Popular Science: Virtual reality head display and sensor principle

Virtual reality headset is currently the most popular digital device, Oculus Rift is available, HTC Vive will be shipped soon, Sony PlaystaTIon VR will be officially released in the summer, both PC and game console users can experience the impact of virtual reality games . Of course, smartphones can also implement entry-level virtual reality experiences through peripherals, such as Google Cardboard Glasses, Samsung GearVR, and more.

Although the virtual reality headset is the next consumer electronics hotspot, you may not know much about its complex hardware architecture and operating principles. Today, let's take a look at what secrets are hidden in the virtual reality headset.

Basic technical characteristics

First of all, it is certain that the virtual reality headset is a display, a head-mounted display, which is not itself a portable computer capable of running a certain system independently. A typical example is Microsoft's augmented reality glasses HoloLens, many friends will confuse it with the head-mounted display; but in fact, it is not a display, but a complete computer hardware, built-in processor, RAM, graphics card, independent Running the app, the Oculus Rifts can't.

The main purchases of most virtual reality head-mounted displays are very similar. First, two lenses and lenses are required to set up the OLED screen. The two are used together to achieve an immersive 3D picture. Among them, desktop products (Oculus Rift, HTC Vive and Sony PlaystaTIon VR) have built-in screens, which need to be connected to the host (PC, PS4) via HDMI; while Samsung Gear VR and other mobile phones have only lenses, which need to be used as a screen. And the host to achieve display and run the application.

As far as visual effects are concerned, the lens can be used to achieve an immersive experience by achieving a field of view of 100 degrees or 110 degrees. 360 degree vision? Temporarily unnecessary. In addition, the 60fps frame rate is the entry standard for virtual reality headsets, in order to avoid problems such as stuns and dizziness.

Head tracking

In order to simulate the natural perspective conversion effect of human beings, the virtual reality headsets have built-in head motion tracking function, namely 6-axis tracking, which can realize X, Y, Z axis and front and rear side tracking. In addition, the headsets also include details such as gyroscopes, accelerometers and magnetometers to simulate the speed of rotation. We can see some LEDs or laser sensors on the Oculus Rift, HTC Vive and Sony PlaystaTIon VR to reduce signal delay. .

Motion tracking

In terms of motion tracking, it is basically achieved through accessories. After all, the virtual reality display is just a head-mounted display. In this regard, each company's implementation is slightly different.

Among them, the Oculus Rift needs to be controlled by the touch handle, and a large number of sensors are built in the handle to monitor the movement of the hand for specific operations. Sony PlaystaTIon VR uses the PS Camera and Move handles to achieve motion tracking operations, which is relatively lagging behind. After all, this solution already exists. HTC Vive's motion tracking function is the most comprehensive. By setting two laser tracking lenses in the room to scan the laser sensor on the headset and the handle, the scene tracking effect can be realized.

Eye tracking

In addition to the mainstream head, motion tracking, and some manufacturers to find a way to bring a cooler, more realistic virtual reality experience, FOVE is an example, it can achieve eye tracking. Specifically, it is to track the movement of the eye by adding an infrared tracking sensor to the head-mounted display, which means that the user can move the angle of view without turning his head, which is more in line with the feeling of real life.

In addition, FOVE's eye tracking can also achieve a depth of field experience, simply like your eyes can zoom (see the vision close-up blur, and vice versa), this feeling is undoubtedly more realistic, for the virtual reality technology to enhance the sense of presence Great significance.

summary

Virtual reality technology is still in the development stage, and the current first generation products still have huge room for improvement. In the future, head-mounted displays will be lighter and more realistic, and the wearable full-body motion tracking system is also a part that is worth looking forward to. Beyond reality, it may be the ultimate goal of virtual reality technology.

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