Display device and method for manufacturing the same

A display device comprising a red light emitting region, a green light emitting region, and a blue light emitting region, which are distinct from one another when viewed on a plane,

• the display device comprising:
• a base layer;
• a circuit layer on the base layer;
• and
• a display layer comprising a red light emitting element corresponding to the red light emitting region, a green light emitting element corresponding to the green light emitting region, and a blue light emitting element corresponding to the blue light emitting region, and on the circuit layer,
• wherein the red light emitting element, the green light emitting element, and the blue light emitting element each comprise a hole transport region, an emission layer, and an electron transport region which are sequentially stacked,
• one or two of the light emitting elements selected from the red light emitting element, the green light emitting element, and the blue light emitting element are inorganic light emitting elements comprising quantum dots in the emission layer, and the other light emitting elements are organic light emitting elements comprising an organic light emitting material in the emission layer, and
• the inorganic light emitting element or the organic light emitting element comprises a protection layer between the emission layer and the electron transport region and comprising a polar polymer.

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

• forming a circuit layer on a base layer;
• and
• forming a display layer comprising a pixel defining layer having a plurality of pixel openings defined on the circuit layer, and an inorganic light emitting element and an organic light emitting element which are separated by the pixel defining layer,
• wherein the forming of the display layer comprises:
• sequentially providing a hole transport region, an inorganic emission layer including quantum dots, and an electron transport region in at least one of the pixel openings through a method of inkjet printing to form the inorganic light emitting element;
• and
• sequentially providing the hole transport region, an organic emission layer comprising an organic light emitting material, and the electron transport region in the other pixel openings through a method of inkjet printing to form the organic light emitting element, and
• the forming of the inorganic light emitting element or the forming of the organic light emitting element includes providing a protection layer ink between the inorganic emission layer and the electron transport region or between the organic emission layer and the electron transport region through a method of inkjet printing to form a protection layer, and the protection layer ink comprises a polar polymer and a polar organic solvent.