Abstract: A power source control device for controlling an illuminance of an illuminator by outputting a current for driving the illuminator and by controlling the current, including: a receiver for receiving a wireless signal having a predetermined frequency; a storage section for storing a setting table holding a first code indicating a predetermined device identification code; a control signal generating circuit for comparing a second code included in the wireless signal with the first code to output a control signal when the second code agrees with the first code; and a current outputting circuit for generating and outputting a current according to the control signal generating circuit, wherein the power source control device controls the illuminance of the illuminator according to the wireless signal from a desired wireless signal transmitting device in response to a change of the first coded held in the setting table.

Abstract: An LED drive circuit in which an alternating voltage is input and an LED is driven, and which is capable of connecting to a phase control dimmer. The LED circuit is provided with a current extractor for extracting a current from a power supply feed line for feeding an LED drive current to the LED; and an extraction timing adjuster for operating the current extractor for a predetermined period of time after the start of a voltage fluctuation in the power supply feed line, the voltage fluctuation accompanying output oscillation of the phase control dimmer.

Abstract: A user interface of a configurable light timer is described. The user interface comprises an input portion for receiving timing characterization data, the input portion adapted to receive a portable memory device storing the timing characterization data; a control circuit coupled to detect the portable memory device inserted into the configurable light timer; and an internal memory; wherein the timing characterization data is automatically downloaded to the internal memory after the portable memory device is detected in the configurable light timer. A method of implementing a configurable light timer is also disclosed.

Abstract: The light assembly is designed for use with an integral steam emitter or as an add-on with a steamhead in a pre-existing steambath installation. The assembly includes a part for engaging the end of the steam outlet pipe of a steam generator. A ring-shaped fixture carrying multiple LEDs is mounted on the pipe engaging part. A light transmissive lens is aligned with the light source fixture and has a light emitting edge. The lens has a central opening through which steam from the steam outlet pipe can pass. When the assembly is not used with a pre-existing steamhead, a steam emitter is provided with a steam inlet adapted to extend through the lens opening. The steam emitter has a hemispherical front surface with a steam outlet port located in a recess. The light source can include LEDs of different colors.

Abstract: A lighting device (1) comprises a plurality of LEDs (11-14) producing light (21-24) of mutually different colors. The LEDs are driven in switching cycles (63) with a duty cycle controlled supply current of constant magnitude. In each switching cycle, each LED is first switched ON (61) and then switched OFF (62). In a measuring mode, during one switching cycle (63B), all ON phases of all LEDs are briefly interrupted, except for one LED (11), so that a light sensor (70) measures the light from this one LED. This measurement can be used to adapt the duty cycle of this one LED. In the next switching cycle (63C), the interruption of the ON phases is compensated by extending the ON phases of all LEDs except said one LED, the extension having a duration equal to the duration (?D) of the interruption.

Abstract: A driving method of a light-emitting diode (LED) adapted to a driving apparatus is provided. The driving method includes detecting whether the driving apparatus performs dimming, and if the driving apparatus performs dimming, determining whether a predetermined requirement for dimming control is met or not. When the predetermined requirement for dimming control is not met, respective current magnitudes of a plurality of driving currents are regulated, and each of the driving currents is output for a full time of a period. Conversely, when the predetermined requirement for dimming control is met, each of the driving currents is output for a partial time of a period.

Abstract: Applicant has disclosed a method for controlling on and off times for streetlights by synchronizing these intervals to recent local daylight conditions without any human intervention. The preferred method comprises: sensing, via a photocell, when dusk and dawn occurs; and then, timing or counting the dusk and dawn times per 24-hour cycle, recording that dusk and dawn data, calculating the average dusk-to-dawn interval for a plurality of preceding 24-hour cycles; predicting, the next dusk time; and turning on the streetlight for a preselected percentage of the calculated average dusk-to-dawn interval. Future “on” time periods are repeatedly calculated as a percentage of the dark periods determined on one or several immediately prior nights, and so varies with the seasons. Unlike the prior art, Applicant's streetlight control does not require field programming or field inputs from the installer or time knowledge. It also does not require any external or internal precision clock or calendar.

Abstract: A user interface for implementing a configurable light timer controlling a light is disclosed. The user interface comprises an input portion for receiving timing characterization data, the input portion adapted to receive a portable memory device storing the timing characterization data; an actuator portion enabling a user to enter a current time on the timer; and a display responsive to the actuator portion to indicate the current time. A method of implementing a configurable light timer is also disclosed.

Abstract: A method and circuit to control the intensity of lights, illumination fixtures, and displays using pulses of a fixed duration and a fixed frequency (FD/FF) is provided. In particular, the method may be used to control one more light sources. By varying the number of pulses in a control burst, the total current flowing through the light source may be precisely controlled providing greater accuracy than other methods, such as, for example, PWM or variable pulse frequency. The FD/FF technique may be used in conjunction with any number of light sources, and finds particular application in LED displays and for any type of LED illumination fixture.

Abstract: A terminal apparatus and a computer-readable storage medium capable of achieving reduction of power consumption by appropriately controlling lighting of a display unit are provided. A CPU lights or extinguishes a display unit after the end of an interrupt event in accordance with a lighting state (lighting, dim-lighting, being unlighted) of the display unit when the occurrence of the interrupt event is detected. It is therefore possible for the CPU to perform appropriate display control according to the lighting state when an interrupt event occurs.

Abstract: A portable lighting system including a housing having an elongated slot formed in a surface of the housing. The slot being sized to receive a rod therein via an opening in the slot. The system further including a retention member movable between a closed position and an opened position, wherein the closed position provides at least a portion of the retention member blocking at least a portion of the upper opening of the slot and the opened position includes the retention member not blocking the upper opening of the slot. The system also having a light source including a plurality of lights oriented in different directions.

Abstract: Provided is a discharge lamp lighting device, which can control a load precisely while improving the practicability. When the difference of a count number (Nn) becomes a predetermined threshold value or less, a predictor circuit (35) predicts the timing, at which a current value (iQ1) becomes a peak value, on the basis of the rate of change of the difference. A switch selecting circuit (38), which is driven with a clock frequency higher than the sampling frequency of a first converter unit (32), turns off a field effect transistor (Q1) at the turn-off timing, and turns on a field effect transistor (Q2). A plurality of A/D converters (37a) are subjected to a multi-rate control, thereby to correct the threshold value of the predictor circuit (35) on the basis of the peak value of a lamp current (iOUT).

Abstract: It is provided an LED lighting device calibratable to 0 to 100% of wide range about a chromaticity and luminance of a illumination light by a simple configuration, and a driving method for the LED lighting device. The LED lighting device is provided with a first light-emitting unit and a second light-emitting unit differing a color temperature mutually, and a control circuit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit, and for executing a light control of the first light-emitting unit and the second light-emitting unit by a PNM (Pulse Number Modulation) control in a fixed cycle so as to have a lighting period Ton for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period Toff for quenching both the first light-emitting unit and the second light-emitting unit.

Abstract: A method of, and a device for controlling a shed lighting, and a shed provided therewith. To support daylight, lamps are switched on, but only in the case when the measured intensity is too low and, moreover, the time in which the daylight intensity could become sufficient is too short to achieve a desired period of time with a minimum light intensity. This saves energy and service life of lamps.

Abstract: An apparatus, method, and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a current sensor; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, generates a first control signal to switch a corresponding segment of LEDs into the series LED current path; and during a second part of the AC voltage interval, generates a second control signal to switch the corresponding segment of LEDs out of the first series LED current path.

Abstract: Wireless network used to control multiple lights, includes multiple different networks for different purposes, and interference prevention mechanisms.

Abstract: A portable lighting unit is provided which is configured to attach to cables, railing, tubing or any other fixture. In one embodiment, the lighting unit comprises a first housing comprising a first pair of opposing notches, a second housing comprising a second pair of opposing notches, the first and second housings being attachable together with the notches cooperating to receive the fixture through the notches, a photovoltaic cell mounted to one of the first and second housings, a light source mounted to one of the first and second housings, and at least one rechargeable battery housed within one of the first and second housings, the at least one rechargeable battery electrically coupled to the photovoltaic cell and to the light source.

Abstract: Problem to be Solved: In left and right independent lighting power sources, even when left and right light-emitting units each including one or a plurality of LEDs light up with a time difference, the quality of emission as headlamps is increased by making it difficult to visually identify the time difference. Solution: A DC/DC converter for supplying the electric power supplied by a battery to the light-emitting unit is operated to change the current supplied to the light-emitting unit such that the current is gradually increased to attain a rated current, to thus avoid the case where one of the left and right headlamps enters a lighting state, when the other does not light up yet.

Abstract: A power tool including a motor, light unit, and switch unit for selectively connecting the motor and light unit to a power source. A control module includes a controller coupled to a first electronic switch to control power delivery to the motor based on a position of the switch unit, and to a second electronic switch to control power delivery to the light source based on a position of the switch unit. A timer is configured to keep the light unit illuminated for a predetermined amount of time after the switch unit has been activated or deactivated. The control module also includes a boot circuit with a semiconductor switch that continues to deliver power to the controller and to the light unit when the switch unit is deactivated subsequent to being activated, to enable the light unit to remain illuminated after the switch unit has been deactivated.

Abstract: There are provided a light source system which can suppress the deterioration of a luminescent material and a projector which can project a clear image. The light source system comprises a luminescent wheel, a driving unit for rotating the luminescent wheel, a light source for shining excitation light on to a luminescent material layer of the luminescent wheel, a light shining control unit for controlling an illumination timing of the light source, a light shining time integrating unit for integrating individual excitation light shining times to a plurality of predetermined divided areas of the luminescent wheel, an integrated light shining time storage unit for storing the individual light shining times to the predetermined divided areas, and a light shining range control unit for equalizing times over which excitation light is shone on to the plurality of predetermined divided areas of the luminescent wheel based on the individual excitation light shining times to the predetermined divided areas.

Abstract: A circuit for improving the control of a change in state of a signal in an electronic device between a first state and a second state, wherein a first change in state occurs when the state changes from the second state to the first state and a second change in state occurs when the state changes from the first state to the second state and wherein the first and second changes in state have associated therewith a first and a second time delay over which each change in state occurs, characterized in that said circuit comprises a determining unit for measuring the first time delay and a calculator for calculating a common delay to replace one or more of the first and second delays to thereby improve the control of the change in state of the signal.

Abstract: The present invention relates to the development of a method and system for manufacturing and deploying light emitting diode (“LED”) technology in a highly efficient manner. Devices of the invention include a printed circuit board with a heat sink and at least one LED insertion site and optionally a wireless communication device to control operation of the LED.

Abstract: A control method for a semiconductor light source may include operating the semiconductor light source with short, powerful pulses by an operating device; storing the characteristic light decrease of the semiconductor light source depending on the power introduced into the semiconductor light source in the operating device; and altering power introduced during the pulse in such a way that the emitted quantity of light of the semiconductor light source substantially remains constant over the pulse duration.

Abstract: A controller and a method for controlling lamp drivers such as e.g. LED drivers for lamps having a fast response behavior such as e.g. LED lamps are proposed. They enable to substantially reduce or prevent a visible luminance flicker at such lamps when dimming the lamps with a conventional dimmer such as e.g. a phase cut dimmer. This can be achieved by switching off the lamp driver prematurely in such a way that a time jitter of a dimmer switching does not influence an on-time of the lamp driver. No bulky or expensive filters or capacitors are needed. Thus, a space-switch saving and/or inexpensive construction is enabled.

Abstract: A starter unit (for example, an RF-enabled and replaceable starter unit) has an ability both to turn on and to turn off a fluorescent lamp. The starter unit detects whether a ballast in the circuit with the fluorescent lamp is of a first type (for example, an L-type ballast) or is of a second type (for example, a C-type ballast). If the determination is that the ballast is of the first type, then the starter unit turns off the lamp in a first way (for example, using C-type timing and then using L-type timing alternatingly). If the determination is that the ballast is of the second type, then the starter unit turns off the lamp in a second way (for example, using only C-type timing). The same starter unit design is usable both in single-lamp fixtures and in multi-lamp fixtures where a mix of ballast types may be used.

Abstract: A driver circuit has a Light Emitting Diode (LED) driver having an input and output. A switching device is coupled to an output of the LED driver. An edge detector is coupled to the LED driver. A timing device is coupled to the edge detector. A latch is coupled to the edge detector, the timing device and the switching device.

Abstract: A decorative light in the form of a candelabrum, chandelier, or sphere, the candelabrum and chandelier having a plurality of artificial flower blossoms, each with an LED. A control circuit is electronically connected to each LED and has electronic circuitry to cause each LED to illuminate at a preselected time each day, remain illuminated for a predetermined interval, and then extinguish.

Abstract: Devices (10) for driving loads (20) such as organic/inorganic light emitting diodes are provided with drivers (11) for driving the loads (20), with converters (12) for converting first parameter signals defining parameters of the loads (20) into second parameter signals each being defined by one bit per time interval, and with digital controllers (13) for controlling the drivers (11) in response to the second parameter signals. The converter (12) may comprise a comparator circuit (40) and a timer circuit (41) for comparing the first parameter signal with a reference signal and for generating the second parameter signal having a respective first or second value of two possible values in case of a respective first or second comparison result. The parameter may be a current flowing through or light emitted by at least a part of the load (20). The driver (11) may be a buck/boost/buck boost/fly back converter.

Abstract: Illuminated safety helmets are provided. The helmets include a shell having two or more lighted zones mounted therein, which are spaced from each other on the outer surface of the shell. One or more of the lighted zones can be selectively deactivated, allowing a wearer to control which zone or zones not to illuminate, as may be desirable in certain situations. Each zone, when activated, is illuminated in a variable fashion, such that the light illuminated from the zone changes within a brief period of time.

Abstract: According to one embodiment, a luminaire includes a lighting circuit configured to light a light source with a power supply from the outside, an accumulated-lighting-time storing section configured to store accumulated lighting time of the light source, and a control circuit configured to control the lighting circuit in a set mode. The control circuit sets, if a pattern for turning on and off the power supply from the outside is a predetermined initial illuminance correction setting pattern, a mode in an initial illuminance correction mode for performing initial illuminance correction corresponding to the accumulated lighting time of the light source. The control circuit sets, if the pattern for turning on and off the power supply from the outside is a predetermined normal setting pattern, the mode in a normal mode for not performing the initial illuminance correction.

Abstract: Solid state light sources are compatible with AC phase-cut dimmers. The light sources may have switching mode power supplies having primary and secondary sides that are in first and second circuit parts that are electrically isolated from one another. Information regarding a waveform of input electrical power is extracted in the first circuit part and passed to a controller in the second circuit part by way of a galvanic isolator. Additional isolated paths may be provided to provide bi-directional exchange of information between the first and second circuit parts and/or to provide for the exchange of additional information relevant to control. The signal path from the first side to the second side may have a low latency.

Abstract: A circuit for implementing a configurable light timer controlling a light is disclosed. The circuit comprises an input portion for receiving timing characterization data, the input portion having a slot adapted to receive a portable memory device storing the timing characterization data; a control circuit coupled to access a set of data of a plurality of sets of data of the timing characterization data; and a multiple setting selection actuator coupled to the control circuit, the multiple setting selection actuator enabling a selection of the set of data to be implemented by the control circuit. A method of implementing a configurable light timer is also disclosed.

Abstract: A circuit for enabling the use of timing characterization data in a configurable light timer is described. The circuit comprises a connector adapted to receive a portable memory device having timing characterization data; a control circuit coupled to receive the timing characterization data; and a switch coupled between a reference voltage and an output terminal of the configurable light timer, wherein the switch is controlled by the control circuit to disconnect the reference voltage from the output terminal according to the timing characterization data. A method of enabling the use of timing characterization data in a configurable light timer is also disclosed.

Abstract: An electronic ballast includes a ballast control circuit controlling an inverter circuit to supply a rectangular wave AC power to a high-pressure discharge lamp. The ballast control circuit includes a load voltage detection circuit adapted to detect load voltages of both positive and negative polarities applied to the lamp, a comparison and selection circuit adapted to compare the detected load voltages of the positive and negative polarities and select one of the positive and negative polarities, and a switching control circuit adapted to use the load voltage of the polarity selected by the comparison and selection circuit for controlling load current in one cycle after a period of detecting the load voltages of both the positive and negative polarities.

Abstract: A discharge lamp lighting apparatus comprises a discharge lamp and a power supply the discharge lamp can be switched between a steady power lighting mode, which drives the discharge lamp by an alternating current in which first and second polarities are repeated by turns, and a low power lighting mode, which drives the discharge lamp at 50% or less of the alternating current of the steady power lighting mode, and the alternating current comprises a first time unit, which has a time width t1, and second time unit, which has a time width t2, that are repeated by turns to drive the discharge lamp.

Abstract: A temperature measurement system is provided for a light emitting diode (LED) assembly that includes an LED having two semiconductors joined together at an LED junction. The system includes a temperature sensor operatively connected to the LED assembly at a remote location that is remote from the LED junction. The temperature sensor is configured to measure a temperature of the LED assembly at the remote location. A temperature calculation module is operatively connected to the temperature sensor for receiving the measured temperature at the remote location from the temperature sensor. The temperature calculation module is configured to determine a junction temperature at the LED junction based on the measured temperature a the remote location.

Abstract: A lighting unit includes a power supply, a light source, a controller, and an output intensity adjustment mechanism. The adjustment mechanism is configured to allow a user to set an output intensity of a plurality of non-zero intensities generatable by the light source. The controller is operable to control a supply of electrical power from the power supply to the light source such that the light source illuminates in accordance with the intensity set by the user. The lighting unit is also operable to optionally report usage information for the lighting unit (e.g., cumulative on time) using the light source to produce a visually undetectable information signal. The controller is further optionally operable to adjust (e.g., increase) the electrical power supplied to the light source when the cumulative on time for the light source corresponds to a point on a lumen depreciation curve indicating a reduction in light source intensity.

Abstract: A display device includes: a display panel; an optical detector which includes an optical sensor formed by a thin film transistor for detecting external light and a capacitor connected between a pair of electrodes of the optical sensor; a switch which turns on or off a charging operation of the capacitor; an optical sensor controller which controls the switch to be turned on or off and measures illumination of the external light on the basis of a time period during which the switch is turned off and a voltage of the capacitor becomes a value not more than a threshold value; and a controller which controls brightness of the display panel on the basis of an output of the optical sensor controller, wherein after the optical sensor controller detects a fact that the voltage of the capacitor becomes the value not more than the threshold value, the optical sensor controller turns on the switch after a predetermined time.

Abstract: A 1-wire communication protocol and interface circuitry for communication between a host controller and a LED driver is provided. The 1-wire communication protocol is configured such that both PWM signals and DC current setting commands for programming the LED driver may be transmitted from the host controller to the LED driver via the same 1-wire interface. The 1-wire communication protocol uses the length of the pulses (pulse width), rather than the number of pulses, to distinguish between different modes of communication (PWM signal transmission mode or command pulse transmission mode) and different commands of the same type (specific DC current programming commands, or specific average PWM drive current for the LED, within each transmission mode). Because the same 1-wire interface is used for transmitting both PWM signals and DC current commands, integrated circuits for the host controller and the LED driver do not require an additional wire or pin.

Abstract: Provided is a dimming device capable of emitting light from any area on a flat plane and which is minimized in crosstalk. The dimming device (1) according to the present invention includes: a light guiding plate (2); an LED (3) disposed on an edge of the light guiding plate (2); a switching section (4); a frame division section (5) that divides one frame period into a plurality of sub frame periods; a light source control section (6) that makes the LED (3) emit light every sub frame period; and a voltage application section (7). The switching section (4) includes scan electrodes (8) disposed in a direction parallel to a direction in which the LED (3) is disposed, a plurality of signal electrodes (10) disposed in a direction at right angles to the scan electrodes, and liquid crystal elements (9) with changeable light extraction rates from the light guiding plate (2).

Abstract: A glow-in-the-dark night light for a control device allows the control device to be easily found when the control device is located in a dark space. The night light may be provided on an actuator of the control device and may comprises a glow-in-the-dark material that has a luminance spectrum that decays with time after initial excitation. The night light is illuminated by an electromagnetic-energy-generating element to periodically recharge the glow-in-the-dark material with adequate energy to keep the glow-in-the-dark material visible in low ambient light conditions. The electromagnetic-energy-generating element draws relatively little current, such that the night light may be provided in a battery-powered remote control that has an acceptable battery lifetime.

Abstract: A light-emitting adjustment method and a display device are provided. The display device includes a voltage source, a light-emitting diode array, a pulse width modulator, a current sensor and a light-emitting adjuster. The voltage source provides an operating voltage. The pulse width modulator provides operating pulse signals to multiple light-emitting diodes arranged in column in order. The current sensor senses a plurality of overall current values of the light-emitting diodes at different timings during the light-emitting diodes are sequentially enabled. The light-emitting adjuster computes an operating current value of each of the light-emitting diodes according to the overall current values and performs a compensation operation based on the operating current value to obtain and output a compensation signal.

Abstract: A solar controller includes a microcontroller and a radio controlled clock receiving a time signal from a radio station and being synchronized to the time signal. The microcontroller is configured to store time-related data provided by the radio controlled clock.

Abstract: An example controller for a switched mode power supply includes a zero-crossing detector, drive logic, and an on-time extension block. The zero-crossing detector is coupled to generate a first signal prior to a zero-crossing of an input voltage of the power supply. The drive logic is to generate a drive logic output signal in response to a feedback signal, where the drive logic output signal is representative of an initial on-time. The on-time extension block is coupled to the zero-crossing detector and to the drive logic to generate a drive signal in response to the drive logic output signal. The drive signal controls switching of a switch to remove charge from a filter capacitor of the power supply. The drive signal is representative of a total on-time of the switch equal to a sum of the initial on-time and an extended on-time, where the extended on-time is responsive to the first signal.

Abstract: A dimmable light-emitting diode (LED) lamp and a dimmable LED lighting apparatus thereof are provided. The dimmable LED lamp includes a bridge rectifier, a toggle detector, a sustain voltage supply circuit, a counter, an LED light source, and an LED lighting driver. The bridge rectifier receives a source alternating current (AC) voltage through a wall switch and provides a rectified direct current (DC) voltage. The toggle detector monitors a toggle action of the wall switch. The sustain voltage supply circuit provides a sustain voltage. The counter receives the sustain voltage for operation. Moreover, the counter stores and provides an counting value that changes when the toggle detector detects the toggle action. The LED lighting driver converts the rectified DC voltage to a constant current to drive the LED light source. The LED lighting driver also provides multi-level dimming to the LED light source according to the counting value.

Abstract: An online time dimmer is disclosed, which comprises a base, an electric circuit unit lodged in the base and a top cover joined with the base correspondingly. The electric circuit unit is functionally made up of a dimmer circuit and a time circuit, and structurally comprises a power switch and a time switch, which are activated by a switch button and a time button respectively. When in use, one end of the unit connects electrically to a power supply through electric wires and a plug, while the other end to a lighting load through electric wires. Once depressing the switch button will in turn press the power switch, which activates power-on, power-off and the adjustment of brightness operated on the lighting load through the dimmer circuit. And depressing the time button will in turn press the time switch, which enables the time circuit to operate time setting on the lighting load.

Abstract: Embodiments of the present invention provide for the rapid reignition of a high intensity discharge lamp. In one embodiment of the invention, an apparatus for a fast reigntion of a high intensity discharge lamp is disclosed. The apparatus is comprised of a ballast operatively coupled to the lamp that is configured to receive power from a power supply. The apparatus is also comprised of a timer circuit that enters a timing phase and produces a quantum of timing information when the lamp ceases receiving power from the power supply. This timer circuit does not require external power during the timing phase. The apparatus is additionally comprised of a control circuit that receives the timing information and permits the ballast to reignite the lamp based on the information.

Abstract: A method includes receiving a control signal associated with a load, where the control signal is to cause a load change from a perspective of a switching-mode power supply. The method also includes causing the power supply to adjust a current through an inductor of the power supply in response to the control signal. The method further includes delaying delivery of the control signal in order to delay a time of the load change, where the current through the inductor increases during the delay. The control signal could include a request to turn on one or more LEDs. The load could include a current regulator. The method could further include providing the request to the current regulator after the delay, such as after the current through the inductor reaches a specified level. Voltage spikes and audible noise in a capacitor coupled to an output of the power supply can be minimized.

Abstract: A colored light generating element can be configured to, while in an active state, pulse between an off state and an on state. A substantially constant offset voltage or current can be applied to the colored light generating element during a predetermined time interval when the light generating element is in the off state so as to cause the colored light generating element to emit, during the off state, some amount of light greater than a minimum amount of light that the light generating element is capable of generating while part of an active system. In some implementations, two or more offset voltages or currents can be applied. Implementations may include a preprocessor configured to receive an image signal and optimize color saturation of the image signal, such as by limiting and non-linearly increasing color saturation. Implementations may include multiple colored light generating elements.

Abstract: A driving method of a light-emitting diode (LED) adapted to a driving apparatus is provided. The driving method includes receiving a dimming signal, detecting whether the driving apparatus performs dimming, and if the driving apparatus performs dimming, determining whether a duty cycle of the dimming signal is smaller than a predetermined value. When the duty cycle of the dimming signal is not smaller than the predetermined value, respective current magnitudes of a plurality of driving currents are regulated according to the dimming signal, and each of the driving currents is output for a full time of a period. Conversely, when the duty cycle of the dimming signal is smaller than the predetermined value, each of the driving currents is output for a partial time of a period. A driving apparatus employing the driving method is also provided.