Double color LED light-emitting diode detailed introduction

Dual-color LED light-emitting diode, is a LED light-emitting diode can emit two colors of light.

Usually, there are several types of dual-color LEDs as follows:

1, three feet dual-color LED. this light has three feet, the middle foot is common, the two sides of the foot a straight foot, a diagonal foot, respectively, corresponding to a color. To give an example of red and green two-color common sun. When the current flows from the middle foot to the straight foot, the red light works; when the current flows from the middle foot to the diagonal foot, the green light works; when the current flows from the middle foot to the straight foot and the diagonal foot at the same time, the red light and the green light work at the same time, mixing into yellow. The general circuit will choose this two-color LED red and green to indicate the circuit's two working states. A special point will also be to the third mixed color, but the consistency of this mixed color is more difficult to grasp.

2, four-legged dual-color. This two-color LED is the left two pins and the right two pins constitute two circuits, respectively, to drive two colors to indicate the working state of the two circuits.

3, two legs of two-color. This two-color LED is also called bi-directional LED. this two-color LED is very clever use of light-emitting diode voltammetric properties. Give an example of red and green bi-directional LEDs. This light has only two feet, a long foot, a short foot. Red LED's P pole, that is, the positive pole and the long foot welding, N pole, that is, the negative pole and the short foot welding; green LED's P pole and the short foot welding, N pole and the long foot welding; when the current flow from the long foot to the short foot, the red light works normally, the green light because the reverse does not conduct and does not work; when the current flows from the short foot to the long foot, the green light works normally, the red light does not work, so as to control the current flow to control the red and green The two colors.