Organic light emitting diode display device with micro lenses

• US 10,374,197 B2
• Filed: 10/28/2016
• Issued: 08/06/2019
• Est. Priority Date: 10/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jintae, Kim, Sookang, Jo, Soyoung, Koo, Wonhoe, Jang, Jihyang, Lim, Hyunsoo, Choi, Mingeun
• Primary Examiner(s): Huber, Robert T
• Application Number:
  US15/337,517
• Publication Number:
  US 20170125738A1
• Time in Patent Office: 1,012 Days
• Field of Search: 257 40, 257E51021, 257E33068
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/80515 characterised by their shape
• CPC Class Codes: H10K 59/80521 characterised by their shape
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/878 comprising reflective means
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

Disclosed is an organic light emitting diode display device. The disclosed organic light emitting diode display device includes an overcoat layer disposed on a substrate that is divided into an emissive area and a non-emissive area, and has multiple micro lenses in the emissive area and at least one depression in the non-emissive area. The organic light emitting diode display device further includes: a first electrode disposed on the overcoat layer, wherein the first electrode is disposed in the entire emissive area and in a part of the non-emissive area; a bank pattern disposed in the non-emissive area so as to be superposed on the depression; an organic light emitting layer disposed on the substrate; and a second electrode disposed on the organic light emitting layer. Accordingly, the organic light emitting diode display device may prevent light leakage.

Claims

1. An organic light emitting diode display device comprising:

a substrate divided into an emissive area and a non-emissive area;

an overcoat layer disposed on the substrate and having a plurality of micro lenses in the emissive area and at least one depression in the non-emissive area, each of the plurality of micro lenses comprising a concave portion and a connecting portion;

a thin film transistor disposed in the non-emissive area and covered by the overcoat layer;

a first electrode disposed on the overcoat layer and connected to the thin film transistor through a contact hole formed in the overcoat layer;

a bank pattern disposed in the non-emissive area so as to be superposed on the at least one depression and the contact hole;

an organic light emitting layer disposed on the first electrode; and

a second electrode disposed on the organic light emitting layer,

wherein each of the first electrode, the organic light emitting layer and the second electrode has a shape according to the plurality of micro lenses in the emissive area,

wherein the at least one depression has a different shape from a shape of the concave portion, and

wherein the at least one depression surrounds the emissive area in a plan view.

2. The organic light emitting diode display device of claim 1, wherein the bank pattern is disposed to fill the at least one depression.

3. The organic light emitting diode display device of claim 2, wherein the bank pattern is formed of an opaque organic material.

4. The organic light emitting diode display device of claim 1, wherein a height of the at least one depression is less than a vertical length of the overcoat layer in the non-emissive area.

5. The organic light emitting diode display device of claim 1, wherein a height of the at least one depression is the same as a vertical length of the overcoat layer in the non-emissive area.

6. The organic light emitting diode display device of claim 1, wherein the first electrode is disposed within the at least one depression, and the bank pattern is disposed on the first electrode.

7. The organic light emitting diode display device of claim 6, wherein the organic light emitting layer and the second electrode are disposed on the bank pattern, and the second electrode is a reflective electrode.

8. The organic light emitting diode display device of claim 1, wherein the overcoat layer has at least one step in the non-emissive area or in the emissive area adjacent to the non-emissive area.

9. The organic light emitting diode display device of claim 8, wherein the overcoat layer comprises a protruding portion provided between the at least one step and the at least one depression located adjacent to the at least one step, and a height from the concave portion to the connecting portion of each of the plurality of micro lenses is less than a height from the concave portion of each of the plurality of micro lenses to the protruding portion of the overcoat layer.

10. The organic light emitting diode display device of claim 9, wherein the position of a first organic light emitting element disposed on the connecting portion is lower than that of the first electrode of a second organic light emitting element disposed on the protruding portion.

11. The organic light emitting diode display device of claim 9, wherein the first electrode of the second organic light emitting element extends to at least a part of the protruding portion.

12. The organic light emitting diode display device of claim 11, wherein the first electrode of the second organic light emitting element is a reflective electrode.

13. The organic light emitting diode display device of claim 11, wherein the first electrode of the second organic light emitting element is formed of a transparent conductive material, and a reflective layer is disposed below the first electrode of the second organic light emitting element in the same form as that of the first electrode.

14. The organic light emitting diode display device of claim 1, wherein the first electrode is further disposed on the at least one depression and has a shape according to the at least one depression in the non-emissive area.

15. The organic light emitting diode display device of claim 14, wherein the bank pattern is disposed between the first electrode and the organic light emitting layer in the non-emissive area.