Mobile Terminal Glass Cover Bonding with Segmented Adhesive
Solution Overview
Problem
The bonding reliability between a touch control liquid crystal display and a mobile terminal housing is insufficient, leading to display detachment during reliability testing, especially with high screen-to-body ratio designs, as traditional adhesive tape solutions fail to provide adequate bonding force.
Innovation Solution
A structural component featuring a glass cover and touch control film stacked with a middle frame, where the glass cover is bonded using a stronger first bonding adhesive around its edge and the touch control film is bonded using a weaker second adhesive, with a protrusion structure and adhesive overflow groove to enhance bonding stability and prevent adhesive overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape is used for bonding the touch control liquid crystal display to the housing, then the touch control wire is protected from breaking, but the bonding force is insufficient for high screen-to-body ratio designs and the display falls off during reliability testing
Solution Approach 1:
The bonding area is segmented into two distinct regions: a first bonding area on the glass cover and a second bonding area on the touch control film. This segmentation allows different bonding methods and adhesive strengths to be applied to different components, optimizing both overall bonding reliability and component protection.
Solution Approach 2:
Different bonding characteristics are applied to different locations: the first bonding area uses strong bonding adhesive for robust attachment, while the second bonding area uses weaker bonding adhesive to protect the touch control wire. This local differentiation resolves the contradiction between overall bonding strength and component protection.
2Strength
If strong bonding adhesive is used for the entire display assembly, then bonding strength is improved, but the touch control wire may be damaged during detachment or repair
Solution Approach 1:
The bonding system is divided into two segments with different adhesive strengths. The second bonding area uses weaker adhesive specifically designed to allow safe detachment and repair of the touch control film without damaging the wire, while the first bonding area maintains strong bonding for overall structural integrity.
Solution Approach 2:
The bonding adhesive strength is locally optimized: strong adhesive in the first bonding area ensures overall bonding strength, while weak adhesive in the second bonding area enables easy repair and detachment. This local quality differentiation resolves the contradiction between bonding strength and ease of repair.
3Strength
If adhesive dispensing is used to bond the display, then bonding force is increased, but the touch control metal wire is broken
Solution Approach 1:
The bonding process is segmented into two stages with different adhesive applications. The first bonding area receives strong bonding adhesive for structural strength, while the second bonding area uses weaker adhesive that bonds the touch control film without exerting excessive force on the metal wire, preventing wire breaking.
Solution Approach 2:
The adhesive bonding force is locally differentiated to prevent wire damage. The weaker bonding adhesive in the second bonding area specifically protects the touch control wire from breaking during bonding, while the first bonding area provides the necessary overall bonding force.
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
This configuration significantly improves the bonding strength between the glass cover and the middle frame, enhancing the reliability of the structural component by ensuring secure attachment and preventing damage to the touch control wire during detachment.
Implementation Method 1
The first bonding area is adhesively connected to the middle frame by using first bonding adhesive
Implementation Method 2
the second bonding area is adhesively connected to the middle frame by using second bonding adhesive
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This application discloses a structural component and a mobile terminal. The structural component includes a middle frame, a glass cover, and a touch control film. The glass cover and the touch control film are disposed in a stacked manner. The touch control film is disposed on a surface that is of the glass cover and that faces the middle frame, and a side edge of the touch control film and a side edge of the glass cover do not overlap completely. The surface that is of the glass cover and that faces the middle frame is exposed to the touch control film, and an exposed area is a first bonding area. A surface that is of the touch control film and that faces the middle frame is a second bonding area. The first bonding area is adhesively connected to the middle frame by using first bonding adhesive, and the second bonding area is adhesively connected to the middle frame by using second bonding adhesive. Bonding force of the first bonding adhesive is greater than bonding force of the second bonding adhesive. In the foregoing implementation solution, the glass cover is bonded by using the first bonding adhesive, and the touch control film is bonded by using the second bonding adhesive. The first bonding adhesive is bonded to an edge of the glass cover, and the bonding force of the first bonding adhesive is greater than the bonding force of the second bonding adhesive. Therefore, bonding force between the glass cover and the middle frame is improved, and further reliability of the structural component that is in use is improved.