# US 10,481,708 B2 · Method for eliminating/reducing image sticking of in-cell touch display and mobile device using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,708 B2 - Document ID: US10481708B2 - Status: Granted - Kind: B2 - Application number: 15/350,542 - Filed: 2016-11-14 - Published: 2017-12-21 - Granted: 2019-11-19 - Earliest claimed: 2016-06-15 - Assignees: Focaltech Electronics, Ltd. - Applicants: FocalTech Electronics, Ltd. - Inventors: Shen-Chia Huang; Ho-Nien Yang - Web page: https://patentgrep.com/patent/US10481708B2 ## CPC - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally} - G06F 3/0443: {using a single layer of sensing electrodes} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G09G 2310/0232: Special driving of display border areas - G09G 2320/0257: Reduction of after-image effects - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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 A method for eliminating image sticking of an in-cell touch display and a mobile device using the same are provided. The method comprises the steps of: providing at least a first common electrode and a second common electrode in the in-cell touch display to perform touch sensing, wherein the first common electrode is electrically connected to a first pin of a touch control circuit through a first charge/discharge route, the second common electrode is electrically connected to a second pin of the touch control circuit through a second charge/discharge route; and in a time except for display time, controlling the first pin and the second pin so that a voltage of the first pin is higher than a voltage of the second pin for at least a first preset period, and then controlling the first pin and the second pin so that a voltage of the second pin is higher than the voltage of the first pin for at least the first preset period. ## Claims ### Claim 1 A method for eliminating/reducing image sticking of an in-cell touch display, the method comprising the steps of: (a) providing at least a first sensing electrode and a second sensing electrode in the in-cell touch display to perform touch sensing operation, wherein the first sensing electrode is electrically connected to a first pin of a touch control circuit through a first charge/discharge route, and the second sensing electrode is electrically connected to a second pin of the touch control circuit through a second charge/discharge route; and (b) in a time except for display time, controlling the first pin and the second pin to make a voltage of the first pin be higher than a voltage of the second pin for at least a first preset period, and then controlling the first pin and the second pin to make the voltage of the second pin higher than the voltage of the first pin for at least the first preset period, wherein the first sensing electrode and the second sensing electrode are disposed on a same layer; wherein an electric field between the first sensing electrode and the second sensing electrode is changed in step (b) and accumulated charges of the neighboring sensing electrodes are effectively eliminated or reduced, wherein the accumulated charges are caused by a voltage difference between the first sensing electrode and the second sensing electrode when touch sensing operation is performed. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: dividing a frame period into display sub-periods and touch sub-periods; wherein the step (b) comprises: in the first preset period before the Kth touch sub-period, controlling the second pin to provide a specific voltage and controlling the first pin to provide a display common voltage, and then controlling the first pin and the second pin concurrently to make the second pin and the first pin perform touch sensing; and controlling the first pin to provide the specific voltage in the first preset period before ending of the Kth touch sub-period, and then controlling the second pin and the first pin to output the display common voltage concurrently, where K is a natural number. ### Claim 3 (depends on 1) The method according to claim 1, wherein, step (b) comprises: controlling the second pin to provide a specific voltage and controlling the first pin to provide a display common voltage in a Kth vertical synchronization period; and controlling the first pin to provide the specific voltage and controlling the second pin to output the display common voltage in a (K+1)th vertical synchronization period, where K is a natural number. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: dividing a frame period into display sub-periods and touch sub-periods; wherein, step (b) comprises: in the first preset period before the Kth touch sub-period, controlling the first pin to provide a voltage higher than the voltage of the second pin, and then controlling the second pin and the first pin to perform touch sensing; and controlling the second pin to provide the voltage higher than the voltage of the first pin in the first preset period before ending of the Kth touch sub-period, and controlling the first pin and the second pin to make the first pin and the second pin output a display common voltage concurrently after the first preset period elapses. ### Claim 5 (depends on 1) The method according to claim 1, wherein the step (b) comprises: in the first preset period before a Kth vertical synchronization period, firstly controlling the second pin to provide a specific voltage, and controlling the first pin to provide a display common voltage, and then controlling the first pin and the second pin concurrently to make the second pin and the first pin perform touch sensing, and