Display Device Light-Shielding Layer Groove Bubble Management
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Solution Overview
Problem
Display devices with a light-shielding layer and a double-faced adhesive sheet face issues with bubble formation due to the thickness step between the light-shielding layer and the base material, causing bubbles to remain on the inner circumferential side of the light-shielding layer.
Innovation Solution
The introduction of grooves on the edge portion of the light-shielding layer's inner circumference, which are not deep enough to penetrate the layer, allows bubbles to flow into these grooves, reducing their presence near the inner circumference and maintaining light shielding functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is formed on the base material to rim the display area, then light shielding performance is improved, but bubble formation occurs due to the thickness step between the light-shielding layer and base material
Solution Approach 1:
The invention introduces grooves at specific locations (inner circumferential side of the light-shielding layer) where bubbles tend to form. These grooves create local variations in surface topology that allow bubbles to migrate to predetermined areas without compromising the overall light shielding function. The light-shielding layer maintains its light shielding property in most areas while having localized groove structures that manage bubble positioning.
2Area of stationary object
If the double-faced adhesive sheet is bonded across the stepped portion, then bonding coverage is improved, but bubbles remain trapped on the inner circumferential side of the light-shielding layer
Solution Approach 1:
The invention converts the harmful effect of the stepped portion (which traps bubbles) into a beneficial feature by introducing grooves that actively guide and contain bubbles in predetermined locations. The grooves transform the bubble trapping problem into a controlled bubble management system, where bubbles are directed to specific areas that do not affect display quality.
3Reliability
If grooves are introduced on the inner circumferential side of the light-shielding layer, then bubble retention is reduced, but the structure becomes more complex
Solution Approach 1:
The invention segments the inner circumferential side of the light-shielding layer by introducing multiple grooves instead of a single continuous structure. These grooves are arranged at specific intervals and positions, creating discrete bubble containment zones. This segmented approach effectively manages bubble distribution while maintaining a relatively simple manufacturing process compared to more complex alternative solutions.
Data Source
AI summary
A display device according to an aspect of the present invention includes a cover member and a display panel. The cover member includes a base material and a light-shielding layer provided in a frame-like manner. A double-faced adhesive sheet is provided so as to cover the surface of the base material and an edge portion on an inner circumferential side of the light-shielding layer. A plurality of grooves not deep enough to penetrate the light-shielding layer are provided on the edge portion on the inner circumferential side of the light-shielding layer to which the double-faced adhesive sheet is bonded. The grooves extend from the inner circumference toward an outer circumference of the light-shielding layer. The grooves are arranged side by side along the inner circumference of the light-shielding layer.