CPC G02B 5/3033 (2013.01) [G02B 5/10 (2013.01); G02B 5/3041 (2013.01); G02B 5/3066 (2013.01); G02B 27/0172 (2013.01); G02B 2003/0093 (2013.01); G02B 2027/013 (2013.01)] | 1 Claim |
1. A device, comprising:
at least one optical film and having an active area that is curved in two orthogonal directions such that the active area has a total curvature, C, greater than 0.1, the active area having a minimum pass band edge, λEmin, a maximum pass band edge, λEmax, an average pass band edge, λave, wherein a variation in upper pass band edge, (λEmax−λEmin)/λEave, in the active area is less than ln[1+(12/π)C]/20.
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