Multilayer optical compensator, liquid crystal display, and process
First Claim
1. A multilayer compensator comprising one or more polymeric first layers and one or more polymeric second layers, wherein:
- said first layers comprise a polymer having an out-of-plane (Δ
nth) birefringence not more negative than −
0.01 and not more positive than +0.01;
said second layers comprise an amorphous polymer having an out-of-plane birefringence more negative than −
0.01 or more positive than +0.01; and
the overall in-plane retardation (Rin) of said multilayer compensator is greater than 20 nm and the out-of-plane retardation (Rth ) of said multilayer compensator is more negative than −
20 nm or more positive than +20 nm, and wherein the in-plane retardation (Rin) of said one or more first layers is 30% or less of the overall in-plane retardation (Rin) of said multilayer compensator.
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Accused Products
Abstract
A multilayer compensator includes one or more polymeric first layers and one or more polymeric second layers. The first layers comprise a polymer having an out-of-plane (Δnth) birefringence not more negative than −0.01 and not more positive than +0.01. The second layers comprise an amorphous polymer having an out-of-plane birefringence more negative than −0.01 or more positive than +0.01. An overall in-plane retardation (Rin) of the multilayer compensator is greater than 20 nm and the out-of-plane retardation (Rth) of the multilayer compensator is more negative than −20 nm or more positive than +20 nm. The in-plane retardation (Rin) of the one or more first layers is 30% or less of the overall in-plane retardation (Rin) of the multilayer compensator.
36 Citations
53 Claims
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1. A multilayer compensator comprising one or more polymeric first layers and one or more polymeric second layers, wherein:
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said first layers comprise a polymer having an out-of-plane (Δ
nth) birefringence not more negative than −
0.01 and not more positive than +0.01;
said second layers comprise an amorphous polymer having an out-of-plane birefringence more negative than −
0.01 or more positive than +0.01; and
the overall in-plane retardation (Rin) of said multilayer compensator is greater than 20 nm and the out-of-plane retardation (Rth ) of said multilayer compensator is more negative than −
20 nm or more positive than +20 nm, and wherein the in-plane retardation (Rin) of said one or more first layers is 30% or less of the overall in-plane retardation (Rin) of said multilayer compensator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A process for forming a compensator for an LC display comprising coating or co-casting one or more second layers that contain an amorphous polymer in a solvent onto one or more first layers that contain a polymer, and stretching the first layers and second layers such that:
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said first layers comprise the polymer having an out-of-plane (Δ
nth) birefringence not more negative than −
0.01 and not more positive than +0.01;
said second layers comprise the amorphous polymer having an out-of-plane birefringence more negative than −
0.01 or more positive than +0.01; and
the overall in-plane retardation (Rin) of said multilayer compensator is greater than 20 nm and the out-of-plane retardation (Rth) of said multilayer compensator is more negative than −
20 nm or more positive than +20 nm, and wherein the in-plane retardation (Rin) of said one or more first layers is 30% or less of the overall in-plane retardation (Rin) of said multilayer compensator. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification