Cover Window with Protective Layer Preventing Coating Permeation
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Solution Overview
Problem
The coating process for flexible display devices often results in the permeation of coating solutions into the front surface of glass substrates, compromising the strength and manufacturing yield of cover windows.
Innovation Solution
A cover window design incorporating a glass substrate, a polymer film, an adhesive layer, and a protective layer, where the polymer film is disposed on the glass substrate, and the protective layer covers the side surfaces, preventing coating solution permeation and enhancing strength and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating process is performed on the glass substrate to improve strength, then the strength of the glass substrate is improved, but the coating solution permeates into the front surface of the glass substrate, compromising manufacturing yield
Solution Approach 1:
The patent divides the protective structure into multiple functional layers: a protective layer applied to the rear surface of the glass substrate, an adhesive layer bonding the polymer film to the glass substrate, and a polymer film providing additional protection. This segmentation allows the protective function to be distributed across multiple layers rather than relying on a single coating on the front surface, preventing coating solution permeation while maintaining strength enhancement.
Solution Approach 2:
The patent applies the protective layer to the rear surface of the glass substrate before performing the coating process on the front surface. This preliminary action creates a barrier structure that prevents coating solution from permeating into the glass substrate during the coating process, thereby protecting the manufacturing yield while still allowing the coating to enhance the front surface strength.
2Device complexity
If the cover window structure is simplified to reduce manufacturing complexity, then device complexity is reduced, but the ability to prevent coating solution permeation is compromised
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary between the glass substrate and the polymer film. This adhesive layer serves as a mediator that not only bonds the two components together but also acts as an additional barrier against coating solution permeation. The intermediary layer adds functionality without significantly increasing manufacturing complexity, as it is applied as part of the standard lamination process.
3Reliability
If a protective layer is added to cover the side surfaces to prevent coating solution permeation, then manufacturing yield is improved, but the device complexity increases
Solution Approach 1:
The patent merges the protective function with the existing structural components by applying the protective layer to the rear surface of the glass substrate, which is already part of the cover window assembly. The protective layer is integrated with the adhesive layer and polymer film structure, combining multiple functions (protection, bonding, and permeation prevention) into a unified multi-layer structure rather than adding separate independent components.
Data Source
AI summary
A cover window includes a glass substrate, a polymer film disposed on the glass substrate, an adhesive layer disposed between the glass substrate and the polymer film, a protective layer covering the adhesive layer and the glass substrate, and a light blocking portion disposed on at least one of the glass substrate and the polymer film. The protective layer covers a side surface of the adhesive layer, a side surface of the glass substrate, and one surface of the glass substrate. The cover window has improved strength and reliability.