Curved Display Edge Adhesive Structure for Reduced Stress Mura
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Solution Overview
Problem
Existing methods for forming curved display assemblies using glass suffer from optical defects such as light leakage due to stress mura in the glass layers, which are not effectively addressed by conventional adhesives and materials.
Innovation Solution
A curved display assembly is formed using a glass sheet with a higher elastic modulus adhesive along the overhanging edges of the display, which reduces stress mura by maintaining the cylindrical shape and minimizing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used to bond the curved display to the glass sheet, then the assembly can be formed, but optical defects such as light leakage occur due to stress mura in the glass layers
Solution Approach 1:
The patent applies different adhesive properties at different locations: a first adhesive with lower elastic modulus is used in the display region to minimize stress, while a second adhesive with higher elastic modulus is used at the perimeter to provide structural support and maintain cylindrical shape. This local differentiation resolves the contradiction by allowing each region to have the adhesive properties needed for its specific function.
Solution Approach 2:
The patent uses a composite adhesive system combining two adhesives with different elastic moduli. The first adhesive (lower modulus) and second adhesive (higher modulus) work together in a composite configuration, with the first adhesive bonding the display region and the second adhesive bonding the perimeter edges. This composite approach allows the system to simultaneously achieve optical quality and structural integrity.
2Shape
If the glass sheet is bent to form a curved display, then the desired curved shape is achieved, but stress mura occurs in the glass layers causing optical defects
Solution Approach 1:
The patent applies different adhesive properties at different locations: a first adhesive with lower elastic modulus is used in the display region to minimize stress, while a second adhesive with higher elastic modulus is used at the perimeter to provide structural support and maintain cylindrical shape. This local differentiation resolves the contradiction by allowing each region to have the adhesive properties needed for its specific function.
Solution Approach 2:
The patent changes the elastic modulus parameter of the adhesive material based on location. By selecting adhesives with specific elastic modulus values (first adhesive with lower modulus, second adhesive with higher modulus), the system optimizes the balance between maintaining curved shape and minimizing stress-induced optical defects.
3Ease of manufacture
If a single adhesive is used for bonding, then the manufacturing process is simple, but the assembly experiences both stress and light leakage issues
Solution Approach 1:
The patent applies different adhesive properties at different locations: a first adhesive with lower elastic modulus is used in the display region to minimize stress, while a second adhesive with higher elastic modulus is used at the perimeter to provide structural support and maintain cylindrical shape. This local differentiation resolves the contradiction by allowing each region to have the adhesive properties needed for its specific function.
Solution Approach 2:
The patent segments the bonding process into two distinct regions: the display region bonded with the first adhesive and the perimeter region bonded with the second adhesive. This segmentation allows each adhesive to be optimized for its specific region, improving overall assembly performance while maintaining a relatively straightforward manufacturing process.
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 use of a higher elastic modulus adhesive along the edges of the display significantly reduces light leakage, improving the optical performance and durability of curved glass displays.
Implementation Method 1
a first adhesive bonding the second display surface of the curved display to the second major surface of the glass sheet in the display region
Data Source
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AI summary
Emobidments of a curved display assembly are disclosed. The assembly includes a glass sheet having first and second major surfaces. The second major surface defines a first curvature of the glass sheet, and the first curvature has a bend axis. The assembly also includes a curved display having a second thickness between first and second display surfaces. The display has a display region and two overhanging edges adjacent to the display region and parallel to the bend axis. A first adhesive bonds the second display surface to the second major surface in the display region. A second adhesive is disposed between each of the two overhanging edges and the second major surface. The second adhesive has a higher elastic modulus than the first adhesive. The overhanging edges each extend a distance outside of the display area that is at least three times the second thickness of the curved display.