Integrated Touchscreen Electrodes for Low-Noise Touch Sensing
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Solution Overview
Problem
Capacitive touch sensor panels face errors due to parasitic or stray capacitances between touch node electrodes and other components, which can introduce offsets and reduce the accuracy of touch detection.
Innovation Solution
An integrated touchscreen design that includes light emitting diodes (LEDs) or organic light emitting diodes (OLEDs), display chiplets, and touch chiplets, with an integrated touch and display controller that provides control and timing signals, and reads touch data, while using electrodes capable of both display and touch functionality, and configuring touch chiplets to sense touch node electrodes in spectral analysis mode without stimulation to reduce noise at multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive touch sensor panels are used with transparent conductive plates, then transparency and ease of operation are improved, but parasitic capacitances between touch node electrodes and other components increase, reducing measurement precision
Solution Approach 1:
The patent segments the conductive plate structure into multiple isolated conductive regions (first conductive region, second conductive region, third conductive region) that are electrically separated. This segmentation reduces parasitic capacitance between touch node electrodes and other components while maintaining the overall transparency and touch functionality of the panel.
Solution Approach 2:
The patent applies different properties to different regions of the conductive structure. Specifically, certain conductive regions are designed with specific transparency characteristics while others are optimized for touch sensing, allowing each region to have the local quality needed for its specific function, thereby reducing parasitic effects while maintaining ease of operation.
2Device complexity
If integrated touch and display circuitry is implemented, then device complexity is reduced, but parasitic capacitances from integrated components increase, worsening measurement precision
Solution Approach 1:
The integrated circuitry is segmented into distinct functional regions with isolated conductive structures. By dividing the integrated circuitry into separate conductive regions that are electrically isolated, the patent reduces parasitic capacitance between touch sensing elements and display components while maintaining the benefits of integration.
Solution Approach 2:
The patent introduces intermediate conductive structures (such as guard rings or isolation layers) between the touch sensing circuitry and display circuitry. These intermediary elements act as barriers that reduce parasitic capacitance coupling between the two functional systems while allowing them to remain integrated on the same substrate.
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 reduces parasitic capacitances, improves touch sensing accuracy by minimizing noise and offsets, and enhances the signal-to-noise ratio, allowing for more precise detection of touch and proximity events across the touch screen.
Implementation Method 1
configuring touch chiplets to sense touch node electrodes in spectral analysis mode without stimulation to reduce noise at multiple frequencies
Implementation Method 2
The integrated touchscreen can include light emitting diodes or organic light emitting diodes (LEDs/OLEDs)
Implementation Method 3
The integrated touchscreen can include light emitting diodes or organic light emitting diodes (LEDs/OLEDs)
Implementation Method 4
in some capacitive-type touch sensing systems, fringing electric fields used to detect touch can extend beyond the surface of the display
Data Source
AI summary
An integrated touchscreen can include light emitting diodes or organic light emitting diodes (LEDs/OLEDs), display chiplets and touch chiplets disposed in a visible area of the integrated touch screen. For example, the LEDs/OLEDs, display chiplets and touch chiplets can be placed on a substrate by a micro-transfer tool. The integrated touchscreen can also include electrodes disposed in the visible area of the integrated touch screen. The electrodes can be capable of providing display functionality via the one or more display chiplets during display operation (e.g., operating as cathode terminals of the LEDs during the display operation) and capable of providing touch functionality via the touch chiplets during touch operation (e.g., touch node electrodes can be formed from groups of the electrodes and sensed). In some examples, the touch node electrodes can be formed and coupled to touch chiplets via the display chiplets.