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Driven by Apple and other smartwatch suppliers, demand for infrared optical components expected to grow stronger: TrendForce

The Eye on Taiwan news staff

Demand for infrared optical components is expected to grow stronger in 2018, driven by the pressing needs of Apple and other smartwatch or wristband suppliers to increase the accuracy of pulse oximeter heart rate sensors in their new-generation watch products, Taiwan’s tech research agency TrendForce said.

Citing LEDinside’s 2018 Infrared Sensing Application Market report, TrendForce said in a press statement Monday that pulse oximeter heart rate sensors have been widely introduced into smartwatch and wristband markets, pushing the demand for infrared optical components.

“Apple is expected to increase the accuracy of pulse oximeter heart rate sensors in its new-generation Apple Watch, thus may double the demand of green LEDs and infrared LEDs used in the products,” it said.

The amount of photodiode needed for the new products may be four to five times more than in previous models, and the photodiode will also be larger in size, TrendForce said.

Photoplethysmography has many advantages, such as small size, low power consumption, rapid response, etc., and has thus been gradually introduced into applications like fitness trackers, home care equipment, and automotive monitoring devices, says Joanne Wu, research manager of LEDinside.

However, some consumers still question the reliability of devices, so the manufacturers are committed to improving the accuracy of sensors in order to gain consumer confidence, she noted.

Photoplethysmography require high linearity, high sensitivity, and good signal-to-noise ratio. The products incorporate emitter and receiver. The emitter needs to match the requirements of algorithm programs, so the wavelength of the LED products varies from brand to brand.

The common design uses green LED paired with infrared LED to detect the amount of blood flowing through your wrist at any given moment and to count the heartbeats, according to TrendForce.

If pairing red LED with infrared LED, the sensor can detect the amount of deoxygenated hemoglobin (Hb) and oxygenated hemoglobin (HbO2) during any given time to calculate the oxygen saturation levels. The main suppliers of infrared LED include OSRAM OS and Epistar, it said.

On the other hand, receivers mostly use photodiodes, especially large-area photodiode with low dark current, which has a short response time and can receive LED energy completely.

The next generation of Apple Watch is also expected to use larger-sized photodiodes, and the number of photodiodes used maybe four to five times more than previous models. The current major supplier of photodiodes is Opto Tech, TrendForce said.

IDC Wearables forecast
Graph captured from IDC website

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