EP 0172343 A3 19880907 - DIGITAL CONTRAST CONTROL CIRCUIT FOR DISPLAY UNIT
Title (en)
DIGITAL CONTRAST CONTROL CIRCUIT FOR DISPLAY UNIT
Publication
Application
Priority
JP 17343384 A 19840822
Abstract (en)
[origin: EP0172343A2] A digital contrast control circuit for a display unit according to the present invention has an updown counter (45) for performing up- or down-count operations in response to a contrast control key signal supplied from a contrast control key arranged on a keyboard (43). A digital contrast output from the up/down counter is supplied to a D/A converter (49) arranged within a liquid crystal display unit (47). The D/A converter converts the digital contrast output to an analog contrast signal.
IPC 1-7
IPC 8 full level
H04N 5/57 (2006.01); G09G 3/18 (2006.01); G09G 3/36 (2006.01); G09G 5/00 (2006.01)
CPC (source: EP)
Citation (search report)
- [Y] US 4340889 A 19820720 - KNIGHT ERIC M, et al
- [A] US 4155044 A 19790515 - MARINO FRANCIS C [US]
- [A] FR 2441310 A1 19800606 - SIEMENS AG [DE]
- [Y] ELECTRONICS, 13th May 1976, pages 87-92, Mg-Graw Hill, New York, US; M. LORKOVIC: "MOS technology brings fun and games to tv sets"
- [Y] IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. SC-11, no. 6, December 1976, pages 801-808, IEEE, New York, US; H.J. CASIER et al.: "A pulse position modulation transmission system for remote control of a tv set"
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0172343 A2 19860226; EP 0172343 A3 19880907; AU 4363685 A 19860327; JP S6159477 A 19860326
DOCDB simple family (application)
EP 85107332 A 19850613; AU 4363685 A 19850613; JP 17343384 A 19840822