Multi-Layer Sensor Stack for Touch and Pen Input Switching
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Solution Overview
Problem
Existing multimedia electronic devices lack efficient methods for sensing inputs from both touch and pen-based inputs, particularly for users accustomed to writing instruments, without increasing thickness, weight, or compromising flexibility.
Innovation Solution
An electronic device with a sensor layer comprising multiple conductive layers and electrodes arranged in intersecting directions, capable of switching between touch and pen input modes, utilizing a sensor driving unit to selectively operate in either mode, thereby enhancing input sensing capabilities without requiring a digitizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a digitizer is added to enable pen input sensing, then pen input capability is improved, but device thickness and weight increase
Solution Approach 1:
The sensor layer is designed to perform both touch input sensing and pen input sensing functions using the same conductive layers and electrodes. By configuring the first and second conductive layers with touch electrodes and the third and fourth conductive layers with pen electrodes, the system achieves multi-functionality without requiring a separate digitizer, thereby avoiding additional weight while maintaining pen input capability
Solution Approach 2:
The patent merges touch sensing and pen sensing capabilities into a single integrated sensor layer structure. The multiple conductive layers are combined to serve dual purposes: touch electrodes for finger touch detection and pen electrodes for stylus detection. This consolidation eliminates the need for separate digitizer components, thus preventing weight increase while enabling comprehensive input sensing
2Adaptability or versatility
If a digitizer is added to enable pen input sensing, then pen input capability is improved, but device thickness increases
Solution Approach 1:
The sensor layer is designed to perform both touch input sensing and pen input sensing functions using the same conductive layers and electrodes. By configuring the first and second conductive layers with touch electrodes and the third and fourth conductive layers with pen electrodes, the system achieves multi-functionality without requiring a separate digitizer, thereby avoiding additional thickness while maintaining pen input capability
Solution Approach 2:
The patent implements a nested structure where multiple conductive layers are stacked within the sensor layer thickness. The first through fourth conductive layers are arranged in sequence, with each layer containing specific electrode patterns. This nested arrangement allows both touch and pen sensing functionalities to be embedded within the existing sensor layer profile, preventing thickness increase while enabling comprehensive input detection
3Measurement precision
If separate touch and pen sensing systems are implemented, then sensing precision is improved, but device complexity increases
Solution Approach 1:
The sensor layer is segmented into multiple functional conductive layers, each with specific electrode patterns optimized for particular sensing modes. The first and second conductive layers contain touch electrodes for touch input detection, while the third and fourth conductive layers contain pen electrodes for pen input detection. This segmentation allows each layer to be optimized for its specific function, improving sensing precision while maintaining manageable structural complexity through modular organization
Solution Approach 2:
The sensor driving unit dynamically switches between different sensing modes (touch mode and pen mode) by selectively activating appropriate electrode pairs. This dynamic operation allows the system to optimize sensing parameters for the current input type, improving measurement precision. The dynamic configuration management keeps control logic organized and manageable, preventing excessive system complexity despite the multi-functional capability
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 seamless sensing of both touch and pen inputs without adding bulk or weight, maintaining device flexibility, and allowing for precise input recognition through induced currents and capacitance changes.
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
Implementation Method 2
a sensor driving unit that drives the sensor layer and is selectively operated in a first mode of sensing a touch input or a second mode of sensing a pen input
Data Source
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.