摘要:
A backlight module control system includes at least one backlight module, a driving circuit, at least one switch and a power supply module. The driving circuit is utilized for determining a driving signal to drive the backlight module. The switch is coupled between the driving circuit and the backlight module, and is selectively turned on or off according to the driving signal. The power supply module is coupled to the backlight module, and is utilized for providing an operating voltage required by the backlight module control system.
摘要:
A light source driving circuit includes a power supply circuit, a first dimming circuit, and a control circuit. The power supply circuit has a control terminal and an output terminal that is connected to a terminal of a first light-emitting element. The first dimming circuit has a first terminal connected to the other terminal of the first light-emitting element, a second terminal connected to a common potential, and a pulse width signal input terminal. The control circuit is connected between the pulse width input terminal of the first dimming circuit and the control terminal of the power supply circuit. The first dimming circuit determines an ON/OFF state according to a logic state of the pulse width signal. The power supply circuit determines whether or not to output the voltage. The control circuit delays the power supply circuit, turns off the power supply circuit, and delays the first dimming circuit.
摘要:
A current-controlling apparatus is suitable for controlling the current passing through a light emitting device string (LEDS), wherein an end of the LEDS is electrically connected to a first-voltage level. The current-controlling apparatus includes a current-adjusting unit and a control unit. The current-adjusting unit, electrically connected between a second-voltage level and another end of the LEDS, is used for detecting a current of the LEDS, producing a feedback signal hereby and controlling the impedance between the LEDS and the second voltage level according to a conductance-controlling signal and an impedance-controlling signal to control the current. The control unit is electrically connected to the current-adjusting unit for receiving a reference signal and the feedback signal, comparing the feedback signal with the reference signal to give a comparison result, performing a current compensation on the comparison result and converting the compensated comparison result into the conductance-controlling signal and the impedance-controlling signal.
摘要:
A light source driving circuit for driving a light-emitting element is provided. The light source driving circuit includes a power supply circuit, a dimming circuit, and a feedback circuit. A first terminal of the dimming circuit is connected to a terminal of the light-emitting element, and a second terminal of the dimming circuit receives a supply voltage output from the power supply circuit. The dimming circuit determines an ON/OFF state between the first terminal and the second terminal according to a logic state of a pulse width signal. The feedback circuit is connected between the first terminal of the dimming circuit and a feedback terminal of the power supply circuit. The feedback circuit controls a level of the supply voltage output from the power supply circuit according to the ON/OFF state of the dimming circuit.
摘要:
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.
摘要:
A back light module is provided. The back light module includes a plurality of light source matrixes, a current adjusting circuit and a light source driving circuit, wherein each of the light source matrixes includes N light emitting units and N is an integer greater than 1. First ends of the light emitting units are electrically connected to each other, and a second end of the ith light emitting unit is electrically connected to an ith level switch line, wherein i is an integer and 1≦i≦N. The current adjusting circuit supplies and controls the current of each of the light source matrixes through level switch lines. The light source driving circuit drives the light source matrixes sequentially.
摘要:
A light emitting diode (LED) back light system and a method for driving a back light source used therein are provided. The LED back light system includes an LED back light source, a power converting circuit, and a sequential outputting circuit. The LED back light source includes a plurality of areas. The power converting circuit is used to convert an external power source into a driving power source. The sequential outputting circuit is electrically connected to the power converting circuit and said areas so as to generate a plurality of driving signals according to the driving power source. In addition, said driving signals are sequentially outputted to drive said areas at different time.
摘要:
A light source driving circuit is adapted for driving a light-emitted component. The light source driving circuit includes a power supply, a dimming circuit, and a feedback circuit. An output terminal of the power supply is coupled to one terminal of the light-emitted component to supply a power to the light-emitted component, and determine the power value according to a feedback signal received by a feedback terminal of the power supply. A first terminal of the dimming circuit is coupled to another terminal of the light-emitted component. A second terminal of the dimming circuit is coupled to a common voltage. According to a logic state of a pulse width signal, the dimming circuit determines the conduction of the first terminal and the second terminal. The feedback circuit is coupled between the first terminal and the feedback terminal, and determines the feedback signal according to on/off state of the dimming circuit.
摘要:
A method and apparatus for driving a plasma display panel and improving the display characteristics through multi-discharge phenomenon is provided. The driving method is used for providing energy to light up at least a display unit in the plasma display panel and includes the following steps. Before providing any external energy, an energy recovery circuit provides internally stored energy so that the display unit has a first discharge through a resonance effect initiated by the internally stored energy. After the first discharge, external energy is provided to the display unit to trigger a second discharge. Thereafter, the energy recovery circuit stops providing internally stored energy to the display unit. Similarly, external energy to the display unit is also stopped. After the second discharge, the energy in the display unit is returned to the energy recovery circuit to serve as internally stored energy.
摘要:
A backlight module control system includes at least one backlight module, a driving circuit, at least one switch and a power supply module. The driving circuit is utilized for determining a driving signal to drive the backlight module. The switch is coupled between the driving circuit and the backlight module, and is selectively turned on or off according to the driving signal. The power supply module is coupled to the backlight module, and is utilized for providing an operating voltage required by the backlight module control system.