Contrast control circuit for display apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 20, 2004
Grant Date -
Nov 1, 2001
app pub date -
Apr 27, 2001
filing date -
Apr 28, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A contrast control circuit for a display apparatus includes first and second resistors, a first transistor, a second transistor, and a Darlington circuit. The first and second resistors, each have a first end connected to a positive supply voltage. The first transistor has an emitter connected to a second end of the first resistor and a base to which the first voltage is input. The second transistor has an emitter connected to the second end of the first resistor, a base connected to the second end of the second resistor, and a collector connected to a negative supply voltage. The Darlington circuit is connected between the second voltage, the collector of the first transistor, and the negative supply voltage, and operates such that the absolute value of the second voltage is inversely proportional to the absolute value of the first voltage.
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