Patent ID: 8077376

Claim:
A display system comprising: a light guidance substrate; a plurality of pixels each operable for emitting light in a pre-selected manner; and a plurality of sources for the light optically coupled to the light guidance substrate, light from the sources propagating through the light guidance substrate by total internal reflection, the sources comprising: a source of visible light; and a source of non-visible light, wherein when the visible light is emitted from the plurality of pixels, the display system is configured to display a visible light image, and wherein when the non-visible light is emitted from the plurality of pixels, the display system is configured to display a non-visible light image; and wherein the source of visible light operates in a selected manner interchangeably with the source of non-visible light to display the visible light image for a first period of time and to display the non-visible light image for a second period of time.