Patent ID: 11903296
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A display device, comprising:
a display panel including pixels that emit light on a frame basis;
an input sensing unit including electrodes;
an input sensing circuit configured to provide driving signals to the electrodes and configured to receive sensing signals depending on the driving signals from the electrodes to detect a touch input, the input sensing circuit comprising:
analog front-ends to receive the sensing signals depending on the driving signals from the electrodes; and
a distribution circuit disposed between at least some of the electrodes and the analog front-ends, respectively, and configured to receive each of the sensing signals provided from at least some of the electrodes and provide signals equal in intensity to each other to two adjacent analog front-ends among the analog front-ends,

wherein:
each of the analog front-ends comprises:
a charge amplifier configured to output complementary first and second differential signals by differentially amplifying a first sensing signal and a second sensing signal that are provided from two adjacent electrodes, respectively, among the electrodes;
a band pass filter configured to output a first filtered signal and a second filtered signal by filtering the first differential signal and the second differential signal, respectively;
a mixer configured to output a first demodulated signal and a second demodulated signal by changing frequencies of the first filtered signal and the second filtered signal, respectively;
a low pass filter configured to output a first output signal and a second output signal by filtering noise from each of the first demodulated signal and the second demodulated signal; and
an analog-to-digital converter configured to output a differential output value corresponding to a difference between the first output signal and the second output signal;

each of the driving signals has a sine wave shape;
the driving signals are asynchronous with a horizontal synchronization signal;
the input sensing circuit simultaneously provides the driving signals to the electrodes; and
two of the driving signals having a same waveform and a same phase are simultaneously provided to one electrode of the electrodes and another electrode of the electrodes.