In this blog post, we’ll explore the principles and core technologies behind wearable electronic systems that can be attached to the skin, as well as why this technology is gaining attention as the next-generation electronic device platform in the era of AI-based digital healthcare.

Why Wearable Electronic Systems Are Gaining Attention

Personalized information services, once considered mere fantasy in movies, are now becoming a reality. Smartwatches measure a user’s heart rate and physical activity in real time, while smart glasses provide various types of information using voice commands and augmented reality technology. Furthermore, thanks to advances in AI technology, the data collected is being used not only for simple recording but also to analyze health status and predict future health risks.
Today, wearable technology is evolving beyond simply wearing electronic devices on the body toward naturally integrating with the user’s physique. While devices such as smartwatches, smart rings, and smart glasses are already widely adopted, researchers are looking to skin-adhesive electronic systems—which adhere to the skin almost as if they were part of it—as the ultimate form of wearable technology.
Wearable electronic systems attached directly to the skin can continuously measure various biosignals without hindering the user’s movements. These features are recognized as core foundational technologies for digital healthcare, telemedicine, and personalized medical services, and their scope of application is rapidly expanding in actual medical settings.

Advantages and Potential Applications of Skin-Attachable Wearables

Since skin-attachable wearable electronic systems measure biosignals directly while in close contact with the skin, they can provide more accurate and stable data than conventional wrist-worn devices. They can continuously measure various parameters—such as body temperature, heart rate, electrocardiogram (ECG), blood pressure, muscle activity, and sweat composition—and offer the advantage of minimal discomfort even during prolonged wear.
Recently, technology for real-time health monitoring using skin-adhesive biosensors has been advancing rapidly. For example, continuous glucose monitors (CGMs) help people with diabetes continuously track blood glucose levels while reducing the burden of repeated blood draws, and medical smart patches are being used to monitor ECG and respiratory status.
These technologies enable continuous monitoring of patients’ conditions even outside of hospitals, helping to detect emergencies early and manage chronic diseases efficiently. Furthermore, when combined with AI analysis technology, they can detect early signs of disease and provide personalized healthcare services.
Recently, digital healthcare services have expanded beyond simple monitoring to predict potential disease progression or analyze individual health patterns, and wearable devices have established themselves as the core data collection tools for these services.

The Characteristics of Skin and the Need for Stretchable Electronics

To develop skin-adhering wearables, the unique physical characteristics of human skin must be taken into account. The skin does not simply move in one direction; it stretches, contracts, and bends in various directions. Even with everyday movements, the skin undergoes repeated and significant deformation.
Conventional flexible electronic devices can bend but cannot stretch freely. In contrast, electronic systems that adhere closely to the skin must be able to stretch and contract in response to the skin’s movements. Electronic devices with these characteristics are called “stretchable” electronic devices.
The problem is that most semiconductor materials are inherently rigid and do not stretch well. Therefore, to create skin-adhering electronic devices, it is necessary to either change the materials themselves or innovatively redesign the structure.
Since human skin can undergo deformation of 10–30% or more depending on the area, electronic devices must also operate stably while withstanding this repeated deformation. For this reason, ensuring both flexibility and durability is considered a key challenge in the development of stretchable electronics.

Core Technologies of Stretchable Electronics

Currently, the most widely researched approach involves modifying the structure to achieve flexibility and stretchability while maintaining the excellent performance of existing semiconductor materials.
The first method involves fabricating semiconductors as extremely thin nanometer-scale films. Since thin films experience significantly reduced stress when bent, they can operate stably even under repeated deformation.
The second method involves designing the wiring that transmits electrical signals in a serpentine structure. This approach involves fabricating the connecting wires in a winding, wave-like pattern so that they can stretch like springs. When the skin stretches, the wiring stretches along with it, absorbing the deformation and thereby reducing the strain placed on the electronic components.
Recently, research into next-generation materials such as conductive polymers, graphene, carbon nanotubes, and liquid metals has been actively underway. In particular, composite materials made from liquid metals and conductive polymers are attracting attention as materials for next-generation wearable electronic devices because they can simultaneously achieve high elasticity and electrical conductivity.
Research is also underway on electronic materials with self-healing capabilities. These materials have the ability to repair themselves even when minor damage occurs, and are expected to significantly improve the durability of future wearable electronic devices.

Composition and Applications of Skin-Attachable Systems

Skin-attachable wearable electronic systems generally consist of a power supply, various biosensors, a data processing unit, and a wireless communication module.
Sensors measure the user’s biometric information, and the measured data is transmitted to a smartphone or cloud server. AI algorithms then analyze the data to assess health status or detect abnormal signs.
Recently, products in the form of smart patches applied to the skin have been utilized in actual medical settings and are being applied in various fields, such as ECG measurement, sleep analysis, exercise performance evaluation, and stress management.
Data collected from wearable devices is also used to assist medical professionals in making diagnoses and has established itself as a core element of remote patient monitoring (RPM) systems. In particular, in an aging society, these devices are attracting significant interest because they allow for continuous monitoring of health status without the need for hospital visits.
In the future, these devices are likely to evolve beyond simply measuring information to include smart patches combined with drug delivery systems, nerve stimulation devices, and rehabilitation equipment. Furthermore, there are expectations for the development of closed-loop medical systems that automatically support treatment based on results analyzed by artificial intelligence.

Conclusion: The Future of Wearable Electronic Systems

Advances in AI and biosensor technology are significantly expanding the role of wearable electronic systems. Whereas wearable devices of the past were merely information-providing devices, today’s wearable electronic systems are evolving into intelligent platforms that analyze users’ health status in real time, predict disease risks, and support health management.
In particular, stretchable electronic devices that attach directly to the skin are establishing themselves as core technologies in digital healthcare, thanks to their high accuracy and excellent comfort. As materials technology, artificial intelligence, and wireless communication technologies continue to advance, wearable electronic systems will play an increasingly vital role in various fields, including medicine, healthcare, sports, and rehabilitation therapy.
Ultimately, wearable electronic systems are expected to become the core infrastructure of an era of personalized medicine, enabling real-time understanding and management of human health. As we approach an era where the human body and electronic devices are naturally interconnected, the importance of wearable electronic systems will only grow.