Abstract: A compact gas discharge lamp (301) comprising four (or more) interconnected tube segments (11, 12, 13, 14) is provided with an external electrode (310) that extends at least throughout the length of the tube segments and that is in contact with all tube segments. Several embodiments of the external electrode are disclosed. The external electrode is preferably connected to a node (C) midway between the lamp electrodes, to which end a capacitive divider (441, 442) is arranged in parallel with the lamp.

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: A driver for driving a light emitting device includes an output stage and a driving stage. The output stage is for outputting a driving current to the light emitting device according to a driving signal, wherein the light emitting device is coupled between the output stage and a second reference voltage different from the first reference voltage. The driving stage is for generating the driving signal to the output stage, wherein one of the third reference voltage and the fourth reference voltage is within a range between the first reference voltage and the second reference voltage, and the other of the third reference voltage and the fourth reference voltage is outside the range between the first reference voltage and the second reference voltage.

Abstract: Various embodiments of the present disclosure pertain to converting output of a triode-for-alternating-current (TRIAC) dimmer to adjust lighting of one or more light-emitting diodes (LEDs). In one aspect, a method may receive a user-adjustable first signal from a dimmer, the first signal having an alternating current (AC) parameter that is adjustable by a user input to the dimmer; convert the first signal to a second signal that has a direct current (DC) parameter; and control operations of a load based at least in part on the second signal.

Abstract: A high-efficiency ballast arrangement for a lighting fixture has an automatic polarity protection circuit for supplying an output DC voltage of constant polarity no matter in which orientation the fixture is mounted in a DC-powered suspended ceiling system having a DC power supply. A main DC ballast circuit includes a main DC ballast powered by the output DC voltage from the protection circuit to enable a lamp in the fixture to be illuminated during normal operation. An emergency back-up DC ballast circuit includes a battery charged to a charged DC voltage by the output DC voltage during the normal operation, and an emergency DC ballast powered by the charged DC voltage from the battery to enable the lamp in the fixture to be illuminated during emergency operation upon failure of the DC power supply.

Abstract: A flow tube apparatus may include a flow tube having a first opening and a second opening, a corona electrode provided in the flow tube, a collecting electrode provided in the flow tube, and at least one focusing electrode provided in the flow tube to guide ions and thereby provide an ionic wind. In at least one embodiment, the flow tube apparatus may be provided in an electronic apparatus to provide an air flow.

Abstract: Energy sharing circuits and related methods are disclosed herein. A high voltage can be selectively coupled to a first source line and a low voltage can be selectively coupled to a second source line during a first time period. During a subsequent time period, a first coupling switch is activated to inductively couple the first source line to the second source line and diode block the second source line from the first source line. During a subsequent time period, the low voltage is selectively coupled to the first source line and the high voltage is selectively coupled to the second source line. During a subsequent time period, a second coupling switch is activated to inductively couple the second source line to the first source line and diode block the first source line from the second source line.

Abstract: A lighting system for vehicles includes a housing having a front panel and a back panel, a reflector positioned adjacent the back panel, a plurality of light sources positioned on sides of the housing transverse to the back panel, a lens positioned the plurality of light sources and the front panel, a faceplate having a transparent pattern is configured to couple to the housing adjacent the front panel, a controller coupled to the light sources having a first input configured to couple to a vehicle ignition switch and a second input configured to couple to an accessory switch, and a color mapping interface coupled to the controller and configured to receive at least one removable color chip. The controller detects at least one color signal from the at least one removable color chip and controls the plurality of light sources in response to the at least one detected color signal.

Abstract: An egress lighting system which utilizes an efficient primary and emergency light source and complies with the NEC standards for emergency egress lighting. This invention combines two sets of LEDs onto a single circuit board to provide primary lighting and secondary emergency egress lighting while keeping the circuits of the primary and secondary lighting electrically separate or isolated.

Abstract: In accordance with one aspect of the present exemplary embodiment, an LED lamp is provided. In one embodiment, the LED lamp is made to be mounted in a traffic signal housing that includes other lamps, where the LED lamp can be red, yellow, green or another color and can represent a full ball aspect, an arrow aspect or another aspect. The LED lamp is adapted to be powered by an external power source and includes an input power circuit receiving an input voltage from the external power source. The input power circuit includes a power detection circuit that is adapted to determine a power state of the traffic LED lamp. The LED lamp further includes an LED load and a battery powered driving circuit. The battery power driving circuit drives the LED load if the power state of the LED lamp is in a power failure state.

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: A low-version reader (LVR) includes a frame adapted to be worn by a person as well as first and second light sources supported by the frame and positioned to project light beams focusing on a working surface. The LVR also includes a first battery embedded in the frame and a first power-supply circuit that regulates power provided by the first battery to energize the first light source. The first battery is rechargeable and in electrical communication through a first discharge path with the first light source. The first discharge path allows the first battery to energize the first light source. A first charger receptacle in electrical communication through a first charge path with the first battery. The first charge path allows charging the first battery when a power charger is coupled with the first charger receptacle.

Abstract: An LED lighting arrangement comprising at least one LED, for producing light is disclosed. A power supply provides power for the at least one LED. At least one control circuit is coupled to the at least one LED in a way that directly or indirectly uses, to power the at least one control circuit, one or more forward voltage drops across the at least one LED. Beneficially, one or more additional control circuits can be added without redesign of the power supply for the at least one LED.

Abstract: One aspect relates to combining an at least one primary general illumination lighting with an at least one LED-based secondary general illumination lighting. The aspect further comprises sensing an at least one sensed electric characteristics used to produce the at least one primary general illumination lighting. The aspect further comprises controlling an optical characteristic of the at least one LED-based secondary general illumination lighting at least partially responsive to the sensing the at least one sensed electric characteristics used to produce the at least one primary general illumination lighting.

Abstract: A light emitting device which can emit light of an arbitrary color temperature and a process for producing a light emitting device which can emit light of an arbitrary color temperature are provided. Such a light emitting device includes a first light emitting diode device (2) and a second light emitting diode device (3) which are connected together in parallel, and a power-supply apparatus (4) which is capable of reversing polarity, in which the color temperature of the first light emitting diode device (2) is set to be higher than the color temperature of the second light emitting diode device (3).

Abstract: An image display apparatus includes a rear plate including electron-emitting devices, a face plate including an anode electrode, a voltage applying unit configured to apply a voltage to the anode electrode, a switching unit configured to switch between a display state of displaying an image and a non-display state of displaying no image, and a timing unit. The timing unit measures a non-display time, which is an amount of time that the switching unit allows the non-display state to continue. After the timing unit has measured a certain non-display time, the voltage applying unit applies, to the anode electrode, a second voltage lower than a first voltage to be applied in the display state, to enable the electron-emitting devices to emit electrons.

Abstract: A device comprising a solid state or mechanical switch coupled to a first connector and a second connector and at least one lighting device such as an LED light source wherein when power is applied to the first connector, the switch is operable to direct power to the lighting device and to a portion of the pins of the second connector. By constructing the connectors as similar, but with opposite genders, the connectors can be disposed on a circuit assembly to allow for daisy chaining a series of luminaire assemblies together. The connectors may be Ethernet connectors and the switch may be operable through control signals coupled to the Ethernet connector such that a smart power controller operating using power over Ethernet (POE) can operate to control the light sources.

Abstract: A LED driving topology includes a LED array and a current source connected in series between two power inputs receiving a positive voltage and a negative voltage respectively. This topology increases the voltage difference across the LED array and hence has the capability of lighting up more serially connected LEDs, without requiring an additional boost circuit or a high voltage. In addition, the circuit of the current source can be made by a low-voltage manufacturing process.

Abstract: In a display device including a substrate, a pixel portion, and a driver circuit having first to ninth transistors and first and second inverters, the various transistors are configured such that one of a source and a drain of the fifth transistor is electrically connected to a gate of the first transistor. In embodiments, the electrical connection may be a direct connection. Additionally, a switch may be provided that is directly connected to an output terminal of the second inverter.

Abstract: For efficiency improvement of a LED display system including a charge pump and a LED connected to either the voltage input terminal or the voltage output terminal of the charge pump, either one or both of two current regulators are enabled according to a voltage detected from the LED, for establishing a driving current for the LED. When the detected voltage is higher than a threshold, the first one of the current sources is enabled sole. When the detected voltage is lower than the threshold, the second one of the current sources is enabled sole, or both the current sources are enabled, or the current sources are alternatively enabled.

Abstract: A flashlight having a locking mechanism for securing a head skirt to a head assembly is disclosed. A circuit for temporarily remember the mode of operation of the flashlight is also disclosed.

Abstract: A solar light bar includes a battery isolator adapted to be connected between a bus and a vehicle charging system for isolating a vehicle battery from the bus and for selectively connecting the bus to the charging system. A light source switch connects the light source and the bus for selectively electrically connecting the light source to the bus. When the light source switch is closed, the light source is energized by electricity from at least one of the solar panel, the charging system and the auxiliary battery. When the light source switch is open the light source is isolated from the bus. The auxiliary battery is adapted to be selectively charged by electricity from at least one of the solar panel and the charging system.

Abstract: Organic light emitting diode (OLED) light source includes a plurality of stacked organic light emitting diode units comprised of a removable topmost organic light emitting diode unit and one or more removable underlying organic light emitting diode units. A power source is in electrical communication with the anode and the cathode of the topmost organic light emitting diode unit, wherein the underlying organic light emitting diode units are free from contact with the power source. As such, each OLED is sequentially operated upon removal of the topmost OLED unit, thereby providing redundancy as well as extending the operating lifetime of the OLED light source. Also disclosed are processes for operating the OLED light source.

Abstract: A semiconductor device with high function, multifunction and high added value. The semiconductor device includes a PLL circuit that is provided over a substrate and outputs a signal with a correct frequency. By providing such a PLL circuit over the substrate, a semiconductor device with high function, multifunction and high added value can be achieved.

Abstract: A driving circuit is adapted to drive a current-driven device. The driving circuit includes a first power supply circuit and a second power supply circuit. The first power supply circuit is for supplying a first positive voltage to a first terminal of the current-driven device. The second power supply circuit is for enabling a current flowing along a first current flow direction in a first time period and thereby a second terminal of the current-driven device is given a second positive voltage. The second power supply circuit further is for enabling a current from the current-driven device flowing out of the second power supply circuit along a second current flow direction. The first current flow direction and the second current flow direction are different directions in the second power supply circuit. Moreover, a light emitting device using the above-mentioned driving circuit also is provided.

Abstract: An OLED display includes an OLED panel, two conducting wires and a power supply. A display region of the OLED panel is divided into two sub-display regions. The two conducting wires are both disposed on the panel and out of the display region, and first terminals of the two conducting wires are electrically coupled to pixels in the first sub-display region and the second sub-display region respectively. The length of a conducting wire is longer than that of another conducting wire so that the resistance of the conducting wire is larger than that of the said another conducting wire. The power supply provides a relatively high voltage and a relatively low voltage to the second terminals of the relatively long conducting wire and the relatively short conducting wire respectively, so that the voltages of the first terminals of the two conducting wires are substantially the same.

Abstract: There is provided an organic light emitting display device for providing a compensation period of a threshold voltage. The organic light emitting display device includes: a scan driver configured to supply a plurality of scan signals to a plurality of scan lines, each of the scan signals having a width greater than two horizontal periods; a data driver configured to supply a plurality of data signals to a plurality of data lines; and a pixel including an organic light emitting diode, a pixel circuit having a first transistor for controlling an amount of current supplied to the organic light emitting diode, and a compensation circuit configured to control a voltage of a gate electrode of the first transistor to compensate for deterioration of the organic light emitting diode; wherein the scan driver is configured to supply a current scan signal which partially overlaps in time with a previous scan signal.

Abstract: The present invention relates to a switching mode power supply circuit for a plasma display panel comprising an input unit, a PFC (Power Factor Correction) unit, an output unit and a standby unit, wherein the standby unit includes a standby block for outputting a standby voltage by being connected to an AC filter stage of the input unit, a sequence block for sequentially applying power of the output unit and a control block which is connected between the standby block and the sequence block and inputs the standby voltage outputted from the standby block to the sequence block only in case that a PS_ON signal is applied.

Abstract: There are provided a pixel capable of displaying images with a desired luminance and an organic light emitting display device using the same. In one embodiment, a pixel includes: an organic light emitting diode, a first transistor for controlling an amount of current flowing from a first power source to a second power source via the organic light emitting diode, a second transistor coupled between a first electrode of the first transistor and a data line and configured to be turned on when a current scan signal is supplied a current scan line a third transistor coupled between a gate electrode of the first transistor and a second electrode of the first transistor, a first capacitor coupled between the first power source and the first electrode of the first transistor, and a second capacitor coupled between the gate electrode of the first transistor and the first power source.

Abstract: In embodiments of the present invention improved capabilities are described for autonomous shifting of at least a portion of a lighting load off an energy distribution grid, comprising electrically connecting a lighting device to the energy distribution grid; causing the lighting device to interpret information obtained from an information source proximate the lighting device; and causing the lighting device to select from at least two different power sources based on the interpretation, where selecting may include a sharing of the load between the two different power sources, and where one power source may be the energy distribution grid.

Abstract: An emission control driver including a plurality of stages, each including a first unit adapted to generate a first output signal at a first node thereof based on an input signal, a clock signal, a inverted input signal, first and second power source voltages, a second unit adapted to output an emission control signal based on the first output signal and the input signal, a third unit adapted to transmit the first or second power source to the first unit based on the emission control signal, a inverted clock signal and an inverted emission control signal when a first path between the first power source and the first node and a second path between the second power source and the first node are blocked by the clock signal, and a fourth unit adapted to output a inverted emission control signal based on the emission control signal and the first output signal.

Abstract: The invention relates to a handheld projection system (10) comprising a projection device (14, 18, 20) for projecting an image onto a projection surface (24). The projection device has at least two drive power modes associated with different qualities of the projected image. The handheld projection system further comprises a selection device (17) for selecting one of said at least two drive power modes on the basis of the currently selected power source of the system, so that the quality of the projected image is adjusted on the basis of the power source of the handheld projection system. The handheld projection system according to the invention may easily be adapted to different situations of usage involving different requirements when it comes to projected image quality and device properties.

Abstract: A flat panel display device in which a cathode line and a power line are arranged such that voltage drops therein compensate each other. The flat panel display device of the present invention includes an insulating substrate having a pixel region in which pixels are arranged; a power line for supplying a power supply voltage to the pixels; and a cathode electrode having a cathode contact for supplying a cathode voltage to the pixels, wherein an input side of the power line and the cathode contact of the cathode electrode are arranged on the substrate opposite each other with respect to the pixel region. The cathode electrode further includes a cathode bus line for applying an external cathode voltage, the cathode electrode being in contact with the cathode bus line via the cathode contact to provide the external cathode voltage to the pixels.

Abstract: A backup ballast used with a primary ballast for providing power to one or more lamps. The backup ballast includes an output switch and a delay circuit. The output switch has a first operating mode for connecting a primary power source via the primary ballast to a first set of the lamps and second operating mode for connecting a backup power source with a second set of the lamps. The output switch operates in the first operating mode when it is energized and in the second operating mode when said it is not energized. The delay circuit is adapted for connecting to the primary power source for receiving power therefrom. The delay circuit is connected to the output switch for energizing it while the power is being received and for a delay period thereafter. The delay circuit includes an energy-storage component for storing energy while the power is being received and discharging the stored energy when the power is not being received in order to energize the output switch for the delay period.

Abstract: A lantern having a plurality of removable area lights. Each area light includes a separate power source capable of powering the area light. Each area light is separately selectively illuminable by activating a switch on the area light. The lantern includes a docking station having a docking station power source capable of simultaneously powering all area lights attached to the docking station simultaneously or any subset of the area lights attached to the docking station.

Abstract: A color field emission display includes a sealed container having a light permeable portion and at least one color element enclosed in the sealed container. The color element includes a cathode, at least two anodes, at least two phosphor layers and at least two CNT strings. The phosphor layers are formed on the end surfaces of the anode. The CNT strings are electrically connected to and in contact with the cathode with the emission portion thereof suspending. The phosphor layers are opposite to the light permeable portion, and one emission portion is corresponding to one phosphor layer. The luminance of the color FED is enhanced at a relatively low voltage.

Abstract: Improved power distribution architectures for the uniform delivery of single frequency RF power to plasma chambers are disclosed. The architectures include feeding into multiple points across a single large-area electrode, multiple electrodes driving a common plasma discharge as well as multiple coils driving a common plasma discharge. The time-averaged electromagnetic field distribution may be controlled using an array of generator and match (delivery) systems, one of which may be capable of absorbing net power and presenting controlled impedance to the plasma load. In variations, an M+N port network (with M the number of generators and N the number of feed points on the electrode) may be implemented to level the power required from each generator while maintaining a desired field strength distribution.

Abstract: A circuit arrangement for operating a high-pressure discharge lamp with an operating circuit for the high-pressure discharge lamp with an input for receiving a switch-on/switch-off signal for the high-pressure discharge lamp and at least one output for providing an operating signal to the high-pressure discharge lamp, wherein the operating circuit is designed to reduce the power of the operating signal provided at the at least one output once a switch-off signal has been received at its input, wherein the operating circuit furthermore designed to provide the operating signal as an AC signal above a predeterminable power threshold value and as a quasi DC signal below the predeterminable power threshold value.

Abstract: A system for controlling solid state lighting comprises a source (1) to supply any one of a range of AC or DC voltages to a plurality of light strings (3, 4, 5). The source (1) includes a power factor correction circuit 14 for controlling the power factor to the system and a separate transformer (15, 16, 17) for each light string (3, 4, 5). The current that can pass through each LED string (3, 4 and 5) is independently limited by each corresponding LED driver circuit (6, 19 and 20). The current through each LED string (3, 4 and 5) can be modified according to a feedback monitor system (18, 21 and 22) that measures parameters such as LED characteristics, forward current, temperature, and LED output intensity/colour.

Abstract: A compact gas discharge lamp (301) comprising four (or more) interconnected tube segments (11, 12, 13, 14) is provided with an external electrode (310) that extends at least throughout the length of the tube segments and that is in contact with all tube segments. Several embodiments of the external electrode are disclosed. The external electrode is preferably connected to a node (C) midway between the lamp electrodes, to which end a capacitive divider (441, 442) is arranged in parallel with the lamp.

Abstract: An electronic ballast for an HID lamp is described, comprising: a rectifier circuit; a PFC power factor correction circuit increasing the direct current (DC) voltage coming out from the rectifier circuit; a current converter receiving the high voltage DC and converts it to alternating current (AC) to be supplied to the lamp; an ignition circuit generating ignition pulses being fed to the converter circuit to turn on the lamp, the pulses are generated by a downward frequencies scan, and, a control circuit commanding the operation of the ignition circuit and controlling the power being supplied to the lamp according to a power profile being determined by the lightning conditions desired to be obtained from said lamp to save energy. The operative method for the ballast is also described.

Abstract: A white-light electro-luminescent lamp having an adjustable spectral power distribution, including a first light-emitting element which emits light within each of three wavelength bands, 1) between 440 and 520 nm, 2) between 520 and 600 nm, and 3) between 600 and 680 nm. A second light-emitting element emits light within each of three wavelength bands, 1) between 440 and 520 nm, 2) between 520 and 600 nm, and 3) between 600 and 680 nm. A controller modulates the integrated spectral power of the light produced by the first and the second light-emitting elements such that the spectral power distribution of the light formed by combining the light produced by the modulated first and second light-emitting elements is substantially equal to a CIE standard daylight spectral power distribution for correlated color temperatures between 4000K-9500K.

Abstract: Circuit arrangement or circuit, in particular driver circuit, and a method for controlling at least one light-emitting component, such as an electro-optical transducer, a light-emitting diode (LED), an electroluminescent diode, a laser, or a semiconductor laser, by switching a switching element between a first switching position and a second switching position, and the voltage supply is effected by a supply element, such as a voltage source or a current source supported by a decoupling capacitor on the output side, so that current drain and output resistance are as low as possible, so that the highest possible frequency or switching speed as well as the highest possible output voltage for the light-emitting component can be achieved, the light-emitting component is controlled by varying its operating voltage, in particular by switching between the switching positions, and the first and second switching positions are of low impedance for the operating frequency.

Abstract: Variation occurs in transistor characteristics. The present invention relates to a signal line driver circuit comprising a plurality of current source circuits respectively corresponding to a plurality of wirings, characterized in that: the plurality of current source circuits each comprise capacitor means and supply means; and the plurality of current source circuits each convert a supplied current into a voltage in accordance with a video signal, and supply a current corresponding to the converted voltage.

Abstract: The present invention relates to an emergency lighting system comprising one or more first lighting elements and a power supply/charging unit that is incorporated in a host lighting fixture having one or more second lighting elements such as an HID, incandescent or fluorescent lamp. Optionally, a heating element can be provided that allows operation of the system in temperatures too low for operation of conventional emergency lighting systems.

Abstract: For efficiency improvement of a LED display system including a charge pump and a LED connected to either the voltage input terminal or the voltage output terminal of the charge pump, either one or both of two current regulators are enabled according to a voltage detected from the LED, for establishing a driving current for the LED. When the detected voltage is higher than a threshold, the first one of the current sources is enabled sole. When the detected voltage is lower than the threshold, the second one of the current sources is enabled sole, or both the current sources are enabled, or the current sources are alternatively enabled.

Abstract: A lighting device (100) includes a housing (100), a battery receiving region (108), an active electrical circuit (202), and a light source (118). The active electrical circuit (202) uses energy from batteries (110) received in the batter receiving region (110) of the flashlight (100) to power the light source (118). The electrical circuitry of the flashlight (110) is energy limited so that the flashlight is intrinsically safe for use in hazardous locations.

Abstract: A control circuit for control of light-emitting diodes has a first LED string (50) with at least one LED (51, 52, 53) and a first supply device (1) for supply of current to the first LED string (50). The supply device (1) has a control input (10) for delivery of a first control signal (CTL) and is provided for delivery, as desired, of a first supply current (IV1) or a second supply current (IV2) in dependence on the first control signal (CTL). The first and the second control currents (IV1, IV2) are non-zero.

Abstract: A drive circuit for a fluorescent display that can prevent generation of reactive power in a Zener diode used to generate a cutoff bias voltage. In one embodiment, the drive circuit operates as a single ended primary inductor converter (SEPIC) circuit and includes an input side closed circuit, an output side closed circuit, and a coupling capacitor connecting the two closed circuits. The input side closed circuit includes an input power source, a first inductor and a switching element. The output side closed circuit includes a second inductor, a diode and a second capacitor. A filament of the fluorescent display is connected to the second capacitor. One end of a Zener diode is connected to a negative potential side of the filament and the other end of the Zener diode is connected to an input power source.

Abstract: A load control device for controlling the amount of power delivered to an electrical load from a source of AC power comprises a controllably conductive device and a variable gate drive circuit. The controllably conductive device is coupled in series electrical connection between the source and the electrical load to control the amount of power delivered to the load. The variable drive circuit is thermally coupled to the controllably conductive device and provides a continuously variable impedance in series with the control input of the controllably conductive device. The impedance of the variable drive circuit is operable to decrease as a temperature of the controllably conductive device increases and vice versa. Preferably, the variable drive circuit comprises an NTC thermistor. Accordingly, the switching times of the controllably conductive device, i.e.