Touch Sensing Unit With Stem Sensors And Depressions
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Solution Overview
Problem
Current touch sensing units in display devices face challenges in effectively sensing touch inputs due to limitations in capacitance measurement and noise interference, which affect the accuracy and reliability of touch detection.
Innovation Solution
The proposed touch sensing unit incorporates a multi-layer structure with intersecting first and second sensing electrodes, including stem sensors and depressions, along with dummy electrodes and ground patterns, to enhance capacitance measurement and reduce noise interference, thereby improving touch input detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch sensing units are used, then the device structure remains simple, but touch detection accuracy is insufficient due to noise interference and limited capacitance measurement capability
Solution Approach 1:
The sensing unit is divided into multiple first sensing electrodes and multiple second sensing electrodes that intersect with each other. Each electrode is further segmented into sensor portions and connection portions. This segmentation increases the number of sensing points and improves touch detection accuracy by providing multiple measurement locations while maintaining a manageable structural complexity through modular design.
Solution Approach 2:
Stem sensors are extended from the second sensor portions and are at least partially surrounded by respective depressions of the first sensor portions. This nested configuration allows the stem sensors to be positioned within the depression regions, maximizing the mutual capacitance measurement area without significantly increasing the overall footprint or structural complexity of the sensing unit.
2Measurement precision
If intersecting sensing electrodes with stem sensors and depressions are implemented, then mutual capacitance and touch detection accuracy are enhanced, but noise interference and parasitic capacitance increase
Solution Approach 1:
Ground electrodes are disposed between the first sensing electrodes and the second sensing electrodes to act as an intermediary shielding layer. These ground electrodes are insulated from both the first and second sensing electrodes, creating an electric field barrier that reduces noise interference and parasitic capacitance between the intersecting sensing electrodes, thereby improving capacitance measurement accuracy.
Solution Approach 2:
Depressions are formed in the first sensor portions at specific locations where stem sensors will be positioned. This local structural modification concentrates the electric field in specific regions, enhancing the mutual capacitance measurement at the touch detection points while the ground electrodes provide localized noise shielding where it is most needed, between the intersecting electrode pairs.
3Reliability
If multiple ground electrodes are added between sensing electrodes, then noise interference is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The ground electrodes serve multiple functions simultaneously: they act as shielding elements to reduce noise interference between intersecting sensing electrodes, provide a reference potential for capacitance measurement, and help define the sensing regions through their placement between electrode pairs. This multi-functionality improves touch sensing reliability without proportionally increasing manufacturing complexity, as the same fabrication processes can be used for both sensing and ground electrodes.
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 sensing electrodes, enhances touch input detection accuracy, and reduces noise interference, leading to improved sensitivity and reliability in touch sensing applications.
Implementation Method 1
sensing a touch input on the touch screen, based on a change in a mutual capacitance between the plurality of first sensing electrodes and the plurality of second sensing electrodes
Implementation Method 2
Each of the plurality of first sensor portions includes a plurality of depressions indented inwardly. Each of the plurality of stem sensors is disposed such that it is at least partially surrounded by a respective depression of the plurality of depressions
Implementation Method 3
A plurality of ground electrodes disposed in the display area, connected to the ground line, and disposed between the plurality of first sensing electrodes and the plurality of second sensing electrodes
Data Source
AI summary
A touch sensing unit, includes a plurality of first sensing electrodes and a plurality of second sensing electrodes intersecting with and insulated from the plurality of first sensing electrodes. The plurality of first sensing electrodes includes a plurality of first sensor portions and a plurality of first connection portions connecting each of the plurality of first sensor portions with one another. The plurality of second sensing electrodes includes a plurality of second sensor portions, a plurality of stem sensors extended from the plurality of second sensor portions, and a plurality of second connection portions connecting each of the plurality of sensor portions with one another. Each of the plurality of first sensor portions includes a plurality of depressions indented inwardly. Each of the plurality of stem sensors is disposed such that it is at least partially surrounded by a respective depression of the plurality of depressions.