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Stephen W Ray: Solid state lamp. Sughrue Rothwell Mion Zinn and Macpeak, July 8, 1980: US04211955 (458 worldwide citation)

An integrated circuit chip containing one or more light-emitting diodes is mounted within a light-diffusing encasement having a standard incandescent light bulb lamp base. The integrated circuit chip also contains a rectifier and voltage regulator circuit. The resulting solid state lamp may then be ...


2
Herbert F Börner, Wolfgang Busselt, Thomas Jüstel, Hans Nikol, Cornelis R Ronda, Gerard Harbers: Lighting system. U S Philips Corporation, Dicran Halajian, May 22, 2001: US06234648 (446 worldwide citation)

A lighting system includes at least two light-emitting diodes each emitting, in operation, visible light in a preselected wavelength range. A converter converts part of the visible light emitted by one of the diodes into visible light in a further wavelength range so as to optimize the color renditi ...


3
Jun ichi Nishizawa, Yasuo Okuno, Keishiro Takahashi: Light-responsive light-emitting diode display. Zaidan Hojin Handotai Kenkyu Shinkokai, Cushman Darby & Cushman, May 11, 1982: US04329625 (276 worldwide citation)

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 correspondenc ...


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Maurice S Kanbar: Screw-in led lamp. Michael Ebert, December 15, 1998: US05850126 (226 worldwide citation)

A screw-in LED lamp which derives its power from a socket connected to an A-C power line, the lamp being screwed into the socket to produce a light of high intensity useful as a traffic signal or as a warning signal. The lamp includes a screw-in plug connected to a regulator in which the A-C is conv ...


6
Howard C Kirsch: Current control circuit for light emitting diode. Bell Telephone Laboratories Incorporated, July 10, 1979: US04160934 (107 worldwide citation)

The current in a semiconductive light emitting diode (LED), driven by an insulated gate field effect transistor (IGFET) switch, is stabilized by a current control circuit including a comparator type feedback network, which stabilizes the voltage at a node located between said switch and the series c ...


7
Jon A Bloyd: Light indicating system having light emitting diodes and power reduction circuit. Jacox & Meckstroth, August 3, 1982: US04342947 (101 worldwide citation)

A light indicating monitoring system includes a plurality of light emitting diodes (LED's) having a common ground connected to a phase controlled silicon controlled rectifier (SCR) circuit. The SCR circuit limits conduction of rectified AC energy through the LED's and through corresponding resistors ...


8
Kiyokazu Shirai: Light emitting apparatus comprising multiple groups of LEDs each containing multiple LEDs. Sony Tektronix Corporation, Smith Hill and Bedell, January 28, 1997: US05598068 (65 worldwide citation)

A plurality of LEDs are divided into multiple groups with the LEDs in each group being connected in series and being driven by a single current source. A region to be illuminated is divided into many areas with no spacing between adjacent ones of the areas. The LEDs in each group are positioned in d ...


9
Peter F Menard, Paul R Allen: Light emitting diode array. United States of America, Robert M Wohlfarth, John P Tarlano, July 3, 1990: US04939426 (64 worldwide citation)

A light emitting diode lamp that operates directly from an AC input. The lamp has an even number of light emitting diodes that are disposed on a cylindrical cluster plate. The diodes are separated into two halves that are conductable in opposite electrical directions. The two halves of diodes are co ...


10
Robert S Stricklin Jr: Constant output light emitting device. TRW, Jack A Kanz, January 8, 1980: US04182977 (58 worldwide citation)

A light emitting device which provides substantially constant output power is disclosed. The light emitting device includes a light emitter and a compensating circuit for supplying current to the light emitter so that at any given time an increase in electric current produces a corresponding increas ...