CPC G02B 5/3083 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0118 (2013.01)] | 2 Claims |
1. An optical system for displaying an object to a viewer comprising:
one or more optical lenses having at least one curved major surface;
a reflective polarizer disposed on and conforming to a first major surface of the one or more optical lenses, the reflective polarizer substantially reflecting light having a first polarization state and substantially transmitting light having an orthogonal polarization state at a predetermined wavelength in a range from about 400 nm to about 1000 nm;
a partial reflector disposed on and conforming to a different second major surface of the one or more optical lenses, the partial reflector having an average optical reflectance of at least 30% at the predetermined wavelength, the partial reflector and the reflective polarizer defining a folded optical cavity therebetween;
a first retarder layer disposed inside the folded optical cavity and having a substantially uniform retardance at the predetermined wavelength;
a second retarder layer disposed outside the folded optical cavity and having a substantially uniform retardance at the predetermined wavelength; and
a third retarder layer disposed outside the folded optical cavity and having a substantially non-uniform retardance at the predetermined wavelength,
such that when an image light ray emitted from a display at the predetermined wavelength is first incident on the reflective polarizer, the image light ray is substantially reflected with a first reflectance (ρ), and when the image light ray is second incident on the reflective polarizer, the image light ray is substantially transmitted with a first transmittance (τ), the third retarder layer increasing the first reflectance.
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