# US 11,307,698 B2 · Touch display device, driving circuit and driving method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,698 B2 - Document ID: US11307698B2 - Status: Granted - Kind: B2 - Application number: 17/116,530 - Filed: 2020-12-09 - Published: 2021-06-24 - Granted: 2022-04-19 - Earliest claimed: 2019-12-24 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Youngwoo Jo; HyeongWon Kang - Web page: https://patentgrep.com/patent/US11307698B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 1/3262: {Power saving in digitizer or tablet} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally} - G06F 3/044: by capacitive means - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3674: {Details of drivers for scan electrodes} - G09G 3/3685: {Details of drivers for data electrodes} - G06F 3/0443: {using a single layer of sensing electrodes} - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/0297: Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2330/021: Power management, e.g. power saving - G09G 2370/08: Details of image data interface between the display device controller and the data line driver circuit - 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 Embodiments of the present disclosure relate to touch display devices, driving circuits, and driving methods, and more specifically, to a touch display device, a driving circuit, and a driving method for enabling the functionality of a micro control unit to be minimized and power consumption to be reduced by allowing one or more combined integrated circuits to generate a touch sensing control signal and provide the generated signal to a plurality of combined integrated circuits. Further, according to embodiments of the present disclosure, touch display devices, driving circuits, and driving methods are provided for enabling power consumption of a touch power integrated circuit to be reduced by using a touch sensing control signal generated by one or more combined integrated circuits as a load-free driving signal. ## Claims ### Claim 1 A touch display device comprising: a display panel including a plurality of touch electrodes, the display panel configured to switch between a first mode and a second mode that is different from the first mode; a gate driving circuit configured to provide gate signals to a plurality of gate lines; a first combined integrated circuit and a second combined integrated circuit configured to provide data voltages to a plurality of data lines, wherein the first combined integrated circuit is configured to generate a first clock signal and a first touch sensing control signal that are provided to the second combined integrated circuit during the first mode but not the second mode; a micro control unit configured to generate a second clock signal and a second touch sensing control signal that are provided to the first combined integrated circuit and the second combined integrated circuit during the second mode but not the first mode; wherein the first combined integrated circuit and the second combined integrated circuit are configured to provide at least one touch driving signal to the display panel and configured to sense a touch based on at least one touch sensing signal received in response to the at least one touch driving signal according to the first clock signal and the first touch sensing control signal provided by the first combined integrated circuit during the first mode, and wherein the first combined integrated circuit and the second combined integrated circuit are configured to provide at least one touch driving signal to the display panel and configured to sense a touch based on at least one touch sensing signal received in response to the at least one touch driving signal according to the second clock signal and the second touch sensing control signal provided by the micro control unit during the second mode. ### Claim 2 (depends on 1) The touch display device according to claim 1, wherein the first combined integrated circuit and the second combined integrated circuit each includes a clock signal output pin and a touch sensing control signal output pin, and the first touch sensing control signal includes a touch synchronization signal or a touch driving signal. ### Claim 3 (depends on 1) The touch display device according to claim 1, further comprising: a first multiplexer configured to select the first clock signal to provide to the first combined integrated circuit and the second combined integrated circuit during the first mode, and select the second clock signal to provide to the first combined integrated circuit and the second combined integrated circuit during the second mode; a second multiplexer configured to select the first touch sensing control signal to provide to the first combined integrated circuit and the second combined integrated circuit during the first mode, and select the second touch sensing control signal to provide to the first combined integrated circuit and the second combined integrated circuit during the second mode. ### Claim 4 (depends on 1) The touch display device according to claim 1, wherein the first mode is a low power mode of the touch display device and the second mode is a normal mode of the touch display device. ### Claim 5 (depends on 1) The touch display device according to claim 1, wherein the first combined integrated circuit is disposed at a location closer to the micro control unit than the second combined integrated circuit. ### Claim 6 (depends on 1) The touch display device according to claim 1, wherein at least one of the first combined integrated circuit and the second combined integrated circuit comprises: an oscillator configured to generate a pulse signal of a predetermined frequency; a touch signal generator configured to generate the first clock signal and the first touch sensing control signal using the pulse signal; a touch detector configured to sense a touch based on the at least one touch sensing signal provided from the display panel; an interface controller configured to output a result from the touch sensing; and a driving controller configured to control touch sensing operations of the touch detector and the interface controller according to the first clock signal and the first touch sensing control signal. ### Claim 7 (depends on 6) The touch display device according to claim 6, wherein the touch detector determines presence or absence of a touch by comparing touch sensing signals received during a predetermined time period, comparing an average value of the touch sensing signals received during the predetermined time period with each touch sensing signal, or comparing the at least one touch sensing signal with a reference value stored in a memory. ### Claim 8 (depends on 1) The touch display device according to claim 1, further comprising: a touch power integrated circuit configured to generate an alternating current (AC) signal applied to the plurality of touch electrodes through the first combined integrated circuit and the second combined integrated circuit during a touch sensing period; and a multiplexer configured to select one of the first touch sensing control signal generated from the first combined integrated circuit and the AC signal generated from the touch power integrated circuit according to the first mode or the second mode of the touch display device, and providing the selected signal to the first combined integrated circuit or the second combined integrated circuit. ### Claim 9 (depends on 8) The touch display device according to claim 8, further comprising one or more buffers disposed between the first combined integrated circuit and the multiplexer. ### Claim 10 (depends on 8) The touch display device according to claim 8, further comprising a switch disposed between the touch power integrated circuit and the gate driving circuit, and configured to control a gate low voltage applied to the gate driving circuit according to an operation mode. ### Claim 11 (depends