Folded Display Circuit Board Sealing for Edge Protection
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Solution Overview
Problem
Display devices face issues with circuit board protection, leading to potential damage and appearance defects due to the exposed edges of circuit boards, which can compromise the integrity and aesthetics of the device.
Innovation Solution
A sealing material is applied to cover the top and side surfaces of circuit boards, ensuring comprehensive protection while compensating for the stepped portions formed by the circuit boards, thereby preventing visual defects and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit boards are exposed without sealing material, then device structure is simple and manufacturing is easy, but circuit boards are vulnerable to damage and appearance defects occur
Solution Approach 1:
The sealing material is divided into multiple portions: a first sealing portion covering the top surface of the circuit board, and a second sealing portion covering the side surface. This segmentation allows each portion to be optimized for its specific function while collectively providing comprehensive protection against the technical contradiction.
2Manufacturing precision
If sealing material covers the entire circuit board including stepped portions, then appearance defects are prevented, but manufacturing complexity increases
Solution Approach 1:
The sealing material is configured with different properties in different regions: the first sealing portion has a first thickness covering the top surface, while the second sealing portion has a second thickness covering the side surface. This local differentiation addresses appearance requirements in specific areas without unnecessarily complicating the entire manufacturing process.
3Ease of manufacture
If sealing material thickness is uniform, then manufacturing is simpler, but stepped portions of circuit boards are not properly compensated
Solution Approach 1:
The sealing material extends in multiple dimensions to address the stepped portions: it covers the top surface in one dimension and extends down the side surface in another dimension. This multi-dimensional configuration compensates for the circuit board's stepped structure while maintaining manufacturability through a unified sealing material design.
Data Source
AI summary
A display device includes: a display substrate having a display area and a pad area at one side of the display area; an optical layer on the display area of a first surface of the display substrate; a circuit board on the pad area of the display substrate; and a first sealing material on the pad area of the display substrate to cover the circuit board. The circuit board has: a first portion attached to the first surface of the display substrate, a second portion bent downwardly from the first surface and attached to another surface of the display substrate, and a third portion bent between the first portion and the second portion. The first sealing material covers at least some of the first portion and the third portion.