Projection system for display, in particular a heads-up display, and associated display
US10295825B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2015 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Nov 20, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a projection system for a display, in particular a heads-up display, comprising a liquid crystal screen (12) and a back-lighting device (14) for said screen (12). The projection system is characterized in that said back-lighting device (14) comprises at least one light source (16) emitting light towards the screen (12), at least one lens (38a, 38b) suitable for collimating the light from the light source (16) towards the liquid-crystal screen (12), and reflective means (26) arranged on the surface of the lens (38a, 38b) located on the side of the light source (16), arranged such as to allow light to pass through same towards the screen (12) and to reflect towards the screen (12) almost all of the light propagating towards the lens (38a, 38b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.