Driving circuit and driving method for light emitting diode and display apparatus using the same
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorsXiang Yang, Fei Li
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Abstract
The present invention provides a driving circuit and a driving method for light-emitting diodes (LEDs), and a display apparatus using the same. The driving circuit comprises a power switch and a dimmer circuit. The method comprising: providing a pulse width modulation (PWM) dimming signal and a high frequency dimming signal; and multiplying the PWM dimming signal and the high frequency dimming signal for providing a driving signal to the power switch. The present invention can improve a dimming effect of the LEDs.
Claims10
A driving circuit for driving a plurality of light-emitting diodes (LEDs), comprising:
- a power switch connected to the light-emitting diodes;
- a resist connected to the power switch and electrically connected to ground;
- and
- a dimmer circuit connected to the power switch, wherein the dimmer circuit comprises a multiplier configured to multiply a pulse width modulation (PWM) dimming signal and a high frequency dimming signal, so as to provide a driving signal to the power switch, and the high frequency dimming signal is obtained by transforming an image signal of a display panel;
- wherein the power switch is a transistor, and a drain electrode of the power switch is connected to the LEDs, and a source electrode of the power switch is electrically connected to the resist, and a gate electrode of the power switch is connected to the dimmer circuit;
- wherein a frequency of the high frequency dimming signal is two times higher than a frequency of the PWM dimming signal.
A driving method for driving a plurality of light-emitting diodes, wherein the light-emitting diodes are electrically connected to a power switch, and the driving method comprises:
- providing a PWM dimming signal;
- providing a high frequency dimming signal, wherein the high frequency dimming signal is obtained by transforming an image signal of a display panel;
- and
- multiplying the PWM dimming signal and the high frequency dimming signal for providing a driving signal to the power switch;
- wherein the PWM dimming signal and the high frequency dimming signal are multiplied by a multiplier of a dimmer circuit;
- wherein the power switch is a transistor, and a drain electrode of the power switch is connected to the LEDs, and a source electrode of the power switch is electrically connected to a resist, and a gate electrode of the power switch is connected to the dimmer circuit;
- wherein a frequency of the high frequency dimming signal is two times higher than a frequency of the PWM dimming signal.
A display apparatus, comprising:
- a display panel;
- a timing controller;
- and
- a backlight module comprising:
- a back bezel;
- a plurality of light-emitting diodes disposed on the back bezel;
- and
- a driving circuit electrically connected to the light-emitting diodes for driving the light-emitting diodes, wherein the driving circuit comprises:
- a power switch connected to the light-emitting diodes;
- a resist connected to the power switch and electrically connected to ground;
- and
- a dimmer circuit connected to the power switch, wherein the dimmer circuit comprises a multiplier configured to multiply a PWM dimming signal and a high frequency dimming signal provided by the timing controller, so as to provide a driving signal to the power switch, and the high frequency dimming signal is obtained by transforming an image signal of a display panel;
- wherein the power switch is a transistor, and a drain electrode of the power switch is connected to the LEDs, and a source electrode of the power switch is electrically connected to the resist, and a gate electrode of the power switch is connected to the dimmer circuit;
- wherein a frequency of the high frequency dimming signal is two times higher than a frequency of the PWM dimming signal.
Dependencies are inferred from the claim text.