µ-LED, µ;-LED DEVICE, DISPLAY AND METHOD FOR THE SAME

Abstract

The invention relates to various aspects of a μ-LED or a μ-LED array for augmented reality or lighting applications, in particular in the automotive field. The μ-LED is characterized by particularly small dimensions in the range of a few μm.

1 . μ-LED arrangement having at least one μ-LED configured to emit radiation via a light-emitting surface, and comprising a polarization element which adjoins the light-emitting surface at least in sections and changes a polarization and/or an intensity of a radiation emanating from the μ-LED when the radiation passes through the polarization element,
 characterised in that 
 the polarizing element comprises a photonic structure. 
 
     
     
         2 . μ-LED arrangement according to  claim 1 , characterized in that it is a three-dimensional photonic structure and/or that the polarizing element is configured in the form of a layer which is arranged at least in regions on the light-emitting surface. 
     
     
         3 . μ-LED arrangement according to  claim 1 , in which
 the μ-LED is a vertical μ-LED with one connecting contact on opposite sides. 
 
     
     
         4 . μ-LED arrangement according to  claim 1 , characterized in that the μ-LED, which is configured to emit light, in particular red, green, blue, ultraviolet or infrared light, which is irradiated into the polarizing element, and that the polarizing element polarizes the radiation in an oscillation direction when passing through the polarizing element. 
     
     
         5 . μ-LED arrangement according to  claim 1 , wherein
 the polarising element has spiral and/or rod-shaped structural elements. 
 
     
     
         6 . μ-LED arrangement according to  claim 1 , wherein
 the μ-LED comprises at least one converter element with a converter material which, excited by excitation radiation emanating from the μ-LED, emits converted radiation. 
 
     
     
         7 . μ-LED arrangement according to  claim 1 ,
 characterised in that 
 the polarizing element comprises at least one three-dimensional photonic crystal. 
 
     
     
         8 . μ-LED array according to  claim 1 , wherein
 the polarizing element comprises at least two two-dimensional photonic crystals arranged one behind the other along a beam path of the radiation penetrating the polarizing element. 
 
     
     
         9 . μ-LED array according to  claim 1 , wherein
 the polarizing element comprises at least two different polarization properties and/or degrees of transmission depending on a wavelength of the radiation passing through the polarizing element. 
 
     
     
         10 . μ-LED arrangement according to  claim 1 ,
 characterised in that 
 the μ-LED comprises a converter element with a converter material which, excited by excitation radiation emanating from the μ-LED, emits converted radiation, and in that excitation radiation incident on the polarizing element is polarized differently and/or absorbed to a different extent when passing through the polarizing element compared with converted radiation passing through. 
 
     
     
         11 . μ-LED arrangement according to  claim 1 , wherein
 a three-dimensional structure of the polarizing element is at least partially incorporated in a semiconductor layer of the μ-LED adjacent to the light-emitting surface. 
 
     
     
         12 . μ-LED array according to  claim 1 , which is a three-dimensional photonic structure and converter material is disposed in the three-dimensional photonic structure. 
     
     
         13 . Method for producing a μ-LED arrangement having at least one μ-LED which emits radiation via a light-emitting surface, and having a polarization element which adjoins the light-emitting surface at least in sections and changes a polarization and/or an intensity of a radiation emanating from the μ-LED when the radiation passes through the polarization element,
 characterised in that 
 an in particular three-dimensional photonic structure, in particular by two-photon lithography or glancing angle deposition, is applied to the light-emitting surface of the μ-LED as polarization element and/or the photonic structure is arranged in a semiconductor layer of the μ-LED adjoining the light-emitting surface. 
 
     
     
         14 . Method according to  claim 13 , characterized in that
 the photonic structure is dimensioned as a function of the wavelength of the radiation emitted by the μ-LED   
     
     
         15 . Use of a μ-LED array according to  claim 1  in a device for generating three-dimensional images. 
     
     
         16 . Use of a μ-LED array according to  claim 1  in a device for computer-aided generation of three-dimensional images for an augmented reality application. 
     
     
         17 . Arrangement comprising:
 μ-LED arrangement for generating a pixel of a display, comprising
 a flat carrier substrate; and 
 at least three μ-LED, which are arranged on a mounting side of the carrier substrate 
   wherein the at least three μ-LED are adapted to emit light of different color transverse to a carrier substrate plane in a direction away from the carrier substrate;
 a flat reflector element; 
   wherein the reflector element is spatially arranged on the assembly side relative to the at least three μ-LED and is configured to reflect light emitted by the at least three μ-LED in the direction of the carrier substrate;   wherein the carrier substrate is at least partially transparent so that light reflected from the reflector element propagates through the carrier substrate and emerges at a display side of the carrier substrate opposite the mounting side; wherein   a photonic structure is incorporated in or on the carrier substrate, which first and second regions with different refractive indexes, whereas converter material forms one of the first and second region and is configured in such a way that the radiation is emitted as a directed beam of rays.