Input sensing device and display device including the same

A display device, comprising:

• a display panel that includes pixels;
• first driving electrodes, second driving electrodes, and sensing electrodes disposed on the display panel;
• and
• a sensing driver that transmits a first driving signal to the first driving electrodes at a first frequency, transmits a second driving signal to the second driving electrodes at a second frequency, and determine a touch or approach of an external object based on sensing signals received from the sensing electrodes,
• wherein the sensing driver comprises analog front-end circuits that separate a sensing signal of the first frequency and a sensing signal of the second frequency that are received from the respective sensing electrodes, and generate digital sensing data based on a result of recombining the separated sensing signals, and
• wherein a frequency of the sensing signal that is received from each of the sensing electrodes varies in response to the first driving signal and the second driving signal.

An input sensing device, comprising:

• a sensing driver that includes analog front-end circuits that separate sensing signals of different frequencies that are received from sensing electrodes, and generates digital sensing data based on a result of a recombination of the separated sensing signals,
• wherein each of the analog front-end circuits comprises:
• a charge amplification component that differentially amplifies a first sensing signal and a second sensing signal that are respectively received by a first input terminal and a second input terminal, and outputs a first differential signal and a second differential signal through a first output terminal and a second output terminal, respectively;
• a filter component that filters the first differential signal and outputs a first filtered signal and a second filtered signal in different frequency bands, and filters the second differential signal and outputs a third filtered signal and a fourth filtered signal in different frequency bands;
• a buffer component that outputs a first combined differential signal and a second combined differential signal based on the first to fourth filtered signals;
• and
• an analog-to-digital converter that outputs digital sensing data in response to the first combined differential signal and the second combined differential signal.