Signal strength enhancement in a biometric sensor array
First Claim
1. A biometric object image sensor comprising:
- a plurality of capacitive gap sensor electrode traces formed on a glass substrate, wherein the plurality of capacitive gap sensor electrode traces form an array of biometric sensor imaging pixel locations within a biometric sensing area of the biometric image sensor, wherein at least one of the capacitive gap sensor electrode traces comprises a transmitter electrode trace and at least one of the capacitive gap sensor electrode traces comprises a receiver electrode trace, wherein a change in a resulting signal received by the receiver electrode trace is indicative of a biometric image characteristic at a respective pixel location in the array of biometric sensor imaging pixel locations; and
a controller integrated circuit (IC) mounted to the glass substrate, wherein the controller IC is in electrical contact with the plurality of capacitive gap sensor electrode traces.
5 Assignments
0 Petitions
Accused Products
Abstract
A biometric imager may comprise a plurality of sensor element traces formed in or on a sensor substrate which may comprise at least a portion of a display screen defining a biometric sensing area and forming in-active pixel locations; an auxiliary active circuit formed in or on the sensor substrate on the periphery of the biometric sensing area and in direct or indirect electrical contact with the sensor element traces; and providing a signal processing interface to a remotely located controller integrated circuit. The sensor element traces may form a portion of one dimensional linear sensor array or pixel locations in a two dimensional grid array capacitive gap biometric imaging sensor. The auxiliary circuit may provide pixel location selection or pixel signal amplification. The auxiliary circuit may be mounted on a surface of the display screen. The auxiliary circuit further comprising a separate pixel location selection controller circuit.
54 Citations
18 Claims
-
1. A biometric object image sensor comprising:
-
a plurality of capacitive gap sensor electrode traces formed on a glass substrate, wherein the plurality of capacitive gap sensor electrode traces form an array of biometric sensor imaging pixel locations within a biometric sensing area of the biometric image sensor, wherein at least one of the capacitive gap sensor electrode traces comprises a transmitter electrode trace and at least one of the capacitive gap sensor electrode traces comprises a receiver electrode trace, wherein a change in a resulting signal received by the receiver electrode trace is indicative of a biometric image characteristic at a respective pixel location in the array of biometric sensor imaging pixel locations; and a controller integrated circuit (IC) mounted to the glass substrate, wherein the controller IC is in electrical contact with the plurality of capacitive gap sensor electrode traces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A fingerprint imaging sensor comprising:
-
a plurality of capacitive gap sensor electrode traces formed on a glass substrate, wherein the plurality of capacitive gap sensor electrode traces form a two-dimensional array of fingerprint imaging pixel locations within a fingerprint sensing area of the fingerprint imaging sensor, wherein a first plurality of the capacitive gap sensor electrode traces comprises a plurality of transmitter electrode traces and a second plurality of the capacitive gap sensor electrode traces comprises a plurality of receiver electrode traces crossing over the plurality of transmitter electrode traces, wherein changes in resulting signals received by the plurality of receiver electrode traces are indicative of fingerprint image characteristics at the array of fingerprint imaging pixel locations; a plurality of dielectric islands between the plurality of transmitter electrode traces and the plurality of receiver electrode traces, wherein each dielectric island of the plurality of dielectric islands separates a respective transmitter electrode trace of the plurality of transmitter electrode traces from a respective receiver electrode trace of the plurality of receiver electrode traces at a crossover point therebetween; a controller integrated circuit (IC) mounted to the glass substrate, wherein the controller IC is in electrical contact with the plurality of capacitive gap sensor electrode traces, wherein the controller IC is mounted away from the two dimensional array of biometric sensor imaging pixel locations and outside of the biometric sensing area; and a molding compound encapsulating the controller IC.
-
-
15. A method of making a biometric object imaging sensor, the method comprising:
-
providing a glass substrate; depositing a first metal layer over the glass substrate, wherein the first metal layer is patterned into a first plurality of capacitive gap sensor electrode traces; depositing a first dielectric layer over the first metal layer, wherein the first dielectric layer is patterned into a plurality of isolation islands; depositing a second metal layer over the first dielectric layer, wherein the second dielectric layer is patterned into a second plurality of capacitive gap sensor electrode traces; depositing a second dielectric layer over the second metal layer; planarizing the second dielectric layer; and bonding a controller integrated circuit (IC) over the glass substrate. - View Dependent Claims (16, 17, 18)
-
Specification