Touch display device, touch circuit, and touch sensing method
AssigneeLG Display Co., Ltd.
InventorsHoonBae Kim, CheolSe Kim, SunYeop Kim
Life of this patent
Estimating the term…
Abstract
Embodiments of the present disclosure relate to a touch display device, a touch circuit, and a touch sensing method. More particularly, by performing differential sensing on touch electrodes, noise components which the touch electrodes receive from display electrodes (e.g., data line, gate line, etc.) may be removed to accurately sense a touch, so that display driving and touch sensing may be normally performed simultaneously. In this manner, the display driving and the touch sensing may be normally performed simultaneously, thereby enabling implementation of a high-resolution display.
Claims25
A touch display device comprising:
- a display panel comprising a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines that are electrically connected to the plurality of touch electrodes;
- and
- a touch circuit configured to supply a touch driving signal to the plurality of touch electrodes via the plurality of touch lines during a display driving period of the touch display device at which data voltages are applied to the plurality of data lines for displaying an image, and detect a presence or an absence of a touch of the touch display device based on sensing data including a value corresponding to a difference between a first sensing signal received from a first touch electrode from the plurality of touch electrodes and a second sensing signal received from a second touch electrode from the plurality of touch electrodes responsive to the touch driving signal,
- wherein the supplying of the touch driving signal to the plurality of touch electrodes and the applying of the data voltages to the plurality of data lines are simultaneously performed in at least one active time in a frame time including one or more active times and one or more blank times.
A touch circuit that senses touch on a display panel that comprises a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines that are electrically connected to the plurality of touch electrodes, the touch circuit configured to supply a touch driving signal to the plurality of touch electrodes via the plurality of touch lines during a display driving period of the touch display device at which data voltages are applied to the plurality of data line for displaying an image, the touch circuit comprising:
- a differential amplifier configured to output an output signal indicative of a presence or absence of touch of the display panel based on a difference between a first sensing signal received from a first touch electrode of the plurality of touch electrodes through a first touch line from the plurality of touch lines and a second sensing signal received from a second touch electrode of the plurality of touch electrodes through a second touch line of the plurality of touch lines,
- wherein the supplying of the touch driving signal to the plurality of touch electrodes and the applying of the data voltages to the plurality of data lines are simultaneously performed in at least one active time in a frame time including one or more active times and one or more blank times.
A touch sensing method of 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 lines electrically connected to the plurality of touch electrodes, the touch sensing method comprising:
- supplying a touch driving signal to the plurality of touch electrodes via the plurality of touch lines during a display driving period of the touch display device at which data voltages are applied to the plurality of data line for displaying an image;
- receiving a first sensing signal from a first touch electrode of the plurality of touch electrodes through a first touch line of the plurality of touch lines;
- receiving a second sensing signal from a second touch electrode of the plurality of touch electrodes through a second touch line of the plurality of touch lines;
- generating an output signal based on a difference between the first sensing signal and the second sensing signal;
- and
- detecting a presence or an absence of touch of the touch display device based on the output signal,
- wherein the supplying of the touch driving signal to the plurality of touch electrodes and the applying of the data voltages to the plurality of data lines are simultaneously performed in at least one active time in a frame time including one or more active times and one or more blank times.
Dependencies are inferred from the claim text.