Display Device Substrate Edge Chamfering for Crack Resistance
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Solution Overview
Problem
Display devices, such as liquid crystal display devices, face challenges in enhancing the strength of glass substrates at their edges, which are prone to breakage and microcracking due to their fragile nature.
Innovation Solution
The implementation of chamfered edges on the glass substrates, specifically through the formation of inclined surfaces that reduce the width of the chamfered areas on one substrate compared to the other, enhances the structural integrity by preventing microcracks and microchipping, thereby improving the overall strength of the substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass substrates are used for display devices, then optical properties and manufacturing ease are improved, but edge strength and resistance to breakage deteriorate
Solution Approach 1:
The patent applies different structural characteristics to different parts of the substrate. Specifically, the edge portions are given a chamfered structure with inclined surfaces at predetermined angles, while the central display area maintains its original flat glass structure. This local modification strengthens the vulnerable edge regions without affecting the optical properties of the main display area.
Solution Approach 2:
The patent introduces curved inclined surfaces (chamfers) at the edges of the glass substrates. By replacing the sharp 90-degree edges with curved inclined surfaces at predetermined angles (e.g., 45 degrees), the stress concentration points are eliminated, and the edge strength is significantly improved while maintaining manufacturing feasibility.
2Strength
If chamfered edges are formed on glass substrates, then edge strength and resistance to microcracking are improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies predetermined angle ranges for the chamfered inclined surfaces (e.g., 30-60 degrees, preferably 45 degrees). By optimizing and standardizing these geometric parameters, the manufacturing process becomes more controllable and repeatable, reducing variability and defect rates while maintaining the strength benefits of chamfered edges.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate having a first surface, a second surface opposite to the first surface and a first side surface, and a second substrate having a third surface opposed to the first surface, a fourth surface opposite to the third surface and a second side. The first substrate has a first inclined surface which is continuous with the first surface and the first side surface, the second substrate has a second inclined surface which is continuous with the fourth surface and the second side surface, and a first width of the first inclined surface is less than a second width of the second inclined surface.