# US 12,182,361 B2 · Display device having touch sensor and method for driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,182,361 B2 - Document ID: US12182361B2 - Status: Granted - Kind: B2 - Application number: 18/512,793 - Filed: 2023-11-17 - Published: 2024-03-14 - Granted: 2024-12-31 - Earliest claimed: 2020-12-29 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Hyun Woo Jang; Ki Yong Kim; Jae Kyu Park; Young Woo Jo - Web page: https://patentgrep.com/patent/US12182361B2 ## CPC - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - 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 3/041662: {using alternate mutual and self-capacitive scanning} - 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 display device having a touch sensor can include a display panel including a plurality of touch electrodes, and a readout integrated circuit (IC). Also, the readout IC is configured to apply a touch driving signal to the plurality of touch electrodes and amplify charges from the plurality touch electrodes according to an amplifier reset signal to generate an amplifier output voltage, and differentially adjust a toggle timing of the amplifier reset signal based on positions of the plurality of touch electrodes to control a level of the amplifier output voltage. ## Claims ### Claim 1 A display device having a touch sensor, comprising: a display panel including a plurality of touch electrodes; and a readout integrated circuit (IC) configured to: apply a touch driving signal to the plurality of touch electrodes and amplify charges from the plurality touch electrodes according to an amplifier reset signal to generate an amplifier output voltage, and differentially adjust a toggle timing of the amplifier reset signal based on positions of the plurality of touch electrodes to control a level of the amplifier output voltage. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the readout IC is further configured to: differentially adjust an on-start timing of the amplifier reset signal and an on duty of the amplifier reset signal based on the positions of the plurality of touch electrodes. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the readout IC includes a touch sensing circuit and an amplifier output control circuit. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the amplifier output control circuit is configured to: adjust the toggle timing of the amplifier reset signal to a first on-start timing for a first group of touch electrodes at a first position from among the plurality of touch electrodes, and adjust the toggle timing of the amplifier reset signal to a second on-start timing ahead of the first on-start timing for second group of touch electrodes at a second position from among the plurality of touch electrodes, and wherein the first position is farther away from the touch sensing circuit than the second position. ### Claim 5 (depends on 4) The display device according to claim 4, wherein the amplifier reset signal having the first on-start timing and the amplifier reset signal having the second on-start signal have a same on duty and different phases. ### Claim 6 (depends on 4) The display device according to claim 4, wherein the amplifier reset signal having the first on-start timing has a first on duty, and the amplifier reset signal having the second on-start signal has a second on duty, and wherein the first on duty is shorter than the second on duty. ### Claim 7 (depends on 3) The display device according to claim 3, wherein the amplifier output control circuit is further configured to: adjust a voltage amplitude of the touch driving signal to a first value for a first group of touch electrodes at a first position from among the plurality of touch electrodes, and adjust the voltage amplitude of the touch driving signal to a second value less than the first value for a second group of touch electrodes at a second position from among the plurality of touch electrodes, and wherein the first position is farther away from the touch sensing circuit than the second position. ### Claim 8 (depends on 7) The display device according to claim 7, wherein the amplifier output control circuit is further configured to: when a touch sensing period and a display period are alternately arranged multiple times in one frame, adjust the voltage amplitude of the touch driving signal to the first value or the second value in the display period. ### Claim 9 (depends on 3) The display device according to claim 3, wherein the touch sensing circuit is configured to: generate the amplifier output voltage based on a finger touch input in a finger sensing mode, and generate the amplifier output voltage based on a pen touch input in a pen sensing mode. ### Claim 10 (depends on 9) The display device according to claim 9, wherein a touch sensitivity in the finger sensing mode is different than a touch sensitivity in the pen sensing mode. ### Claim 11 (depends on 9) The display device according to claim 9, wherein the amplifier output control circuit is configured to: adjust the toggle timing of the amplifier reset signal to a first on-start timing in the pen sensing mode, and adjust the toggle timing of the amplifier reset signal to a second on-start timing ahead of the first on-start timing in the finger sensing mode. ### Claim 12 (depends on 3) The display device according to claim 3, wherein the touch sensing circuit is configured to: generate the amplifier output voltage based on a self-capacitance according to a touch input in a self-sensing mode, and generate the amplifier output voltage based on a mutual capacitance according to a touch input in a mutual sensing mode. ### Claim 13 (depends on 12) The display device according to claim 12, wherein a touch sensitivity in the self-sensing mode is different than a touch sensitivity in the mutual sensing mode. ### Claim 14 (depends on 12) The display device according to claim 12, wherein the amplifier output control circuit is configured to: adjust the toggle timing of the amplifier reset signal to a first on-start timing in the self-sensing mode, and adjust the toggle timing of the amplifier reset signal to a second on-start timing ahead of the first on-start timing in the mutual sensing mode. ### Claim 15 (depends on 1) The display device according to claim 1, wherein the readout IC includes a plurality of multiplexers, a touch sensing circuit, and a common voltage generator.