The reflective substantially liquid crystal display itself does not emit light, and is emitted into the LCD panel by the light source in the space where it is reflected by the reflector plate.
The reflection-transmission conversion method can be used as a reflection type when the light source is sufficient in the space, and uses the light source as the illumination when there is not enough light in the space.
The projection type utilizes the principle of similar movie playback. The projection optical system projects the image displayed by the liquid crystal display on the far-end screen.
Transmissive liquid crystal displays use the built-in light source completely as illumination.