Title:
CIRCULARLY POLARIZING PLATE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/093476
Kind Code:
A1
Abstract:
The present invention relates to a polarizing plate (1) provided with a polarizer (2), a first phase difference layer (3), and a second phase difference layer (4), the in-plane phase difference value Re(λ) at wavelength λ [nm] of the first phase difference layer (3) satisfying the relationships Re(450) < Re(550) < Re(650) and 100 nm ≤ Re(550) ≤ 200 nm, the second phase difference layer (4) satisfying the relationship Nz > Nx ≥ Ny, where Nx is the refractive index in the in-plane slow-axis direction, Ny is the refractive index in the in-plane fast-axis direction, and Nz is the refractive index in the thickness direction, and the phase difference value Rth(λ) in the thickness direction at wavelength λ [nm] of the second phase difference layer (4) satisfying the expression -300 nm ≤ Rth(550) ≤ -20 nm, the slow axis direction of the first phase difference layer (3) being in a range of 40° to 50° or -50° to -40°, the counterclockwise direction being positive, from the absorption axis direction of the polarizer (2), and the bending direction of a display device being set in a range of -5° to 5° or 85° to 95° with respect to the absorption axis direction of the polarizer (2).
Inventors:
KAWAMURA SHINICHI (JP)
Application Number:
PCT/JP2018/041656
Publication Date:
May 16, 2019
Filing Date:
November 09, 2018
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
G02B5/30; G09F9/30; H01L27/32; H01L51/50; H05B33/02
Domestic Patent References:
| WO2016158300A1 | 2016-10-06 |
Foreign References:
| JP2017102443A | 2017-06-08 | |||
| JP2017502360A | 2017-01-19 | |||
| JP2008509433A | 2008-03-27 | |||
| JP2004258394A | 2004-09-16 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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