MULTIPOINT TOUCHSCREEN
First Claim
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1. A touch screen method comprising:
- providing a touch screen having a transparent capacitive sensing medium, the transparent capacitive sensing medium including a first layer having a plurality of first conductive lines that are electrically isolated from one another and formed from a transparent conductive material and a second layer spatially separated from the first layer and having a plurality of second conductive lines that are electrically isolated from one another and formed from a transparent conductive material, the plurality of second conductive lines crossing the plurality of first conductive lines at sensing points positioned at different locations in the plane of the touch screen;
driving the plurality of sensing points of the touch screen using the plurality of first conductive lines;
reading outputs from the plurality of sensing points using the plurality of second conductive lines;
producing and analyzing images of the touch screen plane at different moments in time in order to determine touch events when objects touch the touch screen; and
comparing a current image to a past image in order to determine a change in touch events.
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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.
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Citations
21 Claims
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1. A touch screen method comprising:
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providing a touch screen having a transparent capacitive sensing medium, the transparent capacitive sensing medium including a first layer having a plurality of first conductive lines that are electrically isolated from one another and formed from a transparent conductive material and a second layer spatially separated from the first layer and having a plurality of second conductive lines that are electrically isolated from one another and formed from a transparent conductive material, the plurality of second conductive lines crossing the plurality of first conductive lines at sensing points positioned at different locations in the plane of the touch screen; driving the plurality of sensing points of the touch screen using the plurality of first conductive lines; reading outputs from the plurality of sensing points using the plurality of second conductive lines; producing and analyzing images of the touch screen plane at different moments in time in order to determine touch events when objects touch the touch screen; and comparing a current image to a past image in order to determine a change in touch events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 21)
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15. An electronic device incorporating a display and a touch screen comprises:
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a transparent capacitive sensing medium, the transparent capacitive sensing medium including a first layer having a plurality of first conductive lines that are electrically isolated from one another and formed from a transparent conductive material and a second layer spatially separated from the first layer and having a plurality of second conductive lines that are electrically isolated from one another and formed from a transparent conductive material, the plurality of second conductive lines crossing the plurality of first conductive lines at sensing points positioned at different locations in the plane of the touch screen; a voltage source configured to drive the plurality of sensing points of the touch screen using the plurality of first conductive lines; a sensing circuit for reading outputs from the plurality of second conductive lines connected to the sensing points; a processor coupled to the sensing circuit for producing and analyzing images of the touch screen plane at different moment in time in order to determine touch events when objects touch the touch screen and for comparing the current image to a past image in order to determine a change in touch events. - View Dependent Claims (16, 17, 18, 19)
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Specification