Touch Sensor Layer With Peripheral Noise Measurement for Reliable Input
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Solution Overview
Problem
Existing multimedia electronic devices face challenges in improving sensing reliability and accuracy, particularly in touch-based input systems.
Innovation Solution
The electronic device incorporates a sensor layer with an active region and a peripheral region, featuring sensing electrodes, sensing lines, and a noise measuring electrode. A resistance control circuit with a variable resistor is included to enhance sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing lines are disposed in the peripheral region and connected to sensing electrodes, then the sensor layer can provide touch-based input functionality, but noise interference affects sensing reliability and accuracy
Solution Approach 1:
A noise measuring electrode is introduced as an intermediary element in the peripheral region to detect noise signals. This noise measuring electrode is spatially separated from the sensing electrodes by sensing lines, allowing it to measure noise without directly interfering with touch sensing. The measured noise signal is then used to compensate for interference in the sensing channels, thereby improving sensing reliability without requiring changes to the core sensing electrode structure.
2Measurement precision
If a noise measuring electrode is added to measure noise signals, then noise interference can be detected and compensated, but the device structure becomes more complex
Solution Approach 1:
The noise measuring electrode structure is designed to share the same peripheral region space with the sensing electrode connections. The first and second electrodes of the noise measuring electrode are disposed in different layers and overlap each other in plan view, allowing the noise measurement function to be integrated into the existing sensor layer architecture without adding significant structural complexity. The resistance control circuit also serves dual purposes by controlling both the noise measuring electrode and the sensing electrodes through shared control signals.
3Reliability
If the first electrode is spaced apart from sensing electrodes with sensing lines interposed, then noise measurement is isolated from sensing operations, but the resistance control circuit requires additional components
Solution Approach 1:
The resistance control circuit is designed to combine multiple control functions into a single integrated circuit block. The circuit controls both the noise measuring electrode and the sensing electrodes through shared control signals and common circuit elements. The first electrode and second electrode are disposed in different layers and overlap each other in plan view, allowing the resistance control to be implemented efficiently with reduced component count by merging the control paths for noise measurement and sensing operations.
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 configuration enhances sensing reliability and accuracy by effectively managing noise and improving signal processing, resulting in more precise touch-based inputs.
Implementation Method 1
The first electrode and the second electrode may form a noise capacitor
Data Source
AI summary
An electronic device includes a display layer, a sensor layer disposed on the display layer and including an active region and a peripheral region adjacent to the active region, and a sensor driver that drives the sensor layer. The sensor layer includes a plurality of sensing electrodes disposed in the active region, a plurality of sensing lines disposed in the peripheral region and connected to the plurality of sensing electrodes, and a noise measuring electrode disposed in the peripheral region. The noise measuring electrode includes a first electrode, and a second electrode. The sensor driver includes a first differential circuit including a first input terminal electrically connected to one of the plurality of sensing lines, and a second input terminal electrically connected to the first electrode.