Curved Display Window Member with Differential Radii
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Solution Overview
Problem
Curved display devices face challenges with image distortions and shadows due to unintended refraction and light scattering, particularly at curved regions, where the difference in radii of curvature between inner and outer surfaces of the window body leads to visibility issues and stress on the display panel.
Innovation Solution
A window member with a window body formed by an injection molding process using transparent resins like polycarbonate or polymethylmethacrylate, featuring a curved portion with a thicker thickness than the flat portion and a transparent polymer resin layer with a protection layer, where the first radius of curvature of the inner surface is either greater or smaller than the second radius of curvature of the outer surface, reducing refraction and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the window body has a uniform thickness, then the manufacturing process is simpler, but image distortions and shadows occur due to unintended refraction and light scattering at curved regions
Solution Approach 1:
The window body is designed with non-uniform thickness, where the thickness varies at different locations. Specifically, the thickness at the curved portion is greater than at the flat portion, creating local quality differences that compensate for optical path variations and reduce image distortion and shadow effects
Solution Approach 2:
The thickness parameter of the window body is changed from uniform to variable. By adjusting the thickness distribution across different regions (flat vs. curved portions), the optical properties are optimized to minimize refraction and scattering effects while maintaining structural integrity
2Object-affected harmful factors
If the first radius of curvature of the inner surface is different from the second radius of curvature of the outer surface, then refraction and light scattering are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The radii of curvature parameters are optimized by making the first radius (inner surface) different from the second radius (outer surface). This parameter differentiation allows control over the optical path through the curved window, reducing unintended refraction and light scattering while the injection molding process achieves the required precision
3Reliability
If a transparent polymer resin layer and protection layer are added, then physical and chemical reliability is enhanced, but the device complexity increases
Solution Approach 1:
The window member is constructed as a composite structure with multiple layers: the window body (transparent resin), transparent polymer resin layer, and protection layer. Each layer serves specific functions - the window body provides structural support and optical clarity, the polymer resin layer adds flexibility and protection, and the outer layer provides scratch resistance and chemical stability
Solution Approach 2:
The transparent polymer resin layer acts as a flexible protective film that conforms to the curved shape of the window body. This thin film structure enhances reliability by providing mechanical protection and chemical resistance while maintaining the optical properties and flexible nature of the overall device
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 effectively minimizes image distortions and shadows at curved display regions, improving visibility and reducing stress on the display panel by carefully designing the radii of curvature and thickness of the window body, while enhancing physical and chemical reliability with the use of polyethylene-terephthalate or polyimide layers.
Implementation Method 1
The window body may be formed by an injection molding process that injects a melted transparent resin into a mold
Implementation Method 2
A first radius of curvature of an inner surface of the curved portion may be different from a second radius of curvature of an outer surface of the curved portion
Implementation Method 3
Curved display devices face challenges with image distortions and shadows due to unintended refraction and light scattering
Implementation Method 4
The window body may be attached to the transparent polymer resin layer by at least one of optically clear adhesive (OCA) or binder
Data Source
AI summary
A window member in a curved display device includes a window body having a flat portion and a curved portion. A first radius of curvature of an inner surface of the curved portion may be different from a second radius of curvature of an outer surface of the curved portion.