Electroluminescence display device

Patent metadata

Field	Value
Publication number	US-9614011-B2
Application number	US-201514978639-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Oct 23, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

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

The invention claimed is:

1. An EL display device comprising:
a substrate;
a pixel including a lower electrode on the substrate;
another pixel including another lower electrode on the substrate and being adjacent to the pixel in a horizontal direction in a cross-sectional view;
a pixel separation film provided on the substrate and having a part which has a length in the horizontal direction and is located on a boundary between the pixel and the another pixel,
an upper electrode located above the lower electrode and the another lower electrode; and
a patterned auxiliary electrode provided on the upper electrode and having another length in the horizontal direction, wherein the patterned auxiliary electrode is located on the boundary,
wherein the pixel has an area which does not overlap the patterned auxiliary electrode,
the another pixel has another area which does not overlap the patterned auxiliary electrode,
the patterned auxiliary electrode covers the part of the pixel separation film, and
the another length is longer than the length.

2. The EL display device according to claim 1 , wherein the patterned auxiliary electrode comprises:
a region which overlaps the lower electrode, and does not overlap the another lower electrode and the part;
another region which overlaps the another lower electrode, and does not overlap the lower electrode and the part; and
another region which overlaps the part, and does not overlap the lower electrode and the another lower electrode.

3. The EL display device according to claim 1 , wherein an electro luminescence layer is located between the lower electrode and the upper electrode, and
the patterned auxiliary electrode has an area which overlaps the lower electrode and the electro luminescence layer, and does not overlap the part.

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

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

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

9. The EL display device according to claim 1 , wherein the pixel separation film has a aperture area which exposes the lower electrode and another aperture area which exposes the another lower electrode, and
the patterned auxiliary electrode overlaps a part of the aperture area and another part of the another aperture area.

10. The EL display device according to claim 9 , wherein the aperture area has a portion which does not overlap the patterned auxiliary electrode, and
the another aperture area has another portion which does not overlap the patterned auxiliary electrode.

11. 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
a patterned auxiliary electrode on the upper electrode,
wherein the patterned auxiliary electrode has a region that does not overlap the pixel separation film and another region that overlaps the pixel separation film,
the region overlaps a part of the aperture area, and
the aperture area has a portion which does not overlap the patterned auxiliary electrode.

12. The EL display device according to claim 11 , wherein the another region does not overlap the aperture area.

13. The EL display device according to claim 11 , wherein the patterned auxiliary electrode is formed of a conductive metal film.

14. The EL display device according to claim 11 , wherein a material of the patterned auxiliary electrode is different from a material of the upper electrode.

15. The EL display device according to claim 11 , wherein the patterned auxiliary electrode has a surface facing the upper electrode,
the electro luminescence layer emits light, and
the surface reflects the light toward the lower electrode.

16. The EL display device according to claim 11 , wherein the pixel separation film has a width which extends in a horizontal direction in a cross-sectional view,
the patterned auxiliary electrode has another width which extends in the horizontal direction, and
the another width is wider than the width.

17. The EL display device according to claim 16 , further comprising:
a pixel including the lower electrode;
another pixel adjacent to the pixel in the horizontal direction,
wherein the pixel separation film has an area corresponding to the width, the area extended from the pixel to the another 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