Display device and method for manufacturing display device

A method for manufacturing a display device, the display device including:

• a display region including a plurality of pixels, and a frame region outside the display region;
• and
• a thin-film transistor layer, a light-emitting-element layer including a plurality of light-emitting elements each emitting a light in a different color, and a sealing layer sealing the light-emitting-element layer,
• at least one of the pixels being provided with:
• a red light-emitting element emitting light a color of which is red;
• a green light-emitting element emitting light a color of which is green;
• and a blue light-emitting element emitting light a color of which is blue, the red light-emitting element, the green light-emitting element, and the blue light-emitting element being included in the light-emitting elements, the method comprising:
• a red application step of applying a red coating liquid to a region of the red light-emitting element, a region of the green light-emitting element, and a region of the blue light-emitting element, the red coating liquid containing red quantum dots emitting the red light, a hole-transport material monomer, and a photopolymerization initiator;
• a red phase-separation step of phase-separating the red coating liquid into a layer containing the red quantum dots and a layer not containing the red quantum dots;
• a red exposure step of exposing, to light, the red coating liquid into a pattern, to solidify a portion, of the red coating liquid, applied to the region of the red light-emitting element;
• a green application step of applying a green coating liquid to the region of the red light-emitting element, the region of the green light-emitting element, and the region of the blue light-emitting element, the green coating liquid containing green quantum dots emitting the green light, a hole-transport material monomer, and a photopolymerization initiator;
• a green phase-separation step of phase-separating the green coating liquid into a layer containing the green quantum dots and a layer not containing the green quantum dots;
• a green exposure step of exposing, to light, the green coating liquid into a pattern, to solidify a portion, of the green coating liquid, applied to the region of the green light-emitting element;
• and
• an intermediate layer forming step of forming an intermediate layer to cover the portion of which the red coating liquid is solidified and the portion of which the green coating liquid is solidified, the intermediate portion containing either blue quantum dots emitting the blue light, or quantum dots a peak emission wavelength of which is shorter than a peak emission wavelength of the blue quantum dots.

A display device, comprising:

• a display region including a plurality of pixels, and a frame region outside the display region;
• and
• a thin-film transistor layer, a light-emitting-element layer including a plurality of light-emitting elements each emitting a light in a different color, and a sealing layer sealing the light-emitting-element layer, wherein
• each of the light-emitting elements includes an anode, a first hole-transport layer, a light-emitting layer containing quantum dots, an electron-transport layer, and a cathode in a stated order,
• one of the anode and the cathode is an island electrode provided for each of the light-emitting elements, and another one of the anode and the cathode is a common electrode provided in common among the light-emitting elements, and
• at least one of the light-emitting elements further includes an intermediate layer provided between the light-emitting layer and the electron-transport layer, and containing quantum dots a peak emission wavelength of which is shorter than a peak emission wavelength of the quantum dots contained in the light-emitting layer, wherein
• the first hole-transport layer of the at least one light-emitting element is formed of a hole-transport-material monomer and a photopolymerization initiator.