04961625 is referenced by 188 patents and cites 22 patents.

An optical display system (10) presents visual source information to an observer (18). The display system includes a vision unit (14) that has reflective surfaces (16) through which the observer can view an outside world scene and which reflect source information emanating from an information source (22) for display to the observer. In a preferred embodiment, the optical display system constitutes a head-up display system for an automobile and the observer is the driver of the automobile. The vision unit constitutes an automobile windshield with or without a reflection enhancement material and whose inner and outer surfaces reflect source information carried by light propagating from the information source, such as a liquid crystal display (32). A projection lens system (24) positioned between the inner surface of the windshield and the information source has optical light-directing properties for compensating for optical aberrations introduced by the nonplanar windshield surface. The projection lens system includes an aspheric element (262) that is unique to a specific aspheric windshield shape and remaining elements that are common to a great number of different windshield shapes. A positioning mechanism ( 130) allows the driver to adjust the vertical position of the source information (60) reflected by the windshield within a total display field of view for optimal viewing by a seated driver. The positioning mechanism also automatically changes the distance between the display image and the driver as a function of vehicle speed to promote safe vehicle operation.

Title
Automobile head-up display system with reflective aspheric surface
Application Number
98528
Publication Number
4961625
Application Date
September 15, 1989
Publication Date
October 9, 1990
Inventor
John P Desmond
Portland
OR, US
Mark A Thomas
Lake Oswego
OR, US
Robert B Wood
Hillsboro
OR, US
Agent
Stoel Rives Boley Jones & Grey
Assignee
Flight Dynamics
OR, US
IPC
G02B 13/18
G02B 9/06
G02B 27/10
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