Dual-Substrate Capacitive Touch Panel With Split Layer Fabrication
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Solution Overview
Problem
Conventional capacitive touch panels face low production yield and limited application to large-size panels due to the risk of the upper touch sensitive layer being scratched or stained during the fabrication of the lower touch sensitive layer, and the exposed lower layer being easily damaged.
Innovation Solution
The capacitive touch panel design includes a first glass substrate with a lower touch sensitive layer, a lower insulation ink layer, a lower conductor layer, and a flexible circuit board, allowing for separate fabrication processes for the lower and upper touch sensitive layers, with protective layers and conductive adhesive layers to enhance yield and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the upper touch sensitive layer is formed first on the first glass substrate, then the lower touch sensitive layer can be formed subsequently, but the completed upper touch sensitive layer is easily scratched or stained during the fabrication process of the lower touch sensitive layer
Solution Approach 1:
The patent divides the touch panel fabrication into two separate substrates: the upper touch sensitive layer is formed on the first glass substrate, while the lower touch sensitive layer is formed on a second glass substrate. This segmentation allows both layers to be fabricated independently without interfering with each other, eliminating the scratching and staining problems that occur when one layer is formed over another.
Solution Approach 2:
The patent introduces a flexible circuit board as an intermediary component that electrically connects the upper and lower touch sensitive layers formed on separate substrates. This intermediary allows the layers to be fabricated separately and then assembled together, avoiding direct contact during fabrication that would cause damage.
2Ease of manufacture
If the lower touch sensitive layer is formed first, then the upper touch sensitive layer can be formed subsequently, but the exposed lower touch sensitive layer is easily collided and damaged
Solution Approach 1:
By forming the lower touch sensitive layer on a separate second glass substrate rather than leaving it exposed on the first substrate, the patent provides inherent mechanical support and protection. The glass substrate acts as a protective carrier during fabrication and assembly, preventing collision and damage to the lower layer.
3Productivity
If separate fabrication processes are used for upper and lower touch sensitive layers, then production complexity increases, but production yield and suitability for large-size panels improve
Solution Approach 1:
The patent segments the fabrication process into two independent parallel processes: one for the upper layer on the first substrate and one for the lower layer on the second substrate. This allows simultaneous fabrication of both layers, increasing overall productivity and yield while the modular nature simplifies quality control and defect isolation.
Data Source
AI summary
A capacitive touch panel sequentially has a first glass substrate, a lower touch sensitive layer, a lower insulation ink layer, a lower conductor layer, a lower insulation layer, a lower conductive adhesive layer, a flexible circuit board, a transparent insulation adhesive layer, an upper insulation layer, an upper conductive adhesive layer, an upper conductor layer, an upper insulation ink layer, an upper touch sensitive layer and a second glass substrate. The aforementioned structure allows fabrication of the capacitive touch panel to be separated into a lower panel fabrication process and an upper panel fabrication process. The two independent fabrication processes prevent the capacitive touch panel from being damaged in one of the processes when the process is completed so as to increase the yield in production and further facilitate producing large-size touch panel.