Flexible Display Module Border Narrowing Through Bubble-Controlled Layering
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Solution Overview
Problem
The challenge of achieving a narrower border design in flexible display modules is hindered by excessive overlap between the light shielding layer and the polarizer, leading to wider borders due to the formation of bubbles during the manufacturing process.
Innovation Solution
The solution involves controlling the thickness difference between the bending protection layer and the polarizer within a specific range (0≤d≤m, where m is proportional to the adhesive layer thickness) to minimize step differences, thereby reducing bubble formation and overlap, and incorporating a light shielding layer to block any remaining bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light shielding layer and polarizer are positioned to achieve narrow border design, then the border width is reduced, but bubbles form during manufacturing which worsens display quality
Solution Approach 1:
The patent applies preliminary action by pre-forming a cambered surface on the bending protection layer before final assembly. This pre-curved surface configuration allows the light shielding layer and polarizer to be positioned for narrow border design while the cambered geometry prevents bubble formation during manufacturing, thus resolving the contradiction between border width reduction and manufacturing precision.
Solution Approach 2:
The patent changes the geometric parameter of the bending protection layer from a flat surface to a cambered surface with specific curvature radius. This parameter change allows the layer to accommodate the positioning requirements for narrow border design while the curved geometry distributes stress and prevents bubble formation, simultaneously improving border width and manufacturing quality.
2Stability of the object's composition
If the thickness difference between bending protection layer and polarizer is large, then structural stability is improved, but step difference increases causing bubble formation
Solution Approach 1:
The patent applies local quality by creating a cambered surface with specific curvature radius on the bending protection layer. This local geometric modification allows the layer to maintain structural stability through its curved configuration while controlling the step difference at interfaces to prevent bubble formation, thus resolving the contradiction between stability and manufacturing precision.
3Strength
If the adhesive layer thickness is increased, then bonding strength is improved, but the maximum step difference filling capacity increases allowing larger bubbles
Solution Approach 1:
The patent applies preliminary action by pre-forming the cambered surface on the bending protection layer before assembly. This pre-curved configuration ensures that even with increased adhesive layer thickness for stronger bonding, the step difference is controlled to prevent bubble formation, thus resolving the contradiction between bonding strength and bubble size.
Data Source
AI summary
The present disclosure relates to a flexible display module, a method for manufacturing the flexible display module, and a display device. In the flexible display module, the polarizer is located on the light-emitting side of the first non-bending portion of the flexible display panel, and covers a display area and part of a non-display area; the bending protection layer and the polarizer are located on the same side of the flexible display panel, the bending protection layer covers the bending portion of the flexible display panel and is in contact with an edge of the polarizer; the adhesive layer is located on one side of the polarizer away from the flexible display panel and covers the polarizer and at least part of the bending protection layer; in the bending protection layer, the area in contact with the polarizer is the first area.