Defining a microdisplay can be a little tricky - there are several definitions. Projection Microdisplays These tiny displays, sometimes called miniature flat panels, are the engines which create the images in two broad classes of devices.
Optics magnify and produce a real image that is projected and imaged upon a screen.
Front projection configurations utilize a distant wall or screen to view the magnified image. Rear projection configurations enclose the magnification optics in back of an imaging screen to produce a self-contained system. Microdisplays are already in use in front projection systems for business presentations where the device is connected to laptop computer. A user looks into a small viewfinder but sees an image that appears much larger and floating some distance from the viewer. The fact is, almost all electronic components are shrinking except the display.