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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 8188672 | High-pressure discharge lamp system and projector using the same A high-pressure discharge lamp system has a high-pressure mercury lamp 4 and a lighting circuit 3 that operates the lamp 4. The lamp 4 includes an envelope having a light emitting part 6 having a first and a second electrode 10,... | 05/29/2012 |
| 8169151 | DC/AC converter and controller thereof A DC/AC converter includes a resonant circuit having a first capacitor connected to at least one of a primary winding and a secondary winding of a transformer and an output end connected to a load, the resonant circuit receiving an alternating signal having a predet... | 05/01/2012 |
| 8169150 | Powering and controlling light emitting diodes via thermally separated arrays of dissipative active elements A chipset for powering and controlling a plurality of light emitting diode (LED) strings. The chipset includes a controller having a pulse width modulating (PWM) functionality and a data transfer interface circuitry; and at least one dissipative active element array... | 05/01/2012 |
| 8148907 | Dimmable power supply Various embodiments of a dimmable power supply are disclosed herein. For example, some embodiments provide a dimmable power supply including an output driver, a variable pulse generator and a load current detector. The output driver has a power input, a control inpu... | 04/03/2012 |
| 8143798 | Driving device and driving method for discharge lamp, light source device, and image display apparatus A driving device for a discharge lamp includes: a discharge-lamp lighting unit that supplies an alternating current to the discharge lamp to thereby supply electric power to between two electrodes of the discharge lamp; an inter-electrode-voltage detecting unit that... | 03/27/2012 |
| 8143799 | Light emitting diode driving circuit A LED driving circuit includes a transformer, a rectifying filtering circuit, a PWM IC, a constant current circuit, and a feedback circuit. The transformer has a primary side and a secondary side. The rectifying filtering circuit is coupled to the secondary side and... | 03/27/2012 |
| 8129917 | Light emitting device for AC operation An AC light emitting device is disclosed. The AC light emitting device includes at least four substrates. Serial arrays each of which has a plurality of light emitting cells connected in series are positioned on the substrates, respectively. Meanwhile, first connect... | 03/06/2012 |
| 8125157 | Light source and method for producing light modifiable in colour and/or luminosity The present invention relates to a light source, which produces light leaving the light source with modifiable color and luminosity, with at least one light emitting diode for emitting primary radiation, comprising a layer connected with said diode, wherein said lay... | 02/28/2012 |
| 8120269 | Circuit arrangement and method for operating a high-pressure discharge lamp A circuit arrangement for operating a high-pressure discharge lamp (12) with an electronic ballast, which is designed to provide an AC feed signal for the high-pressure discharge lamp (12). The AC feed signal comprises, in the time range as modulation ... | 02/21/2012 |
| 8120268 | Lighting device and method of control based on chemistry composition of power source A lighting device is generally illustrated having a light body having forward facing light sources including a visible white light source, visible colored light source and an infrared light source. Additionally, a side facing light source is provided. The light body... | 02/21/2012 |
| 8115404 | High pressure discharge lamp lighting device and luminaire A high pressure discharge lamp lighting device, includes: a DC/DC converter for converting a power source voltage of a DC power source into a desired DC voltage and stably lighting a high pressure discharge lamp; a DC/AC inverter for inverting the DC voltage into an... | 02/14/2012 |
| 8110999 | Light source apparatus The light source apparatus is provided with a plurality of light source device disposed in the form of a ring and that emit illumination light toward the central axis of the ring by being lit in a sequential pulsed fashion; a light-guide portion having a light entra... | 02/07/2012 |
| 8098018 | Pulse dimming circuit and the method thereof The present invention provides a pulse dimming circuit and a method thereof. The pulse dimming circuit is compatible for both DC input signal and PWM input signal using only one circuit board, and includes a first input port, a second input port, a comparison signal... | 01/17/2012 |
| 8093823 | Light sources incorporating light emitting diodes A light source including at least one light emitting diode and, optionally, a housing portion surrounding the light emitting diode. The at least one light emitting diode can be an organic light-emitting diode sheet. The at least one light emitting diode is preferabl... | 01/10/2012 |
| 8076863 | Back light module A back light module is provided. The back light module includes a plurality of light source matrixes, a current adjusting circuit and a light source driving circuit, wherein each of the light source matrixes includes N light emitting units and N is an integer greate... | 12/13/2011 |
| 8063574 | Light emitting diode illuminating device An exemplary light emitting diode illuminating device includes a light emitting diode (LED) light source, a heat dissipating device, a temperature detector, a power supply and a pulse width modulator. The heat dissipating device is thermally connected to the LED lig... | 11/22/2011 |
| 8054000 | Flash lamp irradiation apparatus A flash lamp irradiation apparatus comprises at least one flash lamp having a bulb made of translucent material, two or more trigger members disposed along a tube axis of the at least one flash lamp, wherein voltage is simultaneously impressed to the two or more tri... | 11/08/2011 |
| 8049431 | Apparatus and method for driving a light source, and display apparatus using the same An apparatus and a method for driving a light source are provided. The apparatus includes a power converting unit which converts a direct current (DC) power into an alternating current (AC) power for driving the light source, and a control unit which controls the po... | 11/01/2011 |
| 8018175 | LED regulation circuit and method An LED regulation circuit and method include a voltage transformation unit to receive DC power and provide a constant current to drive at least one LED and a pulse-width modulation unit to generate a driving signal to control the voltage transformation unit. The dri... | 09/13/2011 |
