US 2022/0019331 A1 · TOUCH SENSING DEVICE FOR COMPENSATING FOR PHASE ERROR OF ACTIVE PEN AND METHOD THEREOF

Abstract

A touch sensing device that compensates for a phase error of a downlink signal transmitted/received between a display device and an active pen. The touch sensing device includes a differential amplifier configured to amplify a difference between a first accumulated capacitance value for a first touch group and a second accumulated capacitance value for a second touch group, based on a first downlink signal generated during a pre-driving section, an ADC configured to convert an output signal of the differential amplifier into digital data, and a phase error compensator configured to detect an edge of the first downlink signal based on a difference value between current and previous values of the digital data and compensate for a phase error of the first downlink signal using the edge of the first downlink signal and an edge of an internal timing signal.

Claims20

Dependent claims

A touch sensing device that compensates for a phase error of an active pen, the touch sensing device comprising:

a differential amplifier configured to amplify a difference between a first accumulated capacitance value, which is obtained from a first touch group, and a second accumulated capacitance value, which is obtained from a second touch group, on the basis of a first downlink signal generated by the active pen during a pre-driving section;
an analog-to-digital converter (ADC) configured to convert an output signal of the differential amplifier into digital data;
and
a phase error compensator configured to detect an edge of the first downlink signal on the basis of a difference value between current and previous values of the digital data output from the ADC and compensate for a phase error of the first downlink signal by comparing the edge of the first downlink signal with an edge of an internal timing signal.

1 more element

A method of compensating for a phase error of an active pen, the method comprising:

amplifying a difference between a first accumulated capacitance value, which is obtained from a first touch group, and a second accumulated capacitance value, which is obtained from a second touch group, on the basis of a first downlink signal received from the active pen during a pre-driving section;
converting the amplified difference into digital data according to a predetermined sampling period;
detecting an edge of the first downlink signal on the basis of a difference value between current and previous values of the digital data;
detecting a phase error of the first downlink signal by comparing the edge of the first downlink signal with an edge of an internal timing signal;
and
compensating for the phase error by adjusting the internal timing signal according to the phase error.

3 more elements

Dependencies are inferred from the claim text.

Touch sensing device for compensating for phase error of active pen and method thereof

Life of this patent

Touch sensing device for compensating for phase error of active pen and method thereof

Life of this patent

Abstract

Claims20