Touch Panel Module Sealing Adhesive Layer Bubble Prevention
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Solution Overview
Problem
Touch panel modules often experience functional failures due to air bubbles forming at the edges of the display screen after temperature shock tests, which existing technologies have not adequately addressed.
Innovation Solution
A touch panel module design that includes a display panel, a polarizing film, a first optical clear adhesive layer, a transparent touch layer, a second optical clear adhesive layer, a protective layer, and a sealing adhesive layer, where the sealing adhesive layer completely covers the sidewalls of the polarizing film, the first optical clear adhesive layer, the transparent touch layer, and the second optical clear adhesive layer, and fills the gap between the first optical clear adhesive layer and the display panel, preventing air bubbles from forming during bonding and temperature shock tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used without a sealing adhesive layer, then the device complexity is reduced, but air bubbles form at the edges during temperature shock tests causing functional failure
Solution Approach 1:
The sealing adhesive layer is applied in advance to completely cover the sidewalls of the polarizing film, first optical clear adhesive layer, transparent touch layer, and second optical clear adhesive layer before temperature shock testing occurs. This preliminary sealing action prevents air bubble formation at the edges during subsequent temperature variations, ensuring functional reliability without requiring complex post-processing steps.
Solution Approach 2:
The sealing adhesive layer acts as an intermediary element between the display panel components and the external environment. It mediates the interaction by providing a sealing barrier that prevents air ingress and bubble formation at the edges, while maintaining the overall structural integrity and optical performance of the touch panel module.
2Reliability
If the sealing adhesive layer completely covers sidewalls and fills gaps, then air bubble formation is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The sealing adhesive layer is applied in advance to completely cover the sidewalls of the polarizing film, first optical clear adhesive layer, transparent touch layer, and second optical clear adhesive layer before temperature shock testing occurs. This preliminary sealing action prevents air bubble formation at the edges during subsequent temperature variations, ensuring functional reliability without requiring complex post-processing steps.
3Adaptability or versatility
If the first optical clear adhesive layer extends outward forming a gap, then bonding flexibility is improved, but air bubbles can form at the edges
Solution Approach 1:
The sealing adhesive layer acts as an intermediary element between the display panel components and the external environment. It mediates the interaction by providing a sealing barrier that prevents air ingress and bubble formation at the edges, while maintaining the overall structural integrity and optical performance of the touch panel module.
Solution Approach 2:
The harmful factor (air) is extracted or excluded from the bonding interface by the sealing adhesive layer. The sealing layer creates a barrier that prevents air from entering the gap formed by the extending first optical clear adhesive layer, thereby eliminating the source of air bubble formation while preserving the bonding flexibility.
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 number of air bubbles larger than 0.1 mm per square centimeter to less than 1 after undergoing temperature shock tests between −51° C. and 96° C., ensuring the touch panel module's reliability in extreme temperature conditions.
Implementation Method 1
the sealing adhesive layer is formed between the display panel and the protective layer, completely covers sidewalls respectively of the polarizing film, the first optical clear adhesive layer, the transparent touch layer, and the second optical clear adhesive layer on a same side, and fills the gap
Implementation Method 2
The first optical clear adhesive layer is disposed on the polarizing film and extends outward from an edge of the polarizing film to form a gap with the display panel
Data Source
AI summary
A touch panel module includes a display panel, a polarizing film, a first optical clear adhesive layer, a transparent touch layer, a second optical clear adhesive layer, and a protective layer that are sequentially stacked on the display panel, and a sealing adhesive layer. The first optical clear adhesive layer extends outward from an edge of the polarizing film to form a gap with the display panel. The sealing adhesive layer is formed between the display panel and the protective layer, completely covers sidewalls of the polarizing film, the first optical clear adhesive layer, the transparent touch layer, and the second optical clear adhesive layer on the same side, and fills the gap. After undergoing a temperature shock test, a number of air bubbles with a size larger than 0.1 mm per square centimeter of the touch panel module is less than 1.