75results about "Electroluminescent light sources" patented technology

Methods and apparatus for executing a lighting program to control a plurality of light emitting diodes (LEDs) in response to at least one characteristic of an audio input. In one embodiment, the audio input is digitally processed to determine the at least one characteristic. In other embodiments, control signals for the LEDs are generated in response to a timer and/or input from a user interface, as well as in response to the at least one characteristic of the audio input. In another embodiment, the control signals for the LEDs are generated by a same computer that processes the audio input to transmit signals to speakers to audibly play the audio input. In a further embodiment, a GUI is provided to assist in authoring the lighting program. In another embodiment, the audio signal is processed before being played back. In a further embodiment, the lighting program anticipates changes in the audio input.

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/OFF of a driving current to each LED of an LED array in response to a comparison result. In this constitution, a large voltage of AC source enables lighting of more number of LEDs, while a small voltage thereof enables lighting of less number of LEDs, thus enhancing power efficiency of the LED lighting device.

A lighting device comprising first, second and third groups of solid state light emitters, the first group emitting light having a dominant wavelength of 430 to 490 nm, the second group at 525 to 575 (in some devices 540 to 575 nm), the third group at 610 to 640 nm. In some devices, wavelength of light from emitters in first and second groups, and light from second and third groups, differs by at least 70 nm. Some devices emit light having CRI Ra of at least 70 when first, second and third groups of emitters are illuminated. Also, a lighting arrangement comprising first, second and third groups as above, in addition to a fourth emitter emitting light of dominant wavelength outside the ranges for the first, second and third groups, and not more than 10 nm different from a dominant wavelength of a color on an item to be illuminated.

The present invention relates to a Light Emitting Diode (LED) selection circuit for an LED driver that drives multiple unequal lengths of LED strings, which selectively turns the LED strings ON and OFF corresponding to an input alternating current (AC) line voltage. The LED driver provides optimal efficiency as input AC line voltage varies from low to high voltages (i.e. 90V to 150V for nominal 120 VAC operation and 190V to 250V for nominal 220 VAC operation). Thus The LED driver can be used internationally since it accepts voltages from virtually every industrialized country in the world. The LED selection circuit in accordance with the present invention comprises a rectifier, multiple LED strings, multiple current sources and a controller. The controller generates multiple signals to the corresponding current source and turns ON and OFF the LED strings.

Light outputs from many LEDs are uniformized and power consumption required for such uniformizing is suppressed, in an LED lighting circuit to be used for illuminating apparatus and the like. Currents flowing from a DD converter to an LED module are detected by a current detection resistor and compared with a reference voltage (Vref) from a reference voltage source by a comparison circuit. Corresponding to the comparison results, a control circuit controls the DD converter, and the currents flowing to the LED module are controlled to be constant currents at the same time. Furthermore, in LED load circuits configuring the LED module, control elements configuring a current mirror circuit are arranged in series, a corresponding control element is permitted to have a diode structure by having a circuit with the highest sum of the LED ON voltages as a reference, the flowing current values of the control elements of the remaining circuits are interlocked, and the LED load circuits are balanced.

The invention enhances a production yield of a display device (an electro-optical device). The invention provides a method of manufacturing an electro-optical device including a display region in which a plurality of basic pixels are arranged, each basic pixel including a plurality of color pixels. The method includes: forming on a first substrate lines to drive a plurality of electro-optical elements respectively constituting the color pixels, correspondingly to the arrangement of the basic pixels; forming on a second substrate, as a chip to be transferred to each basic pixel, a drive circuit to drive the plurality of electro-optical elements which constitutes the plurality of color pixels of the basic pixels to obtain a plurality of basic-pixel driving chips; and transferring step of transferring the respective basic-pixel driving chips from the second substrate onto the first substrate, and connecting the drive circuits to regions of the lines corresponding to the basic pixels.

Solar-powered lighting devices that may be portable and/or collapsible are described. The devices may include a housing including a first wall, a second wall, and one or more side walls between the first wall and the second wall, at least one solar panel to generate solar energy, and a rechargeable battery to store the solar energy generated. The devices may include a plurality of operating modes for controlling lights within the housing, and a microprocessor for controlling the operating modes.

A power and control module for a Power over Ethernet (PoE) light emitting diode (LED) lighting system includes an input channel for receiving PoE input power from a PoE switch, an output channel for providing PoE output power to a plurality of LED light fixtures and a power transfer unit coupled between the input and output channel for providing the PoE input power and/or a secondary input power to the output channel as the PoE output power. A secondary power input unit selectively provides secondary power to the power transfer unit. A processor is controls the power transfer unit to adjust an amount of PoE input power and secondary input power to obtain the PoE output power. Secondary input power can be an emergency power source during line power outages. Secondary input power could be a renewable energy power source used preferentially to the PoE input power when available.

A dimming signal generation device outputs a square wave voltage signal having an on-duty corresponding to a dimming level to a dimming signal line from a time point when a predetermined time period has elapsed after power-up. In the dimming signal generation device, a specific voltage is outputted to the dimming signal line for the predetermined time period after the power-up.

A switching constant-current power device can stabilize current flowing to a load (e.g. a display device comprising an LED, or the like) even when the current is repeatedly interrupted. A voltage current detector is connected to the output side of a power converter and creates a voltage signal in accordance with the output voltage thereof; and a feedback circuit is provided between a controller for driving the power converter and a current detector, which generates a first feedback signal in accordance with the load current. The feedback circuit comprises a signal holding unit, which outputs a second feedback signal that was created by consulting the voltage signal at a given time, the feedback circuit supplying the first feedback signal, output by the current detector, to the controller when load current is flowing, and supplying the second feedback signal, output by the signal holding unit, to the controller when load current is not flowing.

