TOUCH SCREENS
First Claim
1. A detection system for use with a touch screen having first and second conductive layers operable to be brought together by touching of a user, the system comprising:
- a proximity sensing controller operable to determine a distance between a part of the user and the touch screen prior to the part touching the first conductive layer based on a strength of a proximity signal emanating from the part of the user and received by the first conductive layer; and
a touch screen controller operable to detect a contact position where the part touches the first conductive layer as a function of a first electrical potential occurring prior to the part touching the first conductive layer and at least one of a second and a third electrical potential occurring after the part touches the first conductive layer with enough force to press the first conductive layer against the second conductive layer.
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Accused Products
Abstract
A touch screen control system comprising a touch screen having first and second conductive layers arranged to be brought together by touching of the screen. A detection system is arranged to detect a contact position at which the screen is touched by monitoring electrical signals from at least one of the layers. The system further comprises an antenna, and the detection system includes a proximity sensing signal generator arranged to generate a proximity sensing signal to be transmitted between the antenna and the first layer via a user of the system. The detection system is further arranged to receive the transmitted proximity sensing signal and determine therefrom the distance between a part of the user and the touch screen.
50 Citations
20 Claims
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1. A detection system for use with a touch screen having first and second conductive layers operable to be brought together by touching of a user, the system comprising:
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a proximity sensing controller operable to determine a distance between a part of the user and the touch screen prior to the part touching the first conductive layer based on a strength of a proximity signal emanating from the part of the user and received by the first conductive layer; and a touch screen controller operable to detect a contact position where the part touches the first conductive layer as a function of a first electrical potential occurring prior to the part touching the first conductive layer and at least one of a second and a third electrical potential occurring after the part touches the first conductive layer with enough force to press the first conductive layer against the second conductive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A touch screen comprising:
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first and second layers operable to be brought together by touching of a user; a first switch operable to connected and disconnect one edge of the first layer to a power source; a second switch operable to connected and disconnect one edge of the first layer to ground; a third switch operable to connected and disconnect one edge of the second layer to a power source; a fourth switch operable to connected and disconnect one edge of the second layer to ground; a touch screen controller operable to measure electrical potential between each of the first, second, third, and fourth edges and the corresponding one of the first, second, third, and fourth switches; and wherein the touch screen controller determines a contact position where the first and second layers are brought together as a function of the measured electrical potentials. - View Dependent Claims (16, 17, 18)
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19. A method of controlling a heads-up display (HUD) where information displayed within the HUD is controlled according to user interaction with a touch screen having spaced apart first and second conductive layers, the method comprising:
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operating in a proximity sensing mode where a distance of a part of the user to the touch screen is determined based on a signal transmitted from the part to the first conductive layer; operating in a touch screen mode wherein a contact point at which the part presses the first conductive layer against the second conductive layer is determined, the contact point defined according to an x-coordinate and a y-coordinate, the x-coordinate being determine based on a first electrical potential at one of the first and the second conductive layers and the y-coordinate being determined based on a second electrical potential at the other one of the first and second conductive layers; selectively alternating between the proximity sensing mode and the touch screen mode while the part is within the distance to the touch screen; and operating exclusively according to the proximity sensing mode while the part is beyond the distance to the touch screen. - View Dependent Claims (20)
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Specification