Multipoint touchscreen
First Claim
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1. A touch panel having a transparent capacitive sensing medium configured to detect multiple touches or near touches that occur at a same time and at distinct locations in a plane of the touch panel and to produce distinct signals representative of a location of the touches on the plane of the touch panel for each of the multiple touches;
- wherein the transparent capacitive sensing medium comprises a transparent electrode layer, the electrode layer including a plurality of electrically isolated electrodes and electrode traces formed from a transparent conductive material, each of the electrodes being placed at different locations in the plane of the touch panel, each of the electrodes having an individual trace for operatively coupling to self-capacitance monitoring circuitry.
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Abstract
A touch panel having a transparent capacitive sensing medium configured to detect multiple touches or near touches that occur at the same time and at distinct locations in the plane of the touch panel and to produce distinct signals representative of the location of the touches on the plane of the touch panel for each of the multiple touches is disclosed.
578 Citations
26 Claims
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1. A touch panel having a transparent capacitive sensing medium configured to detect multiple touches or near touches that occur at a same time and at distinct locations in a plane of the touch panel and to produce distinct signals representative of a location of the touches on the plane of the touch panel for each of the multiple touches;
wherein the transparent capacitive sensing medium comprises a transparent electrode layer, the electrode layer including a plurality of electrically isolated electrodes and electrode traces formed from a transparent conductive material, each of the electrodes being placed at different locations in the plane of the touch panel, each of the electrodes having an individual trace for operatively coupling to self-capacitance monitoring circuitry. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display arrangement comprising:
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a display having a screen for displaying a graphical user interface; and a transparent touch panel allowing the screen to be viewed therethrough and capable of recognizing multiple touch events that occur at different locations on the touch panel at a same time and to output touch even information to a host device to form a pixilated image; wherein the touch panel includes a multipoint sensing arrangement configured to simultaneously detect and monitor the touch events and a change in capacitive coupling associated with those touch events at distinct locations across the touch panel; and wherein the multipoint sensing arrangement provides a plurality of transparent self-capacitive sensing nodes that work independent of one another and that represent different locations on the touch panel. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A display arrangement comprising:
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a display having a screen for displaying a graphical user interface; and a transparent touch panel allowing the screen to be viewed therethrough and capable of recognizing multiple touch events that occur at different locations on the touch panel at a same time and to output touch event information to a host device; and wherein the touch panel comprises; a transparent conductive layer including an array of electrically isolated electrodes forming a plurality of transparent self-capacitive sensing nodes configured to simultaneously detect and monitor the touch events and a change in self-capacitive coupling associated with those touch events at distinct locations across the touch panel; and one or more sensor circuits operatively coupled to the electrodes for sensing the self-capacitance of the electrodes, wherein each of the distinct locations represents one of multiple locations along a direction and multiple locations along a second direction corresponding to coordinates in t plane of the touch panel. - View Dependent Claims (15, 16, 17, 18)
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19. A touch panel having a transparent capacitive sensing medium configured to detect multiple touches or near touches that occur at a same time and at distinct locations in a plane of the touch panel and to produce distinct signals representative of a location of the touches on the plane of the touch panel for each of the multiple touches;
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wherein the transparent capacitive sensing medium comprises a transparent electrode layer, the electrode layer including a plurality of electrically isolated electrodes and electrode traces formed from a transparent conductive material, each of the electrodes being placed at different locations in the plane of the touch panel, each of the electrodes operatively coupled to self-capacitance monitoring circuitry, wherein each of the different locations represents one of multiple locations along a first direction and one of multiple locations along a second direction corresponding to coordinates in the plane of the touch panel. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A display arrangement comprising:
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a display having a display screen; and a transparent touch panel allowing the screen to be viewed therethrough and capable of recognizing multiple touch events that occur at different locations on the touch panel at a same time and to output touch event information to a host device; wherein the touch panel includes a multipoint sensing arrangement configured to simultaneously detect and monitor the touch events and a change in self-capacitive coupling associated with those touch events at distinct locations across the touch panel; and further comprising a virtual ground charge amplifier coupled to the touch panel for detecting the touch events on the touch panel, wherein each of the distinct locations represents one of multiple locations along a first direction and multiple locations along a second direction corresponding to coordinates in the plane of the touch panel.
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Specification