Plastic Frame Height Difference Reduces Corner Stress
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Solution Overview
Problem
In liquid crystal display devices, especially three-sided edgeless modules, corner breakage often occurs due to stress concentration at uneven bonding parts, leading to defective products and reduced yield.
Innovation Solution
A plastic frame design with strategically formed first and second height differences and inclined surfaces reduces stress concentration by creating a more even supporting surface, preventing corner breakage during assembly and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bonding part is made uneven to facilitate assembly, then assembly ease is improved, but stress concentration occurs leading to corner breakage
Solution Approach 1:
The patent applies local quality by creating different height differences at different locations of the bonding part. The first height difference at the corner region is smaller (0.1-0.3mm) compared to the second height difference at the middle region, providing local optimization: the corner area has a flatter surface to reduce stress concentration and prevent breakage, while the middle area maintains sufficient height difference for assembly facilitation.
2Strength
If the height difference at the corner is reduced to prevent breakage, then corner strength is improved, but assembly facilitation is reduced
Solution Approach 1:
The patent resolves this contradiction by applying different height difference values to different regions. The first height difference at the corner (0.1-0.3mm) is optimized for strength, while the second height difference at the middle region is larger to maintain assembly facilitation. This local differentiation allows each region to optimize for its primary function.
3Device complexity
If the bonding part structure is simplified, then device complexity is reduced, but corner breakage resistance is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the height difference parameters at different locations of the bonding part. By changing the height difference from uniform to non-uniform (with specific values of 0.1-0.3mm at corners versus larger values at the middle), the patent improves corner breakage resistance without adding complex structural elements, maintaining simplicity while enhancing reliability.
Data Source
AI summary
A plastic frame includes a first frame having a first frame surface and a first end portion and a second end portion opposite to each other, and a second frame having a second frame surface, an end portion of the second frame being connected to the first end portion of the first frame. The first frame surface and the second frame surface are located on the same side of the plastic frame. A first height difference between the first frame surface at a first end portion of the first frame and the second frame surface is smaller than a height difference between the first frame surface at a middle portion of the first frame and the second frame surface. The first height difference may be, for example, 0.1-0.3 mm.