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US 2020/0026383 A1Published application
Touch display device, touch circuit, and driving method
AssigneeLG Display Co., Ltd.
InventorsKwangJo HWANG, HwiDeuk LEE, Yangsik LEE
Life of this patent
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Abstract
Discussed is a touch display device having a touch circuit that includes an operational amplifier having a first input terminal for inputting a reference voltage, a second input terminal connected to a sensing target touch electrode, and an output terminal for outputting an output voltage, and wherein a common voltage applied to a common electrode and a reference voltage inputted to the first input terminal of the operational amplifier are synchronized with each other.
Claims31
A touch display device comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch routing lines which are disposed on a substrate, wherein the display panel further includes an active area configured to display an image, and a non-active area which is outer to the active area;
- and
- a touch circuit configured to sense at least one of the plurality of touch electrodes,
- wherein the display panel further includes:
- a plurality of subpixels including a light emitting element including a pixel electrode, a light emitting layer, a common electrode, and a driving transistor to drive the light emitting element;
- and
- an encapsulation layer disposed on the common electrode,
- wherein the plurality of touch electrodes are disposed on the encapsulation layer, and the plurality of touch routing lines are disposed along an inclined surface of the encapsulation layer, and electrically connected to a plurality of touch pads disposed in the non-active area,
- wherein the touch circuit includes an operational amplifier having a first input terminal for inputting a reference voltage, a second input terminal connected to a sensing target touch electrode, and an output terminal for outputting an output voltage, and
- wherein a common voltage applied to the common electrode and the reference voltage inputted to the first input terminal of the operational amplifier are synchronized with each other.
7 more elements
A touch display device comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, a plurality of subpixels and a plurality of touch electrodes;
- and
- a touch circuit configured to sense at least one of the plurality of touch electrodes,
- wherein each of the plurality of subpixels includes a light emitting element including a pixel electrode, a light emitting layer and a common electrode, and a driving transistor to drive the light emitting element,
- wherein the touch circuit includes an operational amplifier having a first input terminal for inputting a reference voltage, a second input terminal connected to a sensing target touch electrode, and an output terminal for outputting a output voltage, and
- wherein the first input terminal of the operational amplifier is electrically connected to the common electrode of the light emitting element.
3 more elements
A driving method of a touch display device, the method comprising:
- detecting a sensing signal from a sensing target touch electrode among a plurality of touch electrodes disposed on a display panel;
- and
- sensing a finger touch or a pen touch based on the sensing signal,
- wherein each of a plurality of subpixels disposed in the display panel includes a light emitting element including a pixel electrode, a light emitting layer, a common electrode, and a driving transistor for driving the light emitting element, and
- wherein when the sensing signal is input to a touch circuit from the sensing target touch electrode, a reference voltage is input to the touch circuit, and the reference voltage is synchronized with a common voltage applied to the common electrode.
2 more elements
A touch circuit comprising:
- an operational amplifier electrically connected to a sensing target touch electrode among a plurality of touch electrodes arranged on a display panel;
- an integrator electrically connected to an output terminal of the operational amplifier;
- and
- an analog-to-digital converter configured to convert an integral value output from the integrator into a digital value,
- wherein the operational amplifier includes a first input terminal for inputting a reference voltage, a second input terminal connected to the sensing target touch electrode, and an output terminal for outputting an output voltage,
- wherein the reference voltage inputted to the first input terminal of the operational amplifier is synchronized with a common voltage applied to the display panel, and
- wherein the common voltage is a voltage applied to a common electrode among a pixel electrode, a light emitting layer, and the common electrode included in a light emitting element in each subpixel arranged in the display panel.
4 more elements
A touch display device comprising:
- a display panel including a plurality of subpixels and a plurality of touch electrodes, wherein each of the plurality of subpixels includes a light emitting element, a common electrode, and a driving transistor to drive the light emitting element;
- and
- a touch circuit configured to sense at least one of the plurality of touch electrodes,
- wherein the touch circuit includes an operational amplifier having a first input terminal for inputting a reference voltage, a second input terminal connected to a sensing target touch electrode, and an output terminal for outputting an output voltage, and
- wherein a common voltage applied to the common electrode and the reference voltage inputted to the first input terminal of the operational amplifier have the same frequency and the same phase.
2 more elements
Dependencies are inferred from the claim text.