Display glasses
Display glasses) are electronic glasses that have a built in display visible to the user when wearing them. The display appears to float in front of the user.
A benefit of display glasses is that they can be a portable display with a large field of view that can used with a computer in certain situations superiorly to a laptop, tablet, or external monitor.
Display glasses should have the periphery open. The center and lower center field of view can be totally blocked from the real world. Display glasses can be built using waveguides or reflectors.
Display glasses can connect to a video source, such as over HDMI or VGA. Display glasses can be single view or two view.
Display glasses are like smartglasses but without the computer. Display glasses do not have any 3D tracking capability.
HMD glasses can use a DLP pico projector. HMD glasses at a low level only have up to about 50 degrees field of view. They typically at least display a 2D image to at least one eye. The displays may have dimming over the entire display, or occlusion over only part of the display, so that the content has better contrast. The dimming often uses liquid crystal technology.
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Smartglasses use one or two pico projectors in the frame of the glasses.
They often use waveguides, which are a kind of optical combiner.
IPD adjustment may be necessary if using one display per eye to show a flat image.
A company that advertises occlusion for smartglasses is Cogni Trax.