How to guide the elevator button light?

There are three main ways to guide the light of the elevator key light:

1, PCB board light guide: Light-emitting diode (LED) is welded on the PCB board, and the current is conducted to the LED through the conductive layer of the board, and then the light is guided to the keys through the light guide layer on the board.

2. Plastic light guide: put light guide materials, such as polycarbonate and polycarbonate, between the key and the LED, and guide the light emitted by the LED to the key through the refraction of the plastic material.

3. Glass light guide: a glass material is placed between the key and the LED, and the light emitted by the LED is guided to the key through the refraction of the glass material.