Touch sensing apparatus and touch sensing method using the same

摘要

A touch sensing apparatus includes a touch screen panel including first electrodes along a first direction and second electrodes along a second direction crossing the first direction to form capacitances with the first electrodes, a driving circuit configured to supply a driving signal to the first electrodes; and a sensing circuit configured to detect output sensing signals from the second electrodes and recognize a touch input based on the output sensing signals. The sensing circuit includes a switching unit configured to modulate the output sensing signals by providing codes as respective input sensing signals to the second electrodes, an amplifying unit configured to amplify the modulated sensing signals, an analog-digital conversion unit configured to convert the amplified sensing signals into digital sensing signals, and a controller configured to demodulate the digital sensing signals and detect a touch input and its position from the demodulated sensing signals.

主权项

1. A touch sensing apparatus comprising:
a touch screen panel comprising driving electrodes along a first direction and sensing electrodes along a second direction crossing the first direction to form capacitances with the driving electrodes; a driving circuit configured to supply a driving signal to the driving electrodes; and a sensing circuit configured to detect output sensing signals from the sensing electrodes and recognize a touch input based on the output sensing signals, wherein the sensing circuit comprises:
a switching unit configured to modulate the output sensing signals from the sensing electrodes by providing codes as respective input sensing signals to the sensing electrodes;an amplifying unit configured to amplify the modulated sensing signals;an analog-digital conversion unit configured to convert the amplified sensing signals into digital sensing signals; anda controller configured to demodulate the digital sensing signals and detect a touch input and its position from the demodulated sensing signals, wherein the switching unit comprises:
first switches respectively coupled between the sensing electrodes and code voltage sources; andsecond switches respectively coupled between the sensing electrodes and the amplifying unit, wherein the amplifying unit comprises:
a number of amplifiers corresponding to a number of groups each comprising ones of the sensing electrodes from which corresponding said output sensing signals are added; andthird switches coupled in parallel with respective said amplifiers, and wherein the first switches and the third switches are configured to turn on concurrently.