This application provides a 3D display
system and device, relating to the field of display technology. An image source provides a
light beam; a first quarter-wave plate controls the polarization direction; a 3D imaging
grating assembly separates the
parallax beam; a semi-transparent, semi-reflective
assembly splits the beam through reflection and folds the
optical path; and a second quarter-wave plate, in conjunction with a polarization reflection
assembly, folds the beam back and calibrates the polarization direction. Finally, the beams corresponding to the left and right eyes are incident on the
human eye, forming a 3D image. The optical components in each 3D display
system are arranged along the output direction of the image source's
optical axis, forming a flat, stacked optical structure. This facilitates multiple folds and propagations of the beam in the
optical path before it reaches the
human eye to complete the image, effectively improving the
clarity, stability, and overall
image quality. The first and second quarter-wave plates effectively isolate
stray light directly emitted from the image source and invalid beams in the
optical path that have not undergone polarization direction conversion, preventing
stray light from interfering with the
clarity of the image.