Organic electroluminescent device, method of manufacturing organic electroluminescent device, and electronic apparatus

• US 7,567,030 B2
• Filed: 07/17/2006
• Issued: 07/28/2009
• Est. Priority Date: 09/05/2005
• Status: Expired due to Fees

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Wano, Hiromi
• Primary Examiner(s): Patel; Nimeshkumar D.
• Assistant Examiner(s): Hollweg; Thomas A
• Application Number:
  US11/457,928
• Publication Number:
  US 20070052345A1
• Time in Patent Office: 1,107 Days
• Field of Search: 313/504, 313/506, 313/116, 257/E33.074, 445/23, 362/246, 362/355
• US Class Current: 313/504
• CPC Class Codes: H01J 1/70 with protective, conductive, or reflective layers
• CPC Class Codes: H01J 1/74 with adjacent dots or lines of different luminescent material
• CPC Class Codes: H01J 29/325 with adjacent lines
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/854 comprising scattering means
• 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 59/873 Encapsulations
• CPC Class Codes: H10K 59/877 comprising scattering means

Abstract

An organic electroluminescent device includes, on a substrate, a pixel having a luminescent functional layer which is sandwiched by a first electrode and a second electrode, and a unit pixel group composed of a plurality of the pixels. A scattering portion which scatters luminescent light of the luminescent functional layer is provided in a pixel selected from the unit pixel group.

Claims

1. An organic electroluminescent device comprising:

pixels, each of the pixels having an organic EL element that includes a first electrode, a second electrode, and a luminescent functional layer which is sandwiched by the first electrode and the second electrode, and

a scattering portion which scatters luminescent light of the luminescent functional layer,

the pixels including a red pixel emitting red light, a green pixel emitting green light and a blue pixel emitting blue light, and

the scattering portion being located at position corresponding to one of a group consisting of only the green pixel, only the blue pixel, and only the green pixel and the blue pixel.

2. The organic electroluminescent device according to claim 1, further comprising a substrate,

wherein the scattering portion is formed by having a concave and convex portion, which allows the surface of the substrate to scatter visible light, between the substrate and the luminescent functional layer.

3. The organic electroluminescent device according to claim 1, wherein a planarizing layer is formed in contact with the scattering portion.

4. The organic electroluminescent device according to claim 3, further comprising a substrate,

wherein the refractive index of the planarizing layer is different from the refractive index of the substrate.

5. The organic electroluminescent device according to claim 1,

wherein the scattering portion is a reflective layer formed in a concave and convex portion.

6. The organic electroluminescent device according to claim 1, further comprising a substrate, a counter substrate and a bonding layer, the counter substrate being arranged to face the substrate and the boning layer bonds the substrate and the counter substrate together,

wherein the scattering portion is a concave and convex portion formed on the surface of the counter substrate between the counter substrate and the luminescent functional layer.

7. The organic electroluminescent device according to claim 6,

wherein the refractive index of the bonding layer is different from the refractive index of the counter substrate.

8. The organic electroluminescent device according to claim 1, further comprising a substrate, a color filter substrate and a bonding layer, the color filter substrate being arranged to face the substrate and the bonding layer bonds the substrate and the color filter substrate together,

wherein the color filter substrate has a substrate body and a colored layer of plural colors corresponding to the plurality of pixels, respectively, of a unit pixel group toward the luminescent functional layer from the color filter substrate, and

wherein the scattering portion is a concave and convex portion formed on the surface of the substrate body between the substrate body and the colored layer.

9. The organic electroluminescent device according to claim 1, further comprising a substrate, a color filter substrate and a bonding layer, the color filter substrate being arranged to face the substrate and the bonding layer bonds the substrate and the color filter substrate together,

wherein the color filter substrate has a substrate body, a colored layer of plural colors corresponding to the plurality of pixels, respectively, of a unit pixel group toward the luminescent functional layer from the color filter substrate, and an overcoat layer, and

wherein the scattering portion is a concave and convex portion formed on the surface of the overcoat layer, or the surface of the colored layer.

10. The organic electroluminescent device according to claim 1 further comprising a substrate, a counter substrate and a bonding layer, the counter substrate being arranged to face the substrate and the bonding layer bonds the substrate and the counter substrate together,

wherein the bonding layer has resin filler and particles, serving as the scattering portion, and the refractive index of the particles is different from the refractive index of the resin filler.

11. The electronic apparatus comprising the organic electroluminescent device according to claim 1.

12. A method of manufacturing an organic electroluminescent device comprising, pixels, each of the pixels having an organic EL element that includes a first electrode, a second electrode, and a luminescent functional layer which is sandwiched by the first electrode and the second electrode, the pixels including a red pixel emitting red light, a green pixel emitting green light and a blue pixel emitting blue light,

the method comprising forming a scattering portion, which scatters luminescent light of the luminescent functional layer, and the scattering portion being located at position corresponding to one of a group consisting of only the green pixel, only the blue pixel, and only the green pixel and the blue pixel.

13. The method of manufacturing an organic electroluminescent device according to claim 12,

wherein the organic electroluminescent device further comprises a substrate, and

wherein the step of forming a scattering portion includes performing hydrofluoric acid treatment on the substrate or patterning any one of silicon oxide, silicon nitride and a resin layer on the substrate, thereby forming a concave and convex portion in the substrate.

14. The method of manufacturing an organic electroluminescent device according to claim 12,

wherein the step of forming a scattering portion includes forming a resin layer and thereafter performing ozone plasma treatment on the resin layer, thereby forming a concave and convex portion in the resin layer.