A device, such as a heads up display, includes equipment for generating a virtual
image in the field of view of an observer. The equipment includes at least one
light source having a wavelength range less than 2 nm. The light source can be
a low pressure gas discharge lamp. The device also includes a holographic optical
element that provides a virtual image. The device also includes an image source,
such as a mask or an LCD. In one embodiment the holographic optical element combines
an image on a display with an ambient image. The holographic element provides multiple
colors undistorted in a virtual image appearing to the observer as converging from
the same distance.
