Abstract: A dimmable LED power supply circuit arrangement is disclosed. The circuit arrangement includes a flyback converter coupled between an input for receiving a rectified alternating line voltage and an output providing power for at least one LED device. The flyback converter includes a transformer and a semiconductor switch for switching a primary current of the transformer. A current sensing unit provides a current sense signal dependent on the primary current. A control unit controls the switching operation of the semiconductor switch dependent on the rectified alternating line voltage and the current sense signal such that the flyback converter operates in a quasi-resonant mode of operation, whereby the current sense signal is compared with a time-varying reference signal representing the rectified alternating line voltage and whereby a switch-off time of the semiconductor switch is determined dependent on the comparison.

Abstract: A TRIAC low voltage dimming control system for effectively controlling the dimming of low voltage lighting using a TRIAC dimmer. The TRIAC low voltage dimming control system generally includes a TRIAC analyzer that applies a test voltage to a TRIAC dimmer and measures the amount of time required for the TRIAC dimmer to conduct electricity. Utilizing the measured time for the TRIAC dimmer to conduct electricity, the TRIAC analyzer is able to calculate an approximate state of the TRIAC dimmer and provide a corresponding level of DC electrical power to a DC load.

Abstract: A bulb lighting device is provided. The bulb device comprises a base, a driving electronics unit comprising a power supply electrically connected to the base and a battery connected to the power supply through a battery management unit, and a communication unit comprising a communication interface and at least one of a wireless unit and a power line unit, wherein the communication unit is electrically connected to the driving electronics unit. The bulb device further comprises an LED module having LED flight sources in an LED array together with an electric driving LED controller arranged inside an at least partially transparent envelope, wherein the LED module is electrically connected to the driving electronics unit, and a motion detector arranged inside the envelope and electrically connected to the driving electronics unit, wherein an output signal of the motion detector is forwarded outside of the bulb lighting device through the communication unit.

Abstract: In embodiments of the present invention improved capabilities are described for systems and methods that employ a control component and/or power source integrated in an LED based light source to control and/or power the LED light source wirelessly. In embodiments, the LED based light source may take the form of a standard light bulb that plugs into a standard lighting socket or fixture.

Abstract: In embodiments of the present invention improved capabilities are described for systems and methods that employ a control component and/or power source integrated in an LED based light source to control and/or power the LED light source wirelessly. In embodiments, the LED based light source may take the form of a standard light bulb that plugs into a standard lighting socket or fixture.

Abstract: Disclosed are LED backlight subassemblies and LCD displays making use thereof. The backlight subassembly includes at least one string of serially connected LEDs in which single LED failures do not lead to a partial or complete loss of image content.

Abstract: A light-emitting diode (LED) dimmer for an LED lighting device, including a power switch, a drive voltage supply, and a LED light-emitting unit. Operating zones of the LED lighting device are changed in accordance with the switching of the power switch, and a dimming level for a next operating zone is determined on the basis of the dimming level and time while the power switch was on during the previous operating period.

Abstract: A light-emitting device includes a mounting area that includes a first end and a second end opposite to the first end, a first electrode group disposed adjacent to the first end of the mounting area, a second electrode group disposed adjacent to the second end of the mounting area, a plurality of files each in that a plurality of light-emitting elements are arranged in the mounting area to extend from a vicinity of the first end of the light-emitting area to a vicinity of the second end of the mounting area and electrically connected in series with each other of the light-emitting elements in each file. Light-emitting elements included in two or more files can be a light-emitting block to be lighted together through electrodes of the first electrode group and the second electrode group.

Abstract: The invention provide a street lighting system that includes a plurality of Light Emitting Diode based street lamps, wherein each of the Light Emitting Diode based street lamps includes a Light Emitting Diode light source, a control circuit connected to the Light Emitting Diode light source and a communication transceiver electrically coupled to the control circuit. The control circuit is enabled to collect data from peripheral devices attached to the Light Emitting Diode based street lamps and transmits the collected data through the communication transceiver.

Abstract: A driving device of a lighting system includes a rectifier circuit, a voltage reducing circuit, a dimmer circuit, and a driver module. The rectifier circuit outputs a pulsating direct current voltage. The voltage reducing circuit is operable to output a reduced direct current voltage associated with the pulsating direct current voltage. The dimmer circuit generates a dimmer signal based on detected occurrence of an interruption to the pulsating direct current voltage. Based on the dimmer signal, the driver module generates a pulse width modulated signal for driving a lighting appliance to generate light with an intensity corresponding to the dimmer signal.

Abstract: The present invention overcomes image defects such as the brightness inclination or smears by reducing the line resistance of a power source bus line which supplies electricity to organic EL elements. A plurality of pixels which are arranged in a matrix array is connected to power source lines, and the plurality of power source lines are connected to a power source bus line. Both ends of the power source bus line are connected to a power source part via a FPC. By supplying electricity to both ends of the power source bus line from the power source part, the line resistance of the power source bus line can be reduced.

