Single-Sided Capacitive Touch Screen Layout for Lower RC Delay
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Solution Overview
Problem
Existing touch screens with ITO-based conductive films have low recognition speed and high manufacturing costs due to the complexity of forming fine patterns and the need for additional compensating chips, making them unsuitable for large-area applications.
Innovation Solution
A single-sided one-sheet capacitive touch screen design featuring a substrate with a first conductive pattern and a second conductive pattern on the same surface, connected by a transparent conductive bridge with an insulating layer, allowing for simplified manufacturing and reduced thickness without the need for lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If ITO-based conductive film is used for large-area touch panel, then coverage area is improved, but recognition speed deteriorates due to self-RC delay
Solution Approach 1:
The conductive pattern is divided into multiple segments (first conductive pattern and second conductive pattern) that are electrically connected through transparent conductive bridges. This segmentation reduces the RC delay by breaking the continuous conductive path into smaller segments, thereby improving recognition speed while maintaining large-area coverage.
2Speed
If additional compensating chip is introduced to solve RC delay, then recognition speed is improved, but manufacturing cost increases
Solution Approach 1:
The compensating function is merged into the main substrate by forming conductive patterns and transparent conductive bridges directly on the substrate. This eliminates the need for separate compensating chips, thereby improving recognition speed while reducing manufacturing cost and simplifying the overall structure.
3Device complexity
If conductive pattern is used to replace ITO pattern, then manufacturing complexity is reduced, but pattern precision and visibility deteriorate
Solution Approach 1:
The invention uses a composite structure combining metal conductive patterns with transparent conductive bridges. The metal patterns provide precise geometric definition and ease of manufacture, while the transparent conductive bridges maintain electrical connectivity and optical transparency, thereby achieving both manufacturing simplicity and pattern precision.
4Stability of the object's composition
If multiple sheets are laminated to form touch screen, then structural stability is improved, but thickness increases and light transmittance deteriorates
Solution Approach 1:
Multiple functional layers (conductive patterns, transparent conductive bridges, insulating layers) are merged into a single-sheet structure. This integration maintains structural stability through proper layer bonding while minimizing overall thickness and maximizing light transmittance by eliminating the need for multiple separate sheet laminations.
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 design minimizes thickness, simplifies manufacturing, and enhances light transmittance, reducing installation complexity and avoiding the issues of bubble formation during lamination, while maintaining effective touch screen performance.
Implementation Method 1
a transparent insulating part disposed between the transparent conductive bridge and the first conductive pattern to electrically insulate the transparent conductive bridge and the first conductive pattern
Data Source
AI summary
Provided are a single-sided one-sheet type capacitive touch screen and a method for manufacturing the same. The touch screen includes: a substrate; a first conductive pattern disposed on the substrate in a vertical direction and including at least two pattern columns having two or more conductive pattern regions electrically connected with each other; a second conductive pattern disposed on the same surface of the substrate as the surface where the first conductive pattern is disposed, not being electrically connected with the first conductive pattern, and including two or more conductive pattern regions not electrically connected with each other; a transparent conductive bridge electrically connecting the conductive pattern regions of the second conductive pattern in a horizontal direction; and a transparent insulating part disposed between the transparent conductive bridge and the first conductive pattern to electrically insulate the transparent conductive bridge and the first conductive pattern.