Flexible Display Auxiliary Support Layer Bending Control
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Solution Overview
Problem
Flexible display panels face challenges in starting to bend at a predetermined position due to their relatively small elastic modulus, leading to poor bending and reduced process yield.
Innovation Solution
A display module is designed with a flexible display panel, first and second back films, and an auxiliary support layer. The auxiliary support layer, with a higher elastic modulus than the back films, is positioned between them to provide support and ensure the flexible display panel bends at the intended position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flexible display panel is bent without auxiliary support, then the bending process is simple, but the panel cannot start bending at the predetermined position, causing poor bending quality and reduced process yield
Solution Approach 1:
The support structure is segmented into multiple independent elements: first support elements positioned at the first end of the bending portion, and second support elements positioned at the second end of the bending portion. This segmentation allows precise control of bending initiation at specific locations without requiring a complex continuous support structure along the entire bending path.
Solution Approach 2:
Support is provided locally at the two ends of the bending portion rather than uniformly across the entire panel. The first and second support elements are strategically positioned to create localized support zones that guide the bending initiation at predetermined positions, reducing overall structural complexity while achieving precise bending control.
2Adaptability or versatility
If the elastic modulus of the flexible display panel is kept low for flexibility, then the panel remains flexible, but it becomes difficult to start bending at a predetermined position without support
Solution Approach 1:
The first and second support elements act as intermediary structures between the flexible display panel and the bending tooling. These support elements temporarily reinforce the panel at specific locations during the bending process, enabling precise bending position control without permanently increasing the panel's elastic modulus or sacrificing its inherent flexibility.
Solution Approach 2:
The support elements are positioned in advance at the predetermined bending locations before the bending process begins. This preliminary positioning ensures that when bending force is applied, the panel will initiate bending at the correct positions, resolving the conflict between low elastic modulus and bending position control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents premature bending of the flexible display panel, ensuring it bends at the predetermined position and improving the process yield by maintaining the desired bending shape.
Implementation Method 1
an elastic modulus of the auxiliary support layer is greater than an elastic modulus of the first back film and greater than an elastic modulus of the second back film
Data Source
AI summary
A display module includes a flexible display panel including a display portion, a binding portion, and a bending portion; a first back film, a second back film fitted to the display portion and the binding portion, respectively, an auxiliary support layer located between the first and second back films, bonded with the back films through first and second adhesive layers, respectively, and provided with an elastic modulus greater than the first and second back films; orthographic projections of the back films are located in or overlaps with those of the display portion and the bind portion, respectively. Side edges of the first and second back films and the auxiliary support layer close to the bending portion are first, second and third side edges, respectively; a spacing between the third and first side edges and a spacing between the third and second side edges are 0-0.35 mm.