A flight data display system providing the visual display of luminous markers which comprise, in particular, a fixed marker for indicating a reference incidence angle, a movable marker for indicating the instantaneous incidence angle detected by a sensor, and a movable marker indicating a reference slope angle. The amplitude and the sign of the reference slope angle are manually selected by the pilot by controlling the cursor of a potentiometer and by acting a voltage inverter. The system is applicable to all aircraft and can be utilized in all phases of flight, in particular for the landing, since the pilot can easily determined the top of descent point (alignment of the slope marker with the runway threshold), and observe that correct glide slope and incidence angle are maintained during the approach.

A display instrument for projecting aircraft flight data upon a transparent screen into the pilot's normal line of sight, wherein an optical objective projects images of luminous objects focused at infinity onto a combining glass; the luminous objects which represent the flight data to be displayed being carried out by means of electro-optical transducers such as electroluminescent diodes supplied by an associated supply circuit; servo means responsive to output signals of airborne sensor devices controlling the displacement of, and the selective supply to, the diodes representative of variable flight data.

A game apparatus includes a viewing device which incorporates a viewing console that receives replaceable visual cartridges and a microcomputer for generating game functions. The visual cartridges are automatically opened upon insertion into the viewing console to reveal a three-dimensional scene. When the visual cartridge is opened, its cover swings into alignment with a plurality of light emitting elements. These elements are operative to selectively illuminate various regions of the cover and to project indicia located on the illuminated region onto the scene provided by the viewing cartridge. Each viewing device can be provided with a plurality of different cartridges with covers bearing different symbols to produce a variety of visual effects useful in implementing game devices, particularly microcomputer controlled game devices, and visual displays such as advertising displays and the like.

An electrically-operated display device comprises an evacuated, or alternatively gas-filled, housing and three electric filaments disposed within the housing to provide an illuminated display when energized to incandescence. The filaments are carried within the housing on a planar panel that is supported from a base of the housing on terminal pins so as to have an upper face in close proximity to, and exposed for view through, a transparent wall of the housing. The filaments, connected at either end to the terminal pins, are threaded through holes spaced across the surface of the panel such that successive spaced parts of the filaments extend across the panel surface to define discrete portions of the symbol to be displayed. The display device is mounted in head-up display equipment of an aircraft as the source of an auxiliary stand-by display that may be selected for projection via a collimator onto a partially transparent reflector in the line of sight of the aircraft pilot. This auxiliary display is interchangeable with the main flight display provided by a cathode-ray tube in the event of failure of the tube, pilot operation of a selector handle in one direction retracting the tube from the collimator and then pivoting the stand-by display into the resultant space along an arcuate path substantially normal to the direction of retraction of the tube.

A telltale is sufficiently small and sufficiently bright for use in a head-up display such that the image of the telltale is projected of the combiner, e.g., the vehicle front windshield, and is clearly visible to the vehicle operator, even on bright sunny days. The apparatus includes a housing and a light source. The housing has an inner reflective surface with a focal point outside the housing and an aperture located between the reflective surface and the focal point. A graphics plate is mounted in the aperture. The telltale is highly emissive when light from the light source reflects off of the inner surface and through the aperture.