Aluminosilicate Glass Cover Assembly for 3D LCD Displays
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Solution Overview
Problem
The design of cover assemblies for electronic display devices faces challenges in balancing lightness, rigidity, and image quality, with lighter structures prone to scratching and buckling, and stronger structures increasing weight and degrading image quality due to optical retardance issues.
Innovation Solution
A cover assembly using an aluminosilicate glass substrate with a thickness of less than 2 mm, achieving a 4-point bend strength of greater than 150 MPa and retardance of less than 5 nm over 170 in2, which is ion-exchanged to minimize retardance-induced visual defects and enhanced with anti-glare and anti-reflective surfaces for improved durability and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lighter plastic structures are used for the cover assembly, then weight is reduced, but the assembly becomes more flexible and prone to scratching and buckling
Solution Approach 1:
The patent employs a composite structure combining a thin glass substrate (0.1-0.5mm) with plastic components to create a cover assembly that is both lightweight and highly resistant to scratching and buckling. The glass provides the necessary strength and scratch resistance while the thin profile maintains lightness, resolving the contradiction between weight reduction and strength enhancement.
Solution Approach 2:
The patent changes the thickness parameter of the glass substrate to an optimized range (0.1-0.5mm) that provides sufficient mechanical strength and scratch resistance while maintaining minimal weight. This parameter optimization allows the cover assembly to achieve both lightness and durability simultaneously.
2Strength
If stronger and more rigid enclosures are used, then scratch resistance and rigidity are improved, but weight increases and fasteners become thicker and heavier
Solution Approach 1:
The patent optimizes the glass thickness parameter to the minimal effective range (0.1-0.5mm) that provides sufficient strength and rigidity without excessive weight. This parameter control ensures the cover assembly achieves the required mechanical properties while maintaining lightweight characteristics.
3Strength
If more fasteners are used to strengthen the assembly, then rigidity is improved, but the assembly becomes heavier and fasteners become thicker
Solution Approach 1:
The patent minimizes the number and size of fasteners by optimizing the structural design, using the smallest necessary fasteners to achieve the required rigidity. This reduces the overall weight while maintaining structural integrity.
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 solution provides a strong, lightweight, and aesthetically pleasing cover assembly that protects against scratches and impact, maintains image quality by minimizing retardance-induced defects, and ensures durability through controlled thickness variation and surface treatments, effectively addressing the design challenges of larger electronic display devices.
Implementation Method 1
the substrate is substantially free of retardance-induced visual defects
Data Source
AI summary
A cover assembly for a display device, such as a three-dimensional liquid crystal (3-D LCD) display. The cover assembly includes an aluminosilicate glass substrate that is substantially free of retardance-induced visual defects and has a thickness of less than 2 mm, a retardance of less than or equal to 5 nm over an area of at least 170 in2 (20 in diagonal), a 4-point bend strength of greater than 150 MPa.