Touch sensor chip, touch sensing apparatus including the same, and method of controlling noise of touch panel

摘要

Provided are a touch sensor chip, a touch sensing apparatus including the same, and a method of controlling noise of a touch panel. The touch sensing apparatus includes: an electronic device which is driven by a clock signal; a touch panel which is placed adjacent to the electronic device and receives a touch signal; and a touch sensor chip which transmits a driving signal to the touch panel and hops a frequency of the driving signal by a hopping interval if a noise level at the frequency of the driving signal is equal to or higher than a noise threshold, wherein the hopping interval is set based on an exciting frequency of the touch sensor chip.

主权项

1. A touch sensing apparatus comprising:
an electronic device which is driven by a clock signal; a touch panel which is placed adjacent to the electronic device and receives a touch signal; and a touch sensor chip which calculates a noise level at the frequency of a driving signal and transmits the driving signal to the touch panel and hops a frequency of the driving signal by a hopping interval if the noise level at the frequency of the driving signal is equal to or higher than a noise threshold, wherein the hopping interval is set based on an exciting frequency of the touch sensor chip, wherein the hopping interval is smaller than a frequency of the clock signal of the electronic device; wherein a first frequency of the driving signal before a hopping and a second frequency of the driving signal after the hopping are located within one period of a noise signal, wherein the touch sensor chip selects a direction of either a positive direction or a negative direction and performs frequency hopping by the hopping interval in the selected direction, wherein the touch sensor chip performs the frequency hopping in the other direction from the selected direction, if a predetermined limit is reached in the selected direction and if the noise level is above the noise threshold.