Optical compensation films based on stretched polymer films
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United States of America Patent
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Apr 21, 2015
Grant Date -
Mar 12, 2009
app pub date -
Aug 22, 2008
filing date -
Mar 29, 2007
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Abstract
The present invention provides uniaxially stretched polymer films that have a refractive index profile suitable for use as negative A-plates or biaxial birefringent plates in a liquid crystal display (LCD) device. These wave plates can be used to compensate for the phase retardations existing in various modes of LCDs including TN (twisted nematic), VA (vertically aligned), IPS (in-plane switching), and OCB (optically compensated bend), and therefore improving the viewing quality of the displays.
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