LG PB60G Service Manual page 62

3. DLP Projection TV
Optical Layout - Dichroic Mirror
Dichroic Mirror (Color Filter) Dichroic Mirror (Color Filter)
Color separation filters, sometimes referred to as Dichroic filters,
are used in optical systems where the incident light needs to be split
into two or more wavelength regions or colors with a high degree of into two or more wavelength regions or 'colors' with a high degree of
efficiency.
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