Capacitive Touch Screen Panel Edge Metal Patterns
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Solution Overview
Problem
The fabrication process of capacitive overlay type touch screen panels is complicated due to the need for multiple masks and the complexity of maintaining the connection state of metal patterns, which affects the reliability of the touch screen panel.
Innovation Solution
The touch screen panel design features first and second sensing patterns on different layers, with metal patterns and conductive patterns at edge portions to simplify the fabrication process and maintain connections to position detecting lines, reducing the number of masks required and enhancing reliability by using conductive dummy patterns to stabilize metal pattern connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If first and second sensing patterns are formed from the same layer of material and connected through separate connection patterns with contact holes, then the sensing patterns can be connected to each other, but the number of masks utilized during fabrication increases and the fabrication process becomes complicated
Solution Approach 1:
The patent moves the first sensing patterns from the same layer as the second sensing patterns to a lower layer (below the insulating layer). This dimensional separation allows the first sensing patterns to be connected to position detecting lines through metal patterns at edge portions without requiring separate connection patterns through contact holes, thereby reducing the number of masks and simplifying the fabrication process while maintaining reliable connections
Solution Approach 2:
The patent introduces metal patterns as an intermediary element that directly connects the first sensing patterns (on the lower layer) to the position detecting lines. These metal patterns are formed at edge portions of the region where sensing patterns are formed, eliminating the need for separate connection patterns and contact holes, thus reducing fabrication complexity while ensuring reliable electrical connection
2Reliability
If metal patterns are used to connect first and second sensing patterns to position detecting lines, then the connection is established, but maintaining the connection state of metal patterns becomes complex and affects reliability
Solution Approach 1:
The patent positions the metal patterns at edge portions of the sensing pattern region during the initial fabrication process, below the insulating layer. This preliminary positioning ensures that the metal patterns are already in place to maintain the connection state of the first sensing patterns to position detecting lines, eliminating the need for subsequent maintenance or adjustment of connection states
Solution Approach 2:
By placing metal patterns on a lower layer (below the insulating layer) rather than on the same layer as the second sensing patterns, the patent creates a more stable structural arrangement. This dimensional separation allows the metal patterns to firmly support and maintain the connection state of the first sensing patterns without interference from upper layer structures, thereby improving ease of manufacture and reliability
Data Source
AI summary
A touch screen panel for an image display device or the like. The touch screen panel includes a transparent substrate; a plurality of first sensing patterns on the transparent substrate; an insulating layer on the first sensing patterns; a plurality of second sensing patterns on the insulating layer; and a plurality of metal patterns on the insulating layer and coupled to the first and second sensing patterns at edge portions of a region in which the first and second sensing patterns are formed. The metal patterns electrically couple the first and second sensing patterns to position detecting lines on the transparent substrate. The touch screen panel further includes first conductive patterns below the metal patterns positioned on edge portions of the insulating layer.