MULTIMODE TOUCHSCREEN DEVICE
First Claim
1. A touchscreen device comprising at least one multiplexed touchscreen, control electronics and acquisition and processing electronics, the touchscreen comprising:
- a first rigid substrate comprising a plurality of conducting rows; and
a second flexible substrate comprising a plurality of conducting columns perpendicular to the said rows, the control electronics comprising a first multiplexer addressing the plurality of conducting rows, the acquisition and processing electronics comprising a second multiplexer addressing the plurality of conducting columns, whereinthe control electronics comprises a generator of a high-frequency voltage supplying the first multiplexer in such a way that each row is subjected to an input voltage, andthe acquisition and processing electronics comprises;
a synchronous demodulator operating at the same frequency as the high-frequency voltage generator and delivering a plurality of output voltages on each column; and
means of calculation, storage and checking making it possible to calculate the impedance existing between each output voltage and the input voltage, to store it, to simultaneously determine its resistive and capacitive component, to deduce therefrom the type of action of the user on the touchpad.
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Accused Products
Abstract
The invention provides a touchscreen device including at least one multiplexed touchscreen, control electronics and acquisition and processing electronics, the touchscreen including a first rigid substrate having a plurality of conducting rows, a second flexible substrate having a plurality of conducting columns perpendicular to the rows. The control electronics has a generator of a high-frequency voltage for supplying a first multiplexer for addressing the plurality of conducting rows. The acquisition and processing electronics includes a second multiplexer for addressing the plurality of conducting columns and a synchronous demodulator which operates at the same frequency as the high-frequency voltage generator and delivers a plurality of output voltages on each column and calculation means making it possible to calculate the impedance existing between each output voltage and the input voltage. The acquisition and processing electronics also includes means for analysing the impedance making it possible to calculate its resistive part and its capacitive part.
63 Citations
16 Claims
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1. A touchscreen device comprising at least one multiplexed touchscreen, control electronics and acquisition and processing electronics, the touchscreen comprising:
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a first rigid substrate comprising a plurality of conducting rows; and a second flexible substrate comprising a plurality of conducting columns perpendicular to the said rows, the control electronics comprising a first multiplexer addressing the plurality of conducting rows, the acquisition and processing electronics comprising a second multiplexer addressing the plurality of conducting columns, wherein the control electronics comprises a generator of a high-frequency voltage supplying the first multiplexer in such a way that each row is subjected to an input voltage, and the acquisition and processing electronics comprises; a synchronous demodulator operating at the same frequency as the high-frequency voltage generator and delivering a plurality of output voltages on each column; and means of calculation, storage and checking making it possible to calculate the impedance existing between each output voltage and the input voltage, to store it, to simultaneously determine its resistive and capacitive component, to deduce therefrom the type of action of the user on the touchpad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification