Abstract: A light emitting device driver apparatus includes: an inductor; a power switch which switches the inductor to convert an input power to an output current for driving a light emitting device circuit; and a conversion control circuit. When a dimming signal exceeds a first dimming threshold, a reference current signal is generated according to the dimming signal, and a switch control signal controls the power switch according to a first PWM signal, such that the output current corresponds to the level of the dimming signal. When the dimming signal does not exceed the first dimming threshold, the reference current signal is clamped to a level corresponding to the first dimming threshold, and a second PWM signal is generated according to the dimming signal, wherein the second PWM signal enables the first PWM signal to generate the switch control signal to control the power switch.

Abstract: A light emitting device driver apparatus includes: an inductor; a power switch which switches the inductor to convert an input power to an output current for driving a light emitting device circuit; and a conversion control circuit. When a dimming signal exceeds a first dimming threshold, a reference current signal is generated according to the dimming signal, and a switch control signal controls the power switch according to a first PWM signal, such that the output current corresponds to the level of the dimming signal. When the dimming signal does not exceed the first dimming threshold, the reference current signal is clamped to a level corresponding to the first dimming threshold, and a second PWM signal is generated according to the dimming signal, wherein the second PWM signal enables the first PWM signal to generate the switch control signal to control the power switch.

Abstract: The present invention discloses a light emitting device power supply circuit, a light emitting device control circuit and an identifiable light emitting device circuit therefor, and an identification method thereof. The light emitting device control circuit includes an operation signal generation circuit and an identification circuit. The operation signal generation circuit determines whether the light emitting device control circuit operates in an identified mode or amiss mode according to an enable signal. In the identified mode, the light emitting device control circuit operates a power stage circuit to supply an output current to an identifiable light emitting device circuit. In the miss mode, an output voltage is maintained at a predetermined level. The identification circuit determines whether the light emitting device control circuit switches from the miss mode to the identified mode according to whether the output voltage meets a condition.

Abstract: The present invention discloses a light emitting device power supply circuit and a damping circuit therein and a driving method thereof. The light emitting device power supply circuit includes: a tri-electrode AC switch (TRIAC) dimming circuit, a rectifier circuit, a light emitting device driver circuit, and a damping circuit. The damping circuit includes: an impedance circuit, which is electrically connected between the rectifier circuit and the light emitting device driver circuit; a silicon control rectifier (SCR) circuit, which is connected to the impedance circuit in parallel; and a delay circuit, which is coupled to the SCR circuit, for turning ON the SCR circuit after a delay time period from when the TRIAC diming circuit begins to start-up, wherein the delay circuit does not directly receive a full scale of the input voltage.

Abstract: The present invention discloses a light emitting device power supply circuit, a light emitting device control circuit and an identifiable light emitting device circuit therefor, and an identification method thereof. The light emitting device control circuit includes an operation signal generation circuit and an identification circuit. The operation signal generation circuit determines whether the light emitting device control circuit operates in an identified mode or amiss mode according to an enable signal. In the identified mode, the light emitting device control circuit operates a power stage circuit to supply an output current to an identifiable light emitting device circuit. In the miss mode, an output voltage is maintained at a predetermined level. The identification circuit determines whether the light emitting device control circuit switches from the miss mode to the identified mode according to whether the output voltage meets a condition.

Abstract: A control signal is provided for turning on and turning off a lamp of a backlight source. For a first duration when the liquid crystal is rotating, adjust a frequency of the control signal to turn on and turn off the lamp of the backlight source consecutively or adjust a duty cycle of the control signal to turn off and then turn on the lamp of the backlight source. Thus, the backlight source has a luminance value for the first duration, and the control signal turns on the lamp of the backlight source for a second duration when the liquid crystal is in the steady state.

Abstract: A light emitting diode (LED) driving device and an LED driving method thereof are provided. The LED driving device includes a voltage generator, a circuit and a compensation circuit. The voltage generator is used to provide a positive voltage and a negative voltage, and the circuit is coupled to the positive voltage and the negative voltage. Herein, the circuit includes a load and an LED which are coupled to each other in series. The compensation circuit is used to sense voltages of two ends of the load, so as to generate a compensation signal and adjust the positive voltage and the negative voltage through the compensation signal. Therefore, voltage stress of the LED driving device is reduced by using the provided positive voltage and the provided negative voltage.

Abstract: A driving circuit includes a signal generator, a resonant circuit, a control circuit and an adjusting circuit. The signal generator is utilized for generating an alternating current (AC) signal having a fixed frequency. The resonant circuit is coupled to the signal generator, and is utilized for generating an oscillation signal to drive a backlight source according to the alternating current signal. The control circuit is utilized for providing a control signal. The adjusting circuit is coupled to the control circuit, the resonant circuit and the backlight source, and is utilized for providing an impedance according to the control signal to thereby adjust a current value of the backlight source.

Abstract: A backlight module control system includes a power supply, a first backlight sub-module, a second backlight sub-module, a first transformer and a second transformer. The power supply is utilized for providing an operating power to the backlight module control system. A primary side and a secondary side of the first transformer are respectively coupled to the power supply and a first node of the first backlight sub-module. A primary side of the second transformer is coupled to the power supply, and a secondary side of the second transformer is coupled to the secondary side of the second transformer and a first node of the second backlight sub-module.

