The crease perception in flexible display

Abstract

There is a growing possibility applied to the foldable display for mobile devices because consumers want to see the big screen and they prefer mobile devices easy to carry around. However, a foldable display has crease because it generally uses laminated films or plastic substrates. In this study, we conducted the experiments in which people perceive crease on the flexible display for the various display viewing environments. The result shows that subjects most easily perceived crease in a bright room and panel off-state when the folding radius is 5 mm (5R). They perceived crease at an average height of 143 μm in that condition. The subjects perceived crease at an average height of 185.5 μm in the outdoor with display off condition. Also we analyzed that the subjects perceived the crease better when the folding radius of the flexible display was smaller than 5R. We expect that this study will contribute to the standardization of the new assessment method and to setting perception standards for the flexible display.

Physics of Liquid Crystals

“…In 1998, the two-dimensional model became mainstream when it was used in the fringe field switching (FFS) mode [72].…”

17‐4: Quantifying Surface Quality due to Periodic Linear Waviness of a Rollable Display

“…One crucial factor must be considered is visual surface quality of the display when it is reflected by a light source [4]. Plastic deformation of the display module components caused by rolledstate strain is responsible for the uneven reflection of the outside light and causes degradation of user's assessment of the surface quality.…”

P‐95: Comparative Effectiveness Study on Foldable Display Module Application of Thin Metal Sheet

“…Prior to being applied to a product, key issues must be taken into account to ensure that the etched patterned metal plate performs as expected e.g., metal plate (UFR) for rigidity enhancement and etched pattern (FR) for foldability of display panels. In the case of crease phenomenon, it is intuitively displayed on the screen, and users tend to perceive the crease more easily when the folding radius is smaller, so as figuring out the solution for crease phenomenon is inevitable [3]. The level of crease can be reduced by adding sheet of metal foil as additional layer at the bottom, as it has outstanding characteristic in recovery [4].…”