Variable capacitor array
First Claim
Patent Images
1. A digitizer comprising:
- a digitizer sensor comprising at least one pair of conductive lines coupled to at least one differential amplifier through which a difference signal is detected; and
at least one capacitor operative to balance differences in parasitic capacitance between the conductive lines of the at least one pair of conductive lines.
5 Assignments
0 Petitions
Accused Products
Abstract
A digitizer includes a digitizer sensor comprising at least one pair of conductive lines coupled to at least one differential amplifier through which a difference signal is detected, and at least one capacitor operative to balance differences in parasitic capacitance between the conductive lines of the at least one pair of conductive lines.
-
Citations
53 Claims
-
1. A digitizer comprising:
-
a digitizer sensor comprising at least one pair of conductive lines coupled to at least one differential amplifier through which a difference signal is detected; and
at least one capacitor operative to balance differences in parasitic capacitance between the conductive lines of the at least one pair of conductive lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A method for reducing the effects of unbalanced parasitic capacitance in a digitizer comprising:
-
detecting a difference signal between a pair of conductive lines of a digitizer sensor; and
coupling a capacitor to at least one conductive line of the pair of conductive lines to reduce the imbalance. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 49)
-
-
47. A method of operating a sensor comprising at least one array of conductive lines spaced apart in a given direction and a plurality of differential amplifiers to which said conductive lines are pairwise coupled, the method including:
-
adding a capacitance to at least one line of each pair operative to compensate for imbalance capacitance;
electrifying each line of a given pair with a same voltage; and
determining whether a touch occurs near a conductor from an output voltage of said amplifier. - View Dependent Claims (48, 50, 51, 52)
-
-
53. A digitizer comprising:
-
a digitizer sensor comprising at least one pair of conductive lines coupled to at least one differential amplifier through which a difference signal is detected; and
at least one capacitor operative to minimize the output signal of the differential amplifier when no object is present over the digitizer sensor.
-
Specification