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Polarizing plate with optical compensation layer, method of producing the same, and liquid crystal panel, liquid crystal display, and image display including the same
   
Document Number
US Patent 7557883
Issued Date
July 7, 2009
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Abstract
A polarizing plate with optical compensation layers that performs a wide viewing angle compensation with respect to a liquid crystal cell, allows circularly polarized light to be obtained over a wide range of light wavelengths, contributes to the reduction in thickness, prevents thermal irregularity from occurring, and can effectively prevent light leakage from occurring in a black display. The polarizing plate includes a polarizer, a first optical compensation layer, and a second optical compensation layer that are stacked together in this order. The first optical compensation layer is formed of a liquid crystal compound and has a relationship of nx>ny=nz and an in-plane retardation Re.sub.1 of 100 to 170 nm. The second optical compensation layer has a relationship of nx=ny>nz and a thickness direction retardation Rth.sub.2 of 30 to 400 nm. The angle formed between the absorption axis of the polarizer and the slow axis of the first optical compensation layer is in the range of "plus" or "minus" 25 to 65 degrees.
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Number of Claims:
13
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Owner
Nitto Denko Corporation (Ibaraki-Shi,JP)
Published
July 7, 2009
Application Number
11/776,637
Filed
July 12, 2007
US Classification
349/119   349/117 349/118 349/187 349/96
Int'l Classification
G02F   1/1335   (20060101)   B29D   11/00   (20060101)   G02B   5/30   (20060101)  
Examiner
Assistant Examiner
Priority Data
Jul 12, 2006 [JP] 2006-191246
USPTO Field of Search
349/12   349/75   349/96   349/106   349/117   349/118   349/119   349/123   349/187   349/191   264/1.34   359/499  
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