An optical chamber, an optical system, and a display device are provided. The optical chamber includes: a plurality of sidewalls, including a first sidewall having at least one opening, configured to reflect light in the optical chamber; and a light path adjusting element connected with the first sidewall, wherein the orthographic projection of the light path adjusting element onto the plane where the first sidewall lies at least partially lies in the area where the opening is located, and the light path adjusting element is configured to uniformly emit the light reflected by the plurality of sidewalls to the outside.