| 摘要 |
A liquid crystal display comprising a four-layer holographic filter that projects up to 100 percent of incident white light while providing improved color purity. The four-layer holographic filter processes normal incidence collimated white light derived from a projector and focuses red, green, and blue components of the collimated white light into separate spatial locations of a liquid crystal layer. The four-layer holographic filter includes a large spectral bandwidth volume transmission grating layer that diffracts incident collimated white light off-axis, followed by an off-axis holographic color filter comprising three separate hologram layers that include an array of off-axis volume transmission hologram lenslets designed to diffract the respective blue, green and red components of the off-axis white light back on axis and focus them onto locations of blue, green and red pixels, respectively, of the liquid crystal display layer.
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