Multi-Layer Sensor Stack for Accurate Touch and Pen Differentiation
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Solution Overview
Problem
Existing multimedia electronic devices lack an efficient mechanism to distinguish between touch inputs and pen inputs, leading to suboptimal user experience for applications requiring precise input, such as sketching or drawing.
Innovation Solution
A sensor layer with a multi-layered conductive structure comprising first to fourth conductive layers, each with specific electrode arrangements and bridge patterns, allowing for selective operation in touch or pen input modes, enabling precise differentiation between touch and pen inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor layer is used for both touch and pen input sensing, then device structure is simplified, but input precision and differentiation capability deteriorate
Solution Approach 1:
The sensor layer is segmented into four distinct conductive layers (first, second, third, and fourth conductive layers), each containing specific electrode patterns. The first and second conductive layers contain touch electrodes for touch input sensing, while the third and fourth conductive layers contain pen electrodes for pen input sensing. This segmentation allows independent optimization of touch and pen sensing capabilities while maintaining structural organization.
Solution Approach 2:
The sensor layer structure achieves multi-functionality by enabling both touch input sensing and pen input sensing within a single integrated sensor assembly. The sensor driving unit can selectively operate in different modes (touch mode or pen mode) by activating appropriate electrode combinations, allowing the same hardware structure to serve multiple input methods without requiring separate sensor systems.
2Measurement precision
If multiple conductive layers are added to differentiate touch and pen inputs, then input sensing precision is improved, but device thickness increases
Solution Approach 1:
Each conductive layer is constructed as a thin film structure containing electrode patterns. The use of thin conductive films allows multiple layers to be stacked closely together with minimal spacing, achieving the required input differentiation precision while maintaining overall sensor layer thinness. This prevents significant increase in device thickness despite the multi-layer configuration.
3Measurement precision
If separate electrode systems are used for touch and pen sensing, then sensing accuracy is improved, but electrode complexity and manufacturing difficulty increase
Solution Approach 1:
The electrode system is segmented into touch electrodes (first and second conductive layers) and pen electrodes (third and fourth conductive layers), with each segment serving a specific sensing function. This segmentation enables independent design and optimization of electrode patterns for different input types while maintaining clear manufacturing boundaries.
Solution Approach 2:
The touch electrode system and pen electrode system are merged into a single integrated sensor layer assembly with standardized manufacturing processes. Both electrode types share common structural elements (conductive layers, insulating layers, substrate) and can be manufactured using the same fabrication techniques, reducing overall manufacturing complexity despite the presence of multiple electrode systems.
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
Enables accurate sensing of both touch and pen inputs, enhancing user experience in applications that require detailed input, without increasing device thickness or weight.
Implementation Method 1
a sensor layer including a first conductive layer, a second conductive layer on the first conductive layer, a third conductive layer on the second conductive layer, and a fourth conductive layer on the third conductive layer
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An electronic device includes: a sensor layer including a first conductive layer, a second conductive layer on the first conductive layer, a third conductive layer on the second conductive layer, and a fourth conductive layer on the third conductive layer; and a sensor driving unit driving the sensor layer and selectively operated in a first mode of sensing a touch input or a second mode of sensing a pen input, wherein two conductive layers include: a plurality of first touch electrodes; and a plurality of second touch electrodes and insulated from and intersecting the plurality of first touch electrodes, and wherein another two conductive layers among the first to fourth conductive layers include: a plurality of first pen electrodes arranged in the first direction; and a plurality of second pen electrodes arranged in the second direction and insulated from and intersecting the plurality of first pen electrodes.