MEMS devices, especially MEMS sensors, have become standard in smart phones. Best-selling models such as the Apple iPhone and Research in MoTIon (RIM)'s Blackberry Storm, as well as Samsung's Omnia, HTC's Diamond, and Nokia's N95 and N96, all use inertial sensors.
At the same time, the growing ecosystem of smartphone apps is largely due to MEMS sensors. In fact, due to the ever-evolving Internet access and sensor technology of smartphones, smartphones are quickly becoming the largest wireless sensor network on the planet.
The sensors, actuators, and optical devices fabricated using MEMS technology in smartphones are mainly as follows, as shown in Figure 1.
Figure 1 MEMS devices in smart phones
Accelerometers, gyroscopes, and electronic compasses: Inertial Measurement Units (IMUs) enable indoor navigation.
The accelerometer can also perform free fall detection, tilt control, pedometer, gesture detection, single-click/double-click detection, and screen flipping.
Gyro can also achieve image stabilization, augmented reality and other functions.
Pressure Sensors: Provides accurate height data for multi-storey buildings and shopping malls to advance LBS services.
Silicon micro-microphones: Compared to conventional condenser microphones, silicon micro-microphones can be manufactured with a surface-mount process, can withstand high reflow temperatures, easily integrate with CMOS processes and other audio circuits, and have improved noise cancellation performance. With good RF and EMI suppression performance.
MEMS Micromirrors: Microprojectors.
CMOS image sensor, autofocus actuator: camera/camera.
Ambient light sensor: The application advantage is to help the mobile phone save the display power consumption and increase the working time of the battery. The latest light sensors include more features such as spectral response and dynamic range, integrated proximity detection, and digital communications.
Proximity sensors, microdisplays: Displays with touch sensitivity.
MEMS oscillators, RF switches: cellular radio modules.
Figure 2 shows the development of the MEMS sensor market: pressure sensors, accelerometers, and gyroscopes have entered a period of maturity. Microphones and electronic compasses are still in development, and other sensors are still in their infancy.
Figure 2 MEMS device market development stage
In the wave of mobile phone market attacks on the accelerometer and gyroscope, the electronic compass began to exert force. The electronic compass does not need to receive satellite signals. It complements the GPS indication direction function. Figure 3 shows the development of the electronic compass in the mobile phone market.
In 2004-2007, a mobile phone with an integrated electronic compass appeared on the Japanese electronics market, providing navigation services for the first time in Japan.
In 2009, Nokia N97 and Apple iPhone 3GS integrated electronic compass.
From 2010 to 2011, the market's expected LBS service will push the electronic compass into the mainstream market. In 2010, the major brands of smartphones introduced electronic compasses (magnetic sensors).
Figure 3 The development of the electronic compass in the mobile phone market
The mobile phone market is changing very fast. It now appears that 2010 is a turning point in the use of MEMS sensors in mobile phones: The MEMS sensor handset market is experiencing double-digit growth, and sales are expected to reach US$7.91 billion by 2015.
There are several reasons why the MEMS sensor market is growing rapidly:
1. The market share of smart phones is rising rapidly: In 2015, 44% of mobile phones will be smart phones. The advantage of smartphones is the use of leading MEMS sensor technology to provide customers with new features/services and improved handset performance.
2. The integrated GPS function is not limited to high-end mobile phones. In 2010, GPS functionality was integrated in nearly one-third of mobile phones. This is another driving factor for integrated motion sensors: When GPS combines electronic compasses, accelerometers and gyroscopes, new services such as LBS services will be born. It is estimated that in 2015, the mobile sensor mobile phone market will reach 1.19 billion U.S. dollars. From 2009 to 2015, the CAGR was 25.3%, as shown in Figure 4.
Figure 4 2009-2015 MEMS sensor handset market
Figure 5 shows the five different motion sensing functions implemented in the cell phone. It can be seen from the figure that as the complexity of the motion increases, the added value also increases.
Figure 5 5 different motion sensing functions implemented in the mobile phone
3. Currently, as more and more multi-band and multi-mode mobile phones emerge, their RF parts change very quickly. The newly introduced standards (especially LTE networks) directly affect RF components and will use more sensors to open new doors for online services.
Summarize the current market: MEMS technology to see consumer electronics, consumer electronics to see smart phones, smart phones to see Apple phones, Apple phones to see Jobs, Jobs to see God (cancer conditions).
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