Flexible Display Bending Structure With Etch Stopper Protection
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Solution Overview
Problem
Display devices face issues with cracks and damage to the etch stopper in the bending area due to external forces during the etching process on the substrate.
Innovation Solution
Incorporation of an etch stopper and a bump pattern on the substrate to protect the display device from damage during etching, using materials with resistance to etchants and providing structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If etching is performed on the substrate in the bending area to reduce bezel area, then the display area can be maximized, but cracks in lines and damage to the etch stopper occur due to external forces
Solution Approach 1:
An etch stopper layer is formed on the substrate before the etching process to prevent damage to underlying structures. This preliminary protective action ensures that when etching is performed to maximize display area, the etch stopper absorbs external forces and prevents cracks in link lines, thus resolving the contradiction between maximizing display area and maintaining structural integrity
Solution Approach 2:
The etch stopper layer acts as a cushioning layer formed beforehand to absorb mechanical stress and external forces during the etching process. This beforehand cushioning prevents damage to the substrate and link lines, allowing the etching process to proceed safely to maximize the display area while maintaining reliability
Data Source
AI summary
A display device includes a first substrate including a display area and a non-display area having a bending area, a second substrate disposed apart from the first substrate in the display area, a sub-substrate disposed to face a lower portion of the first substrate while the bending area of the non-display area is disposed therebetween, an etch stopper disposed on the first substrate and the sub-substrate to overlap the bending area, a link line disposed on an upper portion of the etch stopper, and a bump pattern disposed on an upper portion of the link line.