Integrated Touch Display Crosstalk Reduction via Electrode Modulation
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Solution Overview
Problem
Integrated touch sensitive displays face crosstalk issues between touch sensor stimulation signals and display signals when the touch sensor panel is integrated with the display, affecting the accuracy of touch event detection.
Innovation Solution
The implementation of rows and columns of touch electrodes with various modulation techniques allows sense circuitry to individually measure capacitance, determining the location and amount of touch or hover events by applying unique code sequences to each electrode, reducing crosstalk and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the touch sensor panel is integrated with the display device, then the space needed is reduced, but crosstalk occurs between touch sensor stimulation signals and display signals
Solution Approach 1:
The touch sensor panel is divided into multiple independently controllable regions or zones, allowing selective activation of touch electrodes in different areas. This segmentation enables the system to reduce crosstalk by activating only the necessary regions during touch detection, rather than illuminating the entire display area, thereby maintaining integration benefits while mitigating signal interference.
Solution Approach 2:
The touch sensor uses periodic scanning of touch electrodes with alternating activation patterns. By periodically switching between different electrode groups and synchronizing with display refresh cycles, the system can distinguish touch signals from display signals through temporal separation, reducing crosstalk while maintaining the integrated structure.
2Measurement precision
If modulation techniques are applied to touch electrodes to reduce crosstalk, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
Unique code sequences are pre-assigned to different touch electrode groups before touch detection begins. This preliminary encoding allows the sense circuitry to identify and separate signals from different electrodes through correlation detection, improving measurement precision without requiring complex real-time processing during actual touch events.
Solution Approach 2:
Modulation techniques use intermediate carrier signals or code sequences as mediators between the touch electrode stimulation and the capacitance measurement. These intermediate signals enable the sense circuitry to distinguish touch signals from display signals through signal processing, improving detection accuracy while keeping the hardware architecture relatively simple.
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 effectively reduces crosstalk and improves the accuracy of touch event detection by uniquely modulating each touch electrode, allowing for precise location and amount determination of touch or hover events, thereby enhancing the overall performance of integrated touch sensitive displays.
Implementation Method 1
sense circuitry to individually measure a capacitance associated with each of the touch electrodes. The capacitances can be used to determine a location and/or amount of touch or hover events at or near the integrated touch sensitive display
Data Source
AI summary
An integrated touch sensitive display is provided. The integrated touch sensitive display can include rows and columns of touch electrodes. Various modulation techniques can be applied to one or more of the touch electrodes to allow sense circuitry to individually measure a capacitance associated with each of the touch electrodes. The capacitances can be used to determine a location and/or amount of touch or hover events at or near the integrated touch sensitive display.