Head up display system using a diffusing image plane

US6043937A · kind A · utility

Assignee

• Delphi Technologies · US

Inventors

• Mark William Hudson · Russiaville, US
• Ning Wu · Shanghai, CN
• Doyle Joseph Groves · Noblesville, US
• Timothy J. Newman · Noblesville, US
• Dale J. Igram · Kokomo, US
• Jianhua Li · Beijing, CN
• Gerald J. Witt · Carmel, US
• Mark A. Koors · Kokomo, US
• Mark Robert Vincen · Noblesville, US

Key dates

• Filing date: Mar 11, 1999
• Grant date: Mar 28, 2000
• Expiry date: Mar 11, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/0101
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A head up display system having a diffusing image plane or diffuser. The light output of a relatively small image source is imaged on the diffuser by way of imaging optics. A mirror is used to image light from the diffuser onto a windshield and correct for distortion caused by the windshield. The diffuser is advantageously used when a large field-of-view is desired, or sun load characteristics need to be addressed. The diffuser may be flat or curved in order to optimize the system for different applications. The magnification of the mirror may be made relatively low, and the solar energy density that is made incident on the image source is reduced, providing for a low cost, high performance, color head up display system.