Bezel-Free Display Panel With Dual Peel Strength Adhesive Layers
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Solution Overview
Problem
Existing display technologies, such as liquid crystal and OLED panels, face issues with slow response time, high power consumption, short lifespan, and complex manufacturing processes, making them unsuitable for compact and efficient display solutions.
Innovation Solution
A bezel-free display apparatus with a display panel that includes a panel cover, adhesive layers with varying peel strengths, and inorganic light-emitting devices (ILEDs) mounted on a substrate, allowing for detachable and easily replaceable display modules with reduced manufacturing steps and gaps, and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a single adhesive layer is used to attach display modules to the panel cover, then the structure is simple, but the module replacement is difficult and reworking efficiency is low
Solution Approach 1:
The adhesive layer is divided into multiple sub-layers with different peel strengths. The first adhesive layer has a first peel strength that allows easy module replacement, while the second adhesive layer has a second peel strength that provides strong bonding to the panel cover. This segmentation enables both easy repair and reliable attachment.
Solution Approach 2:
Different portions of the adhesive structure have different adhesive properties. The first adhesive layer is designed with specific peel strength characteristics for easy module removal, while the second adhesive layer is designed with different peel strength characteristics for strong panel cover bonding. This local quality differentiation resolves the contradiction between easy replacement and secure attachment.
2Ease of manufacture
If display modules are permanently fixed to the panel cover, then the bonding strength is high, but the manufacturing complexity increases and reworking becomes difficult
Solution Approach 1:
The adhesive system provides different bonding characteristics at different stages. During manufacturing, the first adhesive layer allows for easy adjustment and repositioning of display modules. After assembly, the second adhesive layer provides strong permanent bonding. This dynamic behavior resolves the contradiction between manufacturing ease and attachment reliability.
3Strength
If thick adhesive layers are used to ensure strong bonding, then the attachment strength is high, but the light reflectivity increases and optical performance deteriorates
Solution Approach 1:
The peel strength of each adhesive layer is controlled within specific parameter ranges. The first adhesive layer has peel strength of 10-100 g/inch, and the second adhesive layer has peel strength of 500-2000 g/inch. These parameter specifications ensure adequate bonding strength while maintaining thin layer thickness to minimize light reflectivity and preserve optical performance.
Data Source
AI summary
The display panel includes: a panel cover; an adhesive layer positioned below the panel cover; and a plurality of display modules detachably attached to the panel cover by the adhesive layer. The adhesive layer includes: a first adhesive layer positioned on the plurality of display modules, and a second adhesive layer positioned on the first adhesive layer. A peel strength of the second adhesive layer is greater than a peel strength of the first adhesive layer.