Through-Hole Display Panel Crack Detection Without Short Circuits
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Solution Overview
Problem
The presence of residual metal layers at the edge of through holes in display panels with under-display cameras can cause failures in crack detection due to short circuits, compromising the accuracy of crack detection in the display area.
Innovation Solution
The implementation of an annular non-display area with nested annular blocking dams and a through-hole crack detecting line, featuring input and output wiring portions connected via a winding portion, and a connecting portion between the dams to prevent short circuits by isolating the wiring from residual metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a circle of crack detecting line is arranged at the edge of the dug hole, then crack detection capability is improved, but residual metal layer causes short circuit and detection failure
Solution Approach 1:
The crack detecting line is segmented into multiple parts: a first detecting line portion arranged at the edge of the through-hole, a second detecting line portion arranged in the annular non-display area, and a connecting portion connecting these two portions. This segmentation allows the detecting line to bypass the residual metal layer at the through-hole edge by routing part of the detection path through the safe annular non-display area, thus maintaining detection reliability while preserving crack detection capability.
2Area of stationary object
If through hole is created for under-display camera, then screen-to-body ratio is improved, but crack risk at hole edge increases
Solution Approach 1:
A blocking dam is formed at the edge of the through-hole before arranging the crack detecting line. This preliminary action creates a protective barrier that prevents cracks from propagating from the through-hole edge into the display area. The blocking dam is positioned to intercept potential cracks before they can reach the displaying area, thus addressing the crack risk issue while maintaining the through-hole structure for the under-display camera.
Solution Approach 2:
The annular non-display area serves as an intermediary zone between the through-hole and the display area. By placing part of the crack detecting line in this intermediate region and using it as a detection path, the system can monitor for cracks in the through-hole edge without having the detecting line directly exposed to the high-risk edge area, thus reducing crack risk while maintaining detection capability.
3Reliability
If annular non-display area with blocking dams is added, then crack detection reliability is improved, but device complexity increases
Solution Approach 1:
The annular non-display area is designed to serve multiple functions: it provides a safe region for routing the crack detecting line away from residual metal layers, contains the blocking dam structure to prevent crack propagation, and maintains the overall structural integrity of the display panel. By making this region multi-functional, the design achieves improved reliability without adding separate dedicated structures for each function, thus limiting the increase in device complexity.
Data Source
AI summary
A display panel includes a display area including at least one through hole and an annular non-display area between the through hole and the display area enclosing the through hole. The annular non-display area includes: at least two annular blocking dams, a through-hole crack detecting line, and a connecting portion. The annular blocking dams enclose the through hole and are mutually nested. Adjacent annular blocking dams are spaced at a predetermined distance. The through-hole crack detecting line comprises an input wiring portion, an output wiring portion and a winding portion. The input wiring portion and the output wiring portion are connected through the winding portion. The input wiring portion and the output wiring portion extend to the display area. The winding portion is around the edge of the through hole. The connecting portion is between the annular blocking dams and connecting some areas of the annular blocking dams.