FINGERPRINT SENSING MODULE
First Claim
1. A fingerprint sensing module, comprising:
- a fingerprint sensing pixel array for sensing a fingerprint signal, wherein the fingerprint sensing pixel array comprises a plurality of sensing pixels in an array arrangement;
a plurality of column circuitries, wherein each column circuitry is electrically coupled to a row of the sensing pixels via a corresponding row signal line; and
a constant current circuit for generating a bias voltage to the column circuitries according to a reference current,wherein, in response to the bias voltage level, a row output current provided by each column circuitry and flowing through each row of the sensing pixels is equal to or close to the reference current.
2 Assignments
0 Petitions
Accused Products
Abstract
A fingerprint sensing module includes a fingerprint sensing pixel array, a plurality of column circuitries and a constant current circuit. The fingerprint sensing pixel array includes a plurality of sensing pixels in an array arrangement. Each column circuitry is electrically coupled to a row of the sensing pixels via a corresponding row signal line. The constant current circuit generates a bias voltage to the column circuitries according to a reference current. In response to the bias voltage level, a row output current provided by each column circuitry and flowing through each row of the sensing pixels is equal to or close to the reference current. Since the row output current coincides with the reference current, the row output current is not adversely affected by the external factors.
-
Citations
11 Claims
-
1. A fingerprint sensing module, comprising:
-
a fingerprint sensing pixel array for sensing a fingerprint signal, wherein the fingerprint sensing pixel array comprises a plurality of sensing pixels in an array arrangement; a plurality of column circuitries, wherein each column circuitry is electrically coupled to a row of the sensing pixels via a corresponding row signal line; and a constant current circuit for generating a bias voltage to the column circuitries according to a reference current, wherein, in response to the bias voltage level, a row output current provided by each column circuitry and flowing through each row of the sensing pixels is equal to or close to the reference current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A fingerprint sensing module, comprising:
-
a fingerprint sensing pixel array for sensing a fingerprint signal, wherein the fingerprint sensing pixel array comprises a plurality of sensing pixels in an array arrangement; a plurality of column circuitries, wherein each column circuitry is electrically coupled to a column of the sensing pixels via a corresponding column signal line; a current source providing a reference current; and a biasing circuit, wherein a first terminal of the biasing circuit is electrically coupled to the current source to receive the reference current, a second terminal of the biasing circuit is electrically coupled to a baseline voltage, and a third terminal of the biasing circuit is electrically coupled to the column circuitries, wherein the bias voltage is generated on the third terminal of the biasing circuit in response to the reference current, wherein in response to the bias voltage, a row output current is provided by each column circuitry, and the row output current is equal to or close to the reference current. - View Dependent Claims (9, 10, 11)
-
Specification