Sensor Layer Electrode Layout for Touch and Pen Input Precision
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Solution Overview
Problem
Existing multimedia electronic devices face challenges in efficiently sensing both touch and pen inputs without increasing thickness, weight, or compromising flexibility due to the inclusion of a digitizer.
Innovation Solution
The electronic device incorporates a sensor layer with a specific electrode configuration, including first, second, and third electrodes arranged in alternating directions, and a lower conductive layer with fourth electrodes, capable of sensing touch and pen inputs through distinct modes, eliminating the need for a digitizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate digitizer is added to enable precise pen input sensing, then pen input precision is improved, but device thickness and weight increase
Solution Approach 1:
The patent merges the touch sensing function and pen sensing function into a single sensor layer by integrating multiple electrode types (first electrodes, second electrodes, third electrodes) and a lower conductive layer with fourth electrodes. This combined electrode system simultaneously detects both finger touches and pen inputs, eliminating the need for a separate digitizer layer while maintaining precise pen input detection capability
Solution Approach 2:
The sensor layer is designed with multi-functional electrodes that can detect both capacitive touch inputs from fingers and electromagnetic resonance signals from pens. The first, second, third, and fourth electrodes work together to provide universal sensing capability for both input types, allowing the same layer to serve multiple sensing purposes without requiring additional specialized components
2Measurement precision
If a separate digitizer is added to enable precise pen input sensing, then pen input precision is improved, but device thickness increases
Solution Approach 1:
The patent merges the touch sensing function and pen sensing function into a single sensor layer by integrating multiple electrode types (first electrodes, second electrodes, third electrodes) and a lower conductive layer with fourth electrodes. This combined electrode system simultaneously detects both finger touches and pen inputs, eliminating the need for a separate digitizer layer while maintaining precise pen input detection capability
Solution Approach 2:
The patent utilizes the vertical dimension by placing electrodes on both sides of the display layer - third electrodes on the sensor layer and fourth electrodes on the lower conductive layer. This multi-layer electrode arrangement in the vertical dimension enables precise pen sensing without requiring additional horizontal thickness, as the sensing capability is achieved through the stacked electrode configuration rather than lateral expansion
3Adaptability or versatility
If multiple electrode types are integrated in a single sensor layer for both touch and pen sensing, then sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the sensing function into distinct electrode groups with specific roles: first electrodes and second electrodes for touch sensing, third electrodes for pen sensing on the sensor layer, and fourth electrodes on the lower conductive layer. Each electrode type is strategically positioned and configured to optimize its specific sensing function, allowing complex multi-modal sensing to be achieved through organized segmentation rather than a monolithic complex structure
Solution Approach 2:
Different regions of the sensor layer are assigned different electrode configurations optimized for their specific sensing needs. The first, second, third, and fourth electrodes are distributed with specific arrangements and densities in different areas to locally optimize for either touch sensitivity or pen detection accuracy, allowing the overall system to handle multiple sensing types without requiring uniform complexity throughout the entire layer
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 touch and pen inputs without increasing device thickness or weight, maintaining flexibility, and enhancing input precision and intuitiveness.
Implementation Method 1
The sensor layer may sense the user's touch or pressure
Implementation Method 2
other such displays are specially designed to also be able to register a more precise touch of a stylus/pen device
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An electronic device includes a display layer, a sensor layer disposed over the display layer, and a lower conductive layer disposed under the display layer. The sensor layer includes a plurality of first electrodes that are arranged in a first direction and extend in a second direction crossing the first direction. A plurality of second electrodes are arranged in the second direction and extend in the first direction. A plurality of third electrodes are arranged in the first direction and extend in the second direction and have first ends that are connected together. The lower conductive layer includes a plurality of fourth electrodes that are arranged in the second direction and extend in the first direction and have first ends that are connected together.