Projected capacitance touch panel with reference and guard electrode
First Claim
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1. A mutual capacitance touch panel device, comprising:
- a substrate;
an array of electrode elements formed on the substrate, each electrode element including a drive electrode, a sense electrode and a reference electrode, the reference electrode arranged between the drive electrode and the sense electrode;
a first mutual coupling capacitance formed between the drive electrode and the reference electrode of each electrode element, wherein the drive electrode and reference electrode are configured such that the first mutual coupling capacitance is substantially insensitive to an object touching the surface of the touch panel;
a second mutual coupling capacitance formed between the drive electrode and the sense electrode of each electrode element, wherein the drive electrode and sense electrode are configured such that the second mutual coupling capacitance varies with proximity of an object touching a surface of the touch panel; and
a sensing circuit electrically coupled to the sense electrode, drive electrode and reference electrode of an electrode element, the sensing circuit configured to measure the first and second independent mutual coupling capacitances.
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Abstract
A mutual capacitance touch panel device includes a substrate, and an array of electrode elements formed on the substrate. Each electrode element includes a drive electrode, a sense electrode and a reference electrode, the reference electrode arranged between the drive electrode and the sense electrode. A first mutual coupling capacitance is formed between the drive electrode and the reference electrode of each electrode element, wherein the drive electrode and reference electrode are configured such that the first mutual coupling capacitance is substantially insensitive to an object touching the surface of the touch panel.
17 Citations
19 Claims
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1. A mutual capacitance touch panel device, comprising:
- a substrate;
an array of electrode elements formed on the substrate, each electrode element including a drive electrode, a sense electrode and a reference electrode, the reference electrode arranged between the drive electrode and the sense electrode; a first mutual coupling capacitance formed between the drive electrode and the reference electrode of each electrode element, wherein the drive electrode and reference electrode are configured such that the first mutual coupling capacitance is substantially insensitive to an object touching the surface of the touch panel; a second mutual coupling capacitance formed between the drive electrode and the sense electrode of each electrode element, wherein the drive electrode and sense electrode are configured such that the second mutual coupling capacitance varies with proximity of an object touching a surface of the touch panel; and a sensing circuit electrically coupled to the sense electrode, drive electrode and reference electrode of an electrode element, the sensing circuit configured to measure the first and second independent mutual coupling capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- a substrate;
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18. A method for creating a mutual capacitance touch panel device, comprising:
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forming an array of electrode elements on a substrate, each electrode element including a drive electrode, a sense electrode and a reference electrode, the reference electrode arranged between the drive electrode and the sense electrode, wherein each electrode element is arranged such that a first mutual coupling capacitance formed between the drive electrode and the reference electrode of the respective electrode element is substantially insensitive to an object touching the surface of the touch panel and a second mutual coupling capacitance formed between the drive electrode and the sense electrode of the respective electrode element varies with proximity of an object touching a surface of the touch panel; and electrically coupling the sense electrode, drive electrode and reference electrode of an electrode element to a sensing circuit, the sensing circuit configured to measure the first and second independent mutual coupling capacitances. - View Dependent Claims (19)
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Specification