Two-Level Coding/Decoding-Based Touch Sensing Device and Touch Sensing Method for Mutual Capacitance Touch Sensor
AssigneeLx Semicon Co., Ltd.
InventorMohamed Gamal Ahmed Mohamed
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Abstract
The embodiment applies a two-level coding/decoding technology using a spread spectrum code and an orthogonal code, whereby touch sensing can be robust against noise, a touch sensing time can be reduced, and touch sensitivity can be enhanced.
Claims18
A touch sensing method for mutual capacitance touch sensors formed by multiple transmission electrodes and a reception electrode intersecting each other, the method comprising:
- coding a base signal with a spread spectrum code to generate a spread spectrum signal;
- coding the spread spectrum signal with multiple orthogonal codes, which are orthogonal to each other, to generate multiple driving signals;
- supplying the driving signals to the transmission electrodes, respectively;
- receiving a response signal for the driving signals from the reception electrode;
- converting the response signal into a digital response signal through analog-digital conversion;
- decoding the digital response signal with the orthogonal codes and the spread spectrum code to generate sensing data for each of the touch sensors;
- and
- determining a touch or proximity of an external object to the touch sensors by using the sensing data.
A touch sensing device for mutual capacitance touch sensors formed by multiple transmission electrodes and a reception electrode intersecting each other, the touch sensing device comprising:
- a driving circuit configured to code a base signal with a spread spectrum code to generate a spread spectrum signal, to code the spread spectrum signal with multiple orthogonal codes, which are orthogonal to each other, to generate multiple driving signals, and to supply the driving signals to the transmission electrodes, respectively;
- and
- a sensing circuit configured to receive a response signal for the driving signals from the reception electrode, to convert the response signal into a digital response signal through analog-digital conversion, to decode the digital response signal with the orthogonal codes and the spread spectrum code to generate sensing data for each of the touch sensors, and to determine a touch or proximity of an external object to the touch sensors by using the sensing data.
A touch sensing device for a mutual capacitance touch sensor formed by a reception electrode and a transmission electrode intersecting each other, the touch sensing device comprising:
- a driving circuit configured to supply a pulse signal comprising a high voltage level interval and a low voltage level interval to the transmission electrode;
- and
- a sensing circuit configured to receive a response signal for the pulse signal from the reception electrode, to reverse a part of the response signal, the part corresponding to the high voltage level interval or the low voltage level interval, to convert the response signal into a digital response signal through analog-digital conversion, and to generate sensing data for the touch sensor by using the digital response signal.
Dependencies are inferred from the claim text.