Sensor Layer Electrode Configuration for Capacitance Management
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Solution Overview
Problem
Current electronic devices face challenges in achieving sufficient sensing sensitivity for accurately recognizing user inputs, such as touch coordinates and active pen positions, due to limitations in electrode structure design which result in inadequate parasitic capacitance management.
Innovation Solution
The electronic device incorporates a sensor layer with a specific electrode and cross-electrode configuration, featuring alternating pattern portions and cross-pattern portions, optimized opening sizes, and bridge patterns to enhance mutual capacitance and reduce parasitic capacitance, thereby improving sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional electrode structure is used, then the device complexity is low, but the sensing sensitivity is insufficient
Solution Approach 1:
The electrode structure is segmented into multiple portions (first portions and second portions) with different opening sizes. The first portions have larger openings while the second portions have smaller openings, allowing different regions of the electrode to serve different functional purposes in capacitance management.
Solution Approach 2:
Different regions of the electrode are given different local properties through varying opening sizes. The first portions with larger openings are positioned to reduce parasitic capacitance in specific areas, while the second portions with smaller openings maintain structural integrity and provide alternative capacitance pathways.
2Object-generated harmful factors
If the electrode opening size is increased to reduce parasitic capacitance, then the parasitic capacitance decreases, but the mutual capacitance also decreases
Solution Approach 1:
The electrode is divided into segments with different opening sizes rather than using a uniform structure. This segmentation allows the electrode to simultaneously achieve low parasitic capacitance in certain regions while maintaining adequate mutual capacitance in other regions through the alternating pattern of first and second portions.
Solution Approach 2:
Different local regions of the electrode have different opening characteristics optimized for their specific functional requirements. The first portions with larger openings locally reduce parasitic capacitance, while the second portions with smaller openings locally maintain mutual capacitance, achieving both goals simultaneously across the electrode structure.
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 configuration increases the mutual capacitance between electrodes, leading to enhanced sensing sensitivity and accurate recognition of user inputs, even with low-performance driving chips, by maintaining parasitic capacitance within a set value, thus improving coordinate recognition accuracy.
Implementation Method 1
The electronic device may sense an external input applied from the outside of the electronic devices... The electronic devices may recognize coordinates of the pen using an electromagnetic resonance (EMR) method or may recognize the coordinates of the pen using an active electrostatic (AES) method
Implementation Method 2
This configuration increases the mutual capacitance between electrodes, leading to enhanced sensing sensitivity and accurate recognition of user inputs, even with low-performance driving chips, by maintaining parasitic capacitance within a set value
Data Source
AI summary
An electronic device includes a display layer and a sensor layer on the display layer. The sensor layer includes an electrode and a cross electrode. The electrode includes a plurality of first portions spaced from each other in a first direction and a plurality of second portions between the plurality of first portions. The cross electrode includes a plurality of first cross portions spaced from each other in a second direction crossing the first direction and a plurality of second cross portions between the plurality of first cross portions. The second portion includes a first pattern portion extending in the first direction and a plurality of second pattern portions extending in the second direction. A first opening is in the plurality of first portions, a second opening is in the first pattern portion, and a size of the first opening is greater than a size of the second opening.