Display with polarization dependent diffusive properties
AssigneeNew Vision Display, Inc.
InventorsGuy P. Bryan-Brown, Richard M. Amos, Emma L. Graham, Matthias T. Pfeiffer
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Abstract
Systems, apparatuses, and methods for an electronic display are disclosed. More specifically, the invention and disclosure relates to an electronic display that has a diffuse, paper-like reflectance characteristic for visible light, while being retroreflective and non-diffuse for infrared light, for easy image detection and analysis with infrared cameras, while preserving viewing properties of an electronic paper display for humans.
Claims16
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.
Dependencies are inferred from the claim text.