Reliability and mechanical durability tests of flexible OLED with ALD coating

摘要

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℃, 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.