Ground Guard for Capacitive Sensing
First Claim
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1. A capacitive touch sensor panel, comprising:
- a plurality of sense lines formed on a single layer and supported on one side of a substrate;
a plurality of drive lines formed on the same side of the substrate as the plurality of sense lines, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and
one or more ground guards formed adjacent to one or more of the sense lines for shunting electric field lines that would otherwise couple stray capacitance onto the sense lines.
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Abstract
A touch sensor panel is disclosed including the use of ground guards or ground isolation bars to improve the touch event detection capabilities of the touch sensor panel. Ground isolation bars can be formed between connecting traces and adjacent sense lines to shunt near-field lines to ground and reduce unwanted capacitive coupling between the connecting traces and the sense lines. Ground guards can be formed between the drive and sense lines to partially or fully surround a sense line and shunt near-field lines to ground and improve the touch event detection capabilities of the sensor.
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Citations
20 Claims
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1. A capacitive touch sensor panel, comprising:
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a plurality of sense lines formed on a single layer and supported on one side of a substrate; a plurality of drive lines formed on the same side of the substrate as the plurality of sense lines, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and one or more ground guards formed adjacent to one or more of the sense lines for shunting electric field lines that would otherwise couple stray capacitance onto the sense lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for improving a touch detection capability of a capacitive touch sensor panel having a plurality of drive lines and a plurality of sense lines formed on a same side of a single substrate, comprising:
protecting one or more of the sense lines with one or more ground guards formed adjacent to the one or more sense lines, the ground guards for shunting electric field lines that would otherwise couple stray capacitance onto the one or more sense lines. - View Dependent Claims (10, 11, 12, 13)
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14. A method for improving a touch detection capability of a capacitive touch sensor panel having a plurality of drive lines and a plurality of sense lines formed on a same side of a single substrate, comprising:
providing one or more paths to ground adjacent to one or more of the sense lines for shunting electric field lines that would otherwise couple stray capacitance onto the one or more sense lines. - View Dependent Claims (15, 16, 17, 18)
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19. A mobile telephone including a touch sensor panel, the touch sensor panel comprising:
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a plurality of sense lines formed on a single layer and supported on one side of a substrate; a plurality of drive lines formed on the same side of the substrate as the plurality of sense lines, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and one or more ground guards formed adjacent to one or more of the sense lines for shunting electric field lines that would otherwise couple stray capacitance onto the sense lines.
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20. A media player including a touch sensor panel, the touch sensor panel comprising:
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a plurality of sense lines formed on a single layer and supported on one side of a substrate; a plurality of drive lines formed on the same side of the substrate as the plurality of sense lines, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and one or more ground guards formed adjacent to one or more of the sense lines for shunting electric field lines that would otherwise couple stray capacitance onto the sense lines.
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Specification