Curved LCD Panel Edge Grinding for Micro-Crack Prevention
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Solution Overview
Problem
Curved liquid crystal display panels face issues with micro-cracks during the cutting process, leading to reduced strength and a higher risk of fracture when bent for use in curved display devices, affecting product yield.
Innovation Solution
A curved liquid crystal display panel design with staggered arc-shaped side surfaces on the color film and array substrates, allowing for adequate grinding at critical edges to prevent micro-crack expansion under bending stress, combined with a side-coating adhesive and specific grinding processes like round corners or chamfers to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the array substrate is cut into smaller panels, then productivity increases, but micro-cracks occur at the edges reducing strength
Solution Approach 1:
The patent applies preliminary grinding treatment to the array substrate edges before cutting and bending processes. This preliminary action removes potential micro-crack formation sites at the edges, preventing crack expansion during subsequent processing and ensuring substrate strength is maintained despite increased cutting frequency for higher productivity
Solution Approach 2:
The grinding process creates a chamfer or rounded edge structure that acts as a preliminary anti-action against micro-crack formation. By pre-shaping the edges with appropriate geometry, the patent prevents the harmful concentration of stresses that would otherwise lead to cracking during cutting and bending operations
2Reliability
If the array substrate is ground at edges, then micro-crack expansion is prevented, but device complexity increases
Solution Approach 1:
The patent applies grinding treatment only to specific critical edges of the array substrate rather than the entire surface. The local quality principle is applied by focusing the grinding process on edges that will be subjected to bending stresses, creating different surface conditions in different locations based on their functional requirements
Solution Approach 2:
The patent employs chamfering or rounding of edge corners through grinding, transforming sharp angular edges into curved or beveled surfaces. This spheroidality principle reduces stress concentration at edge corners, preventing micro-crack initiation and propagation while maintaining manufacturing feasibility
3Strength
If staggered arc-shaped side surfaces are used, then bending stress is distributed evenly, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric staggered positioning of the color film substrate relative to the array substrate, creating arc-shaped side surfaces with different radii or positions on opposite sides. This asymmetric design distributes bending stresses more evenly during curved display panel formation while the grinding process ensures consistent edge quality despite the asymmetric geometry
Solution Approach 2:
The patent introduces arc-shaped side surfaces with specific curvature radii to the staggered substrate edges. These curved geometries facilitate even stress distribution during bending by eliminating sharp corners and creating gradual transitions, while the curvature parameters are optimized to balance structural strength with manufacturing feasibility
Data Source
AI summary
Provided is a curved liquid crystal display panel, including a color film substrate and an array substrate. An orthographic projection of the color film substrate on the array substrate is within the array substrate. The color film substrate includes a first side surface and a second side surface. The array substrate includes a third side surface and a fourth side surface. The first side surface is adjacent to and staggered from the third side surface. The second side surface is adjacent to and staggered from the fourth side surface. At positions where the third side surface and the fourth side surface are disposed, each of a side, proximal to the color film substrate, of the array substrate and a side, distal from the color film substrate, of the array substrate includes a structure formed by a grinding process.