Yao Weijun,Al-Dahle Ahmad,Li Yingxuan,Yao Wei Hsin
申请号：
US201314059411
公开号：
US9678609(B2)
申请日:
2013.10.21
申请国别(地区):
美国
年份:
2017
代理人:
Morrison & Foerster LLP
摘要：
Systems and processes for stimulating a touch sensor panel using orthogonal frequencies are provided. In one example process, the drive lines of the touch sensor panel can be stimulated with stimulation signals having orthogonal frequencies. The orthogonal frequencies can be separated by a frequency that is inversely proportional to an integration time of the touch sensor panel. The touch signals generated in response to the stimulation signals can be amplified, converted into digital form, demodulated using the orthogonal frequencies, and integrated over the integration time. Integrating the demodulated signals over a length of time that is inversely proportional to the frequency spacing between the orthogonal frequencies reduces or eliminates interference in the touch signals caused by the stimulation signals having different frequencies.
