Protruding Frame Structure for Display Adhesive Stability
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Solution Overview
Problem
Touch display systems face challenges in maintaining structural stability and integrity due to differences in thermal expansion coefficients between the display panel and the frame, leading to potential separation of the adhesive structure at non-room temperatures.
Innovation Solution
The display device incorporates protruding structures and an adhesive structure that adheres to both the display panel and the frame, with a layered composition including an adhesive layer, molding layer, electromagnetic shielding layer, and insulating layer, which reduces the contact area between the adhesive and the frame, thereby minimizing the difference in contact areas and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive structure covers the entire frame surface to maximize bonding area, then the bonding strength is improved, but the thermal expansion difference between the display panel and frame causes adhesive separation at non-room temperatures
Solution Approach 1:
The adhesive structure is segmented into multiple discrete adhesive pads distributed across the frame, rather than a continuous adhesive layer. This segmentation allows the adhesive to accommodate thermal expansion differences between the display panel and frame while maintaining sufficient bonding strength through multiple attachment points.
Solution Approach 2:
The adhesive structure has different properties at different locations - the adhesive pads are positioned specifically at regions where bonding is most needed, while leaving gaps in regions where thermal expansion accommodation is more important. This local differentiation optimizes both bonding strength and thermal stress accommodation.
2Strength
If the adhesive structure is made thick to improve bonding, then the bonding strength is improved, but wrinkles, shrinkage, or peeling occur at non-room temperatures
Solution Approach 1:
The adhesive pads are designed as thin, flexible structures that can conform to the underlying surfaces while maintaining bonding strength. This thin-film approach prevents wrinkles and shrinkage that would occur with thicker adhesive layers, while the flexible nature allows accommodation of thermal expansion differences.
3Strength
If the adhesive structure covers the entire frame to maximize contact area, then the bonding strength is improved, but the difference in contact areas between display panel and frame adhesive leads to separation
Solution Approach 1:
By dividing the adhesive structure into multiple discrete pads, the design equalizes the contact area ratio between the display panel and frame at each adhesive point. This segmentation ensures that the adhesive contact areas remain balanced even when the overall frame area is larger than the display panel area.
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 improves the structural strength and stability of the display device by reducing the chances of adhesive separation, preventing wrinkles, shrinkage, or peeling, and maintaining reliability across temperature and humidity tests.
Implementation Method 1
an adhesive structure adhering to the display panel and the frame
Implementation Method 2
due to differences in thermal expansion coefficients between the display panel and the frame
Data Source
AI summary
A display device includes a display pane, a frame, a first protruding structure, and an adhesive structure. The display panel has a display surface. The frame surrounds the display panel and has an opening. The first protruding structure is connected to and protrudes from the frame, in which the first protruding structure and the display surface are located at the same side of the frame and the display panel. The adhesive structure adheres to the display surface of the display panel, a top surface of the first protruding structure opposite to the frame, and the frame.