Methods and devices for data projection

Abstract

Provided are a device and method for data projection, in particular for windshields. A holographic element ( 11 ) is used here, in particular an imaging holographic element.

1 . A device for data projection, comprising:
 a holographic element be arranged by a carrier, and   an imaging device which is adapted and arranged to transmit light, corresponding to data to be projected, to the holographic element, wherein the holographic element is adapted to direct light received by the imaging device to a viewing site.   
     
     
         2 . The device as claimed in  claim 1 , wherein the device is adapted to represent a three-dimensional object. 
     
     
         3 . The device as claimed in  claim 2 , wherein the imaging device comprises an amplitude modulator and a phase modulator for generating three-dimensional images. 
     
     
         4 . The device as claimed in  claim 1 , wherein the holographic element is adapted for imaging an image provided by the imaging device on at least one intermediate image that is viewable from the viewing site. 
     
     
         5 . The device as claimed in  claim 4 , wherein the at least one intermediate image comprises a real image. 
     
     
         6 . The device as claimed in  claim 4 , wherein the at least one intermediate image comprises a virtual image. 
     
     
         7 . The device as claimed in  claim 4 , wherein a distance of the intermediate image from the viewing site is at least 2 m. 
     
     
         8 . The device as claimed in  claim 4 , wherein the at least one intermediate image comprises at least two intermediate images. 
     
     
         9 . The device as claimed in  claim 8 , wherein the at least two intermediate images are arranged at different distances from the holographic element. 
     
     
         10 . The device as claimed in  claim 8 , wherein the at least two intermediate images are viewable from in each case different viewing sites. 
     
     
         11 . The device as claimed in  claim 8 , wherein the holographic element is adapted to generate a first intermediate image of the at least two intermediate images on the basis of a first group of wavelengths, and a second intermediate image of the at least two intermediate images on the basis of a second group of wavelengths, which differ from the wavelengths of the first group. 
     
     
         12 . The device as claimed in  claim 8 , wherein the imaging device comprises a first imaging system for generating a first intermediate image of the at least two intermediate images, and a second imaging system for generating a second intermediate image of the at least two intermediate images, wherein the first imaging system and the second imaging system are arranged at different sites. 
     
     
         13 . The device as claimed in  claim 1 , wherein the holographic element comprises a holographic diffusing screen. 
     
     
         14 . The device as claimed in  claim 1 , further comprising the carrier, wherein the carrier comprises a windshield that is arranged at an angle <15° with respect to the perpendicular. 
     
     
         15 . The device as claimed in  claim 14 , wherein an angle between a chief ray from the imaging device to the holographic element and a perpendicular on the windshield is between 40 and 80°. 
     
     
         16 . The device as claimed in  claim 1 , wherein the holographic element is adapted to direct light, which is incident on the holographic element at a specific angle range, to the viewing site and to be transparent for light outside the specific angle range. 
     
     
         17 . The device as claimed in  claim 1 , wherein the holographic element is adapted to be transparent for light outside one or more specified wavelength ranges. 
     
     
         18 . The device as claimed in  claim 17 , wherein the one or more wavelength ranges comprise a wavelength in the red range, a wavelength in the green range, and/or a wavelength in the blue range. 
     
     
         19 . The device as claimed in  claim 17 , wherein a width of the wavelength ranges is <20 nm, in particular <10 nm. 
     
     
         20 . The device as claimed in  claim 17 , wherein the one or more wavelength ranges comprise a first group of wavelength ranges and a second group of wavelength ranges, wherein the holographic element is adapted to direct wavelengths of the first group to a different viewing site than wavelengths of the second group. 
     
     
         21 . The device as claimed in  claim 1 , wherein the holographic element has an imaging function. 
     
     
         22 . The device as claimed in  claim 1 , wherein the holographic element is adapted to a curvature of the carrier. 
     
     
         23 . The device as claimed in  claim 1 , wherein the holographic element is adapted to protect a viewer of the holographic element against external laser radiation. 
     
     
         24 . A method for operating a device as claimed in  claim 1 , comprising:
 illuminating the holographic element of the device, and   directing the light to the viewing site by way of the holographic element.   
     
     
         25 . The method as claimed in  claim 13 , wherein said illuminating comprises illuminating with light of at least one red wavelength, at least one green wavelength, and/or at least one blue wavelength. 
     
     
         26 . A use of a holographic element in a windshield for the protection against laser pointers.