# US 11,907,470 B2 · Touch display device and touch sensing system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,907,470 B2 - Document ID: US11907470B2 - Status: Granted - Kind: B2 - Application number: 17/964,780 - Filed: 2022-10-12 - Published: 2023-04-27 - Granted: 2024-02-20 - Earliest claimed: 2021-10-27 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: HyunWoo Jang - Web page: https://patentgrep.com/patent/US11907470B2 ## CPC - G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads} - G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally} - G06F 3/0412: {Digitisers structurally integrated in a display} - 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 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G06F 3/0443: {using a single layer of sensing electrodes} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A touch display device and a touch sensing system are disclosed. When a touch controller transmits or receives data to or from a plurality of touch driving circuits through a common line, the touch driving circuit that does not transmit a sensing completion signal to the touch controller may identify whether a malfunctioned state occurs based on an operation state when a read command is received from the touch controller and may transmit transformed sensing data to the touch controller. Accordingly, the touch controller easily identifies the malfunctioned state of the touch driving circuit and performs control according to a type of the malfunctioned state, thereby preventing or reducing the performance degradation of touch sensing due to a malfunction of the touch driving circuit. ## Claims ### Claim 1 A touch display device comprising: a plurality of touch electrodes in a display panel; a plurality of touch driving circuits configured to drive at least some of the plurality of touch electrodes; and a touch controller configured to control the plurality of touch driving circuits, wherein: the touch controller is configured to transmit or receive data to or from the plurality of touch driving circuits and transmit a read command to the plurality of touch driving circuits responsive to receiving a sensing completion signal from a representative touch driving circuit among the plurality of touch driving circuits; and touch driving circuits excluding the representative touch driving circuit among the plurality of touch driving circuits are configured to transmit transformed sensing data to the touch controller responsive to receiving the read command in a malfunctioned state. ### Claim 2 (depends on 1) The touch display device of claim 1, wherein the malfunctioned state is a state in which the read command is received in a state in which the sensing completion signal is not generated by the touch driving circuit, a state in which a certain time has elapsed after the sensing completion signal is generated before the touch driving circuit receives the read command, a state in which a difference between a time point at which the sensing completion signal is generated by the touch driving circuit and a time point at which the sensing completion signal is generated by the representative touch driving circuit is out of a preset range, a state in which the touch driving circuit is performing sensing when receiving the read command, a state in which a toggling number of a touch clock signal is different from a preset number when the touch driving circuit transmits the sensing data, or a state in which the touch driving circuit reads a memory other than a memory in which the sensing data is stored. ### Claim 3 (depends on 1) The touch display device of claim 1, wherein the touch controller is configured to increase a high level voltage of a touch driving modulation signal supplied to the plurality of touch driving circuits responsive to receiving the transformed sensing data. ### Claim 4 (depends on 1) The touch display device of claim 1, wherein the touch controller is configured to decrease a low level voltage of a touch driving modulation signal supplied to the plurality of touch driving circuits responsive to receiving the transformed sensing data. ### Claim 5 (depends on 1) The touch display device of claim 1, wherein the touch controller is configured to change a sensing reference level of the plurality of touch driving circuits responsive to receiving the transformed sensing data. ### Claim 6 (depends on 1) The touch display device of claim 1, wherein the touch driving circuits excluding the representative touch driving circuit are configured to not transmit the generated sensing completion signal to the touch controller when the sensing completion signal is generated. ### Claim 7 (depends on 1) The touch display device of claim 1, wherein the touch controller is configured to transmit or receive data to or from each of the plurality of touch driving circuits through a separate line or a common line. ### Claim 8 (depends on 1) The touch display device of claim 1, wherein the transformed sensing data is data transformed to be different from data transmitted by the touch driving circuit in a normal operation state. ### Claim 9 (depends on 2) The touch display device of claim 2, wherein the touch driving circuit variously transforms the sensing data according to a type of the malfunctioned state. ### Claim 10 (depends on 9) The touch display device of claim 9, wherein the touch controller identifies a type of the transformed sensing data to identify the type of the malfunctioned state of the touch driving circuit. ### Claim 11 (depends on 1) The touch display device of claim 1, wherein the transformed sensing data is: data in which a maximum value and a minimum value alternate; data in which odd-numbered rows have a minimum value and even-numbered rows have a maximum value; data in which odd-numbered rows have a maximum value and even-numbered rows have a minimum value; data in which odd-numbered columns have a maximum value and even-numbered columns have a minimum value; or data in which odd-numbered columns have a minimum value and even-numbered columns have a maximum value. ### Claim 12 (depends on 1) The touch display device of claim 1, wherein when the touch controller receives the transformed sensing data from the touch driving circuit excluding the representative touch driving circuit among the plurality of touch driving circuits, the touch controller determines that the touch driving circuit is in the malfunctioned state, and the touch controller identifies a malfunctioned state of the representative touch driving circuit based on whether the sensing completion signal is received. ### Claim 13 A touch sensing system comprising: a first touch driving circuit configured to drive a plurality of first touch electrodes; a second touch driving circuit configured to drive a plurality of second touch electrodes; and a touch controller configured to control the first touch driving circuit and the second touch driving circuit, wherein: the touch controller is configured to transmit or receive data to or from the first touch driving circuit and the second touch driving circuit, and transmit a read command to the first touch driving circuit and the second touch driving circuit responsive to receiving a sensing completion signal from the first touch driving circuit; and the second touch driving circuit is configured to transmit transformed sensing data to the touch controller responsive to receiving the read command in a malfunctioned state. ### Claim 14 (depends on 13) The touch sensing system of claim 13, wherein the malfunctioned state is a state in which the read command is received in a state in which the sensing completion signal is not generated by the second touch driving circuit. ### Claim 15 (depends on 13) The touch sensing system of claim 13, wherein the malfunctioned state is a state in which a certain time has elapsed after the sensing completion signal is generated before the second touch driving circuit receives the read command. ### Claim 16 (depends on 15) The touch sensing system of claim 15, wherein the second touch driving circuit does not transmit the sensing completion signal to the touch controller, the sensing completion signal generated before the read command is received. ### Claim 17 (depends on 13) The touch sensing system of claim 13, wherein the touch driving circuit variously transforms the sensing data according to a type of the malfunctioned state. ### Claim 18 A touch sensing system comprising: a first touch driving circuit configured to drive a plurality of first touch electrodes; a second touch driving circuit configured to drive a plurality of second touch electrodes; and a touch controller configured to control the first touch driving circuit and the second touch driving circuit, wherein, responsive to a difference between a time point at which a sensing completion signal is generated by the first touch driving circuit and a time point at which when the sensing completion signal is generated by the second touch driving circuit is greater than or equal to a preset value, the touch controller changes a level of a touch driving modulation signal supplied to the first touch driving circuit and the second touch driving circuit. ### Claim 19 (depends on 18) The touch sensing system of claim 18, wherein: the sensing completion signal generated by the first touch driving circuit is transmitted to the touch controller; and the sensing completion signal generated by the second touch driving circuit is not transmitted to the touch controller. ### Claim 20 (depends on 19) The touch sensing system of claim 19, wherein the touch controller receives transformed sensing data from the second touch driving circuit before the level of the touch driving modulation signal is changed.