Although HoloLens is a well-deserved pioneer in the AR field, it still fails to solve the problem of narrow FOV (less than 40 degrees). This is equivalent to placing a 15-inch display in front of your eyes. The good news is that a patent exposed by Microsoft revealed that HoloLens will use a new imaging solution to more than double the viewing angle.
According to reports, techniques that can be used for near-eye display include waveguides, birdbath, light fields, and the like. Displays with different display technologies have different advantages and disadvantages. Among them, the waveguide and birdbath-based display devices have higher image sharpness, contrast, and resolution, but when superimposed with objects in the real world, they can only provide a narrow field of view (low occlusion effect) and weak or no The depth effect. Conversely, light field displays such as pinlight provide perceptible depth imaging and a wider field of view, but with much lower resolution, sharpness, and contrast.
HoloLens uses an optical waveguide display with sharp image and high resolution. The disadvantage is that the field of view is small. MagicLeap uses light field technology to provide a larger field of view, and imaging can completely cover objects in the real world, but the disadvantage is that the picture clarity is low. Now, Microsoft combines these two technical advantages by stacking these two displays.
In simple terms, one of the display systems is selected to render a virtual object according to the characteristics of the virtual object. For example, optical waveguide technology is used for the focus area in the center of the line of sight, and light field display technology is used for the peripheral area.
By integrating two technical advantages, HoloLens's viewing angle is expected to reach 80-90 degrees, while still ensuring the quality of graphic imaging. But there is no doubt that the cost of HoloLens will also rise.
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