04329625 is referenced by 276 patents and cites 6 patents.

A light-responsive light-emitting diode display comprises a light-emitting diode circuit including a series connection of light-emitting diodes and a light-responsive current-controlling circuit connected in series to said light-emitting diode circuit for supplying a current thereto in correspondence with the ambient brightness. A unipolar photo-transistor can provide a current above a predetermined minimum value and increasing with the intensity of incident lights and can absorb excess voltages when applied. Light-responsive current-control reduces the useless power dissipation, and all solid-state display provides a very long service life.

Title
Light-responsive light-emitting diode display
Application Number
6/58545
Publication Number
4329625
Application Date
July 17, 1979
Publication Date
May 11, 1982
Inventor
Keishiro Takahashi
Sendai
JP
Yasuo Okuno
Sendai
JP
Jun ichi Nishizawa
Sendai
JP
Agent
Cushman Darby & Cushman
Assignee
Zaidan Hojin Handotai Kenkyu Shinkokai
JP
IPC
H05B 43/00
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