Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Patent
1996-07-31
1998-09-15
Willis, Davis L.
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
359495, 359502, 349 97, G02B 530, G02B 2728, G02F 11335
Patent
active
058087940
ABSTRACT:
Reflective polarizers, which transmit one polarization and reflect the other polarization, have an extended red band edge in the off-axis transmission spectrum to control off axis color (OAC) hue. To control the OAC hue, the red band edge of the off-axis transmission spectrum, or OAC spectrum, is shifted beyond the boundary for red light, or to at least 600 nm. Even more preferably, the OAC spectrum is extended further into the red than any red emission peak of an associated lamp providing light into a system in which the reflective polarizer is used. The concept applies equally well to any type of reflective polarizer, such as multilayer reflective polarizers, cholesteric reflective polarizers, and the like. The resulting reflective polarizers are very useful for many different applications, such as liquid crystal displays.
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Cull Brian D.
Hoffman Kevin M.
Ouderkirk Andrew J.
Weber Michael F.
Fortkort John A.
Robinson Mark A.
Willis Davis L.
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