Display unit, method of manufacturing same, organic light emitting unit, and method of manufacturing same

• US 8,415,686 B2
• Filed: 06/14/2011
• Issued: 04/09/2013
• Est. Priority Date: 09/19/2003
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kashiwabara, Mitsuhiro, Yamada, Jiro, Yokoyama, Seiichi, Hanawa, Kohji
• Primary Examiner(s): GEBREMARIAM, SAMUEL A
• Application Number:
  US13/160,205
• Publication Number:
  US 20110241038A1
• Time in Patent Office: 665 Days
• Field of Search: 257/40, 257/59, 257/72, 257/79
• US Class Current: 257/79
• CPC Class Codes: H01L 27/153 in a repetitive configuration, e.g. LED bars
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/805 Electrodes
• CPC Class Codes: H10K 59/80518 : Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 59/80522 : combined with auxiliary electrodes
• CPC Class Codes: H10K 59/80524 : Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 59/876 : comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

A display unit capable of being simply designed and manufactured by using more simplified light emitting device structure while capable of high definition display and display with superior color reproducibility and a manufacturing method thereof are provided. The display unit is a display unit (1), wherein a plurality of organic EL devices (3B), (3G), and (3R), in which a function layer (6) including a light emitting layer (11) is sandwiched between a lower electrode (4) made of a light reflective material and a semi-transmissive upper electrode (7), and which has a resonator structure in which light h emitted in the light emitting layer (11) is resonated using a space between the lower electrode (4) and the upper electrode (7) as a resonant section (15) and is extracted from the upper electrode (7) side are arranged on a substrate (2). In the respective organic EL devices (3B), (3G), and (3R), the function layer (6) is made of an identical layer, and an optical distance L of the resonant section (15) is set to a value different from each other so that blue, green, or red wavelength region is resonated.

Claims

1. A display unit comprising a plurality of light emitting devices in which a function layer including at least a light emitting layer is sandwiched between a mirror made of a light reflective material and a light semi-transmissive half mirror, and which have a resonator structure for resonating light emitted in the light emitting layer by using a space between the mirror and the half mirror as a resonant section and extracting the light from the half mirror side are arranged on a substrate,

wherein in the respective light emitting devices, the light emitting layer is made of an identical layer, and the optical distance of the resonant section between the mirror and the half mirror is set to a plurality of different values.

2. The display unit according to claim 1, wherein the light emitting layer emits light in blue, green, and red wavelength regions, and

in the respective light emitting devices, an optical distance is set so that extraction of light in blue, green, or red wavelength region becomes a maximum, respectively.

3. The display unit according to claim 1, wherein the mirror and the half mirror are used as an electrode.

4. The display unit according to claim 1, wherein a transparent conductive layer is provided between the mirror and the half mirror, and the optical distance is adjusted by the transparent conductive layer.

5. The display unit according to claim 1, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

6. The display unit according to claim 1, wherein where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ

radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ

, the optical distance L is in a range that satisfies a following formula (1);

(2L)/λ

+φ

/(2π

)=m, where m is an integer  

 

(1).

7. The display unit according to claim 6, wherein a transparent conductive layer is provided between the mirror and the half mirror, and

where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2):

Lt=L−

Lf  

 

(2).

8. The display unit according to claim 1, wherein in the plurality of light emitting devices, the function layer including the light emitting layer is made of an identical layer.

9. The display unit according to claim 2, wherein the light emitting layer emits light in blue, green, and red wavelength regions and,

in the respective light emitting devices, the optical distance is set so that extraction of light in blue, green, or red wavelength region becomes the maximum, respectively.

10. The display unit according to claim 9, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

11. The display unit according to claim 9, wherein the mirror and the half mirror are used as an electrode, and

a transparent conductive layer is provided between the mirror and the half mirror, and the optical distance is adjusted by the transparent conductive layer.

12. The display unit according to claim 11, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

13. The display unit according to claim 9, wherein the mirror and the half mirror are used as an electrode, and

where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ

radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ

, the optical distance L is in a range satisfying a following formula (1).

(2L)/λ

+φ

/(2π

)=m, where m is an integer  

 

(1).

14. The display unit according to claim 13, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

15. The display unit according to claim 13, wherein a transparent conductive layer is provided between the mirror and the half mirror, and

where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to meet the following formula (2).

Lt=L−

Lf  

 

(2).

16. The display unit according to claim 15, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

17. The display unit according to claim 1, wherein the reflectance of the half mirror ranges from 0.1% to less than 50%.

18. The display unit according to claim 17, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

19. The display unit according to claim 17, wherein the mirror and the half mirror are used as an electrode, and

a transparent conductive layer is provided between the mirror and the half mirror, and the optical distance is adjusted by the transparent conductive layer.

20. The display unit according to claim 19, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

21. The display unit according to claim 17, wherein the mirror and the half mirror are used as an electrode, and

where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ

radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ

, the optical distance L is in a range satisfying a following formula (1);

(2L)/λ

+φ

/(2π

)=m, where m is an integer  

 

(1).

22. The display unit according to claim 21, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

23. The display unit according to claim 21, wherein a transparent conductive layer is provided between the mirror and the half mirror, and

where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2):

Lt=L−

Lf  

 

(2).

24. The display unit according to claim 23, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror.

25. The display unit according to claim 17, wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror,

the mirror and the half mirror are used as an electrode,

a transparent conductive layer is provided between the mirror and the half mirror,

where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ

radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ

, the optical distance L is in a range satisfying a following formula (1), and

where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2).

(2L)/λ

+φ

/(2π

)=m, where m is an integer  

 

(1)

Lt=L−

Lf  

 

(2).

26. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=0 for the light emitting device of the light emitting devices for emitting blue light;

m=0 for the light emitting device of the light emitting devices for emitting green light; and

m=0 for the light emitting device of the light emitting devices for emitting red light.

27. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light;

m=0 for the light emitting device of the light emitting devices for emitting green light; and

m=0 for the light emitting device of the light emitting devices for emitting red light.

28. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light;

m=1 for the light emitting device of the light emitting devices for emitting green light; and

m=0 for the light emitting device of the light emitting devices for emitting red light.

29. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light;

m=1 for the light emitting device of the light emitting devices for emitting green light; and

m=1 for the light emitting device of the light emitting devices for emitting red light.

30. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light;

m=1 for the light emitting device of the light emitting devices for emitting green light; and

m=1 for the light emitting device of the light emitting devices for emitting red light.

31. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light;

m=2 for the light emitting device of the light emitting devices for emitting green light; and

m=1 for the light emitting device of the light emitting devices for emitting red light.

32. The display unit according to claim 25, wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light;

m=2 for the light emitting device of the light emitting devices for emitting green light; and

m=2 for the light emitting device of the light emitting devices for emitting red light.