An apparatus comprising: a first micro display array corresponding to a red color channel; a second micro display array corresponding to a green color channel; a third micro display array corresponding to a blue color channel; and an optical waveguide including a first major surface and a second major surface opposite to the first major surface, the optical waveguide further comprising: a first input grating region configured to receive a first light portion corresponding to the red color channel, a second input grating region configured to receive a second light portion corresponding to the blue color channel, wherein the second input grating region is offset from the first input grating region by a first offset, a third input grating region configured to receive a third light portion corresponding to the green color channel, wherein the third input grating region is offset from the second input grating region by a second offset, a first set of expansion gratings (102, 104), formed on the first major surface of the optical waveguide, configured to receive a first diffracted light portion of the first light portion from the first input grating region, a second set of expansion gratings (112, 114), formed on the first major surface of the optical waveguide, configured to receive a second diffracted light portion of the second light portion from the second input grating region, and a third set of expansion gratings (122, 124), formed on the second major surface of the optical waveguide, configured to receive a third diffracted light portion of the third light portion from the third input grating region. a first micro display array corresponding to a red color channel; a second micro display array corresponding to a green color channel; a third micro display array corresponding to a blue color channel; and an optical waveguide including a first major surface and a second major surface opposite to the first major surface, the optical waveguide further comprising: a first input grating region configured to receive a first light portion corresponding to the red color channel, a second input grating region configured to receive a second light portion corresponding to the blue color channel, wherein the second input grating region is offset from the first input grating region by a first offset, a third input grating region configured to receive a third light portion corresponding to the green color channel, wherein the third input grating region is offset from the second input grating region by a second offset, a first set of expansion gratings (102, 104), formed on the first major surface of the optical waveguide, configured to receive a first diffracted light portion of the first light portion from the first input grating region, a second set of expansion gratings (112, 114), formed on the first major surface of the optical waveguide, configured to receive a second diffracted light portion of the second light portion from the second input grating region, and a third set of expansion gratings (122, 124), formed on the second major surface of the optical waveguide, configured to receive a third diffracted light portion of the third light portion from the third input grating region. a first input grating region configured to receive a first light portion corresponding to the red color channel, a second input grating region configured to receive a second light portion corresponding to the blue color channel, wherein the second input grating region is offset from the first input grating region by a first offset, a third input grating region configured to receive a third light portion corresponding to the green color channel, wherein the third input grating region is offset from the second input grating region by a second offset, a first set of expansion gratings (102, 104), formed on the first major surface of the optical waveguide, configured to receive a first diffracted light portion of the first light portion from the first input grating region, a second set of expansion gratings (112, 114), formed on the first major surface of the optical waveguide, configured to receive a second diffracted light portion of the second light portion from the second input grating region, and a third set of expansion gratings (122, 124), formed on the second major surface of the optical waveguide, configured to receive a third diffracted light portion of the third light portion from the third input grating region.