Touch sensing method and touch sensing device for performing the same

A touch sensing method comprising:

• providing each of a plurality of driving electrodes with a plurality of driving signals having different frequencies;
• first amplifying a sensing signal sensed through a plurality of sensing electrodes;
• performing a convolution operation of mixing each of the first amplified sensing signals and a mixing signal having a predetermined frequency;
• second amplifying the sensing signal on which the convolution operation is performed;
• band pass filtering the second amplified sensing signal;
• performing an analog-to-digital conversion of the band pass filtered sensing signal;
• obtaining a real component and an imaginary component for each frequency of the sensed signal through a first half processing of the FFT on the analog-digital converted sensing signal;
• performing a deconvolution operation on the real component and the imaginary component to reconstruct the frequency of the original driving signal;
• obtaining a frequency magnitude of each driving signal through a second half processing of the FFT for the real component and the imaginary component of the recovered frequency;
• and
• determining whether or not a touch is generated based on a variation amount between the obtained frequency magnitude and the frequency magnitude of the driving signal.

A touch sensing device comprising:

• a touch panel in which a plurality of driving electrodes and a plurality of sensing electrodes are disposed;
• and
• a touch sensing controller providing a plurality of driving electrodes with a plurality of driving signals having different frequencies from each other, respectively, and performing a fast Fourier transform (FFT) processing on the sensing signals sensed at each of the sensing electrodes to determine whether or not a touch is generated based on a variation amount between frequency magnitude of the sensing signal and frequency magnitude of the driving signal,
• wherein the touch sensing controller performs a convolution operation of mixing the driving signal or the sensing signal and a mixing signal having a predetermined frequency, and separates the mixing signal from the sensing signal with the convolution operation to determine whether or not a touch is generated by reconstructing an original driving signal.