Circular polarizer for organic EL display device having laminated half wavelength plate and quarter wavelength plate, and organic EL display device
US10634836B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2015 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Apr 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B33/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a λ/2 plate; and an elongated second retardation layer functioning as a λ/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15° to 30°; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.