Polarization multiplexing devices for projection systems

Abstract

A polarization multiplexing device used in projection systems to convert unpolarized light into polarized light with the same polarization state. The polarization multiplexing device includes a group of polarization multiplexing units. All the polarization multiplexing units are arranged in an end-to-end manner, wherein each polarization multiplexing unit has an incident surface and an exit surface opposite to the incident surface, and includes a light conversion element, a light beam splitting component and a light reflective components. The light conversion element is used to convert the first polarized light into the second polarized light. The light beam splitting component is located on one side of the light conversion element, and is used to split the unpolarized light incident from the incident surface into the second polarized light emitted from the exit surface and the first polarized light directed to the light conversion element. polarized light. The light reflection component is located on the other side of the light conversion element, and is used for reflecting the second polarized light converted by the light conversion element so that the second polarized light is emitted from the exit surface.

Description

technical field [0001] The invention relates to the technical field of optical projection, in particular to a polarization multiplexing device used in a projection system. Background technique [0002] In projection systems based on liquid crystal displays such as LCOS and HTPS, in order to meet their polarized lighting conditions, polarizing devices are usually used in the projection system to convert the non-polarized light emitted by the light source system into polarized light. However, during the process of polarized light conversion, the projection system will lose at least half of the light energy, which will undoubtedly reduce the light energy utilization rate of the projection system, and even fail to meet the imaging requirements of high brightness and low power consumption of the projection system. Therefore, in order to improve the light energy utilization rate of the projection system, a polarization multiplexing device is usually used to convert the unpolarized...

AI Technical Summary

Problems solved by technology

Once there is a deviation between the 1 / 2 wave plate and the output polarized area of ​​the polarized beam splitting array 11P, the purity of the polarized light emitted from the polarization multiplexing device 10P will be reduced, and the brightness of the projection system will be reduced, thereby affecting The image quality of the projection system

[0005] In addition, for the structure of the existing polarization multiplexing device 10P, the current manufacturing process cannot reach the small size level, and cannot meet the small volume development requirements of the current micro-miniature micro-projection system, and it is extremely difficult to apply to today's hot development of augmented reality ( Augmented reality, AR), near-eye display (Near-eye display, NED), wearable and other fields

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