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...http://www.google.se/patents/US6088159?utm_source=gb-gplus-sharePatent US6088159 - Reflective polarizers having extended red band edge for controlled off axis color
