Optical fingerprint sensor with variable resistors
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 6, 2007
Grant Date -
Jan 20, 2005
app pub date -
Aug 31, 2003
filing date -
Jul 17, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fingerprint sensor for sensing a fingerprint has a detecting and processing circuit and a plurality of sensing units. Each of the sensing units has a switch element, a first resistor, and a second resistor. The switch element has a first terminal, a second terminal, and a third terminal. Resistance of the second resistor is fixed. The fingerprint influences an intensity of light illuminating the first resistor so that resistance of the first resistor and a voltage level of the second terminal change. When the switch elements are turned on, the detecting and processing circuit analyzes the fingerprint according to the voltage levels of the second terminals of the plurality switch elements.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully