Abstract: A light emitting diode package includes a mount, a plurality of LED chips, and a first and a second sealants made of different materials. The mount has an accommodation space and at least one partition member to divide the accommodation space into a plurality of separate cavities. The LED chips are placed in the cavities, and emitting beams of the LED chips exiting through the cavities include a first emission with a first wavelength band and a second emission with a second wavelength band, and the second wavelength band is different to the first one. The first and the second sealants are respectively used for sealing at least one of the LED chips placed in at least one of the cavities through which the first or the second emission exits. The first and the second sealants are separate from each other by the partition member.

Abstract: An electronic lamp ballast is provided with first and second protection circuits responsive to mains input fault conditions. A controller includes a first input terminal coupled to a power supply circuit and effective to receive a power supply input voltage provided thereby, and a second input terminal coupled to an output sensing circuit and effective to receive a feedback voltage provided thereby. The first protection circuit includes circuitry to sense a fault condition in a mains power input to the ballast and to discharge the power supply input voltage in response to a sensed fault condition. The second protection circuit includes circuitry to sense a discharge of the power supply input voltage to the controller and to discharge the feedback voltage in response to the sensed discharge of the power supply input voltage.

Abstract: A light source of LED includes at least one first LED and at least one second LED. The first LED has a first optical illuminant characteristic varying with a variable operation voltage from a first level to a second level, wherein the first level is larger than the second level. The second LED has a second optical illuminant characteristic varying with the variable operation voltage from a third level to a fourth level, wherein the third level is smaller than the fourth level. The first LED and the second LED are simultaneously controlled by the same variable operation voltage to produce a light.

Abstract: A light source module includes a casing, at least one reflective layer, a light bar, and at least one light source. The casing has a first side wall and a second side wall, and the first side wall and the second side wall define an opening. The opening faces a light incident surface of a light guide plate, and the first side wall and the second side wall are respectively positioned on two opposite sides of the opening. The reflective layer is formed inside the casing and adjacent to one of the first side wall and the second side wall. The light bar is disposed inside the casing and forms an angle with the light incident surface of the light guide plate.

Abstract: An electronic ballast includes a filament voltage control block having first and second switches and configured to receive a filament voltage control signal. An inverter includes an inverter driver having first and second gate drive output terminals for driving first and second inverter switches, and a gate drive transformer having a primary side coupled to the inverter driver. A first secondary side is coupled to the first inverter switch and a second secondary side is arranged to drive the first switch in the control block. The control block is effective in response to a first control signal state to drive the switches in the control block and generate a lamp filament heating voltage, and is further effective in response to a second control signal state to disable the second secondary side of the gate drive transformer and thereby disable the lamp filament heating voltage.

Abstract: An arc protection circuit is provided for a current-fed, parallel-resonant inverter ballast, the circuit having a lamp signal sensing circuit coupled across one or more lamps and designed to detect a signal through the lamps, a shutdown circuit coupled to the sensing circuit and operable to disable the ballast in response to a disturbance such as an arc in the detected signal, at least a portion of the shutdown circuit defining a first time delay from detection of the disturbance in the signal during which the ballast operates normally, and after which the ballast may be disabled in response to the disturbance; and an automatic restart circuit coupled to the shutdown circuit and operable to enable restarting of the ballast, at least a portion of the restart circuit defining a second time delay during which the ballast remains disabled, after which the ballast may be restarted.

Abstract: A surface light source structure having a circuit board, a first light emitting diode (LED) array, and a second LED array is provided. The first and second LED arrays are assembled on the circuit board. Each LED rows of the two LED arrays has a plurality of LED units connected in series. The LED rows of the first LED array are connected in parallel. The LED rows of the second LED array are connected in parallel. The LED rows of the second LED array are intersected between the LED rows of the first LED array. Positive-to-negative directions of the LED units of the first and second LED array are arranged in opposite directions.

Abstract: A backlight module includes a light guide plate having a light incident surface, a light source module, at least one catch member, and a cushion member. The light source module is disposed adjacent to the light incident surface and has at least one light-emitting element, wherein a light beam emitted by the light-emitting element is capable of entering the light guide plate through the light incident surface. The catch member engages with one end of the light source module, wherein the catch member has at least one extension part extending towards the light incident surface of the light guide plate, and the extension part has an end surface facing the light incident surface. The cushion member is disposed between the light guide plate and the light source module and is adjacent to the light incident surface of the light guide plate and the end surface of the catch member.

Abstract: An arc protection circuit is provided for a current-fed, parallel-resonant inverter ballast. The circuit includes a lamp current rate of change sensing circuit coupled with one or more lamps to detect a total lamp current; a ballast shutdown circuit to disable the ballast in response to a disturbance in the detected signal; a startup delay circuit, at least a portion of which defines a first time delay from a predetermined condition during which the ballast can not be disabled by the shutdown circuit; and an automatic restart circuit to enable restarting of the ballast, at least a portion of which defines a second time delay during which the ballast remains disabled, after which the ballast is restarted.

Abstract: An illumination apparatus includes a light guide plate, a first light source module, and a second light source module. The light guide plate has a first incident surface and a second incident surface opposite to the first incident surface. The first and the second light source modules provide light beams into the first and the second incident surfaces, respectively. The first light source module includes at least one first white light emitting diode (LED) and at least one second white LED neighboring with each other. The first and the second white LEDs have different color temperatures. The second light source module includes at least one third white LED and at least one forth white LED neighboring with each other. The third and the forth white LEDs have different color temperatures. The third and the forth white LEDs are located corresponding to the second and the first white LEDs, respectively.

Abstract: A circuit for preheating filaments in lamps powered by an electronic ballast includes an inverter tank circuit and a preheat tank circuit. The preheat tank circuit has a preheat capacitor connected in parallel with a primary winding of a filament preheat transformer. A cut-back capacitor is connected between the preheat tank circuit and circuit ground. The filament preheat transformer has secondary windings coupled to the first and second lamp terminals to provide a filament preheat voltage. The inverter operates at a preheat frequency during a lamp preheat mode and at a steady-state frequency during a lamp steady-state mode, the steady-state frequency being lower than the preheat frequency. The preheat tank circuit has a natural resonant frequency that is approximately the same as the preheat frequency so that when the ballast is operating in the steady state mode, the filament voltage is substantially lower than when the ballast is operating in the preheat mode.

Abstract: A device having a quartz or glass body forming a chamber hermetically sealed by one or more pinch seals formed in the body wherein a metallic foil provides an electrical connection through a pinch seal. A method is provided for protecting a portion of the metallic foil from corrosion prior to forming the pinch seal by coating at least a portion of the foil with a film comprising silica, and applying a refractory abhesive to at least a portion of the film.

Abstract: A modular electronic ballast is provided for powering a fluorescent lamp. A motherboard is configured to receive an AC input signal, one or more supplemental input signals and a feedback signal from the lamp. A ballast control circuit generates an output signal for an oscillating inverter driving the lamps. A daughter card is coupled to the motherboard and selected from a plurality of daughter cards, each configured to provide a dimming control signal having predetermined characteristics and readable by the control circuit. The daughter cards are collectively configured to provide dimming control signals in response to each of a line-coupled demand response interface, one or more digitally addressable interfaces, analog dimming signals received via said supplemental communications bus, and three-wire phase control signals received via said AC line and said supplemental communications bus. The motherboard is configured to interchangeably receive any one of the daughter cards.

Abstract: An electronic ballast is provided for powering one or more discharge lamps independently connected in parallel. An inverter having a pair of switching elements converts a DC supply signal into AC power. A transformer has a primary winding coupled to an output terminal of the inverter. A load circuit includes independently operable discharge lamp circuits coupled in parallel with each other and across a secondary winding of the transformer. An inductance control circuit includes an inductive element coupled in series with the primary winding of the transformer and a bi-directional switch coupled in parallel across the inductive element. A switch state of the bi-directional switch is controllably adjustable between first and second switch states and in accordance with a desired duty ratio. A magnitude of a voltage across the secondary winding of the transformer and thereby across each lamp circuit is dependent on the switch state of the bi-directional switch.

Abstract: An electrical lead assembly for devices such as electrical lamps having a metallic foil for providing an electrically conducting path through a hermetic seal formed by pinch sealing a vitreous material. The metallic foil includes an oxidation-inhibiting coating of silica. In another aspect of the invention, methods of coating metallic foils with silica are disclosed. In yet another aspect of the present invention, an electrical lead assembly for lamps is provided wherein the metallic foil is extended to form an outer electrical lead for the lamp.

Abstract: An electronic ballast circuit includes a striation reduction circuit that can create an asymmetry in a lamp power signal that powers a gas-discharge lamp. The striation reduction circuit may have first and second circuit paths to cause the asymmetry in the lamp power signal. The first circuit path transmits the AC component signal of an input signal associated with an AC voltage while the second circuit path transmits a DC component signal. A non-linear component in the second circuit path is utilized to generate a harmonic component signal. AC component signal, DC component signal, and harmonic component signal are superimposed onto one another to cause an asymmetry in the lamp power signal that powers the gas discharge lamp.

Abstract: A backlight module includes at least one light emitting element capable of emitting a light beam and a light diffusion brightness enhancement film. The brightness enhancement film includes a light transmissive substrate, a plurality of prism rods, and at least one light diffusion structure. The light transmissive substrate has a first and a second surfaces opposite to each other. The first and the second surfaces are disposed in a transmission path of the light beam. The first surface is disposed between the light emitting element and the second surface. Each of the prism rod extends along a first direction. The prism rods are disposed on the first surface and are arranged along a second direction. The light diffusion structure is disposed on the first surface and between the two adjacent prism rods, and has a rough surface. The light diffusion structure and the rough surface extend along the first direction.

Abstract: A light source module including a planar light source, a heat dissipation medium, and a heat dissipation element are disclosed. The planar light source includes a light box, electrodes, and an insulation layer. The light box has a light emitting surface and a bottom surface opposite to the light emitting surface. The electrodes and the insulation layer are disposed on the bottom surface, and the insulation layer covers the electrodes. The heat dissipation medium is disposed on the insulation layer. The heat dissipation element includes conductive contact portions contacting the heat dissipation medium and a conductive connection portion connecting the conductive contact portions, wherein the orthographic projections of the conductive contact portions and the orthographic projections of the electrodes on the bottom surface are not overlapped by each other, and airflow channels are formed between the conductive contact portions, the conductive connection portion, and the heat dissipation medium.

Abstract: A magnetic component having a magnetic core structure includes a core body with a notched region for reducing non-essential core material. The notched region has the cross-sectional shape of a trapezoid and includes two notch walls separated by a middle wall. The notch walls are each oriented at an obtuse angle relative to the middle notch wall. The core structure reduces the cost of manufacture and the size of the magnetic component by eliminating non-essential core material from regions of the core that have little or no impact on the magnetic performance of the component. The desired magnetic flux path in the component remains substantially unaffected by the removal of the non-essential core material. The body of the core may also include one or more angled shoulders positioned at the corners of the core body to further eliminate non-essential core material.

Abstract: A backlight module includes a panel, a base, at least a light-emitting element, a heat-dissipating board and at least a circuit board. The base is connected to the panel to form an accommodating space. The light-emitting element is disposed in the accommodating space. The heat-dissipating board is disposed on the base and connected to the base. The heat-dissipating board includes at least two connecting portions and a top portion. The connecting portions are respectively connected to two ends of the top portion and the base to separate the top portion from the base for forming a heat-dissipating space therebetween. The circuit board is disposed on an outer surface of the top portion far away from the base.