Manufacturing method of display device and display device
According to one embodiment, a manufacturing method of a display device includes forming a lower electrode, forming an organic layer on the lower electrode, and forming an upper electrode on the organic layer. The forming the organic layer includes a process of forming a first blocking layer, a process of forming a first light emitting layer on the first blocking layer, and a process of forming a second blocking layer on the first light emitting layer. A spread angle of a material for forming the first light emitting layer is less than a spread angle of a material for forming the first blocking layer. A spread angle of a material for forming the second blocking layer is greater than the spread angle of the material for forming the first light emitting layer.
1 . A manufacturing method of a display device, comprising:
preparing a processing substrate by forming a lower electrode above a substrate, forming a rib comprising an aperture overlapping the lower electrode, and forming a partition including a lower portion located on the rib and an upper portion located on the lower portion and protruding from a side surface of the lower portion; and
carrying the processing substrate into an evaporation device without providing a mask, forming an organic layer on the lower electrode, forming an upper electrode on the organic layer, and carrying the processing substrate out of the evaporation device, wherein
the forming the organic layer comprises:
forming a first blocking layer,
forming a first light emitting layer on the first blocking layer, and
forming a second blocking layer on the first light emitting layer,
a spread angle of a material for forming the first light emitting layer is less than a spread angle of a material for forming the first blocking layer, and
a spread angle of a material for forming the second blocking layer is greater than the spread angle of the material for forming the first light emitting layer.
2 . The manufacturing method of claim 1 , wherein
the first blocking layer is an electron blocking layer,
the forming the organic layer further comprises, before forming the first blocking layer, forming a hole injection layer on the lower electrode, and forming a hole transport layer on the hole injection layer, and
the spread angle of the material for forming the first blocking layer is greater than a spread angle of a material for forming each of the hole injection layer and the hole transport layer.
3 . The manufacturing method of claim 1 , wherein
the second blocking layer is a hole blocking layer,
the forming the organic layer further comprises, after forming the second blocking layer, forming an electron transport layer on the second blocking layer, and forming an electron injection layer on the electron transport layer, and
a spread angle of a material for forming each of the electron transport layer and the electron injection layer is greater than the spread angle of the material for forming the first light emitting layer.
4 . The manufacturing method of claim 3 , wherein
a spread angle of a material for forming the upper electrode is greater than the spread angle of the material for forming the electron injection layer, and
the upper electrode is in contact with the lower portion of the partition.
5 . The manufacturing method of claim 1 , wherein
the forming the organic layer further comprises forming a second light emitting layer on the first light emitting layer after forming the first light emitting layer and before forming the second blocking layer,
the second light emitting layer is formed of a material which is different from the first light emitting layer and which emits light exhibiting a color similar to the first light emitting layer,
a spread angle of a material for forming the second light emitting layer is less than the spread angle of the material for forming the first blocking layer, and
the spread angle of the material for forming the second blocking layer is greater than the spread angle of the material for forming the second light emitting layer.
6 . The manufacturing method of claim 1 , wherein
the forming the organic layer further comprises, after forming the first light emitting layer and before forming the second blocking layer, forming a carrier generation layer on the first light emitting layer, and forming a second light emitting layer on the carrier generation layer,
the second light emitting layer is formed of a material which is different from the first light emitting layer and which emits light exhibiting a color similar to the first light emitting layer,
a spread angle of a material for forming each of the carrier generation layer and the second light emitting layer is less than the spread angle of the material for forming the first blocking layer, and
the spread angle of the material for forming the second blocking layer is greater than the spread angle of the material for forming each of the carrier generation layer and the second light emitting layer.
7 . The manufacturing method of claim 1 , further comprising forming a transparent cap layer after forming the upper electrode.
8 . The manufacturing method of claim 7 , wherein
in the processing substrate carried out of the evaporation device, the organic layer, the upper electrode and the cap layer formed on the partition are spaced apart from the organic layer, the upper electrode and the cap layer formed on the lower electrode in the aperture.
9 . The manufacturing method of claim 8 , further comprising forming a sealing layer by an inorganic insulating material after forming the cap layer, wherein
the sealing layer covers the cap layer on the partition, covers the cap layer immediately above the lower electrode, and is in contact with the lower portion of the partition.
10 . The manufacturing method of claim 9 , further comprising:
forming a patterned resist on the sealing layer after forming the sealing layer;
removing the sealing layer exposed from the resist;
removing the cap layer exposed from the resist;
removing the upper electrode exposed from the resist; and
removing the organic layer exposed from the resist.
11 . A display device comprising:
a substrate;
a lower electrode provided above the substrate;
a rib formed of an inorganic insulating material and comprising an aperture overlapping the lower electrode;
a partition comprising a lower portion which is provided on the rib and is formed of a conductive material, and an upper portion which is provided on the lower portion and protrudes from a side surface of the lower portion;
an organic layer provided on the lower electrode in the aperture;
an upper electrode which is provided on the organic layer and is in contact with the lower portion of the partition;
a cap layer provided on the upper electrode; and
a sealing layer which covers the cap layer and is in contact with the lower portion of the partition, wherein
the organic layer comprises a first light emitting layer, a first blocking layer located between the lower electrode and the first light emitting layer, and a second blocking layer located between the upper electrode and the first light emitting layer,
the first light emitting layer is spaced apart from the partition, and
the first blocking layer and the second blocking layer are in contact with each other between the partition and the first light emitting layer.
12 . The display device of claim 11 , wherein
the first blocking layer is an electron blocking layer,
the organic layer further comprises a hole injection layer provided on the lower electrode, and a hole transport layer provided on the hole injection layer,
the hole injection layer and the hole transport layer are spaced apart from the partition, and
the first blocking layer is in contact with the rib between the partition and the hole injection layer and between the partition and the hole transport layer.
13 . The display device of claim 12 , wherein
the second blocking layer is a hole blocking layer,
the organic layer further comprises an electron transport layer provided on the second blocking layer, and an electron injection layer provided on the electron transport layer, and
the upper electrode is provided on the electron injection layer.
14 . The display device of claim 11 , wherein
the organic layer further comprises a second light emitting layer provided on the first light emitting layer,
the second light emitting layer is formed of a material which is different from the first light emitting layer and which emits light exhibiting a color similar to the first light emitting layer,
the second light emitting layer is spaced apart from the partition, and
the first blocking layer and the second blocking layer are in contact with each other between the partition and the second light emitting layer.
15 . The display device of claim 11 , wherein
the organic layer further comprises a carrier generation layer provided on the first light emitting layer, and a second light emitting layer provided on the carrier generation layer,
the second light emitting layer is formed of a material which is different from the first light emitting layer and which emits light exhibiting a color similar to the first light emitting layer,
the carrier generation layer and the second light emitting layer are spaced apart from the partition, and
the first blocking layer and the second blocking layer are in contact with each other between the partition and the carrier generation layer and between the partition and the second light emitting layer.