Touch Sensor Panel Resistor Layout for Channel Resistance Equalization
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Solution Overview
Problem
Variations in resistance of conductive traces in touch screens can lead to errors in touch signal detection, inaccurate location determination, and phantom 'wobble' in detected object movement, affecting the accuracy of touch input recognition.
Innovation Solution
Incorporating resistors between touch electrodes and routing traces to equalize channel resistances, reducing differences in resistance and improving touch data comparison thresholds, and enhancing the accuracy of input device detection and location precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conductive traces of different lengths are used to connect touch electrodes to routing traces, then the touch sensor panel can cover a larger area and accommodate more electrodes, but the resistance variations in different channels increase, leading to errors in touch signal detection and location determination
Solution Approach 1:
The patent applies local quality by adding compensation resistors with different resistance values to different channels based on their specific needs. Each channel receives a tailored resistance compensation value that accounts for its unique trace length and resistance characteristics, thereby equalizing the total resistance across all channels without requiring uniform trace lengths throughout the entire touch sensor panel.
Solution Approach 2:
The patent changes the resistance parameter of individual channels by introducing compensation resistors with specific resistance values. This allows the system to adjust and equalize the total resistance (trace resistance + compensation resistor) across all channels, transforming the variable resistance condition into a controlled, equalized state that improves measurement precision.
2Adaptability or versatility
If conductive traces of different lengths are used to connect touch electrodes to routing traces, then the touch sensor panel can accommodate more electrodes, but the resistance differences cause errors in locating proximate objects and tracking object movement
Solution Approach 1:
The patent implements local quality by providing channel-specific resistance compensation through individually tailored resistors. This allows the system to maintain high object location accuracy in each channel despite using traces of different lengths to accommodate various electrode configurations across the touch sensor panel.
Solution Approach 2:
The patent achieves equipotentiality in terms of electrical resistance by equalizing the total resistance across all channels. This ensures that signal attenuation and electrical characteristics are uniform across the panel, enabling accurate object location and tracking regardless of the varying trace lengths required for different electrode positions.
3Ease of manufacture
If conductive traces with varying resistances are used, then the touch sensor panel can be manufactured with simpler routing, but the resistance variations cause phantom 'wobble' in detected object location and reduce touch sensing accuracy
Solution Approach 1:
The patent applies local quality by adding compensation resistors with different resistance values to different channels based on their specific trace characteristics. This allows the manufacturing process to use simple, varying trace lengths while still achieving precise touch location detection through localized resistance equalization in each channel.
Solution Approach 2:
The patent replaces the need for mechanically precise, equal-length trace routing with an electrical compensation approach. Instead of requiring complex mechanical alignment to ensure equal trace lengths, the system uses electrical resistance compensation through resistors to achieve the same effect, simplifying the manufacturing process while maintaining measurement precision.
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 solution improves the accuracy of touch input detection and location precision by equalizing channel resistances, reducing errors and phantom 'wobble' in touch screen systems.
Implementation Method 1
routing traces can have different lengths and, therefore, different resistances from one another. Including resistors coupled between the routing traces and touch electrodes can reduce the differences in resistance of each channel
Data Source
AI summary
In some examples, a touch screen includes resistors between the touch electrodes and routing traces. In some examples, the resistors can include a transparent conductive material included in the touch electrodes of the touch screen. The resistors can be located in a border region of the touch screen that can surround an active area of the touch screen that can include the touch electrodes and display pixels of the touch screen, for example. In some examples, the resistors included in the touch screen can have different resistances from each other and the same outer dimensions as one another. The resistors can reduce the variation in resistance from channel to channel in the touch screen, which can improve touch screen performance, for example.