CONTACT RESISTANCE MEASUREMENT FOR RESISTANCE LINEARITY IN NANOSTRUCTURE THIN FILMS
First Claim
1. A transparent conductor for use in a touch panel, the transparent conductor comprising:
- a substrate; and
a conductive layer on the substrate, the conductive layer including a plurality of conductive nanostructures and having a range of contact resistances that is between a lower value and an upper value, the median contact resistance being less than a limit resistance at which the conductive layer begins to have degraded performance.
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Accused Products
Abstract
The present disclosure is directed to a transparent conductor for use in touch panel devices having a plurality of nanostructures therein that provides reliable output based on user touch or pen input. To determine if a touch panel is reliable, there is disclosed a method of measuring voltages across the transparent conductor when it is touched. These measured voltages are converted into contact resistances, which are statistically analyzed. A median contact resistance is determined based on the converted contact resistances. The remaining set of converted contact resistances are analyzed to determine if they are within acceptable limits. Acceptable limits may include most of the contact resistances falling within a range, none of the contact resistances exceeding an upper limit, and a difference in contact resistances converted for different users or pens does not exceed a maximum variability.
69 Citations
13 Claims
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1. A transparent conductor for use in a touch panel, the transparent conductor comprising:
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a substrate; and a conductive layer on the substrate, the conductive layer including a plurality of conductive nanostructures and having a range of contact resistances that is between a lower value and an upper value, the median contact resistance being less than a limit resistance at which the conductive layer begins to have degraded performance. - View Dependent Claims (2, 3, 4, 5)
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6. A touch panel comprising:
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a substrate; and a conductive layer on the substrate, the conductive layer including a plurality of conductive nanostructures, the conductive layer having contact resistances, wherein most of the contact resistances fall between a lower percentage of an input impedance of the touch panel that is below a first median contact resistance and an upper percentage of the input impedance of the touch panel that is above the first median contact resistance. - View Dependent Claims (7, 8, 9, 10)
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11. A method comprising:
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measuring a set of contact resistances across a surface of a transparent conductor of a touch panel; determining a median contact resistance from the set of contact resistances; determining a percentage of the contact resistances from the set of contact resistances that fall within a range of resistances that surrounds the median contact resistance; and determining when either the percentage of the contact resistances is lower than a first percentage threshold, or a contact resistance from the set of contact resistances is above a contact resistance limit. - View Dependent Claims (12, 13)
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Specification