Single-Layer Projected Capacitive Touch Panel Design
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Solution Overview
Problem
Conventional projected capacitive touch panels require two glass layers, leading to reduced penetrability, high manufacturing complexity, and increased costs due to the need for precise glass adherence and opaque casing designs to hide visible components.
Innovation Solution
A single-layer projected capacitive touch panel is manufactured using a glass cover with a touch sensing circuit layer, insulating ink layer, conductive wire layer, insulator layer, and flexible printed circuit board, where the insulating ink layer covers the touch sensing circuit layer with through slots filled with electric conductors, and the FPC board is attached via a conductive glue layer, eliminating the need for optical glue and reducing visible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two glass layers are used in conventional projected capacitive touch panels, then structural protection and component coverage are improved, but penetrability is reduced and manufacturing complexity increases
Solution Approach 1:
The patent extracts and removes the optical glue layer from between the glass layers, eliminating the harmful factor (reduced penetrability) while maintaining structural protection through alternative adhesive methods that do not interfere with light transmission
Solution Approach 2:
The patent merges the protective functions of both glass layers into a single integrated glass structure, eliminating the need for intermediate adhesive layers and reducing overall layer count while maintaining structural integrity and protection
2Stability of the object's composition
If optical glue layer is used to adhere two glass layers, then structural bonding is improved, but manufacturing precision requirements increase and yield rate decreases
Solution Approach 1:
The patent removes the optical glue layer that caused manufacturing precision issues, replacing it with alternative bonding methods that are more tolerant of alignment variations and do not require the same level of precision
Solution Approach 2:
The patent employs temporary alignment fixtures or less precise but sufficient bonding methods that can be easily applied and removed, sacrificing the need for expensive, high-precision permanent adhesive systems
3Illumination intensity
If optical glue layer is used as transparent adhesive, then structural transparency is maintained, but visible components (insulator layer and FPC board) create design limitations requiring opaque rims
Solution Approach 1:
The patent extracts and removes the optical glue layer that made components visible, eliminating the need for opaque rims while maintaining optical transparency through alternative bonding approaches
Solution Approach 2:
The patent employs colored or opaque adhesive materials strategically placed to mask visible components like the FPC board and insulator layer, allowing the use of transparent glass layers without requiring opaque casing rims
4Strength
If conventional two-layer glass structure is used, then component protection is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges multiple layers (glass layers and optical glue) into a simplified single-layer glass structure with integrated protective functions, reducing manufacturing steps and material costs while maintaining component protection
Solution Approach 2:
The patent segments and reorganizes the layer structure to eliminate unnecessary intermediate layers, creating a more efficient manufacturing process with fewer assembly steps and lower overall complexity
Data Source
AI summary
A single-layer projected capacitive touch panel has a glass cover, a touch sensing circuit layer, an insulating ink layer, a conductive wire layer, an insulator layer, a conductive glue layer and a flexible printed circuit (FPC) board. The touch sensing circuit layer, the insulating ink layer, the conductive wire layer, the insulator layer and the conductive glue layer are mounted on a circuit surface of the glass cover in sequence. The insulating ink layer covers the touch sensing circuit layer and has multiple through slots. Each through slot is filled with an electric conductor. The FPC is fastened on the conductive wire layer by a conductive glue laver.