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Display device for volumetric imaging using a birefringent optical path length adjuster

A technology of optical path length and adjuster, used in instruments, image communication, stereo systems, etc.

Inactive Publication Date: 2007-02-07
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, up-conversion is not a very efficient process

Method used

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  • Display device for volumetric imaging using a birefringent optical path length adjuster
  • Display device for volumetric imaging using a birefringent optical path length adjuster
  • Display device for volumetric imaging using a birefringent optical path length adjuster

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Embodiment Construction

[0048] Figure 3a and 3b Diagram illustrating some of the basic principles used in 3D image display devices. exist Figure 3a In this case, a relatively large virtual image 30 of a small display screen 31 is produced by means of a Fresnel reflector 32 . exist Figure 3b In this case, a relatively large virtual image 35 of a small display screen 36 is produced by means of a Fresnel lens 37 . A virtual image 30 or 35 appears in the air in front of the lens. The viewer can focus on the image 30 or 35 and observe it 'floating' in the air.

[0049] Figure 4a and 4b Illustration Figure 3a and 3b Modification of the program. Such as Figure 4a As shown, the effective optical path length between the display screen 41 and the Fresnel reflector 42 is changed by setting an appropriate effective path length adjuster 43 . Similarly, if Figure 4b As shown in , the effective optical path length between the display screen 46 and the Fresnel lens 47 is changed by setting an app...

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Abstract

A display device for generating a three-dimensional volumetric image incorporates an optical path length adjuster enables electro-optical control of a physical path length between a display panel and a focusing element, to generate a virtual image within a defined imaging volume. The adjuster varies an optical path length between an input optical path and an output optical path and includes: a first polarisation switch for selecting a polarisation state for an input beam on the input optical path and an optical element having birefringent properties and thereby defining at least two possible effective optical paths of different lengths therethrough, for passing the input beam along a selected one of said at least two possible optical paths according to the selected polarisation state of the input beam and for providing an output beam of light, on said optical output path, that has travelled along the selected optical path.

Description

technical field [0001] The present invention relates to methods and devices for adjusting the optical path length between two optical elements. In particular, but not exclusively, the invention relates to optical path length adjustment in a three-dimensional display device producing virtual images within a defined imaging volume. Background technique [0002] Three-dimensional images can be created in several ways. For example, in a stereoscopic display, two images that can be single-observed by each eye of a viewer can be displayed simultaneously or time-divisionally. These images are selected with the aid of special glasses or goggles worn by the observer. In the former case, these glasses can be equipped with polarized lenses. In the latter case, these glasses can be equipped with electronically controlled shutters. These types of displays are relatively simple to construct and have low data rates. However, using dedicated viewing glasses is inconvenient, and the lac...

Claims

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Application Information

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IPC IPC(8): H04N13/04H04N13/388G02B30/25
CPCH04N13/0495H04N13/395H04N13/388H04N13/00
Inventor B·A·萨尔特斯L·P·巴克尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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