Foldable Display Glass Edge Inspection via Segmented Printing Layers
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Solution Overview
Problem
In foldable electronic devices, it is difficult to inspect whether the edge of the glass on the front surface is cracked or chipped due to the placement of a printing layer along the edge of the active area, which obstructs visibility.
Innovation Solution
A configuration where a first printing layer is spaced apart from the edge of the glass and a second printing layer is disposed on the rear surface, allowing for inspection of the glass edge while alleviating the visual recognition of the edge structure, with the layers potentially overlapping when viewed from the front direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a printing layer is disposed along the edge of the active area to improve aesthetic performance and shield light, then the visual recognition of the edge structure is improved, but it becomes difficult to inspect whether the glass edge is cracked or chipped
Solution Approach 1:
The printing layer is divided into a first printing layer and a second printing layer positioned on opposite sides of the glass. The first printing layer is spaced apart from the glass edge, creating an inspection region, while the second printing layer is disposed on the rear surface. This segmentation allows the printing function to be distributed without completely obscuring the glass edge from inspection viewpoints.
Solution Approach 2:
The inspection capability is extended to multiple dimensions by placing printing layers on both the front and rear surfaces of the glass. The first printing layer is positioned at a distance from the edge in the front direction, while the second printing layer is positioned on the rear surface, creating a multi-dimensional arrangement that maintains inspection access while providing light shielding.
2Adaptability or versatility
If the thickness of the glass is decreased to enable the display to be folded or unfolded multiple times, then the adaptability of the display is improved, but the edge of the glass may be cracked or chipped
Solution Approach 1:
The printing layers are strategically positioned to provide localized protection and inspection capabilities. The first printing layer is spaced apart from the glass edge rather than covering it completely, allowing the edge to maintain its structural integrity while still providing light shielding in the active area. This localized approach preserves glass edge quality while enabling foldable functionality.
3Shape
If a printing layer is disposed along the edge of the active area to improve aesthetic performance, then the visual appearance is improved, but it obstructs the inspection of glass edge cracks or chips
Solution Approach 1:
The printing layer is segmented into front and rear portions with the front printing layer positioned at a distance from the glass edge. This creates an inspection region between the printing layer and the glass edge, allowing aesthetic coverage while maintaining visibility for quality inspection.
Solution Approach 2:
The spaced arrangement of the first printing layer from the glass edge creates an intermediary inspection region. This intermediate space serves as a visual buffer that allows inspectors to examine the glass edge for cracks or chips while the printing layer still provides aesthetic coverage and light shielding functionality.
Data Source
AI summary
Disclosed is an electronic device including: a foldable display panel, a glass disposed in a first direction facing a front surface of the display panel, a protection layer disposed in the first direction of the glass, a first printing layer disposed between the glass and the protection layer, and a second printing layer disposed in a second direction opposite a first direction, the first printing layer being spaced apart from an edge of the glass in a third direction facing an active area of the display panel, and one end of the second printing layer corresponds to an edge of the display panel.