controlling the first pin to provide the specific voltage and controlling the second pin to output the display common voltage in the first preset period before ending of the Kth vertical synchronization period, where K is a natural number. ### Claim 6 (depends on 1) The method according to claim 1, wherein the in-cell touch display comprises N first sensing electrodes and N second sensing electrodes, wherein the Kth first sensing electrode is electrically connected to the Kth first pin of the touch control circuit through a Kth first charge/discharge route, and the Kth second sensing electrode is electrically connected to a Kth second pin of the touch control circuit through a Kth second charge/discharge route, where K and N are natural numbers, and N≥K>0. ### Claim 7 (depends on 6) The method according to claim 6, further comprising: dividing a frame period into display sub-periods and touch sub-periods; wherein the step (b) comprises: in the first preset period before the Ith touch sub-period, firstly controlling the second pins to provide a specific voltage, and controlling the first pins to provide a display common voltage, and then concurrently controlling the first pins and the second pins to make the second pins and the first pins perform touch sensing; and in the first preset period before ending of the Ith display sub-period, firstly controlling the first pins to provide the specific voltage, and then controlling the second pins and the first pins to concurrently output a display common voltage, where I is a natural number. ### Claim 8 (depends on 6) The method according to claim 6, further comprising: dividing a frame period into display sub-periods and touch sub-periods; wherein the step (b) comprises: in the first preset period before the Ith touch sub-period, controlling the first pins to provide a voltage higher than the voltages of the second pins, and then concurrently controlling the second pin and the first pin to perform touch sensing; and controlling the second pins to provide the voltage higher than the voltages of the first pins in the first preset period before ending of the Ith display sub-period, and controlling the first pin and the second pin to make the first pin and the second pin output a display common voltage concurrently after the first preset period elapses, where I is a natural number. ### Claim 9 A mobile device, comprising: an in-cell touch display, comprising at least a first sensing electrode and a second sensing electrode to perform touch sensing; and a touch control circuit, comprising at least a first pin and a second pin, wherein the first sensing electrode is electrically connected to the first pin of a touch control circuit through a first charge/discharge route, the second sensing electrode is electrically connected to a second pin of the touch control circuit through a second charge/discharge route; wherein in a time except for display time, the touch control circuit controls the first pin and the second pin to make a voltage of the first pin be higher than a voltage of the second pin for at least a first preset period, and then the touch control circuit controls the first pin and the second pin to make the voltage of the second pin be higher than the voltage of the first pin for at least the first preset period such that an electric field between the first sensing electrode and the second sensing electrode is changed and accumulated charges of the neighboring sensing electrodes are effectively eliminated or reduced, wherein the accumulated charges is caused by a voltage difference between the first sensing electrode and the second sensing electrode when touch sensing operation is performed, wherein the first sensing electrode and the second sensing electrode are disposed side by side on a same layer. ### Claim 10 (depends on 9) The mobile device according to claim 9, wherein a frame period is divided into display sub-periods and touch sub-periods when the operation of the touch control circuit is performed, wherein, in the first preset period before the Kth touch sub-period, the touch control circuit controls the second pin to provide a specific voltage and controlling the first pin to provide a display common voltage, and then the touch control circuit controls the first pin and the second pin concurrently to make the second pin and the first pin perform touch sensing, and the touch control circuit controls the first pin to provide the specific voltage in the first preset period before ending of the Kth touch sub-period, and then the touch control circuit controls the second pin and the first pin to output the display common voltage concurrently, where K is a natural number. ### Claim 11 (depends on 9) The mobile device according to claim 9, wherein the touch control circuit controls the second pin to provide a specific voltage and the touch control circuit controls the first pin to provide a display common voltage in a Kth vertical synchronization period, and the touch control circuit controls the first pin to provide the specific voltage and the touch control circuit controls the second pin to output the display common voltage in a (K+1)th vertical synchronization period, is performed, where K is a natural number. ### Claim 12 (depends on 9) The mobile device according to claim 9, wherein a frame period is divided into display sub-periods and touch sub-periods when the operation of the touch control circuit is performed, in the first preset period before the Kth touch sub-period, the touch control circuit controls the first pin to provide a voltage higher than the voltage of the second pin, and then the touch control