DISPLAY APPARATUS AND METHOD OF MