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| Number | Title | Issue Date |
| 7671542 | Color control of multi-zone LED backlight The present invention relates to a light emitting diode (LED) backlight having a plurality of LED strips, in which driving current supplied to each of the plurality of LED strips is adjusted according to measured differences in chromaticity coordinates between the a... | 03/02/2010 |
| 7671541 | Diode lamp for simulating a filament lamp, and lamp monitoring method An LED-based lamp assembly or diode lamp assembly effectively replaces a filament or incandescent type lamp assembly for cabin/compartment reading light applications for reducing power consumption and improving fuel efficiency. The diode lamp assembly comprises a li... | 03/02/2010 |
| 7667415 | Backlight control device and display apparatus A PWM generation circuit is set so as to generate a PWM pulse signal having a frequency that is an odd number times a vertical synchronization frequency. A frequency division circuit frequency-divides the PWM pulse signal generated by the PWM generation circuit. An ... | 02/23/2010 |
| 7667414 | LED lighting apparatus An LED lighting apparatus can be configured to supply a number of LEDs connected in series with a requisite voltage and power even if an amount of forward voltage of the LEDs connected in series is larger than a supply voltage of a battery. The LED lighting apparatu... | 02/23/2010 |
| 7656099 | Circuit arrangement for operating high-pressure discharge lamps and operating method for a high-pressure discharge lamp The invention relates to a circuit arrangement for operating high pressure discharge lamps and corresponding operating method, whereby the input voltage for the pulsed trigger device is increased by means of a series resonance loop (L3, C4), of a casca... | 02/02/2010 |
| 7656100 | System for temperature prioritised colour controlling of a solid-state lighting unit The present invention relates to a system (100) for controlling light output of a lighting system. The system (100) comprises a light mixing circuit (116) comprising a plurality of light sources configured to provide a mixed light output (102... | 02/02/2010 |
| 7656101 | Cold cathode tube drive device A cold-cathode tube drive device includes an inverter circuit (1) for generating a high-frequency voltage, a booster transformer (2) for boosting the high-frequency voltage generated by the inverter circuit (1), a cold-cathode tube (3) wh... | 02/02/2010 |
| 7652437 | Fluorescent tube lamp drive circuit A drive circuit for driving a fluorescent tube lamp comprises a variable frequency oscillator generating a lamp drive frequency, a resonant drive circuit driving the lamp with the lamp drive frequency, and a control unit for driving the variable frequency of the lat... | 01/26/2010 |
| 7642732 | Dielectric barrier discharge lamp lighting apparatus and method of detecting the number of normally lighting dielectric barrier discharge lamps A dielectric barrier discharge lamp lighting apparatus includes twenty-four dielectric barrier discharge lamps, and a ballast circuit for lighting the twenty-four dielectric barrier discharge lamps which includes a DC power supply, an inverter circuit, a step-up tra... | 01/05/2010 |
| 7642733 | Driving circuit for light emitting device with compensation mechanism and driving method thereof A light emitting device driving circuit, includes: a switch device, a comparator, a driving module, a time counting circuit and a compensation module. The switch device is turned on or off according to a control signal for controlling a driving current flowing throu... | 01/05/2010 |
| 7642731 | Inverter for driving lamp and method for driving lamp using the same A lamp driving method and an inverter for driving the lamp are disclosed which can stably maintain a desired duty ratio of a pulse width modulation (PWM) signal for controlling driving of a lamp. The method for driving lamp, comprising: generating an inner pulse wid... | 01/05/2010 |
| 7638955 | Backlight control circuit with feedback circuit An exemplary backlight control circuit (20) includes at least two sampling circuits (21), at least two feedback circuits (22), and a PWM IC (23). Each of the sampling circuits includes a sampling output (210) and a backlight lamp (... | 12/29/2009 |
| 7626345 | LED assembly, and a process for manufacturing the LED assembly A manufacturing process for storing measured light output internal to an individual LED assembly, and an LED assembly realized by the process. The process utilizes a manufacturing test system to hold an LED light assembly a controlled distance and angle from the spe... | 12/01/2009 |
| 7615939 | Spectrally calibratable multi-element RGB LED light source An LED lighting system is disclosed. The lighting system includes means to calibrate the light temperature and intensity between multiple modules in one system, or to calibrate the light temperature and intensity against a known reference standard. The lighting syst... | 11/10/2009 |
| 7609008 | Method and circuit for controlling an LED A control circuit coupled to a power line controlled by a dimmer having a switching device includes, for example, an active power factor correction circuit receiving power from a bridge rectifier and storage capacitor and drawing an average continuous current when t... | 10/27/2009 |
| 7605548 | Electricity controller, device for lighting discharge tube, display device and electric power control method An electricity controller is provided which comprises a first power control means for controlling output power from power generator 4 to a first level during a first period of start-up time for feeding, a second power control means for controlling output powe... | 10/20/2009 |
| 7605549 | System and method for current and/or temperature control of light fixture A system for current and/or temperature control of light fixtures includes a sensor in communication with a light fixture, sense a current flow or a temperature of the light fixture, and communicate an input signal relative to the current flow or the temperature; a ... | 10/20/2009 |
| 7598684 | Methods and apparatus for controlling devices in a networked lighting system Methods and apparatus for computer-based control of light sources in a networked lighting system. In one example, a plurality of LED-based lighting systems are arranged as computer controllable “light strings.” Applications contemplated for such light strings in... | 10/06/2009 |
| 7595596 | Power-saving control circuit and method for OLED panel The present invention discloses a power-saving control circuit for an OLED panel, comprising: a plurality of OLEDs respectively located in a corresponding plurality of paths; a current amount determination circuit determining current amounts on the plurality of path... | 09/29/2009 |
