Touch display device, driving circuit and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsWooram Oh, KyungSu Ha
Life of this patent
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Abstract
A touch display device comprises a display panel in which a plurality of touch electrodes including a plurality of X-touch electrodes extending to a first direction and a plurality of Y-touch electrodes extending to a second direction, and a plurality of subpixels are disposed; and a touch driving circuit supplying a touch driving signal to the display panel, sensing a touch by detecting a touch sensing signal, and overlapping with a turn-off section of a first switch transmitting the touch sensing signal and a turn-on section of a second switch resetting the touch sensing signal transmitted through the first switch.
Claims15
A touch display device comprising:
- a display panel in which a plurality of touch electrodes including a plurality of X-touch electrodes extending to a first direction and a plurality of Y-touch electrodes extending to a second direction, and a plurality of subpixels are disposed;
- a touch driving circuit supplying a touch driving signal to the display panel, sensing a touch by detecting a touch sensing signal, and overlapping with a turn-off section of a first switch transmitting the touch sensing signal and a turn-on section of a second switch resetting the touch sensing signal transmitted through the first switch;
- and
- an integrating circuit for generating a sensing output signal,
- wherein the touch driving circuit includes an operational amplifier including an inverting input terminal and a non-inverting input terminal to which a reference voltage is supplied,
- wherein the first switch is connected to the inverting input terminal or the non-inverting input terminal of the operational amplifier according to a turn-on or turn-off operation of the second switch.
A driving circuit of a touch display device for sensing a touch by supplying a touch driving signal to a display panel and detecting a touch sensing signal, comprising:
- a first switch transmitting the touch sensing signal;
- an integrating circuit generating a sensing output signal by integrating a difference between the touch sensing signal and a reference voltage;
- a sample-and-hold circuit sampling the sensing output signal of the integrating circuit and maintaining the sampled voltage;
- and
- an operational amplifier including an inverting input terminal and a non-inverting input terminal to which a reference voltage is supplied,
- wherein a turn-on section of a second switch resetting the integrating circuit overlaps with a turn-off section of the first switch,
- wherein the first switch is connected to the inverting input terminal or the non-inverting input terminal of the operational amplifier according to a turn-on or turn-off operation of the second switch.
A driving method of a touch display device including a display panel in which a plurality of touch electrodes comprised of a plurality of X-touch electrodes extending to a first direction and a plurality of Y-touch electrodes extending to a second direction, and a plurality of subpixels are disposed, and a touch driving circuit supplying a touch driving signal to the display panel and sensing a touch by detecting a touch sensing signal, and including an integrating circuit that generates a sensing output signal and includes an operational amplifier including an inverting input terminal and a non-inverting input terminal to which a reference voltage is supplied, comprising:
- supplying a touch driving signal in a form of a pulse to the display panel;
- transmitting the touch sensing signal generated in the display panel to the touch driving circuit;
- and
- overlapping with a turn-off section of a first switch for transmitting the touch sensing signal to the touch driving circuit and a turn-on section of a second switch resetting the touch sensing signal charged in the touch driving circuit,
- wherein the first switch is connected to the inverting input terminal or the non-inverting input terminal of the operational amplifier according to a turn-on or turn-off operation of the second switch.
Dependencies are inferred from the claim text.