Sensor Layer Loop Electrodes for Noise-Resistant Pen Input
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Solution Overview
Problem
Existing touch-based input systems for multimedia electronic devices face challenges in accurately sensing inputs from a pen due to noise interference, which complicates the recognition of pen touches.
Innovation Solution
The electronic device incorporates a sensor layer with a specific configuration of electrodes and loop trace lines, along with a sensor driver that utilizes differential amplifiers and an analog-to-digital converter to process signals and reduce noise, allowing for effective pen input sensing without the need for a digitizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch-based input system uses a pen for sketching or drawing, then the user can perform detailed input operations, but noise is introduced that makes it difficult to recognize the touch or approach of the pen
Solution Approach 1:
The sensor layer is divided into multiple independent electrode types (first electrode, first loop electrode, first auxiliary electrode, second electrode, second loop electrode, second auxiliary electrode), each serving specific sensing functions. This segmentation allows the system to process different signal components separately, enabling noise filtering while preserving pen input signals.
Solution Approach 2:
Loop trace lines are introduced as intermediary elements that form closed loops with loop electrodes. These loop structures act as mediators that detect pen approach through electromagnetic induction while being less susceptible to noise from actual pen touches, providing a reference signal for noise cancellation.
2Measurement precision
If a digitizer is added to improve pen sensing capability, then pen input detection accuracy improves, but the device's thickness, weight, and flexibility are adversely affected
Solution Approach 1:
The sensor layer is designed to perform multiple functions simultaneously: it detects both touch inputs and pen inputs using the same electrode structures. The first and second electrodes sense touch, while the loop electrodes and auxiliary electrodes sense pen approach, eliminating the need for separate digitizer layers.
Solution Approach 2:
The sensor layer uses its own electrode structures (loop electrodes and auxiliary electrodes) to sense pen inputs, rather than requiring external digitizer components. The system serves itself by utilizing the existing sensor layer infrastructure for dual-purpose input detection.
3Reliability
If the sensor layer uses multiple electrodes and loop trace lines, then noise reduction and pen sensing capability improve, but the manufacturing complexity increases
Solution Approach 1:
Multiple electrode functions are merged into a single sensor layer structure. The first and second electrodes, along with their respective loop electrodes and auxiliary electrodes, are integrated in the same layer, allowing simultaneous fabrication through standard transparent conductive oxide (TCO) deposition processes without requiring separate manufacturing steps.
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 enhances the sensitivity and accuracy of pen input sensing, reducing noise interference and improving the signal-to-noise ratio, thereby enabling reliable pen input detection without increasing the device's thickness, weight, or degrading its flexibility.
Implementation Method 1
The sensor driver may include a differential amplifier, and a first terminal of the differential amplifier may receive the first signal, and a second terminal of the differential amplifier receives the second signal
Implementation Method 2
The sensor driver may include a plurality of differential amplifiers and an analog-to-digital converter. The plurality of differential amplifiers may receive the first signal and the second signal, respectively. The analog-to-digital converter may receive a plurality of signals from the plurality of differential amplifiers
Data Source
AI summary
An electronic device includes a sensor layer and a sensor driver. The sensor layer includes a first electrode, a first auxiliary electrode overlapped with the first electrode, a first loop electrode overlapped with the first electrode, a first loop trace line electrically connected to a first end portion of the first loop electrode, and a second loop trace line electrically connected to a second end portion of the first loop electrode that is spaced apart from the first end portion. The first loop electrode, the first loop trace line, and the second loop trace line are connected in a first closed loop.