The Virtual Boy employs an extremely creative way of producing its unique binocular (and 3D) graphics.

A one-pixel-tall row of LEDs at the far end of each display unit projects light through a lens in the middle of each unit.

After passing through the lens, light is reflected off a mirror situated at 45^o that oscillates about its central axis.

The mirror oscillates and the LED refreshes with such speed that the human eye perceives a single image across the view plane.