Projection optical system

Abstract

The invention discloses a projection optical system. The projection optical system comprises a light source, a light splitting and combining device, a first spatial light modulator and a second spatial light modulator; the light source is used for emitting illumination light beams, and the illumination light beams comprise a plurality of sub light beams; and the light splitting and combining device comprises a light splitting surface and a light combining surface, and incident angles from the sub-beams to the light splitting surface are different. The incident angle from any sub-light beam tothe light splitting surface is equal to or basically equal to the incident angles from a first sub-light beam and a second sub-light beam corresponding to the sub-light beams to the light combining surface. In the mode, the light energy loss of the illumination light beams during light splitting and combining can be reduced, and therefore the output brightness of the system is improved.

Description

technical field [0001] The present application relates to the field of optical technology, in particular to a projection optical system. Background technique [0002] In the fields of low-end cinema projectors and high-end engineering projectors, users have a great demand for dual-chip optical engines. Compared with the three-chip high-end projector, the double-chip optical engine can reduce the cost on the basis of maintaining 12-bit projection grayscale; compared with the single-chip engineering projector, the double-chip optical engine can realize Higher brightness and gray scale. Therefore, for a dual-chip optical engine system, its advantages can only be manifested if a higher optical efficiency is achieved. [0003] The inventors of the present application found in the long-term research and development process that in the existing technology, the incident light in the double-chip optical engine has a spectral loss in the process of light separation and synthesis, so...

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Problems solved by technology

[0003] In the long-term research and development process, the inventors of the present application found that in the existing technology, the incident light in the double-chip optical engine has a spectral loss in the process of light separation and synthesis, so the colors of the separated red fluorescence and green fluorescence are relatively bright. Well, it is close to the standard color coordinates of DCI-P3, so the number of red and green lasers added is limited, so that although the whole machine can achieve the color gamut standard of the projector, the brightness that can be achieved is limited

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