High-Resolution Touch Panel with Segmented Capacitive Patterns
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Solution Overview
Problem
Capacitive touch panels face challenges in achieving high resolution while minimizing the area occupied by touch signal lines, requiring different unit pattern designs for various device sizes, which complicates the programming of touch integrated chips and leads to visibility issues and increased sensor signal line areas.
Innovation Solution
A touch panel design featuring first patterns formed by connecting second patterns with inverted phases at 180 degrees, using transparent conductive materials, and sensor signal lines connected at optimal distances to maintain consistent resistance values, with the ability to adjust pattern sizes and spacings based on distance from the touch IC to enhance resolution and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sizes of unit patterns are decreased to increase resolution, then the resolution is improved, but the number of touch signal lines connected to the unit patterns is exponentially increased
Solution Approach 1:
The unit pattern is divided into two separate patterns (first pattern and second pattern) that face each other. Each pattern is connected to its own sensor signal line, allowing the system to maintain high resolution through smaller pattern sizes while reducing the exponential increase in signal lines by sharing the space between the two patterns more efficiently
Solution Approach 2:
The patent transitions from a single-unit pattern approach to a dual-pattern approach arranged in a matrix configuration. By organizing patterns in rows and columns with patterns facing each other across gaps, the system achieves high resolution through spatial arrangement rather than simply increasing the number of individually connected patterns
2Measurement precision
If the number of touch signal lines is increased to support higher resolution, then the resolution is improved, but the area occupied by the touch signal lines in the touch panel is increased
Solution Approach 1:
The first pattern and second pattern are positioned adjacent to each other facing across a gap, effectively merging the sensing function into a single spatial unit. This allows multiple sensor signal lines to serve overlapping detection zones, reducing the total area required compared to having completely separate detection units
3Measurement precision
If the shapes of unit patterns are differently designed for each touch panel to match device sizes, then the touch detection accuracy is improved, but the driving schemes of touch integrated chips should be differently programmed for each touch panel
Solution Approach 1:
The unit pattern structure using two facing patterns with sensor signal lines connected at specific positions creates a universal design that can be applied across different touch panel sizes. The matrix arrangement and pattern configuration remain consistent, allowing the same driving scheme to work for various device dimensions without requiring different programming
4Measurement precision
If the touch patterns are extended from top side to bottom side of each column in matrix form, then the touch detection coverage is improved, but the number of sensor signal lines is further increased toward the bottom portion where the touch IC is positioned
Solution Approach 1:
Sensor signal lines are connected to the first and second patterns at specific local positions (vertices or edges) rather than extending continuously along the entire column. This localized connection approach maintains detection coverage while reducing the number of signal lines required in different regions of the touch panel
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 allows for high-resolution touch detection with minimized sensor line area, easy manufacturing adjustments for different device sizes, and improved visibility by reducing the recognition of touch patterns, maintaining consistent resistance values and preventing static electricity.
Implementation Method 1
a plurality of first patterns generating a touch capacitance Ct by approach or a touch of touch units
Data Source
AI summary
The present invention relates to a touch panel capable of detecting a capacitive touch input of a finger of a human body or a touch input tool having conduction characteristics similar to those of the finger, and more particularly, to a structure of a touch panel having a high resolution so as to detect a touch input tool having a diameter smaller than a unit pi. In a touch panel having a high resolution according to an exemplary embodiment of the present invention, it is possible to maintain high touch sensitivity while minimizing a change in structures of touch patterns depending on a size or a purpose of the touch panel.