CPC G02F 1/133536 (2013.01) [G02F 1/133504 (2013.01); G02F 1/133553 (2013.01); G02F 1/1391 (2013.01)] | 16 Claims |
1. An electronic display that is diffuse reflective to visible light and non-diffuse retro-reflective to infrared light comprising:
a plurality of optical layers, the plurality of optical layers comprising:
a front polarizer for polarizing visible light incident on the electronic display and for polarizing infrared light incident on the electronic display;
a liquid crystal layer comprising a plurality of liquid crystals, wherein:
the liquid crystal layer introduces a plurality of retardation levels in the visible light; and
the liquid crystal layer introduces a plurality of retardation levels in the infrared light;
a transmissive diffuser layer, wherein:
the transmissive diffuser layer diffuses visible light having a first polarization and diffuses infrared light having the first polarization;
the transmissive diffuser layer does not substantially diffuse visible light having a second polarization and does not substantially diffuse infrared light having the second polarization; and
the second polarization is substantially orthogonal to the first polarization;
a reflective rear polarizer for transmitting the first polarization and reflecting the second polarization;
an absorption layer; wherein:
the absorption layer is transparent to infrared light; and
the absorption layer is opaque to visible light; and
a retroreflecting layer; wherein the retroreflecting layer reflects visible light and reflects infrared light.
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