UV-Molded Polymer Layer for Foldable Display Visibility and Tactility
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Solution Overview
Problem
Existing electronic devices face challenges in maintaining visibility, durability, and camera resolution in deformable structures due to variable thickness implementations, which can lead to surface scratches and reduced tactile feedback.
Innovation Solution
A polymer layer with patterns formed through UV molding is applied to the display window, allowing for variable thickness and enhanced durability, while maintaining camera resolution and tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable thickness is implemented by CNC processing or laser processing, then the performance of folding, sliding, and rolling is secured, but the visibility of the variable thickness section decreases
Solution Approach 1:
The patent uses a mold that replicates the desired variable thickness pattern during polymer layer formation. The mold creates a negative impression that, when filled with polymer material and cured, produces a positive copy of the thickness variation pattern. This copying approach achieves the same functional result as CNC or laser processing but maintains surface uniformity and visibility.
Solution Approach 2:
The thickness variation pattern is predetermined and built into the mold design before the polymer layer is formed. By pre-configuring the mold with the desired thickness profile, the variable thickness structure is created during the forming process itself, eliminating the need for subsequent processing that would compromise visibility.
2Ease of operation
If protrusions are formed on the surface to enhance the feeling of being pressed and writing, then tactile feedback is improved, but camera resolution in the under display camera area is reduced
Solution Approach 1:
The patent applies different surface characteristics to different regions of the polymer layer. The tactile pattern is localized to specific areas where enhanced feedback is needed, while other regions maintain a smooth surface that does not interfere with camera resolution. This spatial differentiation of surface properties resolves the contradiction between tactile enhancement and optical clarity.
3Productivity
If a polymer layer with pattern is formed through UV molding, then variable thickness is easily realized and mass productivity is ensured, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical processing methods (CNC, laser) with a chemical curing process. The polymer layer is formed by pouring liquid polymer into a mold and curing it with UV light, which is a simpler, faster process suitable for mass production. This substitution of mechanical processing with photochemical processing reduces manufacturing complexity while enabling high-volume production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The UV-molded polymer layer ensures easy realization of variable thickness, enhances durability, and maintains camera resolution by preventing haze-induced resolution reduction and improving tactile feedback.
Implementation Method 1
a polymer layer on which a pattern is formed through an ultraviolet (UV) molding scheme
Data Source
AI summary
An electronic device may include a flexible display including a first window, and a polymer layer disposed on the first window to overlap at least a partial area of the first window and having a pattern formed on at least a partial area of the surface oriented in a direction away from the surface facing the first window, wherein each of the first window, the flexible display, and the polymer layer comprises a deformation part corresponding to a deformation axis and a planar part which is disposed on at least one side with reference to the deformation part, and the pattern may comprise a recess pattern formed in the lengthwise direction of the deformation axis in the deformation part of the polymer layer. In addition, various embodiments are possible.