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| Number | Title | Issue Date |
| 8154219 | Method of scanning backlight driving lamps for an LCD A control signal is provided for turning on and turning off a lamp of a backlight source. For a first duration when the liquid crystal is rotating, adjust a frequency of the control signal to turn on and turn off the lamp of the backlight source consecutively or adj... | 04/10/2012 |
| 8035317 | Optocoupler system with reduced power consumption and pulse width distortion According to one embodiment, there is provided an optocoupler system configured to generate current signals having high, low and no amplitude portions in response to the receipt of logic high and low input signals. The varying amplitude portions of the current signa... | 10/11/2011 |
| 8035316 | Current-limiting protection circuit of a remotely controlled ceiling fan-lamp A current-limiting protection circuit of remotely controlled ceiling fan-lamp is disclosed. The current-limiting protection circuit includes a microcontroller unit for detecting rectangular wave signal reflective of the power used by a lamp load. The rectangular wav... | 10/11/2011 |
| 7986109 | Load driving circuit and method of setting load current thereof A load driving circuit is disclosed that allows a charge pump circuit to operate at an optimum step-up ratio without frequently changing the step-up ratio. The load driving circuit includes a step-up circuit; a current setting circuit that sets a value of an electri... | 07/26/2011 |
| 7915838 | Delta-sigma signal density modulation for optical transducer control A controller for optical transducers uses delta-sigma signal density modulation to reduce electromagnetic interference. ... | 03/29/2011 |
| 7323825 | Ballast integrated circuit (IC) A ballast integrated circuit (IC) for driving a first switching element and a second switching element includes: a variable gain amplifier (VGA) connected to a first input terminal connected to a resistor, for generating an output current signal according to a resis... | 01/29/2008 |
| 7317287 | Circuit for an LED array A circuit arrangement for an LED array having two or more parallel-connected LED chains (LK1, LK2, LK3), in each of which at least one LED (2) is arranged and, when there are two or more LEDs (2), the latter are connected in series... | 01/08/2008 |
| 7309960 | Vehicular lamp with current controlling unit There is provided a vehicular lamp that can inform walkers or drivers in the other vehicles of the existence of the moving vehicle even where the circumference of the vehicle is bright by emitting a light amount larger than that of normal times when the circumferenc... | 12/18/2007 |
| 7187008 | Semiconductor driver circuit, display device and method of adjusting brightness balance for display device A semiconductor driver circuit has a plurality of output bumps that are connected to respective electrodes for energizing electroluminescent devices by electric current supplied through the electrodes. The output bumps are arranged in a plurality of output bump rows... | 03/06/2007 |
| 7122974 | Light quantity adjusting method, light quantity adjusting apparatus, and image forming apparatus A light quantity adjusting method is used for driving a light emitting device with two drive current levels. The drive current levels are controlled by the first set data and the second set data, respectively. First, a resolution ratio and light quantity characteris... | 10/17/2006 |
| 7122971 | Driver circuit for driving a plurality of DC lamp strings A driver circuit for a DC light source supplies a voltage generated by a DC-to-DC converter for a plurality of lamp strings connected in parallel and a plurality of driving currents generated by a current mirror for the lamp strings, such that the lamp strings may h... | 10/17/2006 |
| 7019719 | Method and clamping apparatus for securing a minimum reference voltage in a video display boost regulator An apparatus for generating and providing a stable reference voltage to a boost regulator. The apparatus comprises a clamping circuit that is configured to receive a constant voltage and a variable voltage. The clamping circuit is further configured to generate the ... | 03/28/2006 |
| 7012384 | Illumination device for vehicle compartment An illumination device having a first light source, a second light source, whose luminous color differs from that of said first light source, and a controller for controlling the illuminating condition of each of the first light source and the second light source is... | 03/14/2006 |
| 7009603 | Method and apparatus for driving light emitting polymer displays A method and apparatus for driving light emitting polymer (PolyLED) displays is provided. Because PolyLED displays exhibit high capacitance characteristics, pre-charge current is injected to bring the diode up to near its operating current prior to enabling the diod... | 03/07/2006 |
| 6995523 | Discharge lamp lighting device Disclosed herein is a discharge lamp lighting device which realizes the minute control of the lighting sequence and electric power of a high-pressure discharge lamp and the control of various anti-error protecting functions by mounting a microcomputer. However, sinc... | 02/07/2006 |
| 6958583 | AC voltage control circuit The inventive control circuit 40 serves to render the output voltage to be the output value of any one of the outputs OUT1 to OUT5 when both the main power source A of the power saving device 100 and the control circuit's switch B are in ... | 10/25/2005 |
| 6949885 | Discharge lamp lighting device and lighting apparatus A discharge lamp lighting device includes a discharge lamp that is lighted through an L-C resonance induced by an oscillation output of an inverter circuit. An on-off operation of switching elements of the inverter circuit is controlled by a control IC which include... | 09/27/2005 |
| 6949893 | Television receiver and cold-cathode tube dimmer In a cold-cathode dimmer, a current detector includes a LPF for removing the frequency component of a lighting/driving signal for a lighting driver from the output of a diode for rectifying the voltage across a current detecting resistor and passing the frequency co... | 09/27/2005 |
| 6949891 | Light quantity adjusting method, light quantity adjusting apparatus, and image forming apparatus A light quantity adjusting method is used for driving a light emitting device with two drive current levels. The drive current levels are controlled by the first set data and the second set data, respectively. First, a resolution ratio and light quantity characteris... | 09/27/2005 |
