A display device (1000, 1100A, 1100B, 1700A, 1800A, 1800B) comprising: a waveguide (260, 1012) configured to guide light in a lateral direction parallel to an output surface of the waveguide, the waveguide further configured to outcouple the guided light through the output surface; and a broadband adaptive lens assembly (1004, 1008, 1150A, 2300, 2400, 2400A, 2400B) configured to incouple and to diffract therethrough the outcoupled light from the waveguide, the broadband adaptive lens assembly comprising a first waveplate lens (1154A, 1704, 1804, 2204, 2308) comprising a liquid crystal layer arranged such that the first waveplate lens has birefringence (Δn) that varies in a radially outward direction from a central region of the first waveplate lens, and configured to diffract the outcoupled light at a diffraction efficiency greater than 90% within a wavelength range including at least 450 nm to 630 nm, wherein a radial arrangement of the Δn of the first waveplate lens, resulting from liquid crystal molecules of the LC layer at a given radius from a central axis of the first waveplate lens having substantially the same angle of rotation, is such that the first waveplate lens radially converges light having a first polarization while radially diverging light having a second polarization opposite the first polarization, wherein the Δn of the first waveplate lens (1154A, 1704, 1804, 2204, 2308) increases with increasing wavelength (λ) within the wavelength range, and wherein the broadband adaptive lens assembly is configured to be selectively switched between a plurality of states having different optical powers. a waveguide (260, 1012) configured to guide light in a lateral direction parallel to an output surface of the waveguide, the waveguide further configured to outcouple the guided light through the output surface; and a broadband adaptive lens assembly (1004, 1008, 1150A, 2300, 2400, 2400A, 2400B) configured to incouple and to diffract therethrough the outcoupled light from the waveguide, the broadband adaptive lens assembly comprising a first waveplate lens (1154A, 1704, 1804, 2204, 2308) comprising a liquid crystal layer arranged such that the first waveplate lens has birefringence (Δn) that varies in a radially outward direction from a central region of the first waveplate lens, and configured to diffract the outcoupled light at a diffraction efficiency greater than 90% within a wavelength range including at least 450 nm to 630 nm, wherein a radial arrangement of the Δn of the first waveplate lens, resulting from liquid crystal molecules of the LC layer at a given radius from a central axis of the first waveplate lens having substantially the same angle of rotation, is such that the first waveplate lens radially converges light having a first polarization while radially diverging light having a second polarization opposite the first polarization, wherein the Δn of the first waveplate lens (1154A, 1704, 1804, 2204, 2308) increases with increasing wavelength (λ) within the wavelength range, and wherein the broadband adaptive lens assembly is configured to be selectively switched between a plurality of states having different optical powers.