Dual-Substrate Capacitive Touch Panel With Separated Layer Fabrication
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Solution Overview
Problem
Conventional capacitive touch panels face low production yield and limited scalability due to the risk of scratching or staining of the upper touch sensitive layer during the fabrication of the lower touch sensitive layer, which restricts their application to large-size panels.
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 upper and lower layers, with insulation ink layers and conductive layers to protect the touch sensitive layers and improve yield.
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, resulting in significantly lowered production yield
Solution Approach 1:
The invention divides the touch panel into two separate glass substrates: a first glass substrate for forming the upper touch sensitive layer, and a second glass substrate for forming the lower touch sensitive layer. This segmentation allows both layers to be fabricated independently without the risk of damage to one layer during the fabrication of the other, thereby resolving the contradiction between ease of manufacture and production yield.
Solution Approach 2:
A transparent insulation adhesive layer is introduced as an intermediary between the first glass substrate (with upper touch sensitive layer) and the second glass substrate (with lower touch sensitive layer). This intermediary layer protects the upper touch sensitive layer from direct contact and potential damage during assembly and fabrication processes, enabling high-yield production while maintaining manufacturing flexibility.
2Device complexity
If the capacitive touch panel uses conventional single-substrate structure, then the fabrication process can be simplified, but the production yield is significantly lowered due to scratching or staining of the upper touch sensitive layer during lower layer fabrication
Solution Approach 1:
The touch panel structure is segmented into two separate glass substrates, each carrying one touch sensitive layer. This segmentation increases structural complexity but eliminates the risk of layer damage during fabrication, thereby improving production yield. The separate substrates can be processed independently and then bonded together, achieving both manufacturing simplicity and high yield.
Solution Approach 2:
The invention uses a composite structure combining two glass substrates with respective touch sensitive layers, connected by a transparent insulation adhesive layer. This composite structure allows each layer to be optimized and fabricated separately on suitable substrates, improving production yield while maintaining the necessary functional complexity through the combination of different materials and layers.
3Ease of manufacture
If the lower touch sensitive layer is exposed without protection during fabrication, then the fabrication process can be simplified, but the lower touch sensitive layer is easily collided and damaged
Solution Approach 1:
By segmenting the touch panel into two separate glass substrates, the lower touch sensitive layer on the second glass substrate is inherently protected from damage during the fabrication of the upper layer on the first glass substrate. Each layer can be fabricated on its own protected substrate, eliminating the risk of collision and damage while maintaining fabrication simplicity.
Solution Approach 2:
The lower touch sensitive layer is fabricated on a second glass substrate that serves as a protective carrier before final assembly. This beforehand protection ensures that the lower layer cannot be collided or damaged during subsequent processing steps, as it is already mounted on a rigid, protective substrate that can withstand handling and fabrication processes.
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.