A method for position based management of a plurality of plants being arranged in a controlled environment and subject to light emitted by at least one artificial lighting arrangement. Also, a corresponding mobile electronic device and to a computer program product for position based management of an artificial lighting arrangement arranged to control growth of a plurality of plants in a controlled environment.

Provided is an organic EL device, including: a transparent substrate having a front surface and a rear surface; a first electrode layer, an organic layer including a light emitting layer and a second electrode layer that are formed in order on the front surface of the transparent substrate; and a reflective layer formed on the second electrode layer on a side opposite to the organic layer and having light reflectivity for light incident from the second electrode layer, the first electrode layer and the second electrode layer being formed of a transparent material, light being extracted from the rear surface of the transparent substrate.

A display device element substrate of the present invention includes a plastic film, an adhesive layer formed on the plastic film, a transparent electrode which is formed on or over the adhesive layer and to which a display signal is supplied, and barrier insulating layer patterns formed on respective portions between patterns of a plurality of transparent electrodes, in addition, projection-like resin layers may be formed on the barrier insulating layer patterns.

A clip light, for detachably mounting the clip light to a visor of a cap, includes a light arrangement and a detachable clip member. The light arrangement includes a light housing and a light device supported within the light housing, wherein the detachable clip member is detachably coupling with the light housing, wherein the detachable clip member is adapted to be detached for replacing to another type of clip member for different purposes. The detachable clip member is rotatably coupling with the light housing, such that a projecting angle of the light from the light source is adapted to be adjusted via a rotation manner.

The invention relates to the electronic field, and discloses dimming method and circuit and a controllable silicon dimming circuit with the circuit. The method comprises the steps that a dimming signal is generated according to a current direct current input voltage signal; according to the dimming signal, the voltage average value signal of the dimming signal is generated; the fact that the dimming signal is currently in a positive half cycle or a negative half cycle is determined; when the dimming signal is currently in the positive half cycle, the voltage average value signal is compared with an output current feedback signal which represents the magnitude of the current output current, and a first comparison signal is output; a drive signal is output according to the first comparison signal; when the dimming signal is currently in the negative half cycle, the voltage average value signal is compared with an output current feedback signal which represents the magnitude of the current output current, and a second comparison signal is output; and a drive signal is output according to the second comparison signal. The application of the technical scheme is conductive to eliminating stroboflash.

An aminostyryl compound represented by Formula 1:

The organic light emitting device using the aminostyryl compound exhibits low driving voltage and improved brightness, efficiency, and color purity.

A system for sensing luminaire properties and controlling luminaire performance independently of the location, distance or orientation of the sensors relative to the source luminaire device that is being sensed. Thus, the installer and the maintenance crew are freed from issues and activities associated with sensor installation.

An embodiment of the present invention includes an LED driving device that causes a plurality of LEDs to emit light, wherein the device includes: an LED driving circuit configured to drive the LEDs so that at least one of the plurality of LEDs emits light as a first. LED and an LED around the first LED is prevented from emitting light as a second LED; a photodetection unit configured to detect light emission of the first LED through the second LED and detect a light emission quantity of the first LED; and a controller configured to adjust a light emission quantity of the first LED based on the light emission quantity of the light emission of the first LED detected by the photodetection unit.

The present invention provides a light emitting device (1), wherein a second interlayer insulating film (35), an auxiliary electrode (150) and a common electrode (72) are sequentially stacked on the element layer (30). The end (E4) of the auxiliary electrode (150) is formed so as to be located outside the end (E1) of the common electrode (72) in the plane of the substrate (10), and the end (E1) of the common electrode (72) It is formed so as to be located on the inner side of the end (E2) of the second interlayer insulating film (35). The auxiliary electrode (150) has a portion overlapping and electrically connected to a second electrode power supply line that supplies a potential to the common electrode (72). Accordingly, the frontal edge region of the light emitting device can be reduced, and variations in luminance of the light emitting element can be suppressed.

When supplying an LED light source with a first output voltage that is equal to or higher than a threshold voltage, an LED driver causes a DC power supply to output a first DC voltage and causes a switching regulator to supply the LED light source with the first output voltage. When supplying the LED light source with a second output voltage that is below the threshold voltage, the LED driver causes the DC power supply to output a second DC voltage lower than the first DC voltage and causes the dropper regulator to supply the LED light source with the second output voltage.

A self-heating thermal protector operates to disconnect a load control device for a lighting load from an AC power source when insulation is present around the insulation detector independent of the magnitude of an AC mains line voltage of the AC power source. The insulation detector comprises a temperature-sensitive switch and a constant power circuit that are located in a thermally-conductive enclosure. The temperature-sensitive switch is coupled between the AC power source and the load control device and is rendered conductive and non-conductive in response to a temperature inside the enclosure. The constant power circuit is coupled in parallel with the AC power source and dissipates a constant amount of power independent of the magnitude of the AC mains line voltage when the temperature-sensitive switch is conductive. Restricted airflow over the thermal protector causes the temperature inside the enclosure to increase, such that the temperature-sensitive switch is rendered non-conductive.

The purpose of the present invention is to provide a phase difference film which is not prone to color loss and color shift even in environments with harsh temperature conditions and humidity conditions, which can be manufactured by the melt film formation method. This phase difference film fulfills the relations of expressions (A) and (B) below. Expression (A): 0.7 < R1(450)/R1(550) < 1; Expression (B): |R2(450)/R2(550) - R1(450)/R1(550)| < 0.020

The light intensity level of a dimmable LED bulb is set by interruption of the AC signal by the user. The bulb's driver circuit includes a controller having dimmer control logic for controlling the brightness. Optionally, the LED bulb can be dimmed by an external TRIAC dimmer.