Abstract: An intelligent light emitting diode lamp tube compatible to a T5/T8 electronic ballast comprises a tube body, a circuit board provided with at least one LED lamp string to be disposed in the tube body, an integrated circuit disposed on the circuit board, a selection circuit comprising a first conduction loop and a second conduction loop configured with an inductor, and a switch member connected to the integrated circuit. When the intelligent light emitting diode lamp tube is connected to a self-oscillating electronic ballast or an IC-controlled electronic ballast, the internal arithmetic of the integrated circuit can be utilized to conduct the selection circuit and the switch member to change resonance frequency of electrical circuit, so that effects of low power consumption, high adaptiveness and energy conservation can be attained.

Abstract: The present invention relates to an illumination device comprising: a number of light sources arranged in at least a first group of light sources and in a second group of light sources, where said first group of light sources and said second group of light sources are individually controllable; a number of light collecting means, said number of light collecting means collect light from said first group of light sources and convert said collected light into a number of source light beams; at least one light guide comprising an input section and an output section, said light guide receives light generated by said second group of light sources at said input section and said transfer said received light to said output section, said output section being adapted to emit said received light at an area between at least two of said source light beams.

Abstract: A method of controlling a plurality of light fixtures. The method includes detecting the light outputs of a plurality of light fixtures and detecting a reflection of light from a surface. The light outputs and the reflection of light are analyzed. Differences among the light outputs of the plurality of light fixtures are determined, and a difference between the reflection of light and a desired reflection of light is determined. New or updated values for output color, output brightness, and output spectra are determined for the plurality of light fixtures such that the light outputs of the light fixtures are consistent and correspond to a desired light output, and such that the reflection of light corresponds to the desired reflection of light. Each of the plurality of light fixtures is then driven using respective light source output values to produce the desired light outputs.

Abstract: Aspects of the disclosure provide light emitting diode (LED) lighting devices, and methods to drive the LED lighting devices. An LED lighting device includes a transformer having a primary winding on a receiving path to receive electric energy from an energy source and a secondary winding on a driving path. A terminal of the receiving path and a terminal of the driving path have a same voltage level, such as ground. Further, the LED lighting device includes a primary switch configured to switch on the receiving path to receive and store the electric energy in the transformer, and to switch off the receiving path to allow the driving path to deliver the stored electric energy. The LED lighting device also includes an LED array coupled to the driving path to emit light in response to the delivered electric energy.

Abstract: The disclosed lighting device gradually adjusts from an incandescent bulb color having a 30% dimming rate to a daylight color having a 100% dimming rate. The overall dimming rate is changed to a linear shape, and the ratio of the dimming rates of the incandescent bulb color and the daylight color is adjusted. When changing from the incandescent bulb color to the daylight color, the color is changed to an intermediate color that mixes the incandescent bulb color and the daylight color, and then ultimately is changed to the daylight color, and so it is possible to change the dimming rate without causing discomfort or annoyance in humans, and a comfortable and natural light environment is achieved.

Abstract: The invention describes a method of driving an arc-discharge lamp (1), which method comprises the steps of detecting a mechanically induced fluctuation in luminous flux of the lamp (1) occurring as a result of a physical displacement of the discharge arc (2), determining a characteristic (43, 51, 63) of the mechanically induced fluctuation in luminous flux of the lamp (1), and adjusting the lamp power on the basis of the determined characteristic (43, 51, 63) to suppress the mechanically induced fluctuation in luminous flux of the lamp (1).

Abstract: A light emitting diode (LED) lighting apparatus boosts alternating current (AC) power output from a ballast, rectifies the boosted AC power to direct current (DC) power, blocks generation of an inrush current while the boosted AC power is rectified, and controls an operation of an LED by using the DC power.

Abstract: Systems and methods to change a light output level using adaptive frequency control are provided. A switched mode power converter is configured to switch output current to a light emitting diode (LED) module, which includes an LED lighting element, at a switching frequency. Control circuitry is configured to receive a dimming control input that corresponding to a desired light output level of the LED module. The control circuitry is also configured to provide a pulse width modulation (PWM) output configured to pulse width modulate the output current, the PWM output having a pulse width, a PWM frequency, and a PWM period corresponding to the PWM frequency. The control circuitry is also configured to adjust at least one of the PWM period and the switching period in response to a change in the dimming control input, such that a light output level of the LED module is appropriately changed.

Abstract: A system for communicating with a host using control signals over a 1-wire interface is disclosed. The system includes a driver coupled to the host by the 1-wire interface. Control signals are transmitted from the host to the driver for decoding by the driver controller. The control signals are pulse width modulation format signals which are interpreted by the driver as binary encoded command mode signals or analog encoded command mode signals, depending upon when the signals are received in relation to a preamble pulse and a post-amble pulse.