on 1) The touch display device according to claim 1, wherein the first clock signal and the first touch sensing control signal are provided to the first combined integrated circuit during the first mode of the touch display device. ### Claim 12 A driving circuit of a touch display device comprising a first combined integrated circuit and a second combined integrated circuit providing data voltages, and the first combined integrated circuit and the second combined integrated circuit for providing at least one touch driving signal to the display panel and sensing a touch based on at least one touch sensing signal received in response to the at least one touch driving signal, the first combined integrated circuit comprises: an oscillator configured to generate a pulse signal of a predetermined frequency; a touch signal generator configured to generate a first clock signal and a first touch sensing control signal using the pulse signal; a touch detector configured to sense a touch based on the at least one first touch sensing signal provided from the display panel; an interface controller configured to output a result from the touch sensing; and a driving controller configured to control touch sensing operations of the touch detector and the interface controller according to the first clock signal and the first touch sensing control signal. ### Claim 13 (depends on 12) The driving circuit of the touch display device according to claim 12, further comprising: a micro control unit configured to provide a second clock signal and a second touch sensing control signal to the first combined integrated circuit and the second combined integrated circuit; and a multiplexer configured to select one clock signal and one touch sensing control signal to be provided to the first combined integrated circuit and the second combined integrated circuit generated from the first combined integrated circuit and the micro control unit according to an operation mode. ### Claim 14 (depends on 13) The driving circuit of the touch display device according to claim 13, wherein the multiplexer selects the second clock signal and the second touch sensing control signal to be provided to the first combined integrated circuit and the second combined integrated circuit generated from the micro control unit in a normal mode, and selects the first clock signal and the first touch sensing control signal to be provided to the first combined integrated circuit and the second combined integrated circuit generated from the first combined integrated circuit in a low power mode. ### Claim 15 (depends on 13) The driving circuit of the touch display device according to claim 13, wherein the first combined integrated circuit is disposed at a location closer to the micro control unit than the second combined integrated circuit. ### Claim 16 (depends on 12) The driving circuit of the touch display device according to claim 12, wherein the touch detector determines presence or absence of a touch by comparing touch sensing signals received during a predetermined time period, comparing an average value of the touch sensing signals received during the predetermined time period with each touch sensing signal, or comparing the at least one touch sensing signal with a reference value stored in a memory. ### Claim 17 (depends on 12) The driving circuit of the touch display device according to claim 12, further comprising: a touch power integrated circuit configured to generate an alternating current (AC) signal applied to a plurality of touch electrodes through the first combined integrated circuit and the second combined integrated circuit during a touch sensing period; and a multiplexer configured to select one of the first touch sensing control signal generated from the first combined integrated circuit and the AC signal generated from the touch power integrated circuit according to an operation mode, and providing the selected signal to the first combined integrated circuit and the second combined integrated circuit. ### Claim 18 (depends on 17) The driving circuit of the touch display device according to claim 17, further comprising one or more buffers disposed between the first combined integrated circuit and the multiplexer. ### Claim 19 (depends on 17) The driving circuit of the touch display device according to claim 17, further comprising a switch disposed between the touch power integrated circuit and a gate driving circuit providing gate signals to a display panel, and configured to control a gate low voltage applied to the gate driving circuit according to an operation mode. ### Claim 20 (depends on 12) The driving circuit according to claim 12, wherein the first combined integrated circuit and the second combined integrated circuit each includes a clock signal output pin and a touch sensing control signal output pin, and the first touch sensing control signal includes a touch synchronization signal or a touch driving signal. ### Claim 21 A method of driving a touch display device configured to switch between a first mode and a second mode that is different from the first mode and comprising a gate driving circuit providing gate signals to a display panel including a plurality of touch electrodes, a first combined integrated circuit and a second combined integrated circuit providing data voltages, and the first combined integrated circuit and the second combined integrated circuit for providing at least one touch driving signal to the display panel and sensing a touch based on at least one touch sensing signal received in response to the at least one touch driving signal, the method comprising: generating a first clock signal and a first touch sensing control signal in the first combined integrated circuit during the first mode but not the second mode; generating a second clock signal and a second touch sensing control signal in a micro control unit during the second mode but not the first mode; and providing the first clock signal and the first touch sensing control signal generated by the first combined integrated circuit to the second combined integrated circuit during the first mode, and providing the second clock signal and the second touch sensing control signal generated by the micro control unit to the first combined integrated circuit and the second combined integrated circuit during the second mode. ### Claim 22 (depends on 21) The method according to claim 21, further comprising determining presence or absence of a touch by comparing touch sensing signals received during a predetermined time period, comparing an average value of the touch sensing signals received during the predetermined time period with each touch sensing signal, or comparing the at least one touch sensing signal with a reference value stored in a memory. ### Claim 23 (depends on 21) The method according to claim 21, further comprising: generating an alternating current (AC) signal applied to the plurality of touch electrodes through the first combined integrated circuit and the second combined integrated circuit by a touch power integrated circuit during a touch sensing period; and selecting one of the first touch sensing control signal generated by the first combined integrated circuit and the AC signal generated by the touch power integrated circuit according to the first mode or the second mode, and providing the selected signal to the first combined integrated circuit and the second combined integrated circuit. ### Claim 24 (depends on 23) The method according to claim 23, further comprising controlling a gate low voltage applied to the gate driving circuit according to an operation mode through a switch disposed between the touch power integrated circuit and the gate driving circuit. ### Claim 25 (depends on 21) The method according to claim 21, wherein the first clock signal and the first touch sensing control signal are provided to the first combined integrated circuits during the first mode of the touch display device.