Polymer Display Window with Blue Binder for Adhesion and Yellowing
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Solution Overview
Problem
Current plastic windows for display devices face issues with adherence and yellowing due to physicochemical differences between polymer resins and binders, leading to reliability concerns, especially in portable devices where external impacts can cause damage.
Innovation Solution
A window structure comprising a polymeric substrate, a polymer layer, a binder layer with a blue colorant, and a hard coating layer, where the binder layer includes a binder and a blue colorant, and the polymer layer is made from materials like polycarbonate, polymethylmethacrylate, or cycloolefin polymers, with specific thickness ranges and a manufacturing method involving film insert injection molding to improve adherence and prevent yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a window is made of glass, then it has high strength and durability, but it is easily broken by external impact and damaged in portable devices
Solution Approach 1:
The patent replaces rigid glass with a flexible polymer-based window structure consisting of a polymeric substrate and a polymer resin layer. This flexible structure absorbs impact energy through deformation rather than fracturing, significantly improving impact resistance while maintaining window functionality in portable devices
Solution Approach 2:
The patent creates a composite window structure by combining the polymeric substrate with a polymer resin layer and binder. This composite material approach allows the window to achieve both flexibility for impact resistance and sufficient structural strength, resolving the contradiction between glass hardness and impact vulnerability
2Object-affected harmful factors
If a window is made of plastic material with polymer resin and binder, then impact resistance improves, but yellowing occurs and adherence deteriorates due to physicochemical characteristic differences
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder by incorporating specific functional groups and adjusting the ratio of polymer resin to binder. These parameter changes enhance the physicochemical compatibility between layers, improving adherence while maintaining impact resistance
Solution Approach 2:
The patent addresses yellowing by selecting polymer resins and binders with inherent UV stability and appropriate color characteristics. The formulation prevents yellowing through material selection rather than adding colorants, maintaining both reliability and aesthetic appearance
3Strength
If the polymer resin layer is made thicker to improve impact resistance, then strength improves, but the window thickness increases and may affect display performance
Solution Approach 1:
The patent achieves high impact resistance with reduced thickness by optimizing the composite structure. The polymeric substrate provides baseline strength, while the polymer resin layer adds impact protection. This layered composite approach delivers enhanced protection without proportionally increasing overall thickness
Solution Approach 2:
The patent utilizes the inherent flexibility and energy-absorbing characteristics of thin polymer films to provide impact resistance. The thin polymer resin layer deforms elastically under impact, dissipating energy without requiring significant thickness, thus maintaining both protection and display performance
Data Source
AI summary
A window for a display device, the window including a polymeric substrate, a polymeric layer disposed on a side of the polymeric substrate, and a binder layer interposed between the polymeric substrate and the polymer layer, wherein the binder layer includes a binder and a blue colorant.