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Reliability and mechanical durability tests of flexible OLED with ALD coating
Author(s) -
Jimbo Yasuhiro,
Tamatsukuri Yuki,
Ito Minato,
Yokoyama Kohei,
Hirakata Yoshiharu,
Yamazaki Shunpei
Publication year - 2015
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1002/jsid.377
Subject(s) - materials science , durability , atomic layer deposition , coating , oled , composite material , bending , bend radius , pencil (optics) , layer (electronics) , optics , physics
To improve the reliability and mechanical durability of a flexible organic light‐emitting diode display, the entire flexible display is coated with an aluminum oxide film by atomic layer deposition (ALD). Because the step coverage of ALD is excellent, the AlO x film was deposited not only on the front and back surfaces but also on the side surfaces of the display. A high‐temperature and high‐humidity preservation test, repetitive bending tests, and a pencil hardness test were conducted on the flexible display with ALD‐AlO x coating. The display survived 500 h of a 65°C, 95% preservation test, endured a 100,000‐time repetitive bending test with a curvature radius of 4 mm, and was found to have a pencil hardness of 4H.