Abstract: The invention is directed to an arrangement for the homogeneous illumination of an image plane, preferably for application in a head-up display in a motor vehicle, comprising illumination optics having an array of emitters with a broad emitting characteristic, for example, an arrangement of luminescent diodes (LEDs, OLEDs), an integrator array, and an image-generating element, and the optical axis of an emitter is associated with the mechanical axis of an integrator of the integrator array. According to the invention, at least two microlens arrays are provided for the purpose of achieving an angular homogeneity of the rays exiting from the integrator array on the illuminated area of the image-generating element at the light outlet of the integrator array.

Abstract: The invention relates to a light-mixing rod for homogenizing a light bundle, preferably for use in projection devices, wherein the intensity centroid of the light bundle moves in a longitudinal direction between a light inlet surface and a light outlet surface, and reflecting surfaces are present in the light-mixing rod, the surface normals of said reflecting surfaces being perpendicular or inclined relative to said longitudinal direction, with partial beams being reflected by said reflecting surfaces so as to guide the light bundle. Light emitting diodes having a direction of action oriented toward the interior space and having a defined radiation characteristic are provided in the lateral surfaces of the light-mixing rod and/or in the light inlet surface for the purpose of forming the light bundle.

Abstract: The invention relates to a light-mixing rod for homogenizing a light bundle, preferably for use in projection devices, wherein the intensity centroid of the light bundle moves in a longitudinal direction between a light inlet surface and a light outlet surface, and reflecting surfaces are present in the light-mixing rod, the surface normals of said reflecting surfaces being perpendicular or inclined relative to said longitudinal direction, with partial beams being reflected by said reflecting surfaces so as to guide the light bundle.

Abstract: In order to provide an arrangement for the simultaneous generation of a positive image and a negative image in digital projection, comprising a light source, polarizing optics for delivering a preferably linearly polarized light flow, at least one polarizing beam splitter, and an LCD panel, by which a positive image and a negative image are generated simultaneously in an economical, reliable and highly accurate manner using simple technical apparatus, it is proposed that two polarizing beam splitters are provided in the beam path between a light source with polarizing optics arranged following the light source and a reflecting LCD panel and a Faraday rotator is arranged between the polarizing beam splitters.