Invention Grant
- Patent Title: Polarizing plate, image display apparatus, and method for improving bright-place contrast in image display apparatus
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Application No.: US14779413Application Date: 2013-12-26
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Publication No.: US09989688B2Publication Date: 2018-06-05
- Inventor: Takashi Kuroda
- Applicant: DAI NIPPON PRINTING CO., LTD.
- Applicant Address: JP Shinjuku-Ku
- Assignee: Dai Nippon Printing Co., Ltd.
- Current Assignee: Dai Nippon Printing Co., Ltd.
- Current Assignee Address: JP Shinjuku-Ku
- Agency: Burr & Brown, PLLC
- Priority: JP2013-074972 20130329
- International Application: PCT/JP2013/084907 WO 20131226
- International Announcement: WO2014/155887 WO 20141002
- Main IPC: G02B5/30
- IPC: G02B5/30 ; G02B27/28 ; G02F1/1335 ; G02F1/13363 ; H01L51/52 ; G02B1/14

Abstract:
There is provided a polarizing plate including: a polarizer; and a light transmissive film with a birefringent property in a plane, disposed on one surface of the polarizer, wherein the light transmissive film satisfies a relationship of the following expression (1): nx>N>ny (1) where a refractive index in a slow-axis direction which is a direction with a greatest refractive index in a plane of the light transmissive film is nx, a refractive index in a fast-axis direction which is a direction orthogonal to the slow-axis direction in the plane is ny, and an average refractive index of the light transmissive film is N; and wherein the polarizer and the light transmissive film are placed so that both fast-axis direction of the light transmissive film and absorption-axis direction of the polarizer are along a horizontal direction.
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