Optical biosignal sensors are in high demand. Heart rate/respiratory monitoring, blood pressure or blood oxygen and other physiological signal monitoring functions have become the new magic weapon for the new generation of wearable devices to enhance the value of products, which will stimulate the explosive growth of related optical biosensor shipments, thus attracting many chip vendors to compete. Product and technology layout.
Since the advent of the Apple Watch at the beginning of the year, the popularity of the wearable device market has soared. In particular, brand manufacturers have integrated heartbeat monitoring (HRM), respiratory/sleep detection, body fat, blood pressure and blood oxygen measurement signals (Vital Signs Monitoring) through smart watch built-in optical biosensors and applications. , VSM) function, further unveiled the development of "Wearing Device 2.0", which will promote the added value of smart bracelets/watches from sports and fitness-assisted applications, health care, and even medical -grade applications.
Looking at the VSM design requirements, first-line MEMS sensor chip makers are beginning to plan the optical biosensor product line; other chip vendors are also investing to master relevant technologies, such as Dialog to buy Dunhong 40% of the shares, Taiwan's Crystal Technology and Aisin Technology, etc., can see that the industry attaches great importance to the development of such sensors.
Wear and VSM applications, optical sensor design needs are booming
Analog Devices (ADI), Asia Pacific healthcare market manager Wang Sheng expressed, VSM will be leading the next wave of development of the core technology of wearable devices, may be wisdom watches, bracelets and other products for a long time to wear glasses to play to the characteristics of the human body To the fullest, it provides an intimate sensing experience that is unmatched by mobile phones. At present, VSM design can be divided into EMG, optical sensing, etc., while the latter is more cost-effective than the people, the module is more compact, and more optimistic can be accepted for wearable products, so the market demand is increasing day by day, attracting many chip card cards. Bit.
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Figure 1 Software and hardware design requirements for typical VSM functions
Wearable devices combined with the development of VSM are divided into three major stages. At present, most of the products are still in the first stage of “sports and fitnessâ€, and only the micro-electromechanical system (MEMS) motion sensor provides simple functions such as step counting. As for the second. And the third phase of "health care", "medical care" applications must be achieved through optical sensors and associated algorithms. Wang Sheng further pointed out that to make the wearable device meet the medical grade product specifications, accuracy and stability are absolutely key indicators, thus driving optical sensor, analog front end (AFE) and system design innovation.
Li Yongwen, general manager of Xindong Biotechnology, added that at this stage, the algorithm and optical structure have the most significant impact on the accuracy of VSM. Therefore, the company focuses on the development of VSM software calculus technology and has developed heart rate variability (HRV) and PRV (Pulse). Rate Variability algorithm provides more accurate and more valuable calculation data than existing HRM solutions. At the same time, ADI, Biosynthesis and Dynamic Technology also contribute to the knowledge of sensors/AFE components, algorithms and system design, respectively, and jointly develop a complete VSM software and hardware solution, which is expected to accelerate the wearer's health and medical care by sports and fitness. Care application.
In fact, chip vendors in other fields are also paying great attention to optical biosensor application opportunities, and are rushing into the market with different technology routes. Among them, the clock component business crystal technology has developed a quartz ceramic (Ceramic) packaging technology for MEMS optical sensing components, through the patented 3D stacking structure (Stacking Structure) to create a bottomless noise, small size proximity light and ambient light The Proximity & Ambient Light Sensor is expected to further meet the slim design requirements of the wearable device.
Quartz/MEMS technology co-op optical sensor size is halved
Lin Liqing, product application engineering manager of Taiwan's Crystal Technology Marketing Department, said that the proximity sensor has become a standard mobile phone, even with integrated gesture control, ambient light and color sensing, or with the trend of supporting algorithms to support VSM applications. System manufacturers are increasingly demanding component cost and volume. Aiming at this design trend, Crystal Technology pioneered the development of optical sensor modules using quartz ceramic packages, and realized a single-hole design through a special 3D stacked structure to replace the traditional Tx and Rx dual-hole solutions, and the size was mainstream from the industry 4020. The 4024 has dropped to a new milestone of 2520 (2.5mm × 2.0mm), and it can also greatly improve the problems of light leakage and refraction interference to achieve the purpose of no noise and low optical structure cost.
In fact, the sensing principle of quartz and MEMS components is similar. There are also many overlaps in packaging, measurement and production technology. The combination of two phases will exert the effect of one plus one and two, so that the optical sensor accuracy, The improvement in size and cost is more balanced.
Lin Liqing believes that the next stage, wearable device developers will be introduced into the optical sensor to achieve ultraviolet (UV) sensing, gesture operations, or with algorithms to support heart rate monitoring, breathing, blood pressure and blood oxygen Wait for the VSM function. In this regard, Crystal's small-sized optical sensor module made of quartz ceramic package will meet the above design requirements at one time, which will help the company to obtain a favorable position in the future optical sensor technology competition.
Obviously, the development of the wearable device is booming, and chip vendors are racing to expand the lineup of optical biosensor products. Algorithm developers and system operators are also actively preparing for the huge market application opportunities. With the emergence of the need to introduce VSM into the wearable device, the visibility of the optical sensor has suddenly increased, and it is expected to gradually extend from the mobile device power saving mechanism to the VSM application that can constantly monitor various physiological signal changes, so that the relevant supply chain The workers are exposed to rain and dew.
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