Organic EL display

• US 9,929,370 B2
• Filed: 03/07/2016
• Issued: 03/27/2018
• Est. Priority Date: 11/17/2009
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Unified Innovative Technology, LLC
• Inventors: Nakamura, Hideyo
• Primary Examiner(s): Li, Meiya
• Application Number:
  US15/063,008
• Publication Number:
  US 20160190508A1
• Time in Patent Office: 750 Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

An organic electro-luminescent (EL) display can have a reduced optical loss and high efficiency, and can be manufactured by an inexpensive method. The organic EL display can be formed by bonding an organic EL element substrate including a substrate, reflective electrode, organic EL layer, separation wall, barrier layer, transparent electrode, and color conversion layer; and a sealing substrate together, wherein: the reflective electrode includes a plurality of partial electrodes; the organic EL layer is formed on the reflective electrode and includes a plurality of parts separated by the separation wall; the transparent electrode is formed on the organic EL layer; the barrier layer covers the separation wall and the transparent electrode, and has a recessed part in a location corresponding to the reflective electrode; and the color conversion layer is formed in the recessed part.

Claims

1. An organic electro-luminescent (EL) display comprising:

a substrate;

a reflective electrode and an auxiliary wiring on the substrate, the reflective electrode and the auxiliary wiring being spaced apart from each other;

an insulating film on the reflective electrode and the auxiliary wiring, the insulating film comprising a first opening to open at least a portion of the reflective electrode and a second opening to open at least a portion of the auxiliary wiring;

an organic EL layer on the reflective electrode to contact the at least a portion of reflective electrode through the first opening, the organic EL layer being insulated from the auxiliary wiring;

a separation wall on the insulating film, the separation wall being provided such that the at least a portion of the auxiliary wiring is exposed through the second opening;

a transparent electrode on the organic EL layer, the transparent electrode connected with the at least a portion of the auxiliary wiring through the second opening;

a barrier layer on the transparent electrode; and

a color conversion layer on the barrier layer,

wherein;

the reflective electrode is constituted of a plurality of partial electrodes;

the organic EL layer is constituted of a plurality of parts that are separated by the separation wall;

the barrier layer covers the separation wall and the transparent electrode, and has a recessed part in a location corresponding to the reflective electrode; and

the color conversion layer is formed in the recessed part.

2. The organic EL display according to claim 1, wherein:

the separation wall has a plurality of openings respectively corresponding to the plurality of partial electrodes that constitute the reflective electrode; and

the organic EL layer is formed in the plurality of openings.

3. The organic EL display according to claim 1, wherein:

the separation wall is constituted of a plurality of first striped parts, each of the plurality of the first striped parts being arranged in respective gaps between the plurality of partial electrodes constituting the reflective electrode and extend in one direction; and

the organic EL layer is formed in a gap of the separation wall.

4. The organic EL display according to claim 3, wherein the transparent electrode is constituted of a plurality of second striped parts that are separated by the separation wall.

5. The organic EL display according to claim 4, wherein applied voltage is individually controlled for each of the plurality of striped parts of the transparent electrode.

6. The organic EL display according to claim 4, wherein an electrical characteristic can be measured for each of the plurality of striped parts of the transparent electrode.

7. The organic EL display according to claim 1, wherein the reflective electrode and the auxiliary wiring are formed of a same material on a same layer.

8. The organic EL display according to claim 1, further comprising a first underlying layer under the reflective electrode and a second underlying layer under the auxiliary wiring, each of the first underlying layer and the second underlying layer being formed of a same conductive material on a same layer.

9. The organic EL display according to claim 1, wherein the insulating film covers a shoulder part of the reflective electrode to form the first opening and a shoulder part of the auxiliary wiring to form the second opening.

10. The organic EL display according to claim 1, wherein the organic EL layer is further provided between an upper surface of the separation wall and a lower surface of the transparent electrode.

11. The organic EL display according to claim 1, wherein the transparent electrode is further provided on upper and side surfaces of the separation wall, and the plurality of parts of the organic EL layer is not in contact with the separation wall by the transparent electrode.

12. The organic EL display according to claim 1, wherein the separation wall comprises a metallic material.

13. The organic EL display according to claim 1, wherein the separation wall has a height of about 1.5 μ

m to 3 μ

m for a separation of the organic EL layer and a connection of the auxiliary wiring with the transparent electrode.

14. The organic EL display according to claim 1, wherein the barrier layer has a refraction index equivalent to that of the transparent electrode, and the color conversion layer has a refraction index equal to or more than that of the barrier layer.

15. The organic EL display according to claim 1, further comprising a protective layer provided on the color conversion layer to prevent the color conversion layer from being deteriorated.

16. The organic EL display according to claim 1, further comprising a sealing substrate to face the substrate and a spacer between the substrate and the sealing substrate, wherein the sealing substrate comprises a color filter and a black matrix, and the spacer is provided on an upper surface of the barrier layer.

17. The organic EL display according to claim 16, wherein the sealing substrate and the substrate are bonded in a circumferential edge part to form a bonding gap between the sealing substrate and the substrate, and material having a refractive index of 1.3 or more is filled in the bonding gap.

18. The organic EL display according to claim 1, further comprising an insulating film barrier layer covering the insulating film to prevent outgas from penetrating from the insulating film into the organic EL layer.