(54) MULTI-LAYER COMPENSATION FILM INCLUDING STRETCHABLE BARRIER LAYERS
(75) Inventors: James F. Elman, Fairport, NY (US);
Jon A. Hammerschmidt, Rochester,
(73) Assignee: Eastman Kodak Company, Rochester, NY (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 11/159,736
(22) Filed: Jun. 23, 2005
(65) Prior Publication Data
US 2005/0237457 Al Oct. 27, 2005
Related U.S. Application Data
(63) Continuation-in-part of application No. 10/745,109, filed on Dec. 23, 2003, now Pat. No. 6,995,395.
(51) Int. CI.
H01L 29/04 (2006.01)
(52) U.S. CI 257/59; 257/72; 349/119;
(58) Field of Classification Search 257/59,
257/72; 438/30; 428/412,1.3-1.33; 349/119,
See application file for complete search history. (56) References Cited
U.S. PATENT DOCUMENTS
A multilayer compensator has two or more first layers and one or more second layers. The overall in-plane retardation of the compensator is from 0 to 300 nm and the out-of-plane retardation is more negative than -20 nm or more positive than +20 nm. The compensator may be fabricated by: coating at least one barrier layer on at least one first layer; coating at least one second layer from an organic coating solvent on the barrier layer to produce an intermediate compensator structure; and stretching the intermediate compensator structure in at least one direction by between 1% and 60%. The barrier layer contains a polymer that is water soluble or water dispersible in an amount sufficient to impede the diffusion of the organic solvent between the other first layers and the second layers. All layers have been stretched simultaneously.
36 Claims, 2 Drawing Sheets