Organic light emitting diode array substrate, its manufacturing method, and display device

• US 9,570,533 B2
• Filed: 01/16/2015
• Issued: 02/14/2017
• Est. Priority Date: 09/23/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhang, Can, Liu, Libin
• Primary Examiner(s): YUSHINA, GALINA G
• Application Number:
  US14/758,135
• Publication Number:
  US 20160254341A1
• Time in Patent Office: 760 Days
• US Class Current: 1/1
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

The present disclosure provides an organic light emitting diode array substrate and its manufacturing method, as well as a display device. The organic light emitting diode array substrate includes: gate lines, data lines, and a plurality of pixel units defined by the gate lines and the data lines. Each pixel unit comprises a first region which emits light and a second region which does not emit light. The first region is provided with an organic light emitting diode, and the second region is provided with a conductive unit which is electrically connected in parallel with the data line and created from the same layer from which a cathode of the organic light emitting diode is created.

Claims

1. An organic light emitting diode (OLED) array substrate, comprising:

gate lines, data lines, and a plurality of pixel units defined by the gate lines and the data lines,

wherein each pixel unit comprises a first region which emits light and a second region which does not emit light,

the first region is provided with an organic light emitting diode, and

the second region is provided with a conductive unit, which is electrically connected in parallel with a corresponding data line and created from a same layer from which a cathode of the organic light emitting diode is created.

2. The OLED array substrate according to claim 1, wherein the data line is electrically connected in parallel with the conductive unit through at least two via holes.

3. The OLED array substrate according to claim 1, further comprising a separating portion, through which the cathode is insulated and separated from the conductive unit.

4. The OLED array substrate according to claim 3, wherein the separating portion is of a rectangle frame-like shape, and the conductive unit is arranged inside the separating portion.

5. The OLED array substrate according to claim 3, wherein a top of the separating portion is higher than those of the cathode and the conductive unit.

6. The OLED array substrate according to claim 5, wherein the top of the separating portion is 2 μ

m to 5 μ

m higher than those of the cathode and the conductive unit.

7. The OLED array substrate according to claim 5, wherein the separating portion is columnar and of a cross section in an inverted trapezoidal shape.

8. The OLED array substrate according to claim 1, wherein the conductive unit and the cathode of the organic light emitting diode are each made of a translucent metal material.

9. The OLED array substrate according to claim 8, wherein the translucent metal material is Ag, Mg or Al, or an alloy thereof.

10. The OLED array substrate according to claim 1, wherein the conductive unit and the cathode of the OLED are each of a thickness of 10 nm to 30 nm.

13. An organic light emitting diode (OLED) display device, comprising the OLED array substrate according to claim 1.

14. The OLED display device according to claim 13, wherein the data line is electrically connected in parallel with the conductive unit through at least two via holes.

15. The OLED display device according to claim 13, further comprising a separating portion, through which the cathode is insulated and separated from the conductive unit.

16. The OLED display device according to claim 15, wherein the separating portion is of a rectangle frame-like shape, and the conductive unit is arranged inside the separating portion.

17. The OLED display device according to claim 15, wherein a top of the separating portion is higher than those of the cathode and the conductive unit.

18. The OLED display device according to claim 17, wherein the top of the separating portion is 2 μ

m to 5 μ

m higher than those of the cathode and the conductive unit.

19. The OLED display device according to claim 17, wherein the separating portion is columnar and of a cross section in an inverted trapezoidal shape.

20. The OLED display device according to claim 13, wherein the conductive unit and the cathode of the organic light emitting diode are each made of a translucent metal material.

11. A method for manufacturing an organic light emitting diode (OLED) array substrate, comprising the following steps:

forming gate lines and data lines, and forming a plurality of pixel units defined by the gate lines and the data lines,

wherein each pixel unit comprises a first region which emits light and a second region which does not emit light, the first region is provided with an OLED, and the second region is provided with a conductive unit which is electrically connected in parallel with a corresponding data line and created from a same layer from which a cathode of the OLED is created.

12. The method according to claim 11, wherein the step of forming the plurality of pixel units comprises:

providing a base substrate;

forming an anode of the organic light emitting diode and a pixel-defined layer on the base substrate, and forming a via hole penetrating the pixel-defined layer at a position corresponding to the data line;

forming an organic layer of the OLED on the anode;

forming a separating portion on the pixel-defined layer; and

forming a cathode metal layer having a top lower than that of the separating portion and divided into two parts by the separating portion, one part of the cathode metal layer serving as the cathode of the OLED and another part of the cathode metal serving as the conductive unit which is electrically connected to the data line through the via hole.