Autostereoscopic 3D display

Abstract

The invention relates to an autostereoscopic 3D display (1), comprising an illumination unit (2) having two light sources (3, 4), a light guide (5), a holographic-optical element (6) as a diffractiveoptical light directing element, a transparent display panel (7), and a control unit (8) for alternately synchronizing the light sources (3, 4) with a right and a left parallactic image represented onthe display panel (7), wherein the light sources (3, 4) are oriented so as to irradiate light into the light guide (5) from various directions and the holographic-optical element (6) and the displaypanel (7) are arranged such that light emitted by the light guide is diffracted by the holographic-optical element (6) in two different directions, depending on the preferred direction of the light, and directed through the display panel (7), wherein at least one surface of the light guide (5); has a refractive surface (10).

Description

[0001] This application is a divisional application of the invention patent application with the filing date of September 14, 2011, the application number of 201180055164.9, and the title of "Free Stereoscopic 3D Display". technical field [0002] The invention relates to autostereoscopic 3D displays. Background technique [0003] An autostereoscopic 3D display (ASD) is a display screen capable of displaying stereoscopic images (that is, images that appear three-dimensional to one or more persons). A three-dimensional image is understood to be an image that additionally has a depth effect compared to a conventional two-dimensional image. In the case of ASD, the viewer does not need aids, such as glasses, prism viewers, or other optical aids, as opposed to conventional stereoscopic displays. [0004] In order to obtain a three-dimensional impression, in an autostereoscopic display, two images are projected such that each eye sees a different image by means of parallax. In t...

AI Technical Summary

Problems solved by technology

However, due to having left and right pixel strips in such an ASD, the image resolution is halved compared to conventional 2D displays

Furthermore, it is technically difficult to render 2D images at native resolution by means of liquid crystal elements (LCDs) through the corresponding configuration of the band mode

Another disadvantage of 2D rendering is that band mode creates a parallax barrier that blocks some of the light, darkening the image

Throughout the system, interference effects can lead to banding, reduced resolution and / or insufficient channel separation for 3D rendering and an overall lack of clarity

This can in turn lead to more eye strain for the viewer

Furthermore, a significant difference in visual quality compared to commercially available 2D HDTV (High Definition Television) can be seen, which reduces the market acceptance of this type of autostereoscopic display

[0012] A further disadvantage when using light-guiding elements with several layers consisting of refractive deflecting structures is that it is difficult to ensure the necessary high lateral positioning accuracy of the individual refractive optical surface elements with respect to each other

If a small deviation occurs here, the separation of two or more channels for 3D rendering can be greatly compromised

Furthermore, possibly already existing optical interference effects such as Moire effects are further exacerbated in this case

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