A device for providing a line of an image in angular domain, the device comprising a low-mode waveguide comprising: an in-coupler for coupling image light from a light source into the low-mode waveguide; a 1xN splitter for splitting the image light coupled by the in-coupler into N linear waveguides; N phase shifters each coupled to a particular one of the N linear waveguides for delaying image light portions propagating therein by a controllable amount; an array of N linear waveguide emitters each coupled to a particular one of the N phase shifters for emitting the image light portions delayed thereby; and a slab waveguide portion coupled to the array of N linear waveguide emitters for propagating therein the delayed image light portions emitted by corresponding emitters of the array of N linear waveguide emitters, wherein N is an integer; wherein the slab waveguide portion comprises a single mode slab waveguide or a few-mode slab waveguide supporting no more than 10 lateral modes of propagation; characterized in that the slab waveguide portion further comprises a field of view, FOV, expander in the slab waveguide portion; the FOV expander comprises a tunable cladding portion (1339, 1340) evanescently coupled to a core of the slab waveguide portion and shaped to deviate light propagated in the core of the slab waveguide portion by a controllable amount; and the tunable cladding portion (1339, 1340) comprises an array of triangular-shaped liquid crystal cladding portions, the array extending laterally w.r.t. an optical path of the image light in the core of the slab waveguide portion, wherein at least some triangular-shaped liquid crystal cladding portions have a side (1339A, 1340A) extending at an acute angle w.r.t. the optical path. an in-coupler for coupling image light from a light source into the low-mode waveguide; a 1xN splitter for splitting the image light coupled by the in-coupler into N linear waveguides; N phase shifters each coupled to a particular one of the N linear waveguides for delaying image light portions propagating therein by a controllable amount; an array of N linear waveguide emitters each coupled to a particular one of the N phase shifters for emitting the image light portions delayed thereby; and a slab waveguide portion coupled to the array of N linear waveguide emitters for propagating therein the delayed image light portions emitted by corresponding emitters of the array of N linear waveguide emitters, wherein N is an integer; wherein the slab waveguide portion comprises a single mode slab waveguide or a few-mode slab waveguide supporting no more than 10 lateral modes of propagation; characterized in that the slab waveguide portion further comprises a field of view, FOV, expander in the slab waveguide portion; the FOV expander comprises a tunable cladding portion (1339, 1340) evanescently coupled to a core of the slab waveguide portion and shaped to deviate light propagated in the core of the slab waveguide portion by a controllable amount; and the tunable cladding portion (1339, 1340) comprises an array of triangular-shaped liquid crystal cladding portions, the array extending laterally w.r.t. an optical path of the image light in the core of the slab waveguide portion, wherein at least some triangular-shaped liquid crystal cladding portions have a side (1339A, 1340A) extending at an acute angle w.r.t. the optical path.