Multilayer Sensor Electrode Routing for Pen Input Without Digitizers
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Solution Overview
Problem
Existing multimedia electronic devices lack efficient detection of pen input without increasing thickness, weight, or flexibility due to the need for a digitizer.
Innovation Solution
An electronic device with a sensor layer comprising specific electrode configurations and trace lines, including first and second electrodes, auxiliary electrodes, and trace lines, capable of detecting both touch and pen input without a digitizer, by utilizing coupling capacitors and trace lines on different layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional digitizer is used to detect pen input, then pen input detection capability is achieved, but device thickness and weight increase
Solution Approach 1:
The patent extracts the pen input detection function from the traditional digitizer layer and integrates it into the existing sensor layer by adding specific electrode configurations (third and fourth electrodes) and coupling capacitors. This allows pen input detection without the bulk of a separate digitizer layer, thereby reducing device weight while maintaining detection capability.
Solution Approach 2:
The patent merges the touch sensing function and pen input detection function into a single sensor layer structure. By combining the existing touch electrode array with additional electrodes and coupling capacitors, the system achieves both touch and pen input detection without requiring separate digitizer layers, thus reducing overall device weight.
2Measurement precision
If a traditional digitizer is used to detect pen input, then pen input detection capability is achieved, but device flexibility decreases
Solution Approach 1:
The patent extracts the rigid digitizer layer from the device structure and replaces it with a flexible sensor layer configuration that uses thin-film electrodes and coupling capacitors. This extracted approach maintains pen input detection capability while eliminating the rigidity associated with traditional digitizers, thereby preserving device flexibility.
Solution Approach 2:
The patent employs thin-film electrode structures and flexible substrate materials in the sensor layer to enable device flexibility. The thin-film coupling capacitors and electrode patterns are designed to conform to flexible substrates, allowing the device to bend and flex while maintaining pen input detection functionality.
3Reliability
If trace lines are extended to connect all electrodes, then electrical connection is achieved, but peripheral area increases
Solution Approach 1:
The patent uses multiple layers for trace line routing, extending trace lines in the thickness dimension rather than only in the planar dimension. This allows electrical connections to be made vertically through different layers, reducing the peripheral area required for horizontal trace line extensions while maintaining reliable electrical connections between electrodes.
Solution Approach 2:
The patent segments the trace line connections by using intermediate connection points and multi-layer routing. Instead of single long trace lines spanning the entire electrode array, the connection path is divided into multiple segments across different layers, reducing the peripheral area occupied by individual trace lines while maintaining overall electrical connectivity.
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 precise pen input detection without the bulk and rigidity issues associated with traditional digitizers, maintaining device slimness and flexibility.
Implementation Method 1
a first coupling capacitor being provided between the first electrode and the third electrode
Data Source
AI summary
An electronic device including: a display layer; and a sensor layer disposed on the display layer and including a sensing area and a peripheral area that is adjacent to the sensing area, wherein the sensor layer includes: first electrodes extending in a first direction and arranged in a second direction crossing the first direction; second electrodes extending in the second direction and arranged in the first direction; a third electrode extending in the first direction and electrically insulated from the first electrodes; a fourth electrode extending in the second direction and electrically insulated from the second electrodes; first trace lines electrically connected to the first electrodes, respectively, wherein the plurality of first trace lines overlap the peripheral area; and a sub trace line electrically connected to a portion of the first trace lines and overlapping the sensing area.