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| Number | Title | Issue Date |
| 8063573 | Backlight assembly and a display device having the same A backlight assembly includes: a plurality of lamp units; and an inverter which includes a plurality of pattern capacitors, wherein each of the pattern capacitors is electrically connected to a respective one of the plurality of lamp units, wherein each of the patte... | 11/22/2011 |
| 7247989 | Gas discharge display There is disclosed a gas discharge display device comprised of microspheres containing ionizable gas, each microsphere being positioned within a cavity, well, or hollow. Photons from the gas discharge within a microsphere excite a phosphor such that the phosphor emi... | 07/24/2007 |
| 6803731 | Operating circuit for a discharge lamp with early EOL detection The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, the DC voltage can be modified by an offset voltage 10 | 10/12/2004 |
| 6646390 | EOL detection with integrated filament interrogation The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, an electrode interrogation can be carried out by checking a resp... | 11/11/2003 |
| 6326738 | Two wire light for electronic displays An apparatus for illuminating an electronic display such as an LCD. A single hot wire is connected to multiple capacitors each dedicated to a cold cathode fluorescent tube, and multiple tubes are incorporated to illuminate the electronic display. Multiple... | 12/04/2001 |
| 6232724 | Light emitting diode array An LED array composed of a plurality of LEDs is disposed on either side of a signal interconnection board, while metal plates are disposed on the other side of the signal interconnection board as positive and negative power source lines for driving the LE... | 05/15/2001 |
| 5434476 | Circuitry for operating fluorescent lamps with no stroboscopic effects Circuitry is disclosed for operating with no stroboscopic effects at least three fluorescent lamps connected to a single source of single phase alternating voltage. In order to suppress the stroboscopic effects, the first lamp circuit (1) is connected in ... | 07/18/1995 |
| 5247228 | Fluorescent lamp ballast adaptor An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type ballast installed therein. The adaptor circuit contains a... | 09/21/1993 |
| 5220247 | Circuit for driving a gas discharge lamp load For driving gas discharge lamps (102, 104) having heatable filaments (102A, 102B, 104A, 104B), a circuit (100) has an inverter (132, 134) and a series-resonant LC oscillator (150, 158, 170) forming a self-oscillating inverter. The oscillator output provid... | 06/15/1993 |
| 5214355 | Instant-start electronic ballast A half-bridge inverter is powered from a constant-magnitude DC supply voltage and provides at the inverter's output a first AC output voltage that is describable as a modified squarewave voltage. This first AC voltage is applied across a series-combinatio... | 05/25/1993 |
| 5081401 | Driver circuit for a plurality of gas discharge lamps A circuit (100) for driving a plurality of gas discharge lamps (102, 104), and having: input terminals (126, 130) for connection to a source of voltage supply; output terminals (134, 136, 140) for connection to the lamps in series; an oscillator (124, 132... | 01/14/1992 |
| 5049783 | Electronic ballast device for fluorescent lamps In an electronic ballast for at least one fluorescent lamp equipped with heatable electrodes, the heatable electrodes must be adequately preheated before the actual ignition of the fluorescent lamp. Given a high-frequency preheating of the heating electro... | 09/17/1991 |
| 4912371 | Power saving fluorescent lamp substitute An improved non-lighting fluorescent lamp substitute to replace one lamp in a two-lamp series connected circuit so that the circuit is completed through the remaining lamp allowing it to light, whereas without the lamp substitute, the circuit is incomplet... | 03/27/1990 |
| 4818918 | High frequency lighting system for gas discharge lamps A high frequency system for gas discharge lamps includes a method of, and apparatus for, controlling the operation of a plurality of gas discharge lamps and provides; a reduction in starting and operating voltage and current; an increased range of dimming... | 04/04/1989 |
| 4757238 | Low voltage fluorescent lighting system This invention is directed to an improved low voltage fluorescent lighting system having two elongated fluorescent lamps. The invention provides an improved simple switching system which allows one or both lamps to be turned on. The improved switching sys... | 07/12/1988 |
| 4661745 | Rapid-start fluorescent lamp power reducer A rapid-start fluorescent lamp system includes a ballast circuit, rapid-start fluorescent lamps and power reducing means for controlling the application of energy to the lamps. The power-reducing means controls the energy to N/O switches from the energy s... | 04/28/1987 |
| 4649322 | Energizing arrangement for controlling the luminous intensity of at least one discharge lamp and use of such arrangement The arrangement of the invention enables control of a light emitting element comprising at least one discharge tube. Firing of the tube is effected by a generator which provides voltage pulses at predetermined periodic intervals (Tr). The lumin... | 03/10/1987 |
| 4496880 | Fluorescent lamp ballast A ballast for energizing a pair of fluorescent lamps in response to power supplied by an AC line, includes a capacitor connected between one of a pair of heater winding leads which connect to a filament contained in one of the fluorescent lamps, and one o... | 01/29/1985 |
| 4348614 | Non-light producing substitute apparatus for use in place of phosphor excitable lamps A non-light producing substitute apparatus for use as a replacement for a phosphor energizable lamp in an arrangement where a plurality of such lamps are connected in a series electrical circuit. Typically, two or more phosphor energizable lamps, such as ... | 09/07/1982 |
| 4339690 | Energy saving fluorescent lighting system Energy-saving circuitry for a rapid-start fluorescent lighting system includes a reactance-modifying capacitor coupled in series with first and second fluorescent lamps and includes a filament switch which is operative to conduct filament heating current ... | 07/13/1982 |
| 4286194 | Generator for use with loads having changing impedance characteristics A generator for the starting and thereafter maintaining energization and operation of a load which has a relatively high impedance during starting and a substantially lower impedance after starting and during operation thereof. The load may be an ionic co... | 08/25/1981 |
| 4256993 | Energy saving device for rapid-start fluorescent lamp system Add-on device for connection in series with one lamp of a two-lamp rapid-start fluorescent light system to reduce by a predetermined amount the nominal power consumption and light output of the system. The device has normally closed relay contacts which a... | 03/17/1981 |
| 4255692 | Non-light producing phosphor energizable lamp simulator and methods of using same and making same A lamp simulator for use as a replacement for a phosphor excitable lamp, such as a fluorescent lamp in a plural lamp fixture. The fixture is typically one with socket-type connectors adapted to have at least two or more phosphor excitable lamps mounted th... | 03/10/1981 |
| 4132925 | Direct current ballasting and starting circuitry for gaseous discharge lamps Direct current ballasting and starting circuitry for efficiently operating a gaseous discharge lamp on direct current. A series-pass switching transistor in one of a pair of input lines alternately switches between on and off states to periodically supply... | 01/02/1979 |
| 3956665 | Device for replacing a fluorescent lamp in a serially connected fluorescent lamp system A device for replacing a fluorescent lamp in a two lamp serially connected fluorescent fixture either of the type which includes a rapid-start type transformer for every two rapid-start fluorescent lamps or an instant start fixture for every two instant s... | 05/11/1976 |
| 3954316 | Electrical apparatus and method for reducing power consumption of a fluorescent lamp system An attachment is provided for inclusion in a two-lamp rapid-start type fluorescent lamp and encapsulated ballast transformer combination to reduce the electrical power consumption thereof, comprising an isolation transformer and a capacitor. The isolation... | 05/04/1976 |
