Light emitting diode (LED) is a new type of solid-state light source. Born in the 1960s, in 1923, in the study of semiconductor SC, Rossen o, w studied the light emission in the impurity PN junction, and developed the light emitting diode (LED). With the rapid development of the electronic industry, in the 1960s, the display technology developed rapidly, and led gradually attracted people's attention.

LED light source has the following advantages:

1. Long service life (> 100000hrs)

2. Low driving voltage (18 ~ 4.5V)

3. Low power consumption (40 ~ 1000MW)

4. Relatively cold light source (Low radiation)

5. Fast lighting speed (Time constant is 10-7 ~ 10-9s)

6. Avoiding suspected lighting effect

7. Small size

8. Multiple colors

9. Excellent shock resistance (All solid state packaging, not easy to damage)

10. Good monochromatic (Stable emission wavelength)

11. Green pollution-free