Optical film with increased gain at non-normal angles of incidence
First Claim
Patent Images
1. A polarizer, comprising:
- a polymeric continuous phase and a disperse phase disposed within said continuous phase,wherein said polarizer has a relative gain at 60°
that is at least equal to the relative gain of said polarizer at normal incidence.
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Abstract
An optical film is provided which exhibits increased gain at nonnormal angles of incidence and which comprises a disperse phase of polymeric particles disposed within a continuous birefringent matrix. The film is oriented, typically by stretching, in one or more directions. The size and shape of the disperse phase particles, the volume fraction of the disperse phase, the film thickness, and the amount of orientation are chosen to attain a desired degree of diffuse reflection and total transmission of electromagnetic radiation of a desired wavelength in the resulting film.
175 Citations
22 Claims
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1. A polarizer, comprising:
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a polymeric continuous phase and a disperse phase disposed within said continuous phase, wherein said polarizer has a relative gain at 60°
that is at least equal to the relative gain of said polarizer at normal incidence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A polarizer, comprising:
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a polymeric first phase; and a second phase, disposed within said first phase, said second phase being discontinuous along at least two of any three mutually perpendicular axes; wherein said polarizer has a maximum relative gain as a function of angle within the range of 30°
to 60°
. - View Dependent Claims (11, 12, 13, 14)
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15. A polarizer, comprising:
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a polymeric continuous phase; and a disperse phase, disposed within said continuous phase; wherein the average of the relative cain for said polarizer taken over the range of 30°
to 60°
is greater than the relative gain of said polarizer at normal incidence. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A polarizer, comprising:
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a birefringent polymeric continuous phase; and a disperse phase, disposed within said continuous phase; wherein said polarizer has a maximum relative gain as a function of angle within the range of 30°
to 60°
, and wherein said polarizer has a total diffuse reflectivity of at least about 30%.
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Specification