Patent ID: 6864927

Claim:
A head up display system in an airplane or vehicle comprising a light emitting image source for projecting an image generated from a control panel to a field of view of an operator of the airplane or vehicle, the system comprising: a light source operably coupled to a control panel for projecting an image therefrom; a display screen comprising one of a liquid crystal display panel and an electrochromic display panel, wherein the display screen is bounded by a first surface oriented to receive the image projected from the light source without prior passage thereof through the display screen and a second, opposing surface oriented to receive ambient light; a power source configured to provide an output for adjusting a transparency of the display screen to the ambient light; and a light responsive sensor positioned to receive the ambient light without prior passage thereof through the display screen, the light responsive sensor being operably coupled to a control device for altering the output of the power source responsive to an intensity of the ambient light.