Integrated touch and display architectures for self-capacitive touch sensors
First Claim
1. An organic light emitting diode touch sensitive display including a plurality of display pixels, the display comprising:
- an electrode layer including a plurality of self-capacitance touch sensor electrodes, wherein each of the plurality of self-capacitance touch sensor electrodes is electrically isolated from others of the plurality of self-capacitance touch sensor electrodes;
a cathode layer that is coupled to AC ground during a touch detection mode of the display and is configured to reduce a parasitic capacitance effect on the plurality of self-capacitance touch sensor electrodes, wherein the parasitic capacitance effect includes an effect from capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer, and reducing the parasitic capacitance effect includes reducing the capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer;
an anode layer;
an organic layer, the organic layer including a plurality of organic light emitting diodes; and
an encapsulation layer disposed between the cathode layer and the electrode layer.
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Abstract
A self-capacitive touch sensor panel configured to have a portion of both the touch and display functionality integrated into a common layer is provided. The touch sensor panel includes a layer with circuit elements that can switchably operate as both touch circuitry and display circuitry such that during a touch mode of the device the circuit elements operate as touch circuitry and during a display mode of the device the circuit elements operate as display circuitry. The touch mode and display mode can be time multiplexed. By integrating the touch hardware and display hardware into common layers, savings in power, weight and thickness of the device can be realized.
344 Citations
15 Claims
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1. An organic light emitting diode touch sensitive display including a plurality of display pixels, the display comprising:
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an electrode layer including a plurality of self-capacitance touch sensor electrodes, wherein each of the plurality of self-capacitance touch sensor electrodes is electrically isolated from others of the plurality of self-capacitance touch sensor electrodes; a cathode layer that is coupled to AC ground during a touch detection mode of the display and is configured to reduce a parasitic capacitance effect on the plurality of self-capacitance touch sensor electrodes, wherein the parasitic capacitance effect includes an effect from capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer, and reducing the parasitic capacitance effect includes reducing the capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer; an anode layer; an organic layer, the organic layer including a plurality of organic light emitting diodes; and an encapsulation layer disposed between the cathode layer and the electrode layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating an organic light emitting diode touch sensitive display including a plurality of display pixels, the method comprising:
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providing; an electrode layer including a plurality of self-capacitance touch sensor electrodes, wherein each of the plurality of self-capacitance touch sensor electrodes is electrically isolated from others of the plurality of self-capacitance touch sensor electrodes; an anode layer; an organic layer, the organic layer including a plurality of organic light emitting diodes; and an encapsulation layer disposed between a cathode layer and the electrode layer; and coupling the cathode layer to AC ground during a touch detection mode of the display, wherein the cathode layer is configured to reduce a parasitic capacitance effect on the plurality of self-capacitance touch sensor electrodes, wherein the parasitic capacitance effect includes an effect from capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer, and reducing the parasitic capacitance effect includes reducing the capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer. - View Dependent Claims (7, 8, 9, 10)
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11. An electronic device comprising:
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a processor; memory; and an organic light emitting diode touch sensitive display including a plurality of display pixels, the display comprising; an electrode layer including a plurality of self-capacitance touch sensor electrodes, wherein each of the plurality of self-capacitance touch sensor electrodes is electrically isolated from others of the plurality of self-capacitance touch sensor electrodes; a cathode layer that is coupled to AC ground during a touch detection mode of the display and is configured to reduce a parasitic capacitance effect on the plurality of self-capacitance touch sensor electrodes, wherein the parasitic capacitance effect includes an effect from capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer, and reducing the parasitic capacitance effect includes reducing the capacitive coupling between the plurality of self-capacitance touch sensor electrodes and the cathode layer; an anode layer; an organic layer, the organic layer including a plurality of organic light emitting diodes; and an encapsulation layer disposed between the cathode layer and the electrode layer. - View Dependent Claims (12, 13, 14, 15)
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Specification