Display Panel Terminal Region Warpage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As flexible display technology advances, larger product sizes lead to increased warpage and risk of metal trace breakage in terminal regions during bending processes.
Innovation Solution
A display panel design featuring a reinforcement layer and protective layers in the terminal region, with a specific layer structure and spacing to reduce warpage and protect metal traces, including a first protective layer, a second protective layer connected to the reinforcement layer, and a circuit board arrangement to enhance stiffness and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the terminal region is increased to accommodate larger product sizes, then the display panel can support larger products, but the edge of the terminal region becomes more prone to warpage and metal trace breakage during bending
Solution Approach 1:
The terminal region is segmented into multiple functional layers: a first protective layer covering the metal trace, a reinforcement layer providing structural support, and a second protective layer connected to the reinforcement layer. This segmentation allows each layer to perform its specific function in preventing warpage and trace breakage while accommodating the overall larger terminal region size.
Solution Approach 2:
The solution employs a composite structure combining multiple materials with different properties: the flexible substrate, the first protective layer (with lower elastic modulus for flexibility), the reinforcement layer (with higher elastic modulus for stiffness), and the second protective layer. This composite material approach allows the terminal region to maintain both large area and high reliability during bending.
2Area of stationary object
If the terminal region is made larger, then product size requirements are met, but the stiffness of the terminal region decreases making it more susceptible to warpage
Solution Approach 1:
The reinforcement layer is strategically positioned in the terminal region where additional stiffness is needed to prevent warpage during bending. The first protective layer is specifically placed where metal traces are located to provide localized support. This local quality enhancement allows the overall terminal region to maintain adequate stiffness despite its large area.
3Reliability
If protective layers are added to prevent warpage and trace breakage, then reliability improves, but the device structure becomes more complex
Solution Approach 1:
The first protective layer serves multiple functions: it protects the metal trace from mechanical damage, provides a barrier layer, and contributes to the overall structural integrity during bending. The second protective layer similarly provides protection while being connected to the reinforcement layer for additional support. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The first protective layer and the second protective layer are merged with the reinforcement layer to form an integrated protective structure. The second protective layer is directly connected to the reinforcement layer, creating a unified system that provides both protection and structural support in a combined configuration rather than separate elements.
Data Source
AI summary
The present disclosure provides a display panel. In the display panel, a first backplate is disposed in a terminal region; a flexible substrate including a first portion is disposed in the terminal region, wherein the first portion is disposed on the first backplate; a portion of a reinforcement layer is disposed on the flexible substrate and located in the terminal region; a first protective layer is disposed on the first portion, wherein the first protective layer and the reinforcement layer are disposed separately; and a second protective layer is disposed on the first protective layer and is connected to the reinforcement layer.