Micro projection display device and AR display system with same

Abstract

The invention relates to a micro projection display device which is characterized by comprising a projection light source, a PBS prism, a projection lens module and an LCOS imaging chip, wherein the projection light source is used for emitting first polarized light; the PBS prism is used for transmitting first polarized light emitted by the projection light source to the projection lens module; the projection lens module is used for focusing the first polarized light transmitted by the PBS prism to the LCOS imaging chip; the LCOS imaging chip is used for modulating the first polarized light focused by the projection lens module into second polarized light and emitting the modulated second polarized light to the PBS prism; the PBS prism is also used for reflecting the second polarized light emitted by the LCOS imaging chip; the projection light source, the PBS prism, the projection lens module and the LCOS imaging chip are sequentially arranged along an axis.

Description

technical field [0001] The invention relates to the technical field of micro-projectors, in particular to a micro-projection display device and an AR display system having the same. Background technique [0002] The core of the design of the micro projection device is to use as few lenses as possible to meet the image quality requirements while ensuring a small size. At present, LCOS micro-projectors usually include a projection lighting system, a PBS polarizing beam splitter, an LCOS imaging chip, and a projection lens. Usually, the projection lighting system and the PBS polarizing beam splitting prism are located in the first direction, while the LCOS imaging chip, PBS polarizing beam splitting prism, and projection lens Located in the second direction, and the first direction is perpendicular to the second direction, since the volume of the projection lighting system and the projection lens are large, when the projection lighting system and the projection lens are vertica...

AI Technical Summary

Problems solved by technology

At present, LCOS micro-projectors generally include a projection lighting system, a PBS polarizing beam splitter, an LCOS imaging chip, and a projection lens. Usually, the projection lighting system and the PBS polarizing beam splitting prism are located in the first direction, while the LCOS imaging chip, PBS polarizing beam splitting prism, and projection lens Located in the second direction, and the first direction is perpendicular to the second direction, since the volume of the projection lighting system and the projection lens are large, when the projection lighting system and the projection lens are vertically arranged, there is a gap between the projection lighting system and the projection lens The space is empty, resulting in a lot of waste of space. At the same time, it leads to a large size of the micro-projector, which is difficult to be miniaturized, not easy to carry, and not easy to cut into the AR display system. When cutting into the AR display system, additional optical path design is required. A right-angle prism is set to reflect the polarized light passing through the LCOS imaging chip and projection lens to the optical waveguide, resulting in a very complicated structure

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