US 12,453,233 B2
Display device having a functional layer for improving display performance
Yang Qu, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/794,603
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Feb. 6, 2020, PCT No. PCT/JP2020/004514
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/156999, PCT Pub. Date Aug. 12, 2021.
Prior Publication US 2023/0071128 A1, Mar. 9, 2023
Int. Cl. H10K 50/115 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/17 (2023.01); H10K 59/122 (2023.01); H10K 59/80 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/171 (2023.02); H10K 59/122 (2023.02); H10K 59/8051 (2023.02)] 17 Claims
OG exemplary drawing
 
1. A display device provided with a display region having a plurality of pixels, and a frame region surrounding the display region, the display device comprising:
a thin-film transistor layer;
a first light-emitting layer including a plurality of light-emitting elements, each including a first electrode, a functional layer, and a second electrode, the plurality of light-emitting elements being configured to emit mutually different colors of light; and
a bank partitioning each of the plurality of pixels in correspondence with each of the plurality of light-emitting elements,
wherein the functional layer contains a functional material that contributes to a function of the functional layer, and an additive added to the functional layer in a predetermined range of an additive amount and having a smaller size than the functional material,
the first electrode is provided in an island form in correspondence with each of the plurality of pixels,
the functional layer includes a second light-emitting layer,
the bank forms an edge cover overlapping an end of a surface of the first electrode, having an island shape, to define the pixel,
the second light-emitting layer is provided in an island form inside the edge cover,
the second light-emitting layer is a quantum-dot light-emitting layer including quantum dots,
the quantum-dot light-emitting layer further includes a red quantum-dot light-emitting layer that emits red light, a green quantum-dot light-emitting layer that emits green light, and a blue quantum-dot light-emitting layer that emits blue light,
the additive added to the quantum-dot light-emitting layer has a size that decreases in an order of the red quantum-dot light-emitting layer, the green quantum-dot light-emitting layer, and the blue quantum-dot light-emitting layer based on a size of a corresponding quantum dot, and
the additive is an organic salt.