OPTICAL SYSTEM AND NEAR-EYE DISPLAY DEVICE THEREOF

The present invention is an optical system and near-eye display device thereof, including an optical waveguide and a light angle adjuster. The optical waveguide is provided with a coupling grating and a decoupler. The decoupler is provided with a red light decoupling grating, a green light decoupling grating and a blue light decoupling grating. The light angle adjuster cooperates with the output image and refresh speed of the display, and adjusts the light of each color of the three primary colors in the output image to enter the coupling grating at different incident angles by time division method. After the light of each color of the three primary colors passes through the coupling grating, The light of each color of the three primary colors travel to the decoupler in the optical waveguide at its respective diffraction angles. The light of each colors is decoupled in the decoupling grating of each corresponding color. In this invention, the light of each color is combined in space to form a larger viewing a