HUD comprising holographic optical elements

Abstract

A display device (1), more particularly a head-up display, comprising a light-emitting image source (3) and comprising optical elements (4, 5, 6, 7, 8, 9) forming a beam path (12) for beams is presented. In this case, the optical elements (4, 5, 6, 7, 8, 9) comprise a holographic optical element (8) having a predefined optical imaging function and a reflector (5). The holographic optical element (8) is positioned in a manner spatially separated from the reflector (5) in the beam path (12). Moreover, the holographic optical element (8) is arranged in the beam path (12) in such a way that beams in a first section of the beam path are directed onto the holographic optical element (8) in order to deflect them under the influence of the imaging function of the holographic optical element (8) into a second section of the beam path in a new direction. The reflector (5) and the holographic optical element (8) are arranged relative to one another in such a way that beams emitted by the reflector (5) into a third section of the beam path (12) can at least partly transilluminate the holographic optical element, wherein illumination angles of transilluminating beams in the third section of the beam path (12) substantially deviate from angles of incidence at which an influence of the imaging function of the holographic optical element (8) is effective.

Description

technical field [0001] The invention relates to a display device according to the preamble of claim 1 . Background technique [0002] Thanks to advances in optical technology, it is possible to build smaller and more energy-efficient optical systems, which are increasingly used in display systems in automobiles. This especially facilitates the development of head-up displays, with which vehicle data such as speed, rotational speed, fuel level or weather conditions, for example, can be displayed in the driver's field of vision depending on the traffic situation in the direction of travel. Therefore many new display device solutions and improvements have been disclosed in the last few years. [0003] Holographic optical elements are disclosed in Physical and Technical Optical Systems [1]. A known application of holographic optical elements in display systems is, for example, to correct imaging errors of optical paths or individual optical elements. For example DE 103 44 688...

AI Technical Summary

Problems solved by technology

A disadvantage of this system however is that the visibility of the displayed information is relatively sensitively line-of-sight dependent due to the strong angular dependence of the diffraction image

Another disadvantage of this technique is the relatively high and thus expensive computing power required to convert conventional image data into interference patterns for the control

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