OVERHEAD PROJECTION DISPLAY DEVICE

• US 20160238921A1
• Filed: 09/26/2014
• Published: 08/18/2016
• Est. Priority Date: 10/03/2013
• Status: Active Grant

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation), Renault Sas (Renault)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation), Renault Sas (Renault)
• Inventors: PERTENAIS, Martin, SERMET, Frdric, REGNIER, Stphane, ROSSINI, Umberto, GETIN, Stphane
• Granted Patent: US 9,804,482 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 5/32 Holograms used as optical elements
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/2013 Plural light sources
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/62 Translucent screens
• CPC Class Codes: G03B 33/06 by additive-colour projection apparatus
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129

Abstract

A rear-projection display device comprises a mobile light source supplying a light beam of at least one wavelength, a holographic mirror reflecting only said at least one wavelength, an absorbent screen and a transmissive diffuser, the absorbent screen being placed on the rear face of the holographic mirror, the elements being arranged such that the beam from the light source is reflected on the holographic mirror in order to sweep the surface of the transmissive diffuser.

Claims

1. A rear-projection display device comprising a mobile light source supplying a light beam of at least one wavelength, a holographic mirror reflecting only said at least one wavelength, an absorbent screen, and a transmissive diffuser, the absorbent screen being placed on the rear surface of the holographic mirror, the elements being arranged so that the beam from the light source is reflected on the holographic mirror to scan the surface of the transmissive diffuser.

2. The device of claim 1, wherein the light source is a laser source.

3. The device of claim 1, further comprising a planar mirror on the path of the light beam between the source and the holographic mirror.

4. The device of claim 1, wherein the light source supplies a light beam at a first red wavelength, a second blue wavelength, and a third green wavelength.

5. The device of claim 1, wherein the light source is assembled to be mobile along two axes.

6. The device of claim 1, wherein the holographic mirror is formed of a film comprising, across its bulk, Bragg mirrors.

7. The device of claim 1, wherein the holographic mirror is formed of a film comprising, across its bulk, Fabry Pé

rot-type cavities.

8. The device of claim 1, wherein the absorbent screen is a black screen.

9. The device of claim 1, further comprising a package having the mobile light source, the holographic mirror, and the absorbent screen integrated therein, an opening being defined in the package, the transmissive diffuser being placed at the level of said opening.

10. The device of claim 1, wherein the transmissive diffuser has a curved surface.

11. The device of claim 1, wherein the transmissive diffuser is a holographic diffuser.

12. A vehicle comprising a central console having the device of claim 1 integrated therein.