Multi-layered compensation film using specified Tg material as a birefringent layer

A method of forming a compensator, comprising:

• coating or co-casting one or more second layers that include an amorphous polymer in a solvent onto one or more first layers that include a polymer;
• and stretching the first layers and second layers simultaneously,
• wherein the polymer of the one or more first layers has an out-of-plane birefringence (Δnth) not more negative than −0.005 and not more positive than +0.005;
• wherein the amorphous polymer of the one or more second layers has an out-of-plane birefringence more negative than −0.005 or more positive than +0.005;
• wherein the term “amorphous” means that the polymer does not show molecular order as measured by the absence of sharp peaks in the X-ray diffraction data;
• wherein the overall magnitude of the 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 either:
• (a) more negative than −20 nm, in which case the amorphous polymer of the one or more second layers contains in the backbone a non-visible chromophore group and has a glass transition temperature (Tg) such that 110° C.≦Tg≦180° C., or
• (b) more positive than +20 nm, in which case the amorphous polymer of the one or more second layers includes off the backbone a non-visible chromophore group and has a glass transition temperature (Tg) such that 110° C.≦Tg≦160° C.;
• and wherein at least one of the one or more polymeric first layers and at least one of the one or more polymeric second layers are contiguous.