Display-to-Midframe Bonding Structure for Warp-Resistant Assembly
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Solution Overview
Problem
The bonding strength between the display screen and the middle frame in electronic devices is weak, leading to potential warping and ingress of dust or water vapor, which can damage the display panel and affect device reliability.
Innovation Solution
Incorporating a second colloid with a lower elastic modulus and shear strength than the first colloid, bonded between the display screen's fixed portion and the middle frame's groove bottom wall, to enhance bonding reliability and absorb impact stress, while preventing detachment of the first colloid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display screen is bonded to the middle frame using only a cover, then the structure is simple, but the bonding strength is weak
Solution Approach 1:
The patent uses a composite bonding structure combining a cover and a bonding agent to achieve both structural simplicity and strong bonding. The bonding agent is applied between the cover and the middle frame, creating a composite system that leverages both the mechanical support of the cover and the adhesive properties of the bonding agent.
Solution Approach 2:
The bonding agent serves as an intermediary substance between the cover and the middle frame, enabling strong bonding while maintaining structural simplicity. This intermediary layer allows the two components to be firmly connected without requiring complex mechanical fastening structures.
2Ease of manufacture
If the bonding structure is simple (using only a cover), then the manufacturing process is easy, but the reliability is poor
Solution Approach 1:
By combining the cover with a bonding agent, the patent creates a composite bonding system that maintains ease of manufacture while significantly improving reliability. The bonding agent ensures strong adhesion between the cover and middle frame, preventing warping and protecting against dust and water vapor ingress.
Solution Approach 2:
The bonding agent acts as an intermediary that enhances the reliability of the bonding structure without complicating the manufacturing process. It provides reliable adhesion between components, ensuring the display screen remains securely bonded to the middle frame under various operating conditions.
3Force
If impact stress is applied to the display screen, then the first colloid may detach from the first main body portion, but using a second colloid with lower elastic modulus can absorb the impact stress
Solution Approach 1:
The patent changes the elastic modulus parameter of the colloid by introducing a second colloid with lower elastic modulus between the cover and middle frame. This parameter change allows the second colloid to absorb impact stress through elastic deformation, protecting the first colloid from detachment while maintaining bonding strength.
Solution Approach 2:
The second colloid with lower elastic modulus serves as a cushioning layer that absorbs impact stress before it reaches the first colloid. This beforehand cushioning prevents the first colloid from detaching during impact events, ensuring continuous reliable bonding between the display screen and middle frame.
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
Improves bonding reliability and reduces stress on the display screen, preventing warping and ingress of external contaminants, thereby enhancing the device's reliability and user experience.
Implementation Method 1
the second colloid has good elastic deformation performance, which can absorb impact stress and further perform elastic deformation
Implementation Method 2
The first colloid is bonded between the fixed portion and the first main body portion
Data Source
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AI summary
This application provides an electronic device, and relates to the field of electronic device technologies, to resolve a problem of how to improve bonding reliability between a display screen and a middle frame. The middle frame of the electronic device has an accommodating groove, and the accommodating groove includes a groove bottom wall. At least a part of the display screen is located in the accommodating groove. On the display screen, a fixed portion is located on a back side of a first main body portion, and a bending portion is connected between an edge of the first main body portion and the fixed portion. A first colloid is bonded between the fixed portion and the first main body portion. At least a part of a second colloid is bonded between the groove bottom wall and the fixed portion. An elastic modulus of the second colloid is less than or equal to 5 MPa. Alternatively, shear strength between the second colloid and the fixed portion is less than shear strength between the first colloid and the fixed portion, and is less than shear strength between the first colloid and the first main body portion. Alternatively, shear strength between the second colloid and the groove bottom wall is less than the shear strength between the first colloid and the fixed portion, and is less than the shear strength between the first colloid and the first main body portion.