Global Patent Index - EP 0180642 A4

EP 0180642 A4 19890613 - DATA DISPLAY APPARATUS.

Title (en)

DATA DISPLAY APPARATUS.

Title (de)

DATENANZEIGEVORRICHTUNG.

Title (fr)

APPAREIL D'AFFICHAGE DE DONNEES.

Publication

EP 0180642 A4 19890613 (EN)

Application

EP 85901065 A 19850220

Priority

JP 3261384 A 19840224

Abstract (en)

[origin: WO8503795A1] A data display apparatus using a plurality of light-emitting diodes (19), (20) as display elements to display characters or figures in the form of a chain of dots. The light-emitting diodes (19), (20) are controlled by a photoelectric converter circuit (2) and by pulse oscillation circuits (4), (6) that are connected to the photoelectric converter circuit (2) and that produce pulse signals by changing the ratio of pulse output time in response to output signals of the circuit (2) so that brightness of the diodes is tuned to the ambient brightness (1). A level detector circuit (8) is also provided to change the kinds and numbers of light-emitting diodes that are to be driven.

IPC 1-7

G09G 3/14; G09G 3/32

IPC 8 full level

G09F 9/33 (2006.01); G09F 9/00 (2006.01); G09G 3/14 (2006.01); G09G 3/32 (2006.01)

CPC (source: EP)

G09G 3/14 (2013.01); G09G 3/32 (2013.01)

Citation (search report)

  • [A] DE 3035944 A1 19820408 - LICENTIA GMBH [DE]
  • [A] US 3909788 A 19750930 - KAELIN GEORGE R, et al
  • [A] US 4340889 A 19820720 - KNIGHT ERIC M, et al
  • [X] ELECTRONIC ENGINEERING, vol. 46, no. 559, September 1974, page 15, London, GB; S.A. MONEY: "Timer and photocell adjust display brilliance"
  • [X] ELECTRONIC, vol. 47, no. 26, 26th December 1974, page 105, New York, US; F.E. HINKLE et al.: "Timer IC and photocell can vary LED brightness"
  • [X] TOUTE L'ELECTRONIQUE, no. 447, Oktober 1979, page 59, Paris, FR; "Contrôle automatique de brillance pour afficheurs"
  • [A] ELEKTOR, vol. 2, no. 7-8, July/August 1976, pages 756-757, Canterbury, GB; "Reat-out brightness regulator"

Designated contracting state (EPC)

AT BE CH DE FR GB LI LU NL SE

DOCDB simple family (publication)

WO 8503795 A1 19850829; EP 0180642 A1 19860514; EP 0180642 A4 19890613; JP H0723987 B2 19950315; JP S60177395 A 19850911; KR 890005189 B1 19891216

DOCDB simple family (application)

JP 8500070 W 19850220; EP 85901065 A 19850220; JP 3261384 A 19840224; KR 850700258 A 19851017