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Primary Examiner: Smith, Jr., David
Assistant Examiner:
Attorney: Ellingsberg; Donald J.

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Title: Drive circuit with constant current output

Abstract: A constant current drive circuit that can be driven directly from the output of a shift register which can find use, for example, as a constant current source for a light emitting diode (LED) to ensure uniform birghtness throughout a display surface that includes a plurality of LEDs.

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Other info:

Inventors: Erickson, Fred William (Woodland Hills, CA, US)
Nakahara, Roy Hiroshi (Sun Valley, CA, US)

Application Number: 626250
Filing Date: 1975-10-28
Publication_date: 1977-09-06
Assignee: Litton Systems, Inc. (Beverly Hills, CA)
Primary Class(es): 307/157 315/169.1, 345/46, 968/958, 968/DIG1
Other Classes:
US Patent Ref:

3740570	Jun, 1973	Kaelin et al.	307/40.
3754181	Aug, 1973	Kreitz	323/1.
3770890	Nov, 1973	Winkler	178/7.
3821596	Jun, 1974	Leuck	315/169.
3843959	Oct, 1974	Owaki et al.	178/7.
3886465	May, 1975	Mattfeld	330/15.

Other Refs: Other References: "Monolithic ICS Drive Plasma Displays" Electronic Engineering, Jan. 1974, p. 16.