Organic EL display panel

Patent metadata

Field	Value
Publication number	US-10749134-B2
Application number	US-201916384424-A
Country	US
Kind code	B2
Filing date	Apr 15, 2019
Priority date	Apr 24, 2018
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

The pixels of an organic EL display panel each include an anode electrode layer, an organic layer, and a cathode electrode layer. Each of the organic layer and the cathode electrode layer is shared by the plurality of pixels. An organic EL element in each of the pixels includes an anode section, a cathode section, and a light emitting section. A conductor layer having a recess is provided in a region outside a region of the organic EL element in a view from a light exiting direction in which the organic EL element emits light. The recess includes a coated section that is covered with the organic layer and a conductor exposed section where the conductor layer is exposed. The cathode electrode layer is connected to part of the conductor exposed section.

First claim

The invention claimed is:

1. An organic electro luminescence (EL) display panel comprising:
a plurality of pixels,
wherein the plurality of pixels each include an anode electrode layer, an organic layer, and a cathode electrode layer, the organic layer having an area greater than an area of the anode electrode layer, at least part of the organic layer covering the anode electrode layer, at least part of the cathode electrode layer covering the organic layer,
each of the organic layer and the cathode electrode layer is continuously shared by the plurality of pixels,
the plurality of pixels each include at least one organic EL element,
the at least one organic EL element includes an anode section that is part of the anode electrode layer, a cathode section that is part of the cathode electrode layer, and a light emitting section that is part of the organic layer and located between the anode section and the cathode section,
the organic EL display panel further includes a conductor layer having a recess, the conductor layer being located in a region outside a region of the at least one organic EL element in a view from a light exiting direction in which the at least one organic EL element emits light,
the recess in the conductor layer includes a coated section and a conductor exposed section, the coated section being covered with the organic layer, the conductor exposed section not being covered with the organic layer, the conductor exposed section exposing the conductor layer, and
the cathode electrode layer is connected to at least part of the conductor exposed section.

2. The organic EL display panel according to claim 1 ,
wherein the coated section includes part of the organic layer, the part of the organic layer covering (i) part of a side surface of the recess and (ii) a bottom surface of the recess that is continuous with the part of the side surface, and
the cathode electrode layer is disposed on the part of the organic layer serving as the coated section, the cathode electrode layer being connected to the conductor exposed section.

3. The organic EL display panel according to claim 1 ,
wherein the recess has a rectangular shape in a view from the light exiting direction and includes four side surfaces,
the conductor exposed section is located on one or more to three or less of the four side surfaces, and
the coated section is located on at least one of the four side surfaces excluding a region serving as the conductor exposed section.

4. The organic EL display panel according to claim 3 ,
wherein in a cross-sectional view of the recess taken along a plane parallel to the light exiting direction, a surface of the organic layer in the coated section is less steep than the one or more to three or less of the four side surfaces where the coated section is located.

5. The organic EL display panel according to claim 1 , further comprising:
a thin film transistor (TFT) layer disposed above a TFT substrate;
an EL layer including the anode electrode layer, the organic layer, and the cathode electrode layer; and
an interlayer insulating layer located between the TFT layer and the EL layer,
wherein the conductor layer is a metal layer comprising a same metal as a metal of a power source line in the TFT layer, and
the coated section includes part of the interlayer insulating layer and part of the organic layer.

6. The organic EL display panel according to claim 5 , further comprising:
one of a semiconductor material layer and a different conductor layer between the conductor layer and the TFT substrate, the different conductor layer being different from the conductor layer.

7. The organic EL display panel according to claim 5 , further comprising:
a different conductor layer between the conductor layer and the TFT substrate, the different conductor layer being different from the conductor layer,
wherein the conductor layer is connected to the different conductor layer.

8. The organic EL display panel according to claim 1 ,
wherein the conductor layer is a layer containing a material of the anode electrode layer, and the conductor layer is not connected to the anode electrode layer.

9. An organic electro luminescence (EL) display panel comprising:
a plurality of pixels arranged in a matrix along a first direction and a second direction that intersects the first direction,
wherein the plurality of pixels each include a plurality of sub-pixels having different colors, the plurality of sub-pixels of the plurality of pixels being arranged along the first direction,
the plurality of sub-pixels each include an anode electrode layer, an organic layer, an organic common layer, and a cathode electrode layer, at least part of the organic layer covering the anode electrode layer, the organic common layer having an area greater than an area of each of the anode electrode layer and the organic layer, at least part of the organic common layer covering the organic layer, the cathode electrode layer having an area greater than the area of each of the anode electrode layer and the organic layer, and at least part of the cathode electrode layer covering the organic common layer,
each of the organic common layer and the cathode electrode layer is continuously shared by at least adjacent sub-pixels adjacent to each other in the first direction among the plurality of sub-pixels,
the plurality of sub-pixels each include an organic EL element,
the organic EL element includes an anode section that is part of the anode electrode layer, a cathode section that is part of the cathode electrode layer, a light emitting section that is part of the organic layer and located between the anode section and the cathode section, and an interlayer organic section that is part of the organic common layer and located between the light emitting section and the cathode section,
the organic EL display panel further includes a conductor layer having a recess, the conductor layer being located between at least two of the plurality of pixels arranged in the first direction,
the recess in the conductor layer includes a coated section and a conductor exposed section, the coated section being covered with the organic common layer, the conductor exposed section not being covered with the organic common layer, the conductor exposed section exposing the conductor layer, and
the cathode electrode layer is connected to at least part of the conductor exposed section.

10. The organic EL display panel according to claim 9 ,
wherein the organic EL element is not present on an axial line parallel to the second direction and passing through the recess when viewed in a direction perpendicular to both the first direction and the second direction.

11. The organic EL display panel according to claim 9 ,
wherein the plurality of sub-pixels include a plurality of same-color sub-pixels that output light having a same color,
the plurality of same-color sub-pixels are arranged along the second direction, and
the organic common layer is continuously shared by at least two of the same-color sub-pixels arranged in the second direction.

Assignees

• Joled Inc

Inventors

• Yamamoto Tetsuro
• Hiromasu Yasunobu

Classifications

• H10K59/80521

  characterised by their shape · CPC title

• H10K50/82

  Cathodes · CPC title

• H10K59/131 Primary

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title