Touch Display Assembly with PPS Support Piece and Air Gap
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Solution Overview
Problem
Existing touch display assembly methods for smartphones are prone to damage during rework due to the need for accurate alignment and complete surface bonding of capacitor type touch panels and display panels, which compromises the device's lightness and thinness while maintaining touch functionality.
Innovation Solution
A touch display assembly structure featuring a plastic side frame with a support piece made of polyphenylene sulfide, an adhesive layer, and an air layer between the touch panel and display panel, allowing for controlled thickness and reduced direct bonding to minimize damage during rework, while maintaining the required interval and supporting strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the capacitor type touch panel and display panel are bonded through a backing adhesive to maintain accurate alignment, then the alignment precision is improved, but the reliability deteriorates due to high possibility of damage during rework
Solution Approach 1:
The bonding structure is segmented into two parts: the touch panel is bonded to the support piece, while the display panel is bonded to the middle frame. This segmentation allows independent bonding of each panel to its respective support structure, enabling accurate alignment without requiring complete surface-to-surface bonding between panels, thereby reducing damage risk during rework.
Solution Approach 2:
A support piece made of polyphenylene sulfide is introduced as an intermediary component between the touch panel and display panel. This support piece provides a bonding surface for the touch panel while maintaining the required interval with the display panel, eliminating the need for direct adhesive bonding between the panels and reducing damage possibility during rework.
2Reliability
If the interval between touch panel and display panel is maintained at 0.4-0.6 mm to prevent damage, then the reliability is improved, but the device thickness increases
Solution Approach 1:
The support piece is designed with a thickness of 0.2 mm, which is less than the traditional 0.4 mm requirement. By changing the parameter of support piece thickness and using material with appropriate mechanical properties, the invention maintains the necessary interval (0.4-0.6 mm) between panels for damage prevention while reducing the overall device thickness.
3Strength
If complete surface bonding is used to ensure structural stability, then the strength is improved, but the ease of repair deteriorates due to difficulty in separation during rework
Solution Approach 1:
The bonding structure is divided such that the touch panel bonds to the support piece while the display panel bonds to the middle frame. This segmentation means that during rework, only the touch panel needs to be separated from the support piece, not the entire assembly, making repair easier while maintaining structural stability through the distributed bonding arrangement.
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 reduces the risk of damage to touch and display panels during rework, maintains the thinness and lightness of smartphones, and ensures accurate alignment without compromising touch functionality.
Implementation Method 1
The adhesive layer bonds the capacitor type touch panel and the support piece
Data Source
AI summary
A touch display assembly structure is disclosed, which includes a capacitor type touch panel, a display panel, a plastic side frame, and an adhesive layer. The plastic side frame includes a side frame edge and a support piece disposed inner the side frame edge. The support piece is disposed between the touch panel and the display panel. The support piece has an opening to expose a display area of the display panel. The adhesive layer bonds the capacitor type touch panel and the support piece. There is an air layer disposed between the touch panel and the display panel. The material of the support piece includes polyphenylene sulfide. The thickness of the support piece is less than 0.4 mm.