| http://www.w3.org/ns/prov#value | - lationships 100 nm???Rth1+1.9???Re???500 nm and Re<190 nm where nx, ny and nz are refractive indices of the at least one first phase plate in the direction of the slower axis, in the direction of a faster axis and in the direction of a thickness (d), respectively, the faster axis being in a plane including the slower axis and parallel to the liquid crystal layer and being orthogonal to the slower
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