LED design concept.outdoor led digital sign board

　　The position of LED as a backlight source in portable products has become unshakable, even in the backlight of large-sized LCD, LED has begun to challenge the mainstream position of CCFL (Cold Cathode Fluorescent Lamp);

　　In the field of lighting, LED, as the most critical component of semiconductor lighting, has been sought after by the market due to its many advantages such as energy conservation, environmental protection, long lifespan, and maintenance free. The driver circuit is an important component of LED (Light Emitting Diode) products. Whether in the fields of lighting, backlight, or display board, the selection of driver circuit technology architecture should be matched with specific applications.

　　The principle of LED luminescence is to apply a forward voltage at both ends, causing the recombination of a few and many charge carriers in the semiconductor, releasing excess energy, and thus causing the emission of photons.

　　The main function of the LED driver circuit is to convert AC voltage into a constant current power supply, while matching the voltage and current of the LED according to the requirements of the LED device.

　　Dimming method

　　Traditional dimming method; PWM (Pulse Width Modulation) utilizes simple digital pulses to repeatedly switch on and off LED drivers. The system only needs to provide digital pulses with different widths and widths to easily change the output current and adjust the brightness of the LED.

　　Advantages; Capable of providing high-quality white light, simple application, and high efficiency;

　　Fatal drawbacks; It is prone to electromagnetic interference and sometimes even generates noise that can be heard by the human ear.

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