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A perfect trichromatic light mixer can be constructed from an old or obsolete three-panel LCD projector. These projectors use dichroic mirrors to split the light into red, green, and blue beams. The beams are directed through three polysilicon LCDs, recombined by mirrors or a cube-prism, and superimposed on the screen to produce a full-color image.
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John Cockman (2002) studied this question.
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