Touch Panel Switching Unit Signal Segmentation
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Solution Overview
Problem
Large-size or high-resolution touch panels experience reduced sensitivity due to increased numbers of driving and readout lines, leading to a diminished voltage difference and poor sensibility of touch operations.
Innovation Solution
Incorporating a switching unit and amplifying unit in the touch panel to selectively transmit and amplify sensing signals, allowing only one switching unit to be turned on at a time, thereby reducing signal division across mutual capacitances and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the numbers of driving lines and readout lines are increased to achieve large-size or high-resolution touch panels, then the resolution and coverage area are improved, but the voltage difference is reduced and touch sensitivity deteriorates
Solution Approach 1:
The patent segments the sensing signal transmission by introducing switching units that selectively connect readout lines to sensing circuits. Only one switching unit is turned on at a time, dividing the signal transmission path into isolated segments. This prevents signal division across multiple mutual capacitances, maintaining sufficient voltage difference and touch sensitivity even with increased numbers of driving and readout lines for high-resolution applications
Solution Approach 2:
The patent applies preliminary action by pre-configuring switching units to selectively connect readout lines before signal transmission occurs. The switching units are controlled to establish proper signal paths in advance, ensuring that sensing signals are transmitted through dedicated paths without being divided among multiple capacitances, thereby maintaining voltage difference and sensitivity
2Measurement precision
If more driving lines and readout lines are used to increase resolution, then the measurement capability is improved, but the voltage difference generated by mutual capacitance changes is reduced
Solution Approach 1:
The sensing circuit is segmented into multiple independent detection channels, each with its own switching unit. This segmentation isolates the voltage difference measurement for each sensing point, preventing signal dilution across the entire array. Each channel maintains sufficient voltage difference for accurate detection even when the total number of lines increases for higher resolution
Solution Approach 2:
Switching units serve as intermediaries between readout lines and sensing circuits. These switching units selectively connect specific readout lines to sensing circuits based on scan signals, acting as mediators that control signal flow. This intermediary mechanism ensures that voltage differences are measured in isolated paths, maintaining detection precision despite increased system complexity
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 significantly improves the sensitivity of touch operations by amplifying the sensing signals, resulting in a more pronounced voltage difference and improved detection capabilities, especially in high-resolution applications.
Implementation Method 1
The readout line forms a mutual capacitance with the gate line, and the mutual capacitance is configured to generate a first sensing signal in response to a driving signal according to a touch operation
Data Source
AI summary
A touch panel is disclosed herein. The touch panel includes a driving line, a gate line, a readout line, and a switching unit. The driving line is configured to transmit a driving signal. The gate line is configured to transmit a scan signal. The readout line forms a mutual capacitance with the gate line, and the mutual capacitance is configured to generate a first sensing signal in response to a driving signal according to a touch operation. The switching unit is electrically coupled to the gate line and the readout line, and configured to be selectively turned on to transmit the first sensing signal to the readout line according to the scan signal.