Touch sensitive display device
First Claim
Patent Images
1. A touch sensor, comprising:
- a display device having a first substrate on which at least one display electrode is disposed, and a second substrate on which at least one display electrode is disposed, for the display of a shape on the display device;
an interface coupled to the at least one display electrode on the first substrate for receiving display data to the display device, the display data providing a voltage value between the at least one display electrode on the first substrate and the at least one display electrode on the second substrate;
a measuring circuit coupled to the at least one display electrode on the first substrate; and
switching means for connecting the interface to the at least one display electrodes on the first and second substrates when the switching means is in a first state of operation and for connecting the measuring circuit to the at least one display electrode on the first substrate when the switching means is in a second state of operation, wherein;
the measuring circuit is configured to detect a change in capacitance or resistance measured at the at least one display electrode on the first substrate; and
the switching means is configured to preserve the voltage value between the at least one display electrode on the first substrate and the at least one display electrode on the second substrate when the switching means is in the second state of operation.
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Abstract
A touch sensor is disclosed comprising a display device having a substrate on which substrate at least one display electrode is disposed for the display of a shape on the display device. An interface is coupled to the at least one display electrode for receiving display data to the display device. Moreover is a measuring circuit coupled to the at least one display electrode. Switching means are provided for connecting the interface to the at least one display electrode when the switching means is in a first state of operation and connecting the measuring circuit to the at least one display electrode when the switching means is in a second state of operation.
97 Citations
15 Claims
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1. A touch sensor, comprising:
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a display device having a first substrate on which at least one display electrode is disposed, and a second substrate on which at least one display electrode is disposed, for the display of a shape on the display device; an interface coupled to the at least one display electrode on the first substrate for receiving display data to the display device, the display data providing a voltage value between the at least one display electrode on the first substrate and the at least one display electrode on the second substrate; a measuring circuit coupled to the at least one display electrode on the first substrate; and switching means for connecting the interface to the at least one display electrodes on the first and second substrates when the switching means is in a first state of operation and for connecting the measuring circuit to the at least one display electrode on the first substrate when the switching means is in a second state of operation, wherein; the measuring circuit is configured to detect a change in capacitance or resistance measured at the at least one display electrode on the first substrate; and the switching means is configured to preserve the voltage value between the at least one display electrode on the first substrate and the at least one display electrode on the second substrate when the switching means is in the second state of operation. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15)
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7. A method for detecting a touch on a display device, said display device having a first substrate on which at least one display electrode is disposed and a second substrate on which at least one display electrode is disposed, for the display of a shape on the display device, wherein said display electrodes are coupled to an interface for receiving display data to the display device, comprising the steps of:
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disconnecting the at least one display electrode on the first and second substrate from the interface; connecting said display electrode on the first substrate to a measuring circuit; and detecting, by the measuring circuit, a change in a capacitance or resistance of the at least one display electrode on the first substrate due to an electrical coupling with an object touching the display device in the vicinity of the display electrode on the first substrate, wherein the at least one display electrode on the second substrate is connected such that a voltage level between the at least one display electrode on the first substrate and the at least one display electrode on the second substrate is preserved. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification