Display Device Cover Convexity Concavity Adhesive Bubble Control
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Solution Overview
Problem
Existing display devices face issues with air bubbles forming during the attachment of a cover and display panel, which can degrade display quality due to rapid adhesive spreading around convexities, leading to visible imperfections.
Innovation Solution
Incorporating a concavity on the cover's surface that overlaps the convexities on the display panel, allowing the adhesive to spread evenly and preventing air bubbles from remaining in the non-display area by ensuring they move beyond the convexities during the attachment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a convexity is provided on the display panel surface, then adhesive spreading is accelerated, but air bubbles remain trapped in the non-display area
Solution Approach 1:
The cover surface is segmented into a display area and a non-display area, with the convexity specifically positioned in the non-display area. This segmentation allows the convexity to accelerate adhesive spreading without affecting the visual quality of the display area, as the convexity and any resulting air bubbles are confined to the non-display region.
Solution Approach 2:
The convexity, which could potentially trap air bubbles and harm display quality, is strategically positioned in the non-display area where trapped air bubbles would not be visible. This converts the potential harm of air bubble formation into a benefit by using the convexity to accelerate adhesive spreading while keeping any defects hidden from view.
2Strength
If adhesive is applied to attach the cover, then the cover and display panel are joined, but air bubbles form and degrade display quality
Solution Approach 1:
The cover is designed with different surface qualities in different regions: the display area maintains a smooth, flat surface for optimal visual appearance, while the non-display area incorporates a convexity that promotes rapid adhesive spreading. This local differentiation allows the attachment process to be optimized in the non-display area without compromising the visual quality of the display area.
Solution Approach 2:
The convexity is pre-formed on the cover surface before the adhesive attachment process. This preliminary structural feature ensures that when adhesive is applied, it will naturally spread rapidly from the convexity region, proactively preventing air bubble formation in the display area before the attachment is complete.
3Speed
If the adhesive spreads rapidly around the convexity, then attachment speed increases, but air bubbles are trapped and become visible
Solution Approach 1:
The cover surface exhibits asymmetric geometry with a convexity positioned specifically in the non-display area. This asymmetric design creates asymmetric adhesive flow patterns, where the adhesive spreads rapidly around the convexity in the non-display region while maintaining controlled spreading in the display area, ensuring air bubbles are directed away from the visible region.
Solution Approach 2:
The problem of air bubble positioning is solved by transitioning from a two-dimensional surface consideration to a three-dimensional structural solution. The convexity introduces a vertical dimension (height) to the cover surface, creating a localized region that directs adhesive flow and air bubble movement in specific three-dimensional paths, ensuring air bubbles are confined to the non-display area.
Data Source
AI summary
According to one embodiment, a display device includes a display panel including a first surface over a display portion and a non-display portion therearound, a cover including a second surface opposing the first surface and an adhesive layer in contact with the first surface and the second surface, and the first surface includes a convexity projecting toward the cover in the non-display portion, and the second surface includes a concavity overlapping the convexity.