Capacitive Touch Screen Panel Metal Connection Segmentation
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Solution Overview
Problem
Capacitive touch screen panels face issues with sensitivity due to high surface resistance in transparent conductive materials and are prone to failures from static electricity, especially when metallic connection patterns are used, which also degrade display visibility.
Innovation Solution
The design incorporates a first sensing pattern connected by metal patterns and a transparent island pattern in the second sensing pattern, using low-resistance metallic materials like molybdenum, silver, or copper, to enhance electrical connectivity while minimizing the metallic area, thus reducing vulnerability to static electricity and improving visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of connection portion is increased to decrease surface resistance, then electrical conductivity is improved, but the overlapping area of connection portions is increased which increases capacitance and lowers sensing pattern sensitivity
Solution Approach 1:
The connection pattern is divided into multiple separate metal patterns instead of a single wide connection. Each metal pattern connects adjacent sensing patterns at different locations, distributing the connection function across multiple segments. This reduces the width of each individual connection while maintaining overall conductivity through parallel paths.
Solution Approach 2:
The connection is extended from a single-plane wide connection to a multi-dimensional structure using multiple metal patterns positioned at different locations and orientations. This allows electrical connection to be achieved through spatial distribution rather than increasing the width of a single connection area.
2Reliability
If connection patterns made of metallic material are used to connect sensing patterns, then electrical conductivity is improved, but the area of pixels is decreased which deteriorates visibility
Solution Approach 1:
The metallic connection area is segmented into multiple small metal patterns distributed across the touch screen rather than using large continuous metal regions. This reduces the total metallic area occupying pixel space while maintaining electrical connectivity through the distributed pattern structure.
Solution Approach 2:
Metallic material is applied locally only where connection is needed between sensing patterns, rather than using large areas of metal. The metal patterns are strategically positioned to provide necessary electrical connection while minimizing impact on pixel area and visibility.
3Reliability
If connection patterns made of metallic material are used, then electrical conductivity is improved, but the connection patterns are weak relative to static electricity which causes disconnection and failure
Solution Approach 1:
The connection structure is segmented into multiple metal patterns rather than relying on a single wide metal connection. This distribution reduces the stress concentration on any single metal pattern, making the overall connection system more resilient to static electricity damage.
Solution Approach 2:
The design incorporates multiple redundant metal patterns that can compensate if one pattern is damaged by static electricity. This provides a buffer against failure, as the distributed structure ensures that damage to one connection path does not necessarily cause complete disconnection.
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 configuration effectively prevents failures caused by static electricity and enhances the visibility of the display device by maintaining sensitivity and reducing the area of metallic material, resulting in a stable and efficient touch screen panel.
Implementation Method 1
a first connection pattern through which adjacent first sensing cells are electrically connected to each other... the first connection pattern includes at least two pairs of metal patterns... made of a low-resistance metallic material
Implementation Method 2
the capacitive touch screen panel converts a contact position into an electrical signal by sensing a change in the capacitance formed between a conductive sensing pattern and an adjacent sensing pattern
Data Source
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AI summary
A touch screen panel (100) comprises a first sensing pattern (130, 230) provided with first sensing cells (132, 232) arranged on one row along a first direction on a transparent substrate (110, 210), and a first connection pattern (138, 238) through which adjacent first sensing cells (132, 232) are electrically connected to each other. A second sensing pattern (140, 240) is provided with second sensing cells (142, 242) arranged on one column along a second direction on the transparent substrate (110, 210) so as to be spaced apart from the first sensing cells (132, 232), and a second connection pattern (144, 244) through which adjacent second sensing cells (142, 242) are electrically connected to each other. In the touch screen panel (100), the first connection pattern (138, 238) includes at least two pairs of metal patterns (134, 234) arranged so as to be spaced apart from one another, and a transparent pattern (136, 236) formed in the shape of an island in the second sensing pattern (140, 240) so as to be electrically connected to one or the other end of each of the metal patterns (134, 234).