Patent ID: 11874576
Assignee: REALD SPARK, LLC
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 25:
26. A display device according to claim 23, wherein the plural polar control retarders further include:
a passive retarder which has an optical axis perpendicular to the plane of the passive retarder, the passive retarder having a retardance for light of a wavelength of 550 nm in a range from −300 nm to −700 nm, preferably in a range from −350 nm to −600 nm and most preferably in a range from −400 nm to −500 nm; or
a pair of passive retarders which have optical axes in the plane of the pair of passive retarders that are crossed, each retarder of the pair of passive retarders having a retardance for light of a wavelength of 550 nm in a range from 300 nm to 800 nm, preferably in a range from 350 nm to 650 nm and most preferably in a range from 450 nm to 550 nm.