What is the Use of Sensors in Mobile Phones?

The sensors in mobile phones are very powerful and diverse. Using data collected by sensors and then calculated and analyzed by program software, mobile phones provide a more convenient way for us to socialize, live, and entertain. So what exactly are these sensors? What functions do they achieve? In what scenarios they are applied?

Common Types of Sensors in Smartphones

Mobile phones usually have an accelerometer, which can detect the acceleration and change rate of the device. Common usage scenarios include:

1) Automatic rotation of the screen direction: The accelerometer can detect the tilt angle and direction of the device, thereby realizing the function of automatic rotation of the screen direction. For example, when a user flips the phone sideways, it can detect this movement and automatically rotate the screen orientation to landscape display mode.

2) Step counting and health monitoring: The accelerometer can detect the acceleration and vibration of the device, thereby calculating the number of steps and exercise intensity of the user.

3) Game control: The accelerometer can detect the tilt and rotation of the device, thereby realizing the control functions of many mobile games. For example, tilt the device to control the movement of the character or control the direction of the aircraft, etc.

4) Shake detection: The accelerometer can detect the shake and vibration of the device, thus realizing the shake detection function. For example, when taking photos or recording videos, this sensor can be used to trigger the image stabilization function to make the photos or videos taken more stable and clear.

GPS and position sensors enable smartphones to provide location-based services such as maps, weather, and local search. And they also enable navigation and location tracking.

Biometric sensors such as fingerprint scanners and facial recognition sensors are used for secure authentication and mobile payments, where they enable users to unlock their phones and make purchases without entering a password or PIN.

Generally, gaming phones, or mid-to-high-end phones, will have gyroscopes. It is a sensor used to measure the angular velocity and angular displacement of equipment. Common usage scenarios include:

1) Direction sensing: The gyroscope can sense the rotation and tilt of the mobile phone, and calculate the rotation angle and direction of the device by measuring the angular velocity and angular displacement of the device, thereby realizing the function of direction sensing.

2) Game control: Many mobile games require tilting the phone to control the movement of the character, gyroscope also can help achieve this function by measuring the angular velocity and angular displacement of the device to control the movement of the character in the game. For example, in Need for Speed, you can control the direction of the vehicle by shaking your phone; In Battle Royale, you can control the position of the sight by shaking your phone.

3) Shooting stability: Gyroscope sensors can help mobile phone cameras achieve image stabilization. They calculate the rotation angle and direction of the camera by measuring the angular velocity and angular displacement of the device, and use this information to stabilize the image, thereby reducing shooting jitter and blur.

Magnetometers can measure the strength and direction of the surrounding magnetic field. Common usage scenarios include:

1) Compass function: The magnetometer can detect the direction and intensity of the earth's magnetic field, thereby realizing the compass function of the mobile phone. For example, when a user is using a map app, it can detect the direction and strength of the Earth's magnetic field and indicate the user's current direction.

2) Direction sensing: The magnetometer can detect the direction of the device, thereby realizing the function of direction sensing. For example, in navigation applications, it can detect the orientation of the device to provide navigation instructions and directional prompts. When using the mobile phone map, the direction of the arrow displayed when the mobile phone is horizontal will rotate with the direction of the mobile phone.

3) Camera auxiliary function: The magnetometer can be used for the auxiliary function of the camera. For example, when taking photos, the magnetometer sensor can detect the orientation and tilt angle of the device, thereby helping to automatically adjust the camera's parameters such as exposure and white balance to make the photos clearer and more realistic.

The light sensor can detect the surrounding light intensity and automatically adjust the screen brightness based on the detection results. It can also adjust camera exposure, control automatic screen rotation, adjust ambient lighting, and more.

Sometimes when you play games outdoors under strong light or lying in bed with your phone facing the light, the screen brightness is very dim, this is caused by the uneven distribution of the light sensors.

The proximity sensor is used to detect the distance between the device and the object, and can automatically turn off the screen and adjust the earpiece volume. Common usage scenarios include:

1) Automatically adjust or turn off the screen: When the user brings the phone close to the ear, the proximity sensor will detect the distance of the object and automatically adjust the screen brightness or automatically turn off the screen to save battery power and avoid eye irritation from an overly bright screen or accidentally touch the screen during a call.

2) Detection of objects near the mobile phone: Proximity sensors can also be used to detect whether there are other objects near the mobile phone. For example, when the phone is in a pocket or bag, it can detect the distance of an object to avoid accidental screen touches.

Temperature sensors are used to measure and monitor the temperature of equipment. Common usage scenarios include:

1) Prevent overheating: When the phone overheats, the temperature sensor can detect it and send a warning message so that the user can take measures to reduce the temperature of the device. For example, you can pause applications that take up more resources, place your phone in a well-ventilated place, blow it with an electric fan, or get a cooling back clip to avoid overheating and damage to the device.

2) Control charging: The temperature sensor can also be used to control the charging status of the device. When the device overheats, the temperature sensor can slow down the charging speed or stop charging to avoid damage or danger to the device.

