Touchscreen device and method for controlling the same

摘要

A touchscreen device may include: a panel unit, a driving circuit unit, a sensing circuit unit and a control unit. The control unit may apply a driving signal to a first node capacitor formed at an intersection between a first and a first one of the plurality of sensing electrodes and calibrate gains of the plurality of converter circuit units. Each of the plurality of panel deviation calibration units may calibrate an output signal from the respective one of the plurality of converter circuit units by using a capacitance value of a first capacitor included in the respective one of the plurality of panel deviation calibration units when a driving signal is applied to the first one of the driving electrodes.

主权项

1. A touchscreen device, comprising:
panel unit comprising a plurality of node capacitors formed at intersections between a plurality of driving electrodes and a plurality of sensing electrodes; a driving circuit unit configured to apply a driving signal to each of the plurality of driving electrodes; a sensing circuit unit comprising a plurality of converter circuit units connected to the plurality of sensing electrodes via a switching circuit, and a plurality of panel deviation calibration units, the sensing circuit unit sensing changes in capacitance generated in intersections between the plurality of driving electrodes to which the driving signals are applied and the plurality of sensing electrodes; and a control unit configured to:
control operations of the driving circuit unit and the sensing circuit unit;apply a driving signal to a first node capacitor formed at an intersection between a first driving electrode among the plurality of driving electrodes and a first sensing electrode among the plurality of sensing electrodes; andcalibrate gains of the plurality of converter circuit units so that voltage levels of output signals from the plurality of converter circuit units for the capacitance of the first node capacitor are equal to a predetermined voltage level, wherein each of the plurality of panel deviation calibration units is configured to calibrate an output signal from the respective converter circuit unit among the plurality of converter circuit units by using a capacitance value of a first capacitor included in the respective panel deviation calibration unit among the plurality of panel deviation calibration units, in response to the driving signal being applied to the first driving electrode among the driving electrodes, and wherein the switching circuit comprises:
a plurality of first switches connecting or disconnecting signal transfer paths between the plurality of sensing electrodes and the plurality of converter circuit units;a calibration switch to which terminals of the plurality of sensing electrodes are connected; anda plurality of second switches, each second switch among the second switches having one terminal connected to the respective first switch among the plurality of first switches and having the other terminal connected to the calibration switch.