Abstract: A power supply module for an LCD includes a system power supply module and a backlight power supply module. The system power supply module is used to drive a display panel module of the LCD. The backlight power supply module utilizes a power factor correction device to convert an input AC voltage to a DC voltage, and then utilizes a DC/AC inverter to convert the DC voltage to an AC driving voltage to drive the backlight module. The power supply module is also applicable to a plurality of LCDs.

Abstract: A light emitting diode (LED) driving device and an LED driving method thereof are provided. The LED driving device includes a voltage generator, a circuit and a compensation circuit. The voltage generator is used to provide a positive voltage and a negative voltage, and the circuit is coupled to the positive voltage and the negative voltage. Herein, the circuit includes a load and an LED which are coupled to each other in series. The compensation circuit is used to sense voltages of two ends of the load, so as to generate a compensation signal and adjust the positive voltage and the negative voltage through the compensation signal. Therefore, voltage stress of the LED driving device is reduced by using the provided positive voltage and the provided negative voltage.

Abstract: An LCD includes a display panel, a plurality of fluorescent lamps, an electric field sensor, and an inverter. The electric field sensor senses electric fields of the plurality of fluorescent lamps to generate a voltage. The inverter is electrically connected the plurality of fluorescent lamps, and generates a driving voltage to drive the plurality of fluorescent lamps. The inverter adjusts an operating frequency of the driving voltage according to the voltage. Thus, the waving phenomenon of the LCD is improved effectively.

Abstract: A power supply module for an LCD includes a system power supply module and a backlight power supply module. The system power supply module is used to drive a display panel module of the LCD. The backlight power supply module utilizes a power factor correction device to convert an input AC voltage to a DC voltage, and then utilizes a DC/AC inverter to convert the DC voltage to an AC driving voltage to drive the backlight module. The power supply module is also applicable to a plurality of LCDs.

Abstract: A backlight module includes a fluorescent lamp, an LED module, a controller, a lamp inverter, and an LED driver. The controller generates a first control signal and a second control signal according to a display signal. The lamp inverter drives the fluorescent lamp according to the first control signal. The LED driver drives the LED module according to the second control signal. The LED module is installed close to the fluorescent lamp for compensating the luminance of the fluorescent lamp when turning on and turning off.

Abstract: A control signal is provided for turning on and turning off a lamp of a backlight source. For a first duration when the liquid crystal is rotating, adjust a frequency of the control signal to turn on and turn off the lamp of the backlight source consecutively or adjust a duty cycle of the control signal to turn off and then turn on the lamp of the backlight source. Thus, the backlight source has a luminance value for the first duration, and the control signal turns on the lamp of the backlight source for a second duration when the liquid crystal is in the steady state.

Abstract: A driving circuit of a plasma display panel (PDP) and a reset circuit thereof are disclosed. The above-mentioned driving circuit includes a reset circuit and a sustaining circuit. The reset circuit is connected to a display cell of the PDP and generates a reset signal for the above-mentioned display cell by means of an LC resonance. The sustaining circuit provides a sustaining voltage to the above-described display cell during the sustaining period of the display cell.

Abstract: The present invention provides a driving method suitable for a plasma display. The plasma display includes multiple scan electrodes, multiple sustain electrodes and multiple address electrodes, for example. Successive frames are adapted to be displayed in repeating reset periods, address periods and sustain periods by applying driving signals to the scan electrodes, sustain electrodes and address electrodes. The driving method is characterized in that before inputting driving signals or when interrupting driving signals, a wall-charge removing signal is applied to the scan electrodes to remove/reduce the residual wall charges around the scan electrodes and the sustain electrodes. As a result, the possibility of the plasma display generating erroneously discharging with strong light at the restarting state can be effectively reduced.

Abstract: A light source driving circuit includes a voltage signal source and a temperature-improving current source for adjusting luminance of a series of LEDs. A first end of the series of LEDs is electrically connected to a ground end. The temperature-improving current source includes an adjustable power supply for outputting an adjustable voltage, a voltage-controlled current source for outputting currents according to the voltage signal source, and a feedback circuit electrically connected between a second end of the series of the LEDs and the adjustable power supply for controlling the output voltage of the adjustable power supply according to the voltage on the second end of the series of LEDs.

Abstract: A driving circuit for an LED backlight system is disclosed. The driving circuit includes an input voltage, an input resistor, an operational amplifier, a first transistor and a current calculation unit. The operational amplifier has a positive input terminal electrically connected to the input voltage through the input resistor, and an output terminal electrically connected to its negative input terminal thorough a feedback network. The first transistor is utilized for draining a reference current to control an output voltage of the operational amplifier according to the input voltage and the input resistor. The current calculation unit is utilized for generating a plurality of working currents proportional to the reference current to drive a plurality of LED strings according to the output voltage of the operational amplifier.

Abstract: A backlight module control system includes a power supply, a first backlight sub-module, a second backlight sub-module, a first transformer and a second transformer. The power supply is utilized for providing an operating power to the backlight module control system. A primary side and a secondary side of the first transformer are respectively coupled to the power supply and a first node of the first backlight sub-module. A primary side of the second transformer is coupled to the power supply, and a secondary side of the second transformer is coupled to the secondary side of the second transformer and a first node of the second backlight sub-module.