Optical film stack including retardation layer
Assignee3M Innovative Properties Company
InventorsSun-Yong Park, Song-Geun Lee, Matthew B. Johnson, Adam D. Haag
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Abstract
Optical film stacks are described. More particularly, optical film stacks including a half-wave retardation layer are described. Achromatic half-wave retardation layers, including achromatic half-wave layers formed from a quarter-wave and a three-quarters-wave retardation layer, are described. Film stacks including reflective polarizers tuned to reduce wavelength dispersion of the half-wave retardation layer are also described.
Claims4
An optical stack comprising at least one retardation layer disposed between, and bonded to, a reflective polarizer and an absorbing polarizer, the reflective polarizer configured to preferentially transmit light polarized along a transmission axis of the reflective polarizer and preferentially reflect light polarized along an orthogonal reflection axis of the reflective polarizer, the absorbing polarizer configured to preferentially transmit light polarized along a transmission axis of the absorbing polarizer and preferentially absorb light polarized along an orthogonal absorption axis of the absorbing polarizer, the retardation layer having a slow axis and configured to modulate a polarization of an incident light, the reflective polarizer reducing a wavelength-dispersion of the retardation layer.
Dependencies are inferred from the claim text.