DISPLAY DEVICE, METHOD OF MANUFACTURING DISPLAY DEVICE, AND ELECTRONIC DEVICE

• US 20180083226A1
• Filed: 02/19/2016
• Published: 03/22/2018
• Est. Priority Date: 04/01/2015
• Status: Active Application

• Current Assignee: Sony Group Corp.
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ichikawa, Tomoyoshi, Fujimaki, Hiroshi
• Application Number:
  US15/558,812
• Publication Number:
  US 20180083226A1
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/131 with spacer layers between the electroluminescent layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

A display device according to the present disclosure includes a first electrode, an inorganic hole injecting and transporting layer which is formed of an inorganic material and is formed on the first electrode, at least two light emitting units including a first organic light emitting unit and a second organic light emitting unit having different luminescent colors which are formed on the inorganic hole injecting and transporting layer, an electron transport layer which is formed on the at least two organic light emitting units, and a second electrode which is formed on the electron transport layer. Furthermore, a light emitting layer of the first organic light emitting unit is formed by laminating a light emitting layer of a first luminescent color and a light emitting layer of a second luminescent color, and a light emitting layer of the second organic light emitting unit is formed of the light emitting layer of the second luminescent color.

Claims

1. A display device comprising:

a first electrode;

an inorganic hole injecting and transporting layer configured to be formed of an inorganic material and be formed on the first electrode;

at least two light emitting units including a first organic light emitting unit and a second organic light emitting unit having different luminescent colors configured to be formed on the inorganic hole injecting and transporting layer;

an electron transport layer configured to be formed on the at least two organic light emitting units; and

a second electrode configured to be formed on the electron transport layer, wherein

a light emitting layer of the first organic light emitting unit is formed by laminating a light emitting layer of a first luminescent color and a light emitting layer of a second luminescent color, and

a light emitting layer of the second organic light emitting unit is formed of the light emitting layer of the second luminescent color.

2. The display device according to claim 1, comprising:

three light emitting units that are a first organic light emitting unit, a second organic light emitting unit, and a third organic light emitting unit, wherein

the light emitting layer of the first organic light emitting unit is formed by laminating the light emitting layer of the first luminescent color, the light emitting layer of the second luminescent color, and a light emitting layer of the third luminescent color,

the light emitting layer of the second organic light emitting unit is formed by laminating the light emitting layer of the second luminescent color and the light emitting layer of the third luminescent color, and

the light emitting layer of the third organic light emitting unit is formed of the light emitting layer of the third luminescent color.

3. The display device according to claim 1, wherein

the first organic light emitting unit includes an optical path length adjusting layer provided between the inorganic hole injecting and transporting layer and the light emitting layer of the first luminescent color.

4. The display device according to claim 1, wherein

in the inorganic hole injecting and transporting layer, an insulating film separates between the light emitting layer of the first luminescent color and the light emitting layer of the second luminescent color.

5. The display device according to claim 1, wherein

the first organic light emitting unit includes a partition wall provided between the first organic light emitting unit and an adjacent organic light emitting unit.

6. A method of manufacturing a display device, comprising:

forming an inorganic hole injecting and transporting layer formed of an inorganic material on a first electrode;

forming at least two light emitting units including a first organic light emitting unit formed by laminating a light emitting layer of a first luminescent color and a light emitting layer of a second luminescent color and a second organic light emitting unit formed of the light emitting layer of the second luminescent color on the inorganic hole injecting and transporting layer;

forming an electron transport layer on the at least two organic light emitting units; and

forming a second electrode on the electron transport layer, wherein

after the light emitting layer of the first luminescent color is formed on the inorganic hole injecting and transporting layer, the light emitting layer of the first luminescent color in a region of the second organic light emitting unit on the inorganic hole injecting and transporting layer is removed by irradiating energy beams, and then,

the light emitting layer of the second luminescent color is formed in the region of the first organic light emitting unit and the region of the second organic light emitting unit.

7. The method of manufacturing a display device according to claim 6, wherein

the energy beam is any one of a laser beam, an electron beam, a molecular beam, and an ion beam.

8. The method of manufacturing a display device according to claim 6, wherein

the surface of the inorganic hole injecting and transporting layer is irradiated with the energy beams from an oblique direction.

9. An electronic device comprising:

a display device configured to include;

a first electrode;

an inorganic hole injecting and transporting layer configured to be formed of an inorganic material and be formed on the first electrode;

at least two light emitting units including a first organic light emitting unit and a second organic light emitting unit having different luminescent colors configured to be formed on the inorganic hole injecting and transporting layer;

an electron transport layer configured to be formed on the at least two organic light emitting units; and

a second electrode configured to be formed on the electron transport layer, wherein

a light emitting layer of the first organic light emitting unit is formed by laminating a light emitting layer of a first luminescent color and a light emitting layer of a second luminescent color, and

a light emitting layer of the second organic light emitting unit is formed of the light emitting layer of the second luminescent color.