US 2018/0120991 A1 · DRIVING CIRCUIT AND TOUCH DISPLAY DEVICE

Abstract

A touch display device and a driving circuit are disclosed in which the driving circuit is included in the touch display device. The driving circuit may be capable of reducing a chip size and power consumption by configuring an amplifier disposed in an output terminal of a data voltage to be electrically coupled with a feedback capacitor through a switch, and enabling both display driving and touch sensing to be performed through ON/OFF control of the switch. Further, the accuracy and performance of touch sensing may be improved by adjusting an ON/OFF operation of a switch and the number of amplifiers electrically coupled with the feedback capacitor, and a circuit structure for touch driving may be further simplified by generating a load-free driving voltage output in a touch driving period using the amplifiers and a digital-to-analog converter within the driving circuit.

Claims17

Dependent claims

A touch display device comprising:

a touch display panel in which a plurality of gate lines and a plurality of data lines are arranged, a plurality of subpixels are arranged in an area where the gate lines and the data lines intersect, a plurality of touch electrodes are arranged, and a plurality of touch sensing lines electrically coupled with the touch electrodes are arranged;
and
a driving circuit configured to drive the data lines in a display driving period, and drive the touch sensing lines in a touch driving period, the driving circuit further configured to include a plurality of amplifiers having input terminals thereof electrically coupled with an output terminal for outputting an analog voltage, and having output terminals thereof electrically coupled with the data lines, and at least one amplifier among the plurality of amplifiers is electrically coupled with a feedback capacitor electrically coupled with at least one of the touch sensing lines through at least one switch turned on in the touch driving period.

Dependencies are inferred from the claim text.

Driving circuit and touch display device

Life of this patent

Driving circuit and touch display device

Life of this patent

Abstract

Claims17