3) Save battery power: Temperature sensors can also save battery power by controlling the power and performance of the device. On the one hand, when the device temperature is low, the temperature sensor can appropriately increase the power and performance of the device to improve the response speed and performance of the device, on the other hand, when the device temperature is high, it can appropriately slow down the power and performance of the device to avoid overheating damage to the device and save battery power.

Humidity sensors are mainly used to measure the humidity of the environment. In addition, common usage scenarios include:

3) Optimize energy utilization: Humidity sensors can save energy by controlling the power and performance of smartphones. On the one hand, when the humidity around the device is low, it can appropriately increase the power and performance of the device to improve the response speed and performance of the device, on the other hand, when the humidity around the device is high, it can appropriately slow down the power and performance of the device to avoid overheating damage to the device and save energy.

Barometers are mainly used to measure atmospheric pressure. In addition, common usage scenarios include:

1) Measuring altitude: The barometer can measure the air pressure of the surrounding environment to calculate the altitude of the current location. This is very useful in navigation and positioning, helping smartphones locate the user's location and provide corresponding navigation information.

2) Improve experience: The barometer can also be used to improve users’ experience. For example, when the user touch the screen, it can detect the user's finger pressure and automatically adjust the response speed and sensitivity of the touch screen to provide a better touch experience.

3) Environmental monitoring: The barometer can also be used to monitor the atmospheric pressure of the surrounding environment. This is very useful for meteorologists and weather enthusiasts as it provides real-time information about weather changes.

A flicker is a sensor that can detect the flicker frequency of a light source.

When indoors or in a low-light environment, the light will flash at a fixed frequency, such as 60Hz or 50Hz. If the exposure time of the camera is not synchronized with the flashing frequency of the light, it will cause problems such as flickering or streaks in the photos or videos taken. To solve this problem, flickers were introduced into smartphones. In addition, improves shooting in low-light conditions, delivering clearer and more stable photos and videos.

Common Mobile Image Sensor Model Lists

The mobile image sensor is a semiconductor component that converts optical signals into electrical signals. It is the core part of the phone camera module and determines the performance of the mobile phone in terms of resolution, color, dynamic range, noise, and focus. There are two types of image sensors: CCD Sensors (Charge-Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) Sensors. CMOS image sensors have outperformed CCD image sensors and occupied a large number of markets in terms of volume of shipment since 2004. Here are some mainstream mobile phone image sensors.

The models below are arranged from the sensor size (large to small). Please inquire about each parameter before selecting a final product (there will be slight differences).

Brand	Model	Pixels (ten thousand)	Pixel Size (μm)	Sensor Size (inch)	Aperture
Sony	Exmor Rs	1200	2.4	1	F/2.4
Sony	IMX989	5000	1.6	1	F/1.8
Samsung	GN2	5000	1.4	1/1.12	F/1.95
Samsung	HP1	20000	0.64	1/1.22	F/1.7
Sony	IMX700	5000	1.22	1/1.28	F/1.8
Sony	IMX701	5000	1.22	1/1.28	F/1.9
Sony	IMX803	4800	1.22	1/1.3	F/1.78
Samsung	GNV/GN1	5000	1.2	1/1.31	F/1.57
Omnivision (OV)	OV48C	4800	1.2	1/1.32	F/1.7
Omnivision (OV)	OV64A	6400	1	1/1.32	*
Samsung	HM3	10800	0.8	1/1.33	F/1.8
Samsung	HM1	10800	0.8	1/1.33	F/1.8
Samsung	HMX	10800	0.8	1/1.33	F/1.8
Sony	IMX789	4800	1.12	1/1.35	F/1.8
Sony	IMX689	4800	1.12	1/1.43	F/1.7
Sony	IMX866	5400	1	1/1.49	F/1.75
Sony	IMX800	5400	1	1/1.49	F/1.9
Sony	IMX890	5000	1	1/1.56	F/1.8
Sony	IMX766	5000	1	1/1.56	F/1.8
Samsung	GN5/GN3	5000	0.64	1/1.57	F/1.88
Samsung	HM2	10800	0.7	1/1.52	F/1.9
Sony	IMX703	1200	1.9	1/1.67-1/1.65	F/1.5
Sony	IMX787	6400	0.8	1/1.7	F/1.6
Sony	IMX686	6400	0.8	1/1.7	F/1.89
Sony	IMX682	6400	0.8	1/1.73	F/1.8
Sony	IMX600y	4000	0.8	1/1.73	F/1.6
Sony	IMX600	4000	0.8	1/1.73	*
Sony	IMX555	1220	1.8	1/1.76	F/1.8
Sony	IMX557	1220	1.8	1/1.76	F/1.7
Sony	IMX603	1200	1.7	1/1.88	F/1.6
Sony	IMX598	4800	0.8	'1/2	F/1.79
Sony	IMX586	4800	0.8	'1/2	F/1.75
Sony	IMX582	4800	0.8	'1/2	F/1.75
Sony	IMX581	4800	0.8	'1/2	F/1.7
Sony	IMX709	3200	0.8	1/2.74	F/2.4