Electroluminescence display device

Patent metadata

Field	Value
Publication number	US-2016111474-A1
Application number	US-201514978639-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Oct 23, 2012
Publication date	Apr 21, 2016
Grant date	—

Abstract

There is provided an EL display device of a color filter system which obtains sufficient brightness and contrast while making it difficult to generate a color mixture even if pixels become fine. An EL display device 100 according to the present invention includes a first substrate 1 , a circuit layer 2 formed on the first substrate 1 , a color selection reflection layer 11 formed in an upper layer of the circuit layer 2 , lower electrodes 5 formed in an upper layer of the color selection reflection layer 11 , a white light emission EL layer 7 formed in an upper layer of the lower electrodes 5 , an upper electrode 8 formed in an upper layer of the EL layer 7 , and a sealing layer 9 formed in an upper layer of the upper electrode 8.

First claim

1 . An EL display device comprising:
a substrate; a first pixel including a first lower electrode on the substrate; a second pixel including a second lower electrode on the substrate and being adjacent to the first pixel in a first direction; a pixel separation film on the substrate having a first part which is located on a boundary between the first pixel and the second pixel; an upper electrode located above the first lower electrode and the second lower electrode; and an auxiliary electrode on the upper electrode having a second part which is located on the boundary, wherein the first pixel has an area which does not overlap the auxiliary electrode, the second pixel has an area which does not overlap the auxiliary electrode, the second part covers the first part in a planer view, and the second part is wider than the first part in the first direction.

2 . The EL display device according to claim 1 , wherein the second part has a first region, a second region, and a third region,
the first region overlaps the first lower electrode, and does not overlap the second lower electrode and the first part, the second region overlaps the second lower electrode, and does not overlap the first lower electrode and the first part, and the third region overlaps the first part, and does not overlap the first lower electrode and the second lower electrode.

3 . The EL display device according to claim 1 , wherein an electro luminescence layer is located between the first lower electrode and the upper electrode, and
the second part has a region which overlaps the first lower electrode and the electro luminescence layer, and does not overlap the first part in a planer view.

4 . The EL display device according to claim 1 , wherein the auxiliary electrode is formed of a conductive metal film.

5 . The EL display device according to claim 4 , wherein the conductive metal film is made of silver or aluminum.

6 . The EL display device according to claim 1 , wherein a material of the auxiliary electrode is different from a material of the upper electrode.

7 . The EL display device according to claim 1 , wherein the auxiliary electrode has a surface facing the upper electrode,
an electro luminescence layer is located between the first lower electrode and the upper electrode, the electro luminescence layer emits a light, and the surface reflects the light toward the first lower electrode.

8 . The EL display device according to claim 7 , further comprising a reflection layer between the first lower electrode and the substrate,
wherein the reflection layer reflects the light toward the upper electrode.

9 . The EL display device according to claim 1 , wherein the pixel separation film has a first aperture area and a second aperture area,
the first aperture area exposes the first lower electrode, the second aperture area exposes the second lower electrode, and the auxiliary electrode overlaps a part of the first aperture area and a part of the second aperture area in a planer view.

10 . An EL display device comprising:
a substrate; a lower electrode on the substrate; an upper electrode on the substrate; an electro luminescence layer between the lower electrode and the upper electrode; a pixel separation film having an aperture area, the aperture area exposing a part of the lower electrode; and an auxiliary electrode on the upper electrode, wherein the auxiliary electrode has a first region and a second region, the first region overlaps a part of the aperture area in a planer view, the second region overlaps the pixel separation film in a planer view, and the auxiliary electrode does not overlap an entirety of the aperture area.

11 . The EL display device according to claim 10 , wherein the second region does not overlap the aperture area in a planer view.

12 . The EL display device according to claim 10 , wherein the auxiliary electrode is formed of a conductive metal film.

13 . The EL display device according to claim 10 , wherein a material of the auxiliary electrode is different from a material of the upper electrode.

14 . The EL display device according to claim 10 , wherein the auxiliary electrode has a surface facing the upper electrode,
the electro luminescence layer emits a light, and the surface reflects the light toward the lower electrode.

15 . The EL display device according to claim 10 , wherein the pixel separation film has a first width which extends in a first direction,
the auxiliary electrode has a second width which extends in the first direction, and the second width is wider than the first width.

16 . The EL display device according to claim 15 , further comprising:
a first pixel including the lower electrode; a second pixel adjacent to the first pixel in the first direction, wherein the pixel separation film has an area corresponding to the first width, the area extend from the first pixel to the second pixel continuously.

Assignees

• Japan Display Inc

Inventors

• Sato Toshihiro
• Toyoda Hironori
• Fujiyoshi Jun

Classifications

• H10K2102/3026

  Top emission · CPC title

• H10K59/32

  Stacked devices having two or more layers, each emitting at different wavelengths · CPC title

• H10K59/131

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

• H10K59/8052

  Cathodes · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title