Patent ID: 7348530

Claim:
An apparatus, comprising: a light source; an optical element having an optical surface; a reflective non-light-transmissive material having an upper first surface and a lower second surface, the first surface being reflective and disposed over at least portions of the optical surface, the reflective material having at least one aperture disposed therein and extending between the first and second surfaces thereof for the passage and measuring of light therebeneath; at least one photosensor positioned near the second surface and adjacent to the aperture such that light incident on the aperture is measured by the photosensor; a control system operably associated with the photosensor and the light source and configured to control the output of the light source in accordance with measurements received from the photosensor; a display configured for illumination by light reflected from the first surface; a first optical assembly having a lens positioned between the light source and the optical element, and a second optical assembly having a lens positioned between the optical element and the display.