Touch Panel Electrode Segmentation for Coordinate Precision
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Solution Overview
Problem
Existing touch panels face challenges in accurately detecting touch coordinates due to the proximity of sensor elements to the indicator, leading to stronger signals from touched elements and weaker signals from adjacent elements, which results in lower precision in detecting touch coordinates.
Innovation Solution
A touch panel design that includes a substrate with first and second touch detection electrodes, each comprising a main portion and sub-portions disposed between the main portions. These sub-portions are electrically connected to the main portions through connecting lines formed in different layers, allowing for improved signal acquisition from adjacent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cover glass is removed or made thinner to bring sensor elements closer to the indicator, then the signal strength from touched sensor elements increases, but the signal strength from adjacent sensor elements becomes too weak to be usable
Solution Approach 1:
The touch detection electrode is divided into multiple independent detection regions (first detection region, second detection region, third detection region, fourth detection region) arranged in a matrix pattern. This segmentation allows each region to independently detect touch signals, ensuring that even when one region's adjacent signals are weak, other regions can provide sufficient signal strength for accurate touch coordinate calculation.
Solution Approach 2:
The patent introduces a multi-layer structure with sensor elements arranged in both horizontal and vertical dimensions, creating a three-dimensional detection network. By adding the vertical dimension through multiple layers with different transparency levels, the system can detect touch signals from multiple depth levels, compensating for weak adjacent signals in any single layer.
2Reliability
If sensor elements are positioned closer to the indicator for stronger touch signals, then touch detection sensitivity improves, but the ability to detect touches between sensor elements deteriorates
Solution Approach 1:
The electrode is segmented into multiple detection regions with transparent connecting portions between them. This segmentation creates overlapping detection zones where touches between sensor elements can be detected by multiple adjacent regions simultaneously, maintaining both sensitivity and coordinate accuracy.
Solution Approach 2:
Transparent connecting portions act as intermediaries between adjacent detection regions. These connecting portions allow electrical connection while maintaining transparency, enabling the detection of touches that occur in the spaces between sensor elements by providing a continuous detection field across the entire electrode surface.
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
The design enhances the detection precision of touch coordinates by enabling the acquisition of signals from both the main and sub-portions of the touch detection electrodes, even when the indicator touches between the main portions, thus improving the accuracy of touch coordinate detection.
Implementation Method 1
a first touch detection electrode that is disposed on the substrate and generates capacitance between the first touch detection electrode and an indicator
Data Source
AI summary
A touch panel includes a first touch detection electrode including a first main portion and a first sub-portion, a second touch detection electrode including a second main portion and a second sub-portion, a first connecting line that connects the first main portion and the first sub-portion, and a second connecting line that connects the second main portion and the second sub-portion. The first sub-portion is disposed away from the first main portion. The second sub-portion is disposed away from the second main portion. The first and second sub-portions are disposed between the first and second main portions. The first and second connecting lines are formed in a layer that is a different layer from a layer in which the first and second touch detection electrodes are formed.