ITO Film Etching for Capacitive Touchscreens
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Solution Overview
Problem
Existing methods for etching indium tin oxide (ITO) films on capacitive touchscreen panels result in poor display effects and low production efficiency due to obvious etching lines and the need for numerous laser etching processes, affecting touch recognition accuracy.
Innovation Solution
A method involving cross-cutting with two laser etching lines to form independent and unconnected ITO segments on the gap portion, with specific spacing and overlap to minimize parasitic capacitance and reduce the visibility of etching lines, allowing for efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single etching solution is used for both the ITO film and the gap portion, then the etching process is simplified, but the etching speeds cannot be independently controlled leading to poor manufacturing precision
Solution Approach 1:
The patent segments the etching process into two distinct steps: first etching the ITO film to a predetermined depth, then etching the gap portion. This segmentation allows independent control of etching parameters for each step, achieving precise depth control for both the ITO film (5-10 μm) and the gap portion (15-30 μm) without cross-interference, while still maintaining a relatively simple overall process flow.
Solution Approach 2:
The patent applies local quality by using different etching solutions with different etching speeds for different regions at different stages. The first etching solution has a first etching speed optimized for the ITO film, while the second etching solution has a second etching speed optimized for the gap portion, ensuring each region receives the appropriate etching conditions for its specific requirements.
2Manufacturing precision
If the ITO film is etched first and then the gap portion, then the etching depth can be precisely controlled, but the etching solution may remain in the concave portion causing additional problems
Solution Approach 1:
The patent implements continuous action by performing the second etching of the gap portion immediately after the first etching of the ITO film, without removing the ITO film in between. This continuous process ensures that the etching solution is actively flowing and being replaced throughout the etching sequence, preventing resin aggregates from forming in the concave portion while maintaining precise depth control.
Solution Approach 2:
The patent applies preliminary action by pre-planning the etching sequence to etch the ITO film first to a controlled depth, creating a specific geometry that facilitates subsequent gap etching. This preliminary etching step establishes the foundation for the second etching step, ensuring that the etching solution can properly access and etch the gap portion without causing resin aggregate formation.
3Ease of manufacture
If the ITO film is completely removed before etching the gap portion, then the gap can be etched freely, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent applies partial action by etching the ITO film only to a predetermined depth (5-10 μm) rather than completely removing it. This partial etching is sufficient to expose the underlying layer for gap etching while maintaining the ITO film structure, thereby simplifying the overall process and improving productivity compared to complete removal followed by separate handling.
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
This approach enhances display quality by eliminating obvious etching lines and significantly improves production efficiency by reducing processing time, ensuring accurate touch recognition without affecting signal accuracy.
Implementation Method 1
perform a first etching for etching the ITO film by use of a first etching solution having a first etching speed
Implementation Method 2
perform a second etching for etching the concave portion by use of a second etching solution having a second etching speed different from the first etching speed
Data Source
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AI summary
A capacitive touchscreen panel and a method for etching an indium tin oxide film on a gap portion of a capacitive touchscreen panel, the method for etching comprises using a laser etching line to cut ITO on the gap portion into a plurality of ITO segments, the ITO segments are independent of each other and are not connected to each other. The method for etching an indium tin oxide film on a capacitive touchscreen panel and a gap portion thereof of the present invention has high production efficiency, and the touchscreen product has a good display effect after etching.