US-12619324-B2 - Touch sensing display apparatus

US12619324B2US 12619324 B2US12619324 B2US 12619324B2US-12619324-B2

Abstract

A touch sensing display device includes a display panel including a plurality of touch blocks which are divided into at least one active touch block and at least one inactive touch block with respect to a touch input position and each touch block provided with a plurality of touch nodes and a plurality of sensing circuits configured to full-sense touch nodes of the active touch block for a first time and half-sense touch nodes of the inactive touch block for a second time, based on a touch driving signal, wherein the first time corresponds to entire pulse periods of the touch driving signal, and the second time corresponds to odd pulse periods or even pulse periods of the touch driving signal.

Inventors

So Jung JUNG

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20241107
Priority Date: 20240124

Claims (11)

1 . A touch sensing display device comprising: a display panel including a plurality of touch blocks including at least one active touch block and at least one inactive touch block with respect to a touch input position, each touch block including a plurality of touch nodes; a plurality of sensing circuits configured to full-sense touch nodes of the active touch block for a first time and half-sense touch nodes of the inactive touch block for a second time, based on a touch driving signal; and a bit shift circuit configured to amplify a half sensing output by two times and store an amplified half sensing output in a buffer, wherein the first time corresponds to an entire pulse period of the touch driving signal, and the second time corresponds to an odd pulse period or an even pulse period of the touch driving signal.
2 . The touch sensing display device of claim 1 , wherein the second time is half of the first time, an active touch block overlaps the touch input position, and the inactive touch block does not overlap the touch input position.
3 . The touch sensing display device of claim 1 , wherein the touch input position is configured to be previously obtained through pre-sensing on all of the plurality of touch blocks.
4 . The touch sensing display device of claim 1 , wherein the plurality of sensing circuits are connected to touch nodes of the active touch block or touch nodes of the inactive touch block, based on a channel multiplexer signal.
5 . The touch sensing display device of claim 4 , wherein the plurality of sensing circuits comprise: odd sensing circuits connected to odd touch nodes of the inactive touch block and configured to be powered on in only odd pulse periods of the touch driving signal; and even sensing circuits connected to even touch nodes of the inactive touch block and configured to be powered on in only even pulse periods of the touch driving signal, and wherein the odd touch nodes and the even touch nodes of the inactive touch block are alternately arranged in a chess board pattern.
6 . The touch sensing display device of claim 5 , wherein the odd sensing circuits are configured to be powered off in even pulse periods of the touch driving signal, and the even sensing circuits are configured to be powered off in odd pulse periods of the touch driving signal.
7 . The touch sensing display device of claim 1 , wherein each of the plurality of sensing circuits comprise: a preamplifier circuit including a first amplifier and a first switch configured to switch a driving power input to the first amplifier; an integral circuit including a second amplifier and a second switch configured to switch a driving power input to the second amplifier; a driving signal generator configured to generate the touch driving signal which is to be supplied to the plurality of touch nodes; and a control signal generator configured to output a switch control signal for simultaneously powering on or off the first and second switches, based on the touch input position and the touch driving signal.
8 . The touch sensing display device of claim 7 , wherein the first and second switches are configured to be powered on in entire pulse periods of the touch driving signal, and the preamplifier and the integral circuit are configured to full-sense the touch nodes of the active touch block for the first time to output a touch sensing accumulated signal of a full level.
9 . The touch sensing display device of claim 7 , wherein the first and second switches are configured to be powered on in only odd pulse periods of the touch driving signal, and the preamplifier and the integral circuit are configured to half-sense the odd touch nodes of the inactive touch block for the second time to output a touch sensing accumulated signal of a half level.
10 . The touch sensing display device of claim 7 , wherein the first and second switches are configured to be powered on in only even pulse periods of the touch driving signal, and the preamplifier and the integral circuit are configured to half-sense the even touch nodes of the inactive touch block for the second time to output a touch sensing accumulated signal of a half level.
