Flexible Display Panel Edge Structure for Stress-Reduced Rolling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display panels face issues during storage and rolling due to sharp edges and sudden level differences causing stress concentration, leading to peeling of layers and potential rupture of cables when rolled onto a cylinder.
Innovation Solution
A misaligned design is implemented in the edges of the layers, forming an inclined plane structure with a buffer area to absorb stress, and the flexible circuit board is disposed along the tangent direction of the cylinder to prevent sharp angles, reducing the risk of peeling and rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the flexible display panel is rolled onto a cylinder for storage, then the panel can be compactly stored, but sharp edges and sudden level differences cause stress concentration leading to peeling of layers
Solution Approach 1:
The patent applies beforehand cushioning by introducing a buffer area with a gradual inclined plane structure at the edge of the bottom support layer. This buffer area absorbs stress during rolling operations before it reaches the display layers, preventing stress concentration that would cause peeling. The gradual slope design ensures stress is distributed over a larger area rather than concentrated at a sharp edge.
Solution Approach 2:
The patent segments the bottom support layer into distinct functional areas: an adhesive area for bonding and a buffer area with inclined plane structure for stress absorption. This segmentation allows each area to perform its specific function optimally - the adhesive area provides strong bonding while the buffer area protects against rolling-induced stress concentration.
2Device complexity
If the flat cables are disposed along the radius direction of the cylinder, then the connection is simplified, but sharp angle differences increase the possibility of cable rupture
Solution Approach 1:
The buffer area with inclined plane structure serves as beforehand cushioning for the cables as well. By providing a gradual transition zone, it prevents sharp angle differences that would concentrate stress on the cables disposed along the radius direction, thereby protecting cable integrity while maintaining the simplified radial arrangement.
3Device complexity
If the layers are aligned at the edge at the first circle during rolling, then the structure is simplified, but a sharp edge concentrates stress into a point causing peeling
Solution Approach 1:
The patent introduces asymmetry at the edge of the bottom support layer by creating a buffer area with a gradual inclined plane structure instead of a straight aligned edge. This asymmetric design causes the stress to be distributed along the inclined surface rather than concentrated at a single point, preventing peeling while maintaining relatively simple layer alignment.
Data Source
AI summary
A flexible display panel includes a bottom support layer, a backside protective film layer, a display layer and a frontside protective film layer. The bottom support layer includes an adhesive area and a buffer area. The adhesive area is located at an end of the bottom support layer. The buffer area is adjacent to the side of the adhesive area. The backside protective film layer is located on the bottom support layer. The display layer is located on the backside protective film layer. An interface of the adhesive area and the buffer area and an edge of the display layer are misaligned in a vertical direction. The frontside protective film layer is located on the display layer. A portion of the frontside protective film layer adheres to the backside protective film layer.