Touchscreen display device, touch driving circuit and pen touch sensing method
AssigneeLG Display Co., Ltd.
InventorsHoonBae Kim, SungChul Kim, SunYeop Kim, Seongkyu Kang
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Abstract
Provided are a touchscreen display device, a touch driving circuit, and a pen touch sensing method. Sensing processing on a pen signal is performed in a different manner, depending on whether or not a gate line, through which a gate signal having a variable voltage is applied, overlaps with a common electrode selected as a sensing target. Even in the case in which an abnormal noise voltage is induced in the common electrode by panel interior noise while pen touch sensing is being performed during display driving, pen touch sensitivity is prevented from being reduced.
Claims20
A touchscreen display device comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of common electrodes, wherein each common electrode among the plurality of common electrodes overlaps with one or more data lines among the plurality of data lines and one or more gate lines among the plurality of gate lines;
- and
- a touch driving circuit, during a pen touch sensing period simultaneous with display driving, configured to drive all or some of the plurality of common electrodes, receive a pen signal output from a pen through a target common electrode selected as a sensing target from among the plurality of common electrodes, perform sensing processing on the pen signal in a different manner, depending on whether or not a gate line through which a gate signal having a variable voltage is applied, from among the plurality of gate lines, overlaps with the target common electrode;
- and generate and output sensing data according to a result of the sensing processing.
A touch driving circuit of a touchscreen display device, wherein the touchscreen display device includes a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of common electrodes, wherein each common electrode among the plurality of common electrodes overlaps with one or more data lines among the plurality of data lines and one or more gate lines among the plurality of gate lines, the touch driving circuit comprising:
- a sensing circuit, wherein, during a pen touch sensing period simultaneous with display driving, the sensing circuit is configured to drive all or some of the plurality of common electrodes;
- receive a pen signal output from a pen through a target common electrode selected as a sensing target from among the plurality of common electrodes;
- and perform sensing processing on the pen signal in a different manner, depending on whether or not a gate line through which a gate signal having a variable voltage is applied, from among the plurality of gate lines, overlaps with the target common electrode;
- and
- an output circuit configured to generate and output sensing data according to a result of the sensing processing.
A pen touch sensing method of a touchscreen display device, wherein the touchscreen display device includes a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of common electrodes, wherein each common electrode among the plurality of common electrodes overlaps with one or more data lines among the plurality of data lines and one or more gate lines among the plurality of gate lines, the pen touch sensing method comprising:
- driving all or some of the plurality of common electrodes during a pen touch sensing period simultaneous with display driving;
- sensing a pen signal by receiving the pen signal output from a pen through a target common electrode selected as a sensing target from among the plurality of common electrodes, performing sensing processing on the pen signal in a different manner, depending on whether or not a gate line through which a gate signal having a variable voltage level is applied, from among the plurality of gate lines, overlaps with the target common electrode, and generating sensing data according to a result of the sensing processing;
- and
- detecting one or more of a position, a tilt, and pen information of the pen in accordance with the sensing data.
Dependencies are inferred from the claim text.