Capacitive sensing system
First Claim
1. A capacitive sensing system comprising one or more sensors having a thin film structure, the thin film structure comprisinga first conductive film comprising a separate sensing electrode for each of the one or more sensors;
- a second conductive film comprising a separate back guard electrode for each of the one or more sensors; and
a first insulating film arranged between the first conductive film and the second conductive film;
wherein the sensing electrode is smaller than the back guard electrode, so that a peripheral portion of the back guard electrode extends laterally beyond the sensing electrode to form a side guard electrode which substantially surrounds the sensing electrode.
3 Assignments
0 Petitions
Accused Products
Abstract
A capacitive sensing system with a sensor having a thin film structure. The thin film structure includes a first insulating layer and a first conductive film having a sensing electrode formed on a first surface of the first insulating layer and a second conductive film having a back guard electrode. The back guard electrode is formed in a single plane and has a peripheral portion in the same plane, and is disposed on a second surface of the first insulating layer and a first surface of a second insulating layer or protective layer. The peripheral portion of the back guard electrode extends beyond the sensing electrode to form a side guard electrode which substantially or completely surrounds the sensing electrode.
14 Citations
20 Claims
-
1. A capacitive sensing system comprising one or more sensors having a thin film structure, the thin film structure comprising
a first conductive film comprising a separate sensing electrode for each of the one or more sensors; -
a second conductive film comprising a separate back guard electrode for each of the one or more sensors; and a first insulating film arranged between the first conductive film and the second conductive film; wherein the sensing electrode is smaller than the back guard electrode, so that a peripheral portion of the back guard electrode extends laterally beyond the sensing electrode to form a side guard electrode which substantially surrounds the sensing electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification