A display device comprising: first to third blue light-emitting elements (200a, 200b, 200c) arranged in parallel to each other, each being configured to emit blue light; an encapsulation layer disposed on and surrounding the first to third blue light-emitting elements (200, 200b, 200c), the first to third blue light-emitting elements (200a, 200b, 200c) being spaced apart from each other; a base member disposed on the encapsulation layer; a red light-emitting quantum dot layer disposed on the base member corresponding to the first blue light-emitting element and configured to convert the blue light into a red light having a main peak in a wavelength area of 610 nm to 750 nm; a red filter on the top surface of the red light-emitting quantum dot layer; a green light-emitting phosphor layer spaced apart from the red light-emitting quantum dot layer, configured to convert the blue light emitted by the corresponding blue light-emitting element into green light and provided on a second portion of the base member corresponding to the second blue light-emitting element; a green filter disposed on the top surface of the green light-emitting phosphor layer; a blue filter disposed on the top surface of the base member and at a position corresponding to a region in which the red light-emitting quantum dot layer and the green light-emitting phosphor layer are not disposed and corresponding to the third blue light-emitting element; and a substrate disposed under the first to third blue light-emitting elements (200a, 200b, 200c) and comprising thin film transistors (Tr) electrically connected to the first to third blue light-emitting elements (200a, 200, 200c), respectively, wherein the phosphor of the green light-emitting phosphor layer has a narrow full width at half maximum, FWHM, of 30 nm to 100 nm and includes at least one phosphor selected from the group consisting of beta-SiAION-based phosphor, LSN-based phosphor, and LUAG-based phosphor, and wherein the first to third blue light-emitting elements (200a, 200b, 200c) comprise a first electrode, an emission layer on the first electrode, and a second electrode on the emission layer, the emission layer of each of the first to third blue light-emitting elements (200a, 200b, 200c) being spaced apart from each other to independently emit the blue light. first to third blue light-emitting elements (200a, 200b, 200c) arranged in parallel to each other, each being configured to emit blue light; an encapsulation layer disposed on and surrounding the first to third blue light-emitting elements (200, 200b, 200c), the first to third blue light-emitting elements (200a, 200b, 200c) being spaced apart from each other; a base member disposed on the encapsulation layer; a red light-emitting quantum dot layer disposed on the base member corresponding to the first blue light-emitting element and configured to convert the blue light into a red light having a main peak in a wavelength area of 610 nm to 750 nm; a red filter on the top surface of the red light-emitting quantum dot layer; a green light-emitting phosphor layer spaced apart from the red light-emitting quantum dot layer, configured to convert the blue light emitted by the corresponding blue light-emitting element into green light and provided on a second portion of the base member corresponding to the second blue light-emitting element; a green filter disposed on the top surface of the green light-emitting phosphor layer; a blue filter disposed on the top surface of the base member and at a position corresponding to a region in which the red light-emitting quantum dot layer and the green light-emitting phosphor layer are not disposed and corresponding to the third blue light-emitting element; and a substrate disposed under the first to third blue light-emitting elements (200a, 200b, 200c) and comprising thin film transistors (Tr) electrically connected to the first to third blue light-emitting elements (200a, 200, 200c), respectively, wherein the phosphor of the green light-emitting phosphor layer has a narrow full width at half maximum, FWHM, of 30 nm to 100 nm and includes at least one phosphor selected from the group consisting of beta-SiAION-based phosphor, LSN-based phosphor, and LUAG-based phosphor, and wherein the first to third blue light-emitting elements (200a, 200b, 200c) comprise a first electrode, an emission layer on the first electrode, and a second electrode on the emission layer, the emission layer of each of the first to third blue light-emitting elements (200a, 200b, 200c) being spaced apart from each other to independently emit the blue light.