Uniaxially oriented birefringent article having a structured surface
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United States of America Patent
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Issued Date -
Sep 14, 2006
app pub date -
Dec 23, 2004
filing date -
Dec 23, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An article, such as a film, comprising a body portion and a surface portion is provided. The body portion has (i) a first and a second surface, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axis in a thickness direction of the body. The surface portion comprises a linear geometric feature disposed on the first surface of the body in a direction substantially parallel to the first in-plane axis of the polymeric body. The article has (i) a first index of refraction (n.sub.1) along the first in-plane axis, (ii) a second index of refraction (n.sub.2) along the second in-plane axis, and (iii) a third index of refraction (n.sub.3) along the third axis, wherein n.sub.2 and n.sub.3 are substantially the same but substantially different from n.sub.1; and wherein the uniaxially oriented polymeric film has a relative birefringence of 0.3 or less and wherein the ratio of the thickness of the body to the height of the geometric feature is at least 2.
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