DEVICE AND METHOD FOR CONTROL INTERFACE SENSITIVE TO A MOVEMENT OF A BODY OR OF AN OBJECT AND VIEWING SCREEN INTEGRATING THIS DEVICE
First Claim
1. A device for sensing proximity or contact of an object, comprising:
- a detection surface;
a plurality of capacitive sensors disposed in proximity to the detection surface;
a guard of electrically conducting material disposed in proximity to the plurality of capacitive sensors; and
excitation and measurement electronics electrically coupled to the plurality of capacitive sensors and the guard, and at least partially referenced to a guard potential different from a ground potential;
wherein the excitation and measurement electronics are configured forproviding a first potential to an interrogated capacitive sensor, the first potential referenced to the guard potential and different from the ground potential,providing a second potential to the guard, the second potential indirectly coupled to the first potential,providing a third potential to the plurality of capacitive sensors other than the interrogated capacitive sensor, the third potential indirectly coupled to the first potential, andprocessing signals emanating from the interrogated capacitive sensor to provide distance information between the detection surface and the object.
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Accused Products
Abstract
A device for control interface sensitive to movement of a body, includes a detection surface; at least one capacitive sensor including a measurement electrode including an active surface facing the detection surface, or substantially coinciding with the detection surface; electronic excitation and processing components for exciting the measurement electrodes at an alternating electrical potential and processing the signals emanating from the capacitive sensors, to provide distance information between the active surface of the electrodes and one or several objects; a guard of electrically conducting material disposed in proximity to the measurement electrodes, at least along the face of the measurement electrodes substantially opposite to the active surface, which guard is excited at an alternating electrical potential substantially identical to the alternating electrical potential of the measurement electrodes, wherein: the measurement electrodes and the guard are made of substantially transparent conducting materials; and the device for interface is substantially transparent.
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Citations
20 Claims
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1. A device for sensing proximity or contact of an object, comprising:
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a detection surface; a plurality of capacitive sensors disposed in proximity to the detection surface; a guard of electrically conducting material disposed in proximity to the plurality of capacitive sensors; and excitation and measurement electronics electrically coupled to the plurality of capacitive sensors and the guard, and at least partially referenced to a guard potential different from a ground potential; wherein the excitation and measurement electronics are configured for providing a first potential to an interrogated capacitive sensor, the first potential referenced to the guard potential and different from the ground potential, providing a second potential to the guard, the second potential indirectly coupled to the first potential, providing a third potential to the plurality of capacitive sensors other than the interrogated capacitive sensor, the third potential indirectly coupled to the first potential, and processing signals emanating from the interrogated capacitive sensor to provide distance information between the detection surface and the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for sensing proximity of contact of an object, comprising:
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providing a first potential to an interrogated capacitive sensor within a plurality of capacitive sensors, the first potential referenced to a guard potential and different from a ground potential, providing a second potential to a guard disposed in proximity to the plurality of capacitive sensors, the second potential indirectly coupled to the first potential, providing a third potential to the plurality of capacitive sensors other than the interrogated capacitive sensor, the third potential indirectly coupled to the first potential, and processing signals emanating from the interrogated capacitive sensor to provide distance information between a detection surface and the object, the processing of the signals performed with reference to the guard potential. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification