Projected Capacitive Touch Panel Single-Glass Integration
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Solution Overview
Problem
Conventional projected capacitive touch panels require two glasses, which reduces penetrability and increases manufacturing complexity, accuracy requirements, and costs due to the need for opaque rims to cover visible components, limiting their application and yield in consumer electronics.
Innovation Solution
A single-layer projected capacitive touch panel design featuring a glass cover with a touch sensing circuit layer, insulating ink layer with through slots filled with electric conductors, and a conductive wire layer that electronically connects the edges of the touch sensing circuit layer, allowing for thinner and more accurate assembly without the need for opaque rims.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two glasses are used in conventional projected capacitive touch panels, then the structural integrity and protection are improved, but the penetrability is reduced and manufacturing complexity increases
Solution Approach 1:
The patent merges the functions of two separate glass layers into a single glass substrate. The touch sensing circuit layer, insulating layer, and conductive layers are all integrated on one glass base, eliminating the need for a separate glass cover and optical glue layer. This reduces manufacturing steps, improves penetrability, and maintains structural integrity through proper layer integration.
Solution Approach 2:
The patent extracts and eliminates the unnecessary glass cover and optical glue layer from the conventional two-glass structure. By removing these redundant components, the design achieves better penetrability and simpler manufacturing while maintaining all necessary functional layers on the single glass base.
2Strength
If two glasses are adhered together with optical glue layer, then structural protection is improved, but manufacturing accuracy requirements increase and yield rate decreases
Solution Approach 1:
The patent combines all functional layers including touch sensing circuits, conductors, and insulators on a single glass base, eliminating the need for precise adhesion between two glass layers. This single-substrate approach removes the critical alignment and bonding accuracy requirements that plague conventional two-glass designs.
3Illumination intensity
If transparent optical glue layer is used, then optical properties are maintained, but insulator layer and FPC board become visible requiring opaque rims
Solution Approach 1:
The patent removes the transparent optical glue layer from the structure. By eliminating this layer entirely and integrating all functions on the single glass base, the design achieves full optical transparency without the need for opaque rims to mask visible components, thereby simplifying casing requirements.
4Shape
If opaque rims are added to cover visible components, then aesthetic appearance is improved, but manufacturing cost increases and application flexibility is reduced
Solution Approach 1:
The patent extracts and eliminates the need for opaque rims by removing the transparent optical glue layer that causes component visibility. The single-glass design with all integrated layers achieves inherent aesthetic appearance without requiring additional masking components, reducing manufacturing cost and improving application flexibility.
Data Source
AI summary
A 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 cover 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 layer.