A grating-based optical waveguide light field display system, constituted by stacking at least one spectral characteristic optical waveguide projection units which project an image to a finite or infinite projection plane. Each spectral characteristic optical waveguide projection unit comprises: a pixel array (1001) of a display device, a spectro-grating (1012), an optical waveguide (1015), and other assemblies. For basic pixel sets which constitute the pixel array (1001), light emitted by pixels thereof passes through the spectro-grating (1012), is propagated along respective specific vector direction while the exit angle is restricted, and is guided to the eyes of an observer by the optical waveguide (1015) and the other assemblies in the form of a small-angle of divergence light beam, or a parallel narrow/fine light beam. Spatial overlay of small-angle of divergence light beams or parallel narrow/fine light beams having different vector directions is implemented by using grating spectroscopy, and an inherent focusing-convergence conflict problem of conventional optical waveguide display is overcome; by virtue of optical waveguides, a display engine of a thin structure is designed and implemented, and can be applied to screens and portable display terminals.

Grating-based optical waveguide light field display system

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Grating-based optical waveguide light field display system