claim 17 (depends on 16) The electronic display of claim 16, wherein the first compensation driver is configured to at least partially compensate voltage fluctuations in the touch electrode due to application of a third voltage applied by the third gate driver clock, wherein the first gate driver clock and the third gate driver clock do not apply a voltage simultaneously. ### Claim 18 (depends on 16) The electronic display of claim 16 comprising: a third compensation driver to apply a third compensation voltage inverse to a third voltage applied by the third gate driver clock to at least partially compensate for voltage fluctuations in the touch electrode resulting from application of the third voltage. ### Claim 19 (depends on 15) The electronic display of claim 15, wherein the first and second gates are in an active area of the electronic display. ### Claim 20 (depends on 19) The electronic display of claim 19, wherein the first and second gates comprise thin film transistors.