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US 11,903,296 B2Granted
Input sensing device and display device having the same
AssigneeSamsung Display Co., Ltd.
InventorsIn Nam Lee, Jang Hui Kim, Choon Hyop Lee
Life of this patent
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Abstract
A display device including a display panel including pixels that emit light on a frame basis. An input sensing unit includes driving electrodes and sensing electrodes. A driving signal generator is configured to provide driving signals to the driving electrodes. Analog front-ends are configured to receive sensing signals depending on the driving signals from the sensing electrodes. A signal processor is configured to detect touch input, based on differential output values of the analog front-ends. The driving signal generator provides the driving signals to the driving electrodes while avoiding a period in which a pulse of a vertical synchronization signal defining start of the frame is generated.
Claims20
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.
16 more elements
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,
- wherein:
- the input sensing circuit comprises analog front-ends to receive the sensing signals depending on the driving signals from the electrodes;
- each of the analog front-ends comprises:
- a multiplexer configured to select two sensing signals among sensing signals provided from three adjacent electrodes among the electrodes;
- a charge amplifier configured to output complementary first and second differential signals by differentially amplifying the two sensing signals selected from the sensing signals;
- 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;
- and
- the driving signals are asynchronous with a horizontal synchronization signal.
13 more elements
An input sensing device, comprising:
- an input sensing unit including electrodes;
- and
- an input sensing circuit configured to provide driving signals to the electrodes and receive sensing signals depending on the driving signals from the electrodes to detect a touch input, based on differential output values of analog front-ends, the input sensing circuit comprising 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.
13 more elements
Dependencies are inferred from the claim text.