Touch Panel Edge Protection via Injection Molding Casing
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Solution Overview
Problem
Single-layer touch panels have a poor collision-resistant capacity at their edge areas, making them prone to damage during the manufacturing process, which affects the overall thickness and integrity of electronic products.
Innovation Solution
A touch panel module with an integrated panel and casing, where the integrated panel includes a covering substrate, a decorating layer, a sensing electrode layer, a circuit layer, and a protective layer, and the casing is formed by injection molding to cover the edge of the panel, providing protection and bonding with the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a single-layer touch panel structure is used to reduce thickness, then the overall thickness of the electronic product is reduced, but the collision-resistant capacity of the edge area deteriorates
Solution Approach 1:
The touch panel is divided into a transparent region and a non-transparent region. The non-transparent region serves as a reinforcement zone that does not need to be transparent, allowing it to provide structural support and collision resistance to the edge areas without compromising the transparency needed for the display function.
Solution Approach 2:
Different regions of the touch panel are given different properties: the transparent region maintains optical transparency for display functionality, while the non-transparent region provides enhanced mechanical strength and collision resistance. This local differentiation allows each region to optimize its function without compromising the other.
2Length of stationary object
If a single-layer touch panel structure is used to reduce thickness, then the overall thickness of the electronic product is reduced, but the edge area is prone to damage during manufacturing
Solution Approach 1:
The non-transparent region is designed in advance as a protective buffer zone around the transparent region. This pre-positioned reinforcement structure provides beforehand cushioning that protects the vulnerable edge areas from damage during the manufacturing process, particularly during injection molding operations.
3Strength
If a protective structure is added to enhance edge area protection, then the collision-resistant capacity is improved, but the device complexity increases
Solution Approach 1:
The protective function is merged with the existing touch panel structure by integrating the non-transparent region directly into the panel design. This region simultaneously serves as both a structural reinforcement element and part of the touch sensing area, eliminating the need for separate protective components and reducing overall device complexity.
Solution Approach 2:
The non-transparent region performs multiple functions: it provides collision resistance, protects edge areas during manufacturing, and serves as part of the touch sensing structure. This multi-functionality reduces the need for additional specialized components, thereby simplifying the overall device structure.
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 protects the edge area of the touch panel during manufacturing, enhancing its durability and reducing the risk of damage, while simplifying the bonding process and reducing the number of forming steps.
Implementation Method 1
The casing is formed by injection molding, wherein one portion of the casing is arranged in the non-transparent region and formed on the protective layer, and another portion of the casing covers a circumferential lateral edge of the integrated panel
Data Source
AI summary
A touch panel module includes an integrated panel and a casing. The integrated panel defines a transparent region and a non-transparent region around the transparent region. The integrated panel has a covering substrate, a decorating layer disposed on the inner surface of the covering substrate and arranged in the non-transparent region, a sensing electrode layer disposed on the inner surface of the covering substrate and arranged in the transparent region, a circuit layer disposed on the decorating layer and electrically connected to the sensing electrode layer, and a protective layer at least covering par of the decorating layer and part of the circuit layer. The casing is formed by injection molding, wherein one portion of the casing is arranged in the non-transparent region and formed on the protective layer, and another portion of the casing covers a circumferential lateral edge of the integrated panel.