Foldable Display Window Module Edge Alignment for Defect Inspection
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Solution Overview
Problem
Current display devices lack effective methods for inspecting defects in window modules, particularly in foldable displays where the thin glass substrate and bezel pattern alignment pose challenges in defect detection and damage prevention during handling.
Innovation Solution
A foldable display device design featuring a window module with a thin glass substrate, a window protective layer, and a bezel pattern where the edge of the thin glass substrate is positioned between the edge of the plastic film and the outer edge of the bezel pattern, allowing for inspection of defects and minimizing damage during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thin glass substrate edge is aligned with the bezel pattern outer edge, then the manufacturing precision is improved, but the defect inspection capability deteriorates
Solution Approach 1:
The patent introduces a plastic film as an intermediary layer between the thin glass substrate and the bezel pattern. The plastic film extends beyond the substrate edge, creating a visible intermediate region that facilitates defect detection while maintaining precise alignment during manufacturing. This intermediary structure allows inspectors to detect defects at the substrate edge without requiring direct exposure of the substrate edge beyond the bezel pattern.
2Difficulty of detecting and measuring
If the thin glass substrate edge is exposed beyond the bezel pattern, then the defect inspection capability is improved, but the susceptibility to damage during handling increases
Solution Approach 1:
The patent applies beforehand cushioning by extending the plastic film beyond the thin glass substrate edge. This creates a protective cushioning layer that prevents direct exposure of the fragile substrate edge to external forces during handling and assembly. The plastic film absorbs mechanical stresses and protects the substrate from chipping or breaking, while still allowing optical inspection of the substrate edge through or alongside the film.
3Reliability
If the bezel pattern is positioned to protect the thin glass substrate edge, then the durability is improved, but the alignment precision with the display region deteriorates
Solution Approach 1:
The patent segments the protective structure into multiple functional layers: the bezel pattern provides structural protection and alignment reference, while the extended plastic film provides additional cushioning protection. This segmentation allows each layer to optimize its specific function - the bezel pattern maintains alignment precision with the display region, while the plastic film extension provides enhanced protection without compromising the bezel's positioning accuracy.
Data Source
AI summary
A display device includes a display module having a display region and a non-display region, and a window module disposed on the display module. The window module includes a thin glass substrate, a window protective layer disposed on the thin glass substrate, and a bezel pattern disposed on a surface of the thin glass substrate or disposed on a surface of the window protective layer. The bezel pattern overlaps the non-display region. The edge of the thin glass substrate does not overlap the bezel pattern in a plan view, and the edge of the thin glass substrate is not aligned with the outer edge of the bezel pattern in a plan view.