11 . The touch sensing display device of claim 3 , wherein the pre-sensing is full node sensing on all touch nodes of the plurality of touch blocks.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of the Korean Patent Application No. 10-2024-0010819 filed on Jan. 24, 2024, which is hereby incorporated by reference as if fully set forth herein. BACKGROUND Technical Field The present disclosure relates to a touch sensing display device. Description of the Related Art Touch sensing display device may recognize a touch input of a user applied to a display panel and may perform various application functions based thereon. Touch sensing display device may include a plurality of touch nodes, which are disposed in a display panel for touch recognition, and a touch circuit which drives the touch nodes. The touch circuit may supply a touch driving signal to the touch nodes and may detect electric charge magnitudes of the touch nodes based on the touch driving signal to calculate touch coordinates corresponding to a touch input. In such touch sensing display device, touch sensing is performed on all touch nodes each time regardless of a region where a touch input occurs currently. BRIEF SUMMARY The present disclosure provides a touch sensing display device which may decrease power consumption. As embodied and broadly described herein, a touch sensing display device includes a display panel including a plurality of touch blocks which are divided into at least one active touch block and at least one inactive touch block with respect to a touch input position and each touch block provided with a plurality of touch nodes and a plurality of sensing circuits configured to full-sense touch nodes of the active touch block for a first time and half-sense touch nodes of the inactive touch block for a second time, based on a touch driving signal, wherein the first time corresponds to entire pulse periods of the touch driving signal, and the second time corresponds to odd pulse periods or even pulse periods of the touch driving signal. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the principle of the disclosure. In the drawings: FIG. 1 is a diagram schematically illustrating a touch sensing display device according to the present disclosure; FIG. 2 is a diagram illustrating a matching configuration between a touch circuit and a touch block according to the present disclosure; FIG. 3 is a diagram illustrating some elements of a touch circuit according to the present disclosure; FIG. 4 is a diagram illustrating an example where a plurality of touch blocks are time-divisionally sensed based on a channel multiplexer signal; FIG. 5 is a diagram illustrating a configuration of a sensing circuit individually connected to each touch node of a touch block; FIG. 6 is a diagram for describing a touch sensing operation of one sensing circuit; FIG. 7 is a diagram illustrating an example where an active touch block and an inactive touch block are differentiated from each other with respect to a touch input position; FIG. 8A is a diagram illustrating a half sensing operation of an odd sensing circuit which is powered on in only odd pulse periods of a touch driving signal; FIG. 8B is a diagram illustrating odd touch nodes of an inactive touch block which are connected to odd sensing circuits and half sensed; FIG. 9A is a diagram illustrating a half sensing operation of an even sensing circuit which is powered on in only even pulse periods of a touch driving signal; FIG. 9B is a diagram illustrating even touch nodes of an inactive touch block which are connected to even sensing circuits and half sensed; FIG. 10 is a diagram illustrating an overall circuit of the present disclosure for amplifying a half sensing output by two times; FIG. 11A is a diagram illustrating a full sensing operation of a sensing circuit which is powered on in entire pulse periods of a touch driving signal; FIG. 11B is a diagram illustrating all touch nodes of an active touch block which is connected to sensing circuits and full-sensed; FIG. 12 is a diagram illustrating a detailed configuration of one sensing circuit; FIG. 13 is a diagram illustrating an example where first and second switches of one sensing circuit are powered on by a first switch control signal in only odd pulse periods of a touch driving signal; FIG. 14 is a diagram illustrating an example where first and second switches of one sensing circuit are powered on by a second switch control signal in only even pulse periods of a touch driving signal; FIG. 15 is a diagram illustrating an example where first and second switches of one sensing circuit are powered on by a third switch control signal in entire pulse periods of a touch driving signal; and FIG. 16 is a diagram illustrating a sensing sequence according to the present disclosure. DETAILED DESCRIPTION Herei