Reflective polarizers having extended red band edge for controlled off axis color
First Claim
1. A reflective polarizer which transmits light of one polarization and reflects light of another polarization, the reflective polarizer having an OFF AXIS COLOR (OAC) red band edge of at least 600 nm for light having a 45 degree angle of incidence, and having an average transmission from 400-800 nm of less than about 12% for light polarized parallel to an extinction axis at the reflective polarizer at normal incidence.
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Accused Products
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.
287 Citations
20 Claims
- 1. A reflective polarizer which transmits light of one polarization and reflects light of another polarization, the reflective polarizer having an OFF AXIS COLOR (OAC) red band edge of at least 600 nm for light having a 45 degree angle of incidence, and having an average transmission from 400-800 nm of less than about 12% for light polarized parallel to an extinction axis at the reflective polarizer at normal incidence.
Specification