Title:
CIRCULARLY POLARIZING PLATE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2010/058633
Kind Code:
A1
Abstract:
Provided is a low-cost display device which reduces undesired reflection of not only incident outside light from the normal direction but also incident outside light from the oblique direction and has a high contrast ratio and excellent visibility even in a bright room environment. A circularly polarizing plate is provided with a polarizer and a λ/4 plate. The circularly polarizing plate is provided with an antireflective layer, the polarizer, a birefringent layer, and the λ/4 plate which are stacked in this order. The NZ coefficient of the birefringent layer satisfies NZ<0.1, the in-plane fast axis of the birefringent layer is orthogonal to the absorption axis of the polarizer, the NZ coefficient of the λ/4 plate satisfies NZ>0.9, and the in-plane slow axis of the λ/4 plate intersects with the absorption axis of the polarizer.
Inventors:
SAKAI Akira (())
坂井彰 (())
坂井彰 (())
Application Number:
JP2009/063887
Publication Date:
May 27, 2010
Filing Date:
August 05, 2009
Export Citation:
Assignee:
Sharp Kabushiki Kaisha (22-22, Nagaike-cho Abeno-ku, Osaka-sh, Osaka 22, 〒5458522, JP)
シャープ株式会社 (〒22 大阪府大阪市阿倍野区長池町２２番２２号 Osaka, 〒5458522, JP)
SAKAI Akira (())
シャープ株式会社 (〒22 大阪府大阪市阿倍野区長池町２２番２２号 Osaka, 〒5458522, JP)
SAKAI Akira (())
International Classes:
G02B5/30; G02B1/11; G02F1/1335; G02F1/13363
Attorney, Agent or Firm:
YASUTOMI & Associates (5-36, Miyahara 3-chome Yodogawa-ku, Osaka-sh, Osaka 03, 〒5320003, JP)