Self-Capacitive Touch Panel Connection Line Resistance Balancing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The self-capacitive touch panel structure experiences unbalanced resistance values in connection lines, affecting the sensitivity and display quality due to the gradual increase in lengths of connection lines, leading to decreased touch sensing accuracy and signal noise ratio.
Innovation Solution
The self-capacitive touch panel structure is improved by ensuring that the cross-sectional area of connection lines increases gradually for each self-capacitance electrode, either by using more conduction lines or larger cross-sectional areas, to maintain approximately equal resistance values between electrodes and the touch detection chip, balancing resistance across different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If connection lines are extended to connect more self-capacitance electrodes, then the coverage area increases, but the resistance values become unbalanced
Solution Approach 1:
The patent applies local quality by varying the cross-sectional area of connection lines based on their position in the matrix. Connection lines are divided into multiple regions, and each region has a specific cross-sectional area designed to compensate for the cumulative resistance effect. This ensures that all self-capacitance electrodes, regardless of their position, have balanced resistance values to the detection chip.
Solution Approach 2:
The patent changes the physical parameter of the connection lines by adjusting their cross-sectional area. By increasing the cross-sectional area of connection lines in regions with longer paths, the resistance is reduced to maintain balance across the entire matrix. This parameter adjustment directly addresses the resistance unbalance issue while preserving the extended coverage area.
2Area of stationary object
If connection lines are made longer to reach distant electrodes, then the electrode coverage increases, but the sensitivity decreases
Solution Approach 1:
The patent implements local quality by creating different connection line specifications for different regions of the electrode matrix. Connection lines serving distant electrodes have larger cross-sectional areas compared to those serving nearby electrodes. This regional differentiation maintains uniform resistance characteristics across all electrodes, ensuring consistent touch sensing accuracy throughout the entire coverage area.
Solution Approach 2:
The patent modifies the cross-sectional area parameter of connection lines to compensate for increased path length. By adjusting this physical parameter, the resistance of long connection lines is reduced to match that of shorter lines, thereby maintaining measurement precision and sensitivity across all electrodes regardless of their distance from the detection chip.
3Reliability
If connection lines are increased in cross-sectional area to reduce resistance, then the resistance balance improves, but the material consumption increases
Solution Approach 1:
The patent applies local quality by strategically increasing the cross-sectional area of connection lines only in specific regions where it is necessary to compensate for longer paths. Rather than uniformly increasing the cross-sectional area across all connection lines, the design targets specific areas, thereby achieving resistance balance while minimizing overall material consumption.
Solution Approach 2:
The patent optimizes the cross-sectional area parameter of connection lines by making localized adjustments rather than global changes. This selective parameter modification achieves the desired resistance balance while controlling material usage, as only the necessary portions of the connection line network are enhanced in thickness.
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 solution balances resistance values across the touch panel, enhancing sensitivity and display quality by ensuring consistent touch detection and improved human-computer interaction.
Implementation Method 1
When a human body does not contact with the touch panel, a capacitance applied on each self-capacitance electrode is a fixed value. When a human body contact with the touch panel, a capacitance applied on a self-capacitance electrode which is corresponding to a touch location is the fixed value adding a human capacitance.
Implementation Method 2
Each self-capacitance electrode Rxy utilizes a single connection line Lyx to connect with the touch detection chip 1.
Data Source
AI summary
A self-capacitive touch panel structure includes a touch detection chip and multiple self-capacitance electrodes which are isolated with each other and arranged as a matrix. Each self-capacitance electrode is connected with the touch detection chip through a connection line, each self-capacitance electrode is connected with a corresponding connection line through at least one via hole. Wherein, for a same column of the multiple self-capacitance electrodes and according to a sequence of gradually far away from the touch detection chip, a cross-sectional area of a connection line connected with a following self-capacitance electrode is larger than a cross-sectional area of a connection line connected with a previous self-capacitance electrode such that resistance values of the connection lines connected between the self-capacitance electrodes and the touch detection chip are approximately equal. An in-cell touch panel and a liquid crystal display including above structure are also disclosed.