Chunghwa Picture Tubes, Ltd.

Chi-Hsiu Lin

Chien-Yang Chen

Shin-Chang Lin

Po-Kun Hsieh

Wei-Wen Chung

Yu-Ting Chien

Han-Yu Chao

Ming-Chang Lin

Chun-Chien Chiu

Chung-Lin Fu

Ming-Zhang Lin

Han-Lin Chao

Shih-Hen Chao

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.

Method of scanning backlight driving lamps for an LCD

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.

Light emitting diode driving device and method thereof

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.

Driving circuit and method of backlight module

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.

Backlight module control system whose two backlight sub-modules are in a closed loop

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.

Independent power supply module for LCD

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.

Method for driving a plasma display panel

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.

Driving method

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.

Light source driving module and circuit

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.

Driving circuit for LED backlight system

A method for recovering electric energy of a plasma display panel (PDP) by controlling two recovery units respectively connected to two sides of the PDP is introduced. The method includes forming series resonance loops within corresponding periods of a working period so that a capacitor of one of the two recovery units is charging twice, where it is charged once by the PDP and is also charged by another capacitor of the other one recovery unit; and controlling the two capacitors of the two recovery units to respectively charge the PDP within proper periods.

Method for reducing power consumption of plasma display panel

A driving circuit for reducing noise of a ceramic capacitor, that is capable of driving a plasma display unit, is provided. The circuit includes a circuit board, a first switch, a second switch, a first capacitor set, a second capacitor set, and a control switch. The first switch is located on the circuit board and coupled to the second switch at a connecting point and the connecting point is connecting to the plasma display. The first capacitor set is coupled to the first switch and provides a first driving voltage to turn on the first switch. The second capacitor set is coupled to the second switch and provides a second driving voltage to turn on the second switch. The control switch can control the first switch and the second switch to carry out a charged and discharged operation. Moreover, the first and second capacitor sets both include an even number of ceramic capacitors subsequently those are located in reverse.

Growing community of inventors

Yun-Lin Hsien, Taiwan

Chi-Hsiu Lin