A dichroic beamsplitter is a colour separation element in an MD projector. A beam-splitting film is coated on the substrate glass, and when the white light source is irradiated on the dichroic beam-splitter, part of the wavelengths are reflected and part of the wavelengths are transmitted, and because the wavelengths are different, different colours of light are presented in the two directions. This principle of dichroic beamsplitting is used in projector optical engines. Using two dichroic beamsplitters, which are coated with two different beamsplitting films, white light is broken down into R, G and B primary colours. The principle of dichroic spectroscopy can also be used to make a combined prism, the three primary colours of light after the synthesis to form a colour image.

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