Double-sided organic light-emitting diode, and manufacturing method and display device thereof

• US 9,312,321 B2
• Filed: 12/17/2012
• Issued: 04/12/2016
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: Lenovo (Beijing) Limited (Lenovo Group Ltd.), Lenovo Company Limited (Lenovo Group Ltd.)
• Original Assignee: Lenovo (Beijing) Limited (Lenovo Group Ltd.), Lenovo Company Limited (Lenovo Group Ltd.)
• Inventors: Niu, Quan, Xu, Fang, Shang, Ke, Yang, Guang
• Primary Examiner(s): ZHU, SHENG-BAI
• Application Number:
  US14/342,218
• Publication Number:
  US 20140306204A1
• Time in Patent Office: 1,212 Days
• Field of Search: 257/40, 257/88, 257/103, 438/23, 438/34
• US Class Current: 1/1
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

A double-sided organic light-emitting diode and manufacturing method thereof, and a display device using double-sided organic light-emitting diode pixel configuration are described. The double-sided organic light-emitting diode includes a first electrode, a first organic semiconductor layer disposed on the first electrode, a shared electrode disposed on the first organic semiconductor layer and electrically connected to the output terminal of a thin film transistor; a second organic semiconductor layer disposed on the shared electrode, and a second electrode disposed on the second organic semiconductor. The first electrode, the shared electrode and the second electrode are electrically insulated from each other, and two organic light-emitting diodes in the double-sided organic light emitting diode can be independently controlled.

Claims

1. A double-sided organic light-emitting diode comprising:

a transparent conducting layer electrically connected to an output end of a thin film transistor;

a transparent insulating layer arranged on the transparent conducting layer;

a first electrode arranged on the transparent insulating layer and electrically isolated from the transparent conducting layer;

a first organic light-emitting semiconductor layer arranged on the first electrode;

a shared electrode arranged on the first organic light-emitting semiconductor layer and electrically connected to the transparent conducting layer;

a second organic light-emitting semiconductor layer arranged on the shared electrode; and

a second electrode arranged on the second organic light-emitting semiconductor layer,

wherein, the first electrode, the shared electrode and the second electrode are electrically isolated from each other, the first electrode, the first organic light-emitting semiconductor layer and the shared electrode operate as a first organic light-emitting diode; and

the second electrode, the second organic light-emitting semiconductor layer and the shared electrode operate as a second organic light-emitting diode,

wherein the shared electrode is an opaque reflection layer and the first electrode and the second electrode are transparent layers.

2. The double-sided organic light-emitting diode according to claim 1, wherein,

the area of the transparent insulating layer is less than the area of the transparent conducting layer;

the area of the first electrode is less than the area of the transparent insulating layer;

the area of the first organic light-emitting semiconductor layer is larger than the area of the first electrode and is less than or equal to the area of the transparent insulating layer; and

the area of the shared electrode is larger than the area of the transparent insulating layer and is less than or equal to the area of the transparent conducting layer.

3. A display device having pixel array in which each pixel includes a double-sided organic light-emitting diode and a thin film transistor,

wherein, the double-sided organic light-emitting diode includes:

a transparent conducting layer electrically connected to an output end of the thin film transistor;

a transparent insulating layer arranged on the transparent conducting layer;

a first electrode arranged on the transparent insulating layer and electrically isolated from the transparent conducting layer;

a first organic light-emitting semiconductor layer arranged on the first electrode;

a shared electrode arranged on the first organic light-emitting semiconductor layer and electrically connected to the transparent conducting layer;

a second organic light-emitting semiconductor layer arranged on the shared electrode; and

a second electrode arranged on the second organic light-emitting semiconductor layer,

the first electrode, the shared electrode and the second electrode are electrically isolated from each other,

wherein the first electrode, the first organic light-emitting semiconductor layer and the shared electrode operate as a first organic light-emitting diode; and

the second electrode, the second organic light-emitting semiconductor layer and the shared electrode operate as a second organic light-emitting diode.

4. The display device according to claim 3, wherein,

the area of the transparent insulating layer is less than the area of the transparent conducting layer;

the area of the first electrode is less than the area of the transparent insulating layer;

the area of the first organic light-emitting semiconductor layer is larger than the area of the first electrode and is less than or equal to the area of the transparent insulating layer; and

the area of the shared electrode is larger than the area of the transparent insulating layer and is less than or equal to the area of the transparent conducting layer.

5. The display device according to claim 3, wherein, the transparent conducting layer covers at least a part of the output end of the thin film transistor and is electrically connected to the output end of the thin film transistor.

6. The display device according to claim 5, wherein, the transparent conducting layer covers on the output end of the thin film transistor and the area of the transparent conducting layer is larger than or equal to the area of the output end of the thin film transistor.

7. A method for manufacturing a double-sided organic light-emitting diode comprising:

providing a transparent conducting layer and electrically connecting the transparent conducting layer to an output end of a thin film transistor;

arranging a transparent insulating layer on the transparent conducting layer;

providing a first electrode on the transparent insulating layer so that the first electrode is electrically isolated from the transparent conducting layer;

arranging a first organic light-emitting semiconductor layer on the first electrode;

arranging a shared electrode on the first organic light-emitting semiconductor layer and making the shared electrode electrically connected to an output end of a thin film transistor and electrically isolated from the first electrode;

arranging a second organic light-emitting semiconductor layer on the shared electrode; and

arranging a second electrode on the second organic light-emitting semiconductor layer and making the second electrode electrically isolated from the first electrode and the shared electrode,

wherein the first electrode, the first organic light-emitting semiconductor layer and the shared electrode operate as a first organic light-emitting diode; and

the second electrode, the second organic light-emitting semiconductor layer and the shared electrode operate as a second organic light-emitting diode, and the shared electrode is an opaque reflection layer and the first electrode and the second electrode are transparent layers.

8. The method according to claim 7, wherein, the transparent conducting layer covers on at least a part of the output end of the thin film transistor.

9. The method according to claim 8, wherein, the transparent conducting layer completely covers the output end of the thin film transistor and the area of the transparent conducting layer is larger than or equal to the area of the output end of the thin film transistor.

10. The method according to claim 7, wherein,

the transparent insulating layer is arranged on a part of the transparent conducting layer, and the area of the transparent insulating layer is less than the area of the transparent conducting layer;

the first electrode is arranged on a part of the transparent insulating layer and the area of the first electrode is less than the area of the transparent insulating layer;

the first organic light-emitting semiconductor layer is arranged on the first electrode to cover the first electrode and the area of the first organic light-emitting semiconductor layer is larger than the area of the first electrode and is less than or equal to the area of the transparent insulating layer; and

the shared electrode is arranged on the first organic light-emitting semiconductor layer to cover the first organic light-emitting semiconductor layer and the area of the shared electrode is larger than the area of the transparent insulating layer and is less than or equal to the area of the transparent conducting layer.