| 6819060 | Power line monitor and interrupt arrangement for averting premature lamp mortality in low voltage conditions A system and method for mitigating the effects of low power line voltage that can otherwise cause premature lamp mortality. A monitor circuit is provided for monitoring power characteristics relating to UV and/or fluorescent lamp operation, such as the lamp supply v... | 11/16/2004 |
| 6803732 | LED array and LED module with chains of LEDs connected in parallel An LED array has a plurality of LED chains, which each have at least one LED and are connected in parallel. The LED array has at least one output for feeding back radiation generated to a power supply unit. Preferably, at least one reference LED chain is connected i... | 10/12/2004 |
| 6593709 | Dual mode electronic dimmer An electronic lamp dimmer includes a burst dimmer circuit and an analog dimmer circuit formed adjacent to each other on an integrated circuit substrate. The burst dimmer circuit controls the illumination intensity of a lamp over a first operating range an... | 07/15/2003 |
| 6515437 | Power supply for hybrid illumination system A track lighting hybrid illumination system comprising a power supply circuit (11, 41, 22) having an input for connecting to a voltage source (12, 42) of low frequency for providing an output voltage with altered electrical characteristics, and a pair of ... | 02/04/2003 |
| 6495973 | Lighting control system and method A lighting control system for maintaining a predetermined light level in a lighting zone illuminated by both natural and artificial light includes a CPU connected to an electrical power source and to an electric light. The CPU directs a predetermined init... | 12/17/2002 |
| 6459919 | Precision illumination methods and systems Methods and systems are provided for illuminating a material using an LED system, a processor for controlling the LED system and a positioning system for positioning the LED system in a spatial relationship with the material being illuminated. Furthermore... | 10/01/2002 |
| 6433488 | OLED active driving system with current feedback The invention provides an organic light emitting diode active driving system with current feedback, thereby a driving current for organic light emitting diode is not affected by variation of characteristic parameters of thin film transistor under an activ... | 08/13/2002 |
| 6369525 | White light-emitting-diode lamp driver based on multiple output converter with output current mode control A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and ... | 04/09/2002 |
| 6274986 | Method and apparatus for driving a discharge lamp with pulses that terminate prior to the discharge reaching a steady state An apparatus and method for applying short pulsed waveforms, on the order of 1 μs pulses at a frequency of about 5 kHz, to a discharge lamp, such as a low-pressure mercury/argon lamp, in order to shift the ratio of the intensities of two of the mercury l... | 08/14/2001 |
| 6160360 | Power control with reduced radio frequency interference A circuit for controlling the power to a load such as motor or incandescent lamp with reduced radio frequency interference employs a microcontroller to trigger a power transistor into a conductive state for supplying power to the load. The power transisto... | 12/12/2000 |
| 6069451 | Analog to pulse width converter for field emission displays A field emission display ("FED") is disclosed having a gray scale range. Input into the FED, initially, is an analog signal input. The FED, by employing an analog to pulse width converter, subsequently converts the analog input to a pulse width output, th... | 05/30/2000 |
| 5973455 | Electronic ballast with filament cut-out An electronic ballast for a gas discharge lamp includes an AC to DC converter for changing alternating current at power line voltage to direct current and an inverter powered by the converter and having a series resonant, direct coupled output coupled to ... | 10/26/1999 |
| 5949190 | Internal combustion engine-driven discharge lamp lighting apparatus An internal combustion engine-driven discharge lamp lighting apparatus including an internal combustion engine and a generator driven by the internal combustion engine to generate an output voltage and capable of lighting a high-voltage discharge lamp suc... | 09/07/1999 |
| 5793164 | Low intensity aircraft rotor tip illumination A wing tip system for rotor craft includes a downwardly-facing light housing to provide a visual aid to rotor wingtip position. This system is visible to crew members and to adjacent crew, particularly when using night vision goggles (NVG) or other ambien... | 08/11/1998 |
| 5684368 | Smart driver for an array of LEDs A smart driver in combination with an LED including a column driver coupled to one terminal of the light emitting device and a row driver coupled to another terminal of the light emitting device to form an addressed circuit. A controllable power supply ha... | 11/04/1997 |
| 5680016 | Transformerless electronic ballast for gaseous discharge lamps A transformerless ballast for a gaseous discharge lamp is disclosed. The ballast comprises: a rectifier; a filter for the rectifier output; a voltage divider for the filter output; an electronic gate modulating the filter output to power a lamp when the l... | 10/21/1997 |
| 5592052 | Variable color temperature fluorescent lamp A fluorescent lamp (2) having at least two phosphor coatings (12) on the surface of the sealed lamp bulb, typically an inner surface. There is variable driving means which preferentially activates one phosphor and not the other phosphors, at one arrangeme... | 01/07/1997 |
| 5424618 | Arrangements for reducing interference from a dimming system, and dimmer therefor A lighting control system which comprises an AC mains power point, power distribution means coupled to the AC mains, a dimmer assembly comprising one or a plurality of co-located dimmer circuits each coupled to the distribution means to receive AC power t... | 06/13/1995 |
| 5357170 | Lighting control system with priority override An energy-saving lighting control system is selectively operable in either a normal mode, in which certain lighting parameters (e.g., maximum and minimum light levels, fade rates, etc.) are preset and lighting level is determined by which of a plurality o... | 10/18/1994 |
| 4605301 | Exposure method of semiconductor wafer by mercury-vapor lamp Through a pattern mask, small sections of a semiconductor wafer are exposed successively to light radiated from a mercury-vapor lamp in high-level steps, during each of which the power consumption and discharge current of the mercury-vapor lamp are at a h... | 08/12/1986 |
| 4546290 | Ballast circuits for discharge lamp A high frequency ballast circuit for a discharge lamp particularly of the so-called energy saving type adapted to fit into conventional incandescent lamp sockets. The circuit comprises an inductive choke and a transistor switching device connected in seri... | 10/08/1985 |
