Abstract
Structural optimization has always been the main solution for increasing the stability of flexible screens. The bending method used to test a flexible display screen is an important factor in assessing the functionality and practicability of the electronic device. The bending mode of the display screen impacts the screen service life. In this study, 2D simulation models with different bending radii, bending directions, and bending times were constructed in ABAQUS and compared to determine the effects on the flexible screen from changing the stress value, the location of the stress concentration area and the deformation state of the screen under U- and water-drop-shaped bending. The simulation results show that U-shaped bending severely strains the junction between the bent and unbent areas of a model, whereas water-drop-shaped bending can avoid such problems. In addition, the results of multiple bending experiments were used to determine an appropriate reserved length of r=2.1~2.4 mm for a model under water-drop-shaped bending.
Highlights
Innovation is important for improving the economic efficiency and portability of display device products
Excellent energy consumption performance, display quality and cycle time has resulted in increasingly wide use of Active matrix organic light-emitting diode (AMOLED) in flexible displays, smart wear and other fields[1,2,3]
Compared with a passive OLED, an AMOLED has a higher refresh rate and significantly lower energy consumption and is more suitable for portable electronic devices, which are sensitive to power consumption
Summary
Innovation is important for improving the economic efficiency and portability of display device products. The structural stability and cycle life of the AMOLED flexible screen have become important metrics of meeting considerations of portability and economy. The neutral layer area is an important consideration for an AMOLED flexible screen, along with the components of the functional layer, including the protective cover, polarizer, touch screen, OLED and back plate film. Increasing the number of neutral layers and changing the layer thickness can deflect the maximum force on the screen away from the functional layer and is an important means of optimizing the structure of the flexible screen[10,11]. Using water droplets for bending changes the curve bending trajectory and leaves an unbent area, which helps avoid screen creasing This novel bending method can extend screen service life and facilitates the design of non-crease flexible display screens. Not just the maximum stress which is normally used, the recovery degree of the panel group has been an important factor to measure the bending situation in this article and make the results of simulation more reliable
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