Touch Sensitive Device with Dielectric Layer
First Claim
Patent Images
1. A touch sensitive device comprising:
- a cover layer;
a touch sensor layer; and
a dielectric layer disposed between the cover layer and the touch sensor layer and configured to reduce a capacitance per unit area of the device to less than about 0.0305 picofarads per square millimeter.
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Accused Products
Abstract
A touch sensitive device having a dielectric layer between a cover layer and a touch sensor layer is disclosed. The dielectric layer can reduce a negative pixel effect associated with poor grounding of an object touching the device. The dielectric layer can reduce a capacitance per unit area of the device to less than about 0.0305 picofarads per square millimeter, thereby reducing the negative pixel effect. The dielectric layer can have a thickness of about 0.50 millimeters or more and/or a dielectric constant of about 2.3 or less to reduce the negative pixel effect.
34 Citations
25 Claims
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1. A touch sensitive device comprising:
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a cover layer; a touch sensor layer; and a dielectric layer disposed between the cover layer and the touch sensor layer and configured to reduce a capacitance per unit area of the device to less than about 0.0305 picofarads per square millimeter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch sensitive device comprising:
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a cover layer having a touchable surface; a touch sensor layer; and a dielectric layer having a thickness of about 0.50 millimeters assembled between the cover layer and the touch sensor layer to decrease capacitive coupling between the touch sensor layer and an ungrounded object proximate to the touchable surface. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A touch sensitive device comprising:
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a touch sensor layer configured to sense an object touching the device; and a dielectric layer having a dielectric constant of about 2.3 or less attached over the touch sensor layer to substantially reduce a negative pixel effect in the device that is associated with a grounding condition of the object. - View Dependent Claims (17, 18, 19)
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20. A method comprising:
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providing a dielectric layer between a cover layer and a touch sensor layer of a touch sensitive device; and forming with the dielectric layer a total capacitance per unit area in the device of less than about 0.0305 picofarads per square millimeter. - View Dependent Claims (21, 22, 23)
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- 24. A dielectric layer comprising a dielectric material having a capacitance per unit area of about 0.0407 picofarads per square millimeter, the dielectric layer being configured to contribute to a total capacitance per unit area in a touch sensitive device of less than about 0.0305 picofarads per square millimeter.
Specification