A near-eye display device comprising: a projection system configured to display an image; a first expanding waveguide including a first surface, and a second surface opposite to the first surface, wherein light from the projection system is incident upon the first surface or the second surface; a first expanding diffractive grating included in the first expanding waveguide; a second waveguide upon which light emitted from the first expanding waveguide is incident; and a second diffractive grating included in the second waveguide, wherein the light, from the projection system, is incident upon the first expanding diffractive grating included in the first expanding waveguide to form (-1)-order diffraction, 0-order diffraction, and (+1)-order diffraction from respective diffractions of light beams, wherein the first expanding diffractive grating and the second diffractive grating are located on different planes so that the 0-order diffracted light emitted from the first expanding waveguide is incident upon the second waveguide, wherein the (-1)-order diffracted light and the (+1)-order diffracted light are extended in the first expanding waveguide due to internal total reflection, such that the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are fed back to the first expanding diffractive grating, and the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are made incident upon different locations on the first expanding diffractive grating; and wherein the new (-1)-order diffraction, new 0-order diffraction, and new (+1)-order diffraction are formed from each of the extended (-1)-order diffracted light and the extended (+1)-order diffracted light. a projection system configured to display an image; a first expanding waveguide including a first surface, and a second surface opposite to the first surface, wherein light from the projection system is incident upon the first surface or the second surface; a first expanding diffractive grating included in the first expanding waveguide; a second waveguide upon which light emitted from the first expanding waveguide is incident; and a second diffractive grating included in the second waveguide, wherein the light, from the projection system, is incident upon the first expanding diffractive grating included in the first expanding waveguide to form (-1)-order diffraction, 0-order diffraction, and (+1)-order diffraction from respective diffractions of light beams, wherein the first expanding diffractive grating and the second diffractive grating are located on different planes so that the 0-order diffracted light emitted from the first expanding waveguide is incident upon the second waveguide, wherein the (-1)-order diffracted light and the (+1)-order diffracted light are extended in the first expanding waveguide due to internal total reflection, such that the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are fed back to the first expanding diffractive grating, and the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are made incident upon different locations on the first expanding diffractive grating; and wherein the new (-1)-order diffraction, new 0-order diffraction, and new (+1)-order diffraction are formed from each of the extended (-1)-order diffracted light and the extended (+1)-order diffracted light. wherein the light, from the projection system, is incident upon the first expanding diffractive grating included in the first expanding waveguide to form (-1)-order diffraction, 0-order diffraction, and (+1)-order diffraction from respective diffractions of light beams, wherein the first expanding diffractive grating and the second diffractive grating are located on different planes so that the 0-order diffracted light emitted from the first expanding waveguide is incident upon the second waveguide, wherein the (-1)-order diffracted light and the (+1)-order diffracted light are extended in the first expanding waveguide due to internal total reflection, such that the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are fed back to the first expanding diffractive grating, and the extended (-1)-order diffracted light and the extended (+1)-order diffracted light are made incident upon different locations on the first expanding diffractive grating; and wherein the new (-1)-order diffraction, new 0-order diffraction, and new (+1)-order diffraction are formed from each of the extended (-1)-order diffracted light and the extended (+1)-order diffracted light.