Hybrid Capacitive Touch Screen Element
First Claim
1. A touch sensitive position sensor comprising:
- a substrate defining a touch sensitive platform;
first and second resistive bus-bars arranged spaced apart on the substrate; and
a conductive sensing area provided between the bus-bars and comprising first and second conductive elements connected to the first and second resistive bus-bars respectively and spaced apart from each other by non-conducting gaps, so that currents induced in the conductive sensing area flow towards the bus-bars, but are prevented from flowing in a direction parallel to the bus-bars.
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Accused Products
Abstract
A capacitive touch sensitive position sensor is provided which has a substrate defining a touch sensitive platform. First and second resistive bus-bars arranged spaced apart on the substrate. A conductive sensing area is formed between the bus bars and is constructed with first and second conductive elements connected to the first and second resistive bus-bars respectively, and spaced apart from each other by non-conducting gaps, so that currents induced in the conductive sensing area flow towards the bus-bars, but are prevented from flowing in a direction parallel to the bus-bars. This design removes pin-cushion distortion and enhances linearization of the output signals. Because the sensing region is not galvanically coupled from one bus bar to the other, the voltage gradients remain uniform and undistorted. Capacitive coupling from one side to the other does not produce a distortion component provided that the capacitance is allowed to fully charge and discharge across all locations in the sensing region.
249 Citations
15 Claims
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1. A touch sensitive position sensor comprising:
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a substrate defining a touch sensitive platform; first and second resistive bus-bars arranged spaced apart on the substrate; and a conductive sensing area provided between the bus-bars and comprising first and second conductive elements connected to the first and second resistive bus-bars respectively and spaced apart from each other by non-conducting gaps, so that currents induced in the conductive sensing area flow towards the bus-bars, but are prevented from flowing in a direction parallel to the bus-bars. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A control panel incorporating a touch sensitive position sensor comprising:
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a substrate defining a touch sensitive platform; first and second resistive bus-bars arranged spaced apart on the substrate; and a conductive sensing area provided between the bus-bars and comprising first and second conductive elements connected to the first and second resistive bus-bars respectively, and spaced apart from each other by non-conducting gaps, so that currents induced in the conductive sensing area flow towards the bus-bars, but are prevented from flowing in a direction parallel to the bus-bars.
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14. An apparatus having a control panel incorporating a touch sensitive position sensor comprising:
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a substrate defining a touch sensitive platform; first and second resistive bus-bars arranged spaced apart on the substrate; and a conductive sensing area provided between the bus-bars and comprising first and second conductive elements connected to the first and second resistive bus-bars respectively, and spaced apart from each other by non-conducting gaps, so that currents induced in the conductive sensing area flow towards the bus-bars, but are prevented from flowing in a direction parallel to the bus-bars.
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15. A touch sensitive position sensor for detecting the position of an object in two dimensions, wherein the position sensor has first and second resistive bus-bars separated by a sensing area, the sensing area comprising multiple interleavings of conductive material arranged between the bus-bars such that the interleavings are connected to one or the other bus-bar but not both, so that induced electric currents flow preferentially towards the bus-bars, the bus-bars being galvanically isolated from each other within the sensing area.
Specification