OLED device, method for driving OLED device, OLED substrate, method for manufacturing OLED substrate and display device

• US 10,516,129 B2
• Filed: 05/22/2018
• Issued: 12/24/2019
• Est. Priority Date: 11/21/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Liao, Chinlung, Hu, Yue
• Primary Examiner(s): Nicely, Joseph C.
• Application Number:
  US15/986,067
• Publication Number:
  US 20190157597A1
• Time in Patent Office: 581 Days
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/156 comprising a multilayered structure
• CPC Class Codes: H10K 50/166 comprising a multilayered structure
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

An OLED device, a method for driving the OLED device, an OLED substrate, a method for manufacturing the OLED substrate, and a display device are provided. The OLED device includes: an anode, a first light emitting element, a common electrode, a second light emitting element, and a cathode, which are arranged in sequence.

Claims

1. An OLED device comprising:

an anode, a first light emitting element, a common electrode, a second light emitting element, and a cathode, which are arranged in sequence;

wherein the second light emitting element comprises a white organic light emitting layer.

2. The OLED device according to claim 1, wherein the anode and the cathode are electrically connected and the electrically connected anode and the cathode constitute a first signal terminal, and the common electrode constitutes a second signal terminal.

3. An OLED substrate comprising a power line and a common signal line, in which the OLED substrate further comprises a plurality of OLED devices according to claim 2 arranged in an array on a substrate;

wherein the common signal line is connected to the first signal terminal of each of the OLED devices, and the power line is connected to the second signal terminal of each of the OLED devices through transistors;

or the common signal line is connected to the second signal terminal of each of the OLED devices, and the power line is connected to the first signal terminal of each of the OLED devices through transistors.

4. The OLED substrate according to claim 3, wherein the OLED substrate comprises red sub-pixel regions, green sub-pixel regions, and blue sub-pixel regions;

the first light emitting element of the OLED device in the red sub-pixel region comprises a red organic light emitting layer, the first light emitting element of the OLED device in the green sub-pixel region comprises a green organic light emitting layer, the first light emitting element of the OLED device in the blue sub-pixel region comprises a blue organic light emitting layer;

the second light emitting element in each of the sub-pixel regions comprises a white light emitting layer.

5. The OLED substrate according to claim 4, further comprising a color filter on a light exiting side of the OLED device.

6. The OLED substrate according to claim 5, wherein the white light emitting layer comprises a red organic light emitting sub-layer, a green organic light emitting sub-layer and a blue organic light emitting sub-layer which are stacked;

in each of the light emitting elements of the plurality of the OLED devices of the OLED substrate having the white light emitting layer, the organic light emitting sub-layers with same color are in a same layer.

7. The OLED device according to claim 1, wherein a material of the common electrode comprises a metal material;

or a material of the common electrode comprises a metal material and a charge transport material; and

wherein a content of the metal material of the common electrode is 2%˜

30%, and wherein the content is a mass content, a molar content, or a volume content.

8. The OLED device according to claim 1, wherein the first light emitting element between the anode and the common electrode comprises a first hole transport layer, a first light emitting layer, and a first electron transport layer which are arranged in sequence in a direction from the anode to the common electrode.

9. The OLED device according to claim 1, wherein the second light emitting element between the common electrode and the cathode comprises a second hole transport layer, a second light emitting layer and a second electron transport layer which are arranged in sequence in a direction from the common electrode to the cathode.

10. The OLED device according to claim 1, wherein the first light emitting element comprises one of a red organic light emitting layer, a green organic light emitting layer, and a blue organic light emitting layer.

11. A method for driving an OLED device according to claim 1, comprising:

inputting an AC signal to the OLED device, so that the first light emitting element and the second light emitting element emit light alternately under the control of the AC signal;

or, inputting a DC signal to the OLED device, so that the first light emitting element or the second light emitting element emits light under the control of the DC signal.

12. An OLED substrate comprising a plurality of OLED devices according to claim 1 arranged in an array on a substrate.

13. A display device comprising a power module and the OLED substrate according to claim 12, wherein the power module inputs one of a DC signal and an AC signal to the OLED substrate.

14. A method for manufacturing an OLED substrate according to claim 12, comprising:

forming the anode, the first light emitting element, the common electrode, the second light emitting element comprising the white organic light emitting layer, and the cathode on the substrate, which are stacked in sequence.

15. A method for manufacturing an OLED substrate, wherein the OLED substrate comprises a power line and a common signal line, the method comprising:

forming a first electrode, a first light emitting element, a common electrode, a second light emitting element, and a second electrode sequentially stacked on the substrate;

wherein electrically connecting the first electrode and the second electrode, and forming a first signal terminal with the first electrode and the second electrode which are electrically connected and forming a second signal terminal with the common electrode;

wherein connecting the common signal line to the first signal terminal, connecting the power line to the second signal terminal through a transistor, or connecting the common signal line to the second signal terminal, connecting the power line to the first signal terminal through a transistor; and

wherein the first electrode is an anode and the second electrode is a cathode,

wherein forming an anode, a first light emitting element, a common electrode, a second light emitting element, and a cathode sequentially stacked on the substrate, comprises;

forming a first hole injection layer, a first hole transport layer and a first light emitting layer on the substrate sequentially with an ink let printing process;

forming a first electron transport layer, the common electrode, a second hole injection layer, a second hole transport layer, a second light emitting layer, a second electron transport layer and a second electron injection layer sequentially on the first light emitting layer with an evaporation process;

wherein, the first hole injection layer, the first hole transport layer, the first light emitting layer, and the first electron transport layer constitute the first light emitting element;

the second hole injection layer, the second hole transport layer, the second light emitting layer, the second electron transport layer, and the electron injection layer constitute the second light emitting element.

16. The method according to claim 15, wherein forming the first light emitting layer of the first light emitting element in the pixel regions so that a red organic light emitting layer is formed in a red sub-pixel region, a green organic light is formed in a green sub-pixel region, and a blue organic light is formed in a blue sub-pixel region.

17. The method according to claim 16, wherein forming the second light emitting layer of the second light emitting element in the pixel regions so that the second light emitting layer comprises a white light emitting layer, wherein the white light emitting layer comprises the red organic light emitting sub-layer, the green organic light emitting sub-layer, and the blue organic light emitting sub-layer which are stacked in each of the sub-pixel regions;

and arranging the organic light emitting sub-layers with same color in the white light emitting layer of each of the second light emitting elements in a same layer.

18. An OLED device comprising:

an anode, a first light emitting element, a common electrode, a second light emitting element, and a cathode, which are arranged in sequence;

wherein a material of the common electrode comprises a metal material;

or a material of the common electrode comprises a metal material and a charge transport material; and

wherein a content of the metal material of the common electrode is 2%˜

30%, and wherein the content is a mass content, a molar content, or a volume content.