The front LED lamp bead presents a regular geometric shape, usually square or round. The front face is compact, so small that it is difficult for the naked eye to see the details, generally in the millimeter level or even smaller. This compact design is easy to integrate into various lamps. According to the purpose of the lamp bead, the luminous area will present different colors, such as warm white, cold white, red, green and other bright colors, providing a variety of choices for lighting and decoration. Widely used in signal indication, sign lamp, LCD backlight 3C products (computer, communication and consumer electronics), wearable and portable equipment, and medical care applications.