| 7994730 | Pulse width modulation (PWM) closed loop LED current driver in an embedded system Methods and systems for providing stable and accurate low noise DC reference voltage are described. In the described embodiments, a feedback controlled DC reference voltage supply provides a stable and well controlled sense current. The sense current is in turn used... | 08/09/2011 |
| 7986103 | Method for driving a lamp in a lighting system based on a goal energizing level of the lamp and a control apparatus therefor A method and a control apparatus for driving a lamp 14 in a lighting system, in particular a lamp having a fast response to a change of an amount of energy supplied through the lamp, in which a device controller 8 is connected with the lamp 14. ... | 07/26/2011 |
| 7960918 | Electronic device and light emission control method for electronic device An electronic device, and a corresponding light emission control method for the electronic device, emit light by utilizing recombination of electrons and holes the device and method input a pulse-shaped driving signal having a duty ratio higher than or equal to 0.7 ... | 06/14/2011 |
| 7936131 | AC power feedback control device An AC power feedback control device for a vacuum fluorescent display is provided. In the AC power feedback control device, the Class-D drivers are driven by the PWM controller so as to generate a sine wave voltage. After being filtered by the LPFs, the sine wave vol... | 05/03/2011 |
| 7928663 | Lighting dimmer adaptable to four wiring configurations A lighting dimmer (52) adaptable to four wiring configurations is capable of use in serial or parallel lighting circuits and in place of two-way or three-way switches. The dimmer operates in series when one active input wire (H) is connected and in parallel w... | 04/19/2011 |
| 7898186 | Circuit arrangement and method for the operation of a high-pressure gas discharge lamp A circuit arrangement for providing a lamp wattage to a high-pressure gas discharge lamp (Lp), the arrangement includes an inverter (T1, T2) which supplies to the high-pressure gas discharge lamp (Lp), a lamp current (IL) which is essentially an altern... | 03/01/2011 |
| 7750578 | Discharge lamp ballast apparatus A discharge lamp ballast apparatus has a reflecting mirror 2 and a power source circuit 5. The reflecting mirror 2 is disposed around a discharge light bulb 1 in such a manner as to cast light from the discharge light bulb 1 in one... | 07/06/2010 |
| 7723925 | Multiple location dimming system A multiple location dimming system comprises a plurality of dimmers coupled between an AC power source and a lighting load. Each of the plurality of dimmers is operable to control the intensity of the lighting load and comprises a controllably conductive device, e.g... | 05/25/2010 |
| 7710045 | Illumination assembly with enhanced thermal conductivity Illumination assemblies include a substrate having a first and second electrically conductive layer separated by an electrically insulating layer. The insulating layer includes a polymer material loaded with thermally conductive particles. At least a portion of the ... | 05/04/2010 |
| 7633238 | Lamp driving device and display apparatus having the same A lamp driving device includes first, second, and third voltage converters. The first voltage converter converts a direct current (DC) power voltage to a first pulse voltage. The second voltage converter converts the DC power voltage to a second pulse voltage. The t... | 12/15/2009 |
| 7609007 | Dimmer adaptable to either two or three active wires A dimmer (42) adaptable to either two (H, DH) or three (H, N, DH) active wires includes a first full-wave rectifier (D1, D2, D3, D4) across an AC power hot (H) terminal and a dimmer hot (DH) terminal and a second full-wave rectifie... | 10/27/2009 |
| 7501773 | Multistrike gas discharge lamp ignition apparatus and method A gas discharge lamp has a gas and has a cathode, an anode, and an ignition electrode. Individual discharges of a series of lamp discharges are spaced at least one millisecond from each other, and the individual discharges are generated by providing an electrical ch... | 03/10/2009 |
| 7449841 | Charge limited high voltage switch circuits High voltage switches are configured with a junction transistor driven with a transformer coupled AC drive signal in the common base configuration or driven by a capacitor coupled charge pump. The high voltage switches may be configured as half wave or full wave swi... | 11/11/2008 |
| 7436130 | Cold-cathode tube lighting device for use in a plurality of cold-cathode tubes lit by two low-impedance power sources A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a dire... | 10/14/2008 |
| 7432663 | Circuit for igniting a high intensity discharge lamp A circuit (300) for igniting a high intensity discharge (HID) lamp comprises input terminals (302,304), output terminal (306,308), a charging circuit (RIGN,CIGN), a transformer (320) having a primary winding (322 | 10/07/2008 |
| 7425804 | Lamp drive device of projector A projector includes a lamp drive circuit which drives a lamp, and a lamp drive current detection unit which detects the lamp drive current. Based upon the lamp drive current which is detected, the lamp drive circuit controls the lamp drive current by PWM control, s... | 09/16/2008 |
| 7423385 | System and method for controlling voltage on discharge capacitors which control light energy from flash lamps A system and method are described for controlling voltage on discharge capacitors which control light energy from flash lamps, wherein the method includes measuring over time an operational behavior of a flash lamp for performing photothermolysis, wherein a discharg... | 09/09/2008 |
| 7408329 | Power supply unit for gas discharge processes A method of generating an output DC voltage of a gas discharge process voltage supply unit, in which in a first voltage transformation stage a first DC voltage is transformed into a second DC voltage of a predetermined voltage range, and the output DC voltage is gen... | 08/05/2008 |
| 7408309 | Input current limiting circuit and driving device using the same A driving device for driving a light source module (12) includes an input current limiting circuit (10) and an inverter (11). The input current limiting circuit includes an input current sensing circuit (100) and a feedback compensation c... | 08/05/2008 |
| 7402956 | Ballast with zero voltage switching converter A ballast (10) for powering at least one gas discharge lamp (20) comprises a switching converter (100) and an inverter (900). Switching converter (100) includes a transistor (130) and a control circuit (200) that prov... | 07/22/2008 |
| 7391164 | Visual notification methods for candy-bar type cellphones A wireless handheld communications device with a liquid crystal display, especially, a field sequential liquid crystal display, includes a visual notification for a powered up, inactive state. The visual notification is preferably through a light emitting diode that... | 06/24/2008 |
