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The patent has three LC layers. Each one can be made either clear or a primary color (red in one, green in the other, blue in the third) by orienting the liquid crystal dyes perpendicular to the light path (colored) or parallel (clear). I take it that the dye molecules also mainly affect one axis of polarization when they are perpendicular to the light path, so using polarizers makes the color effect stronger.
So, two are clear on any given field and one is a primary (additive) color. This seems to be how the TV works, as the brochure talks about clear states and shows three colors. The brochure also makes the usual illustrator's /printer's mistake of showing the primary images as red and white instead of red and black, etc. This same mistake was made in early illustrations of how the trinoscope worked.
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