Head-up display

US6636277B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Bernd Eberhardt · Dieburg, DE
• Bernd Ludewig · Weinheim, DE
• Ralf Mayer · Weitra, AT

Key dates

• Filing date: Dec 7, 2001
• Grant date: Oct 21, 2003
• Expiry date: Dec 7, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0118
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A head-up display for vehicles, in which information from a display device is projected onto a transparent projection area, the display device has two transparent screens between which a liquid crystal substance and electrodes are arranged, polarized light penetrating through the liquid crystal substance, the liquid crystal substance rotating the polarized light penetrating through the liquid crystal substance in a plane of polarization in a manner dependent on the driving of the electrodes with a voltage. The polarized light emerging form the liquid crystal substance is not sent through a polarizer, but rather is polarized by the reflection at the transparent projection area or at one or more other reflectors which is or are arranged in the beam path of the polarized light between the liquid crystal substance and the transparent projection area.