DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

• US 20160204167A1
• Filed: 10/07/2015
• Published: 07/14/2016
• Est. Priority Date: 01/09/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: JUN, Woo Sik
• Granted Patent: US 9,887,248 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/80522 combined with auxiliary electrodes

Abstract

A display device includes a substrate; a plurality of color filters on the substrate, a common electrode covering the plurality of color filters, a white emission layer covering the common electrode, a plurality of pixel electrodes on the white emission layer and a plurality of pixel switching elements on the plurality of pixel electrodes and connected to the plurality of pixel electrodes, wherein the white emission layer includes a plurality of quantum dots.

Claims

1. A display device comprising:

a substrate;

a plurality of color filters on the substrate;

a common electrode covering the plurality of color filters;

a white emission layer covering the common electrode;

a plurality of pixel electrodes on the white emission layer; and

a plurality of pixel switching elements on the plurality of pixel electrodes and connected to the plurality of pixel electrodes,

wherein the white emission layer comprises a plurality of quantum dots.

2. The display device of claim 1, wherein

the plurality of pixel switching elements comprises:

a first insulating layer covering the pixel electrode;

a gate electrode on the first insulating layer;

a second insulating layer covering the gate electrode;

a semiconductor on the second insulating layer and overlapping the gate electrode;

a third insulating layer covering the semiconductor; and

a source electrode and a drain electrode on the third insulating layer, and respectively connected to the semiconductor through a pair of contact holes at the third insulating layer,

wherein the drain electrode is connected to the pixel electrode.

3. The display device of claim 2, further comprising

a connecting member at a same layer as the gate electrode,

wherein the connecting member connects the drain electrode and the pixel electrode to each other.

4. The display. device of claim 3, wherein

the connecting member is connected to the pixel electrode through a first connection hole at the first insulating layer, and is connected to the drain electrode through a second connection hole at the second insulating layer and the third insulating layer.

5. The display device of claim 4, further comprising:

a light blocking member between the plurality of color filters; and

an auxiliary electrode on the light blocking member,

wherein the auxiliary electrode is in contact with the common electrode.

6. The display device of claim 4, further comprising:

an encapsulation layer covering the plurality of pixel switching elements.

7. The display device of claim 4, further comprising:

an electron transporting layer and a hole transporting layer at respective sides of the white emission layer, wherein the electron transporting layer and the hole transporting layer comprise an inorganic layer.

8. A method for manufacturing a display device, the comprising;

forming a plurality of color filters on a substrate;

forming a common electrode covering the plurality of color filters;

forming a white emission layer covering the common electrode;

forming a plurality of pixel electrodes covering the white emission layer; and

forming a plurality of pixel switching elements connected to the plurality of pixel electrodes on the plurality of pixel electrodes,

wherein the white emission layer comprises a plurality of quantum dots.

9. The method of claim 8, wherein

the forming the pixel switching elements comprises:

forming a first insulating layer covering the plurality of pixel electrodes;

forming a gate electrode on the first insulating layer;

forming a second insulating layer covering the gate electrode;

forming a semiconductor overlapping the gate electrode on the second insulating layer;

forming a third insulating layer covering the semiconductor;

forming a pair of contact holes at the third insulating layer to expose the semiconductor; and

forming a source electrode and a drain electrode respectively connected to the semiconductor through the pair of contact holes at the third insulating layer,

wherein the drain electrode is connected to the pixel electrode.

10. The method of claim 9, further comprising:

forming a connecting member connecting the drain electrode and the pixel electrode, at the same layer as the gate electrode.

11. The method of claim 10, further comprising:

forming a first connection hole exposing a portion of the pixel electrode, in the first insulating layer, and

wherein the forming the pair of contact holes at the third insulating layer comprises, forming a second connection hole exposing a portion of the connecting member, at the second insulating layer and the third insulating layer.

12. The method of claim 11, wherein

the connecting member is connected to the pixel electrode through the first connection hole, and is connected to the drain electrode through the second connection hole.

13. The method of claim 8, further comprising:

forming a light blocking member on the substrate; and

forming an auxiliary electrode on the light blocking member.

14. The method of claim 8, further comprising:

forming an encapsulation layer covering a plurality of pixel switching elements.