# US 12,182,362 B2 · Touch display device and level shifter for touch display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,182,362 B2 - Document ID: US12182362B2 - Status: Granted - Kind: B2 - Application number: 18/536,058 - Filed: 2023-12-11 - Published: 2024-03-28 - Granted: 2024-12-31 - Earliest claimed: 2021-09-10 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Sangug An; SungIl Byun - Web page: https://patentgrep.com/patent/US12182362B2 ## CPC - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Embodiments of the disclosure relate to a touch display device and a level shifter for a touch display device. Specifically, embodiments of the disclosure may provide a touch display device comprising a plurality of touch electrodes and an overcurrent detection circuit configured to detect a current flowing through at least one touch pad electrically connected with at least one touch electrode among the plurality of touch electrodes. Thus, embodiments of the disclosure may provide a touch display device and a level shifter for a touch display device, which may increase the accuracy of touch sensing and easily determine whether the touch panel has an abnormality. ## Claims ### Claim 1 A touch display device, comprising: a plurality of touch electrodes; a touch driving circuit outputting a touch driving signal; and a level shifter generating a voltage level-controlled touch driving signal by controlling a voltage level of the touch driving signal, and outputting the voltage level-controlled touch driving signal, wherein the plurality of touch electrodes includes X-touch electrodes positioned on two opposite sides of a Y-touch electrode line, wherein the X-touch electrodes are electrically connected to an X-touch electrode line that extends in a first direction and the Y-touch electrode line extends in a second direction different from the first direction. ### Claim 2 (depends on 1) The touch display device of claim 1, further comprising: an overcurrent detection circuit configured to detect a current flowing through at least one touch pad electrically connected with at least one touch electrode among the plurality of touch electrodes. ### Claim 3 (depends on 2) The touch display device of claim 2, wherein the level shifter includes a plurality of output pins, the level shifter outputting the voltage level-controlled touch driving signal to the at least one touch pad, wherein the overcurrent detection circuit is electrically connected to at least one output pin among the plurality of output pins. ### Claim 4 (depends on 3) The touch display device of claim 3, wherein in the level shifter, while any one output pin among the plurality of output pins is electrically connected alternately to a high-potential voltage source and a low-potential voltage source, remaining output pins except for the any one output pin among the plurality of output pins are electrically connected to the low-potential voltage source. ### Claim 5 (depends on 1) The touch display device of claim 1, wherein the level shifter is positioned between the touch driving circuit and the plurality of touch electrodes. ### Claim 6 (depends on 4) The touch display device of claim 4, wherein the level shifter generates a level-shifted touch driving signal by shifting the voltage level of the touch driving signal and outputs the level-shifted touch driving signal to the at least one touch pad. ### Claim 7 (depends on 6) The touch display device of claim 6, wherein when a current larger than a selected value flows through any one output pin among the plurality of output pins, a voltage output from the overcurrent detection circuit is varied. ### Claim 8 (depends on 7) The touch display device of claim 7, wherein the level shifter further includes a start signal input pin to which a start signal is input, and wherein the level shifter sequentially outputs the level-shifted touch driving signal from the plurality of output pins after the start signal is input. ### Claim 9 (depends on 8) The touch display device of claim 8, further comprising a level shifter operation control circuit, wherein the level shifter operation control circuit shuts down a level shifting circuit in the level shifter when the voltage output from the overcurrent detection circuit is varied during a unit period between times when the start signal is consecutively input. ### Claim 10 (depends on 3) The touch display device of claim 3, wherein the level shifter further includes a feedback signal output pin that outputs a feedback signal which has a different value when an overcurrent flows through any one output pin among the plurality of output pins than when the overcurrent does not flow through the any one output pin. ### Claim 11 (depends on 10) The touch display device of claim 10, further comprising a touch panel including the X-touch electrode line and the Y-touch electrode line and a plurality of touch lines electrically connected to the X-touch electrode line and the Y-touch electrode line, wherein the feedback signal is a signal associated with at least one of whether the X-touch electrodes included in different X-touch electrode lines are shorted, whether X-touch lines of the plurality of touch lines are shorted, or whether X-touch pads of the at least one touch pad are shorted. ### Claim 12 (depends on 3) The touch display device of claim 3, wherein the overcurrent detection circuit includes: an overcurrent detecting transistor having a gate node electrically connected to at least one output pin among the plurality of output pins; and a comparator that outputs a different voltage when the overcurrent detecting transistor is turned on than when the overcurrent detecting transistor is turned off. ### Claim 13 (depends on 6) The touch display device of claim 6, wherein an amplitude of a post-level shifting touch driving signal is larger than an amplitude of a pre-level shifting touch driving signal. ### Claim 14 (depends on 1) The touch display device of claim 1, wherein the X-touch electrodes have a same shape as each other. ### Claim 15 (depends on 1) The touch display device of claim 1, wherein the Y-touch electrode line has a single bar-shaped structure. ### Claim 16 (depends on 1) The touch display device of claim 1, wherein the Y-touch electrode line has a split two bar-shaped structure. ### Claim 17 (depends on 1) The touch display device of claim 1, wherein the X-touch electrodes positioned on the two opposite sides of the Y-touch electrode line are electrically connected with a connection line. ### Claim 18 (depends on 1) The touch display device of claim 1, wherein an area of the X-touch electrode line is different from an area of the Y-touch electrode line. ### Claim 19 (depends on 18) The touch display device of claim 18, wherein the area of the Y-touch electrode line is smaller than the area of the X-touch electrode line. ### Claim 20 (depends on 19) The touch display device of claim 19, wherein a ratio of the area of the X-touch electrode line to the area of the Y-touch electrode line is in a range of 5:1 to 2:1.