A device configured to control image light associated with virtual images within a field of view, comprising: an imager configured to produce the image light; a waveguide display including a polarization-sensitive in-coupling diffractive optical element configured to in-couple image light into the waveguide display or transmit image light according to a state of polarization of the image light, at least one intermediate DOE configured to expand an exit pupil of the image light in a first direction of the FOV, and an out-coupling DOE configured to expand the exit pupil of the image light in a second direction of the FOV and further configured to out-couple image light out of the waveguide display to an eye of a user of the device; characterised in that the device further comprises a pair of MEMS (micro electro mechanical system) scanners (2608, 2610) operatively coupled to perform raster scanning of the virtual images in the FOV using the image light from the imager, the MEMS scanners (2608, 2610) further providing the image light to the in-coupling DOE in the waveguide display; and a polarizing beam splitter device configured to direct image light to a first MEMS scanner in the pair when a state of polarization of the image light is a first state of polarization and to a second MEMS scanner in the pair when the state of polarization of the image light is a second state of polarization, a pair of quarter wave plates, each quarter wave plate respectively disposed adjacent to a MEMS scanner in the pair of MEMS scanners so that image light makes two passes through each quarter wave plate when the image light is reflected by each MEMS scanner, the state of polarization of the image light changing to an orthogonal state after each of the two passes, wherein the polarization-sensitive in-coupling DOE is located between the polarizing beam splitter device and one of the MEMS scanners in the pair of MEMS scanners. an imager configured to produce the image light; a waveguide display including a polarization-sensitive in-coupling diffractive optical element configured to in-couple image light into the waveguide display or transmit image light according to a state of polarization of the image light, at least one intermediate DOE configured to expand an exit pupil of the image light in a first direction of the FOV, and an out-coupling DOE configured to expand the exit pupil of the image light in a second direction of the FOV and further configured to out-couple image light out of the waveguide display to an eye of a user of the device; characterised in that the device further comprises a pair of MEMS (micro electro mechanical system) scanners (2608, 2610) operatively coupled to perform raster scanning of the virtual images in the FOV using the image light from the imager, the MEMS scanners (2608, 2610) further providing the image light to the in-coupling DOE in the waveguide display; and a polarizing beam splitter device configured to direct image light to a first MEMS scanner in the pair when a state of polarization of the image light is a first state of polarization and to a second MEMS scanner in the pair when the state of polarization of the image light is a second state of polarization, a pair of quarter wave plates, each quarter wave plate respectively disposed adjacent to a MEMS scanner in the pair of MEMS scanners so that image light makes two passes through each quarter wave plate when the image light is reflected by each MEMS scanner, the state of polarization of the image light changing to an orthogonal state after each of the two passes, wherein the polarization-sensitive in-coupling DOE is located between the polarizing beam splitter device and one of the MEMS scanners in the pair of MEMS scanners.