circuit controls the second pin and the first pin to perform touch sensing; and before ending of the Kth touch sub-period, the touch control circuit controls the second pin to provide the voltage higher than the voltage of the first pin in the first preset period, and the touch control circuit controls the first pin and the second pin to make the first pin and the second pin output a display common voltage concurrently after the first preset period elapses, where K is a natural number. ### Claim 13 (depends on 9) The mobile device according to claim 9, wherein, in the first preset period before a Kth vertical synchronization period, the touch control circuit firstly controls the second pin to provide a specific voltage, and the touch control circuit controls the first pin to provide a display common voltage, and then the touch control circuit controls the first pin and the second pin concurrently to make the second pin and the first pin perform touch sensing, and the touch control circuit controls the first pin to provide the specific voltage and the touch control circuit controls the second pin to output the display common voltage in the first preset period before ending of the Kth vertical synchronization period, where K is a natural number. ### Claim 14 (depends on 9) The mobile device according to claim 9, wherein the in-cell touch display comprises N first sensing electrodes and N second sensing electrodes, wherein the Kth first sensing electrode is electrically connected to the Kth first pin of the touch control circuit through a Kth first charge/discharge route, and the Kth second sensing electrode is electrically connected to a Kth second pin of the touch control circuit through a Kth second charge/discharge route, where K and N are natural numbers, and N≥K>0. ### Claim 15 (depends on 14) The mobile device according to claim 14, wherein a frame period is divided into display sub-periods and touch sub-periods when the operation of the touch control circuit is performed, in a second preset period before the Ith touch sub-period, the touch control circuit firstly controls the second pins to provide a specific voltage, and the touch control circuit controls the first pins to provide a display common voltage, and then the touch control circuit concurrently controls the first pins and the second pins to make the second pins and the first pins perform touch sensing; and in the second preset period before ending of the Ith display sub-period, the touch control circuit firstly controls the first pins to provide the specific voltage, and then the touch control circuit controls the second pins and the first pins to concurrently output a display common voltage, where I is a natural number. ### Claim 16 (depends on 14) The mobile device according to claim 14, wherein a frame period is divided into display sub-periods and touch sub-periods when the operation of the touch control circuit is performed, wherein the step (b) comprises: in the first preset period before the Ith touch sub-period, the touch control circuit controls the first pins to provide a voltage higher than the voltages of the second pins, and then the touch control circuit concurrently controls the second pin and the first pin to perform touch sensing; and the touch control circuit controls the second pins to provide the voltage higher than the voltages of the first pins in the first preset period before ending of the Ith display sub-period, and the touch control circuit controls the first pin and the second pin to make the first pin and the second pin output a display common voltage concurrently after the first preset period elapses, where I is a natural number. ### Claim 17 A method for eliminating/reducing image sticking of an in-cell touch display, the method comprising the steps of: (a) providing at least a first sensing electrode and a second sensing electrode in the in-cell touch display to perform touch sensing operation, wherein the first sensing electrode is electrically connected to a first pin of a touch control circuit through a first charge/discharge route, and the second sensing electrode is electrically connected to a second pin of the touch control circuit through a second charge/discharge route wherein the first sensing electrode and the second sensing electrode are respectively independent to perform sensing in the touch sensing operation; and (b) in a time except for display time, controlling the first pin and the second pin to make a voltage of the first pin be higher than a voltage of the second pin for at least a first preset period, and then controlling the first pin and the second pin to make the voltage of the second pin higher than the voltage of the first pin for at least the first preset period, wherein the first sensing electrode and the second sensing electrode are disposed on a same layer, wherein an electric field between the first sensing electrode and the second sensing electrode is changed in step (b) and accumulated charges of the neighboring sensing electrodes are effectively eliminated or reduced. ### Claim 18 (depends on 17) The method according to claim 17, wherein the first sensing electrode and the second sensing electrode are side by-side disposed on a same layer. ### Claim 19 (depends on 17) The method according to claim 17, wherein the accumulated charges is caused by a voltage difference between the first sensing electrode and the second sensing electrode when touch sensing operation is performed. ### Claim 20 (depends on 17) The method according to claim 17, wherein the first sensing electrode and the second sensing electrode are arranged in a matrix array.