| 7592756 | Driving circuit for light emitting diodes A driving circuit includes a DC-to-DC voltage converter, a current source, a detector and a feedback control circuit. The DC-to-DC voltage converter has a switch and generates a driving voltage on first ends of the series of light emitting diodes, in which a magnitu... | 09/22/2009 |
| 7589480 | High intensity discharge lamp ballast A low current loss ballast operates a high intensity discharge lamp with or without radioactive krypton. A by-pass capacitor in conjunction with a resonant strike circuit limits high frequency ripple applied to a lamp during continuing operation. Different resistor ... | 09/15/2009 |
| 7583035 | System and method for driving LED A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital regulator with at least one of electrical, thermal and optical feedbacks. T... | 09/01/2009 |
| 7579789 | Device for driving light sources A driving device for driving a lamp (L) includes a power stage circuit (21), a transformer circuit (22), a voltage dividing circuit (23), an inrush current sensing circuit (24), and a controller circuit (26). The power stage circui... | 08/25/2009 |
| 7573211 | Backlight control circuit The present invention discloses a backlight control circuit, comprising: a voltage supply circuit, which is a boost converter circuit for receiving an input voltage from an input terminal and generating an output voltage to an output terminal, the output voltage bei... | 08/11/2009 |
| 7573209 | Method and system for feedback and control of a luminaire A method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire comprises one or more light-emitting elements and one or more light sensors which can provide optical feedback, wherein this optical feed... | 08/11/2009 |
| 7573210 | Method and system for feedback and control of a luminaire A method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire includes one or more light-emitting elements and one or more light sensors for providing optical feedback, which is filtered to remove un... | 08/11/2009 |
| 7564198 | Device and method for driving LED An LED lighting device of AC power-driven type having a comparatively simple constitution and a high power efficiency. The device compares a signal voltage (rectified voltage) obtained by rectifying an AC source with a predetermined reference voltage and controls ON... | 07/21/2009 |
| 7564197 | Discharge tube operation device A time division signal (S2) for instructing a lit period and an unlit period of a discharge tube (23) is input to an error amplifier (41) of an integration circuit (40). The integration circuit (40) charges and discharges a capacit... | 07/21/2009 |
| RE40843 | Electronic dimmable ballast for high intensity discharge lamp A dimmable electronic ballast for an HID lamp includes a rectifier stage for rectifying an AC input and providing a rectified DC output, a power factor correction stage for modifying a power factor of the AC input and for providing an increased voltage DC output fro... | 07/14/2009 |
| 7560877 | Operation circuit for a discharge lamp and device for operation of a discharge lamp and a light source device An operating circuit for a discharge lamp having an external auxiliary electrode and main discharge electrodes in a discharge space, in which the disadvantage of lamp damage due to detachment of glass material, such as silica glass or the like, of a hermetically sea... | 07/14/2009 |
| 7560878 | Circuit arrangement and method for operating high-pressure discharge lamps High-pressure discharge lamps may explode at the end of their life. In order to be able to predict an explosion, the gradient of the operating voltage is evaluated. If a risk of explosion is detected, the lamp operation is interrupted. ... | 07/14/2009 |
| 7557522 | Preheat control device for modulating voltage of gas-discharge lamp A preheat control device for modulating the voltage of a gas-discharge lamp is disclosed, which comprises: a pulse-width modulation (PWM) circuit, for controlling the voltage of the gas-discharge lamp while it is operating at a preheat state; a pulse frequency modul... | 07/07/2009 |
| 7554273 | Protection for external electrode fluorescent lamp system The present invention provides a driving circuit with protection function for driving a set of external electrode fluorescent lamps (EEFL). The drive circuit includes: a transformer connected to the set of EEFLs; a switching network connected to the transformer whic... | 06/30/2009 |
| 7550932 | Control method and device for a power-converting module that drives a light-emitting component A control device, which controls a power-converting module that is coupled to a light-emitting component, includes a duration detecting unit and a control signal generator. The duration detecting unit compares the duration of a predetermined logic state of a pulsati... | 06/23/2009 |
| 7548030 | Color control for dynamic scanning backlight A method of controlling the output of a luminaire by receiving a first target signal associated with a first frame; generating a first light output control signal for an on time portion of the first frame, the light output control signal responsive to the received f... | 06/16/2009 |
| 7545106 | Discharge lamp driving device and driving method A discharge lamp driving device for driving a lamp module (23) including a plurality of lamps includes a switch circuit (21), a transformer and filter circuit (22), and a microcontroller (20). The switch circuit converts a received signal... | 06/09/2009 |
| 7541751 | Soft start control circuit for lighting A low voltage lighting system includes a transformer having at least a primary winding and a secondary winding. The low voltage lighting system also includes one or more lighting elements and a voltage control circuit. The lighting elements are coupled to the second... | 06/02/2009 |
| 7535185 | Method and system for implementing power reduction algorithms in a night vision system power system A night vision system comprising a power system having a low voltage unit coupled to a high voltage unit. The low voltage unit includes a low voltage controller and a low voltage table correlating step values to pulse widths, the low voltage controller obtaining a d... | 05/19/2009 |
| 7528557 | Electronic controller for high-power gas discharging lamp An electronic controller for a high-power gas discharging lamp bulb includes a filter circuit to reduce interference and control the electromagnetic characteristics of an input power signal. A rectifier circuit electrically communicates with the filter circuit to ge... | 05/05/2009 |
| 7525261 | Circuit arrangement for operating a high pressure discharge lamp A circuit arrangement for operating a high pressure discharge lamp comprises a down converter equipped with an output capacitor and a commutator equipped with lamp connection terminals. The amplitude of the DC current generated by the down converter is controlled by... | 04/28/2009 |