Optical polarisation device for a stereoscopic image projector

Abstract

The invention concerns an optical polarisation device (3) for a stereoscopic image projector, comprising: - a polarising optical element (304) comprising two beam separating / polarising blades (322, 324) joined to each other; - first (312) and second (314) optical reflectors configured to modify, respectively, the trajectory of first and second reflected light beams such that said reflected and transmitted light beams are projected to form a same stereoscopic image; - first (316), second (318) and third (320) polarisation modulators capable of selectively switching the optical polarisation, respectively, of a transmitted light beam, and of the first and second reflected light beams, between the first and second optical polarisation states; - a control circuit (31) for controlling the polarisation modulators.

Description

technical field [0001] The invention relates to an optical polarization device for a stereoscopic image projector. The invention also relates to a system for displaying stereoscopic images and a method for displaying stereoscopic images. Background technique [0002] In a known manner, the projection of a stereoscopic image generally uses alternate projections on a screen of two subsequences of a temporally multiplexed stereoscopic image. One of these subsequences of images is intended to be seen by the viewer's left eye, while another subsequence of images is intended to be seen by the viewer's right eye, thereby creating a salient impression for the viewer. Viewers are typically equipped with anaglyph glasses configured to allow each eye of the viewer to see only a sub-sequence of images intended for it. In particular, display systems with passive anaglyph glasses are known. In such systems, different optical polarization states are applied to the two subsequences of th...

AI Technical Summary

Problems solved by technology

[0008] However, this device presents a number of disadvantages, such as significant bulkiness or complex production, resulting in high cost

In fact, the rapid amplification of the beam width, combined with the successive bounces of this beam (initially as a first reflection on the beamsplitter-polarizer, and then as a second reflection on the reflector), forces the use of optical components, especially for reflectors, thereby escalating the cost and bulk of the device

In addition, the beamsplitter-polarizer must be placed at a significant distance from the projector in order to function properly, involving significant bulkiness of the beamsplitter-polarizer used to intersect the incident beam

Furthermore, the path length difference between the primary beam passing through the beam splitter-polarizer and the secondary beam reflecting first on the beam splitter-polarizer and then on the reflector is not negligible, resulting in Perceptible size difference between the resulting image and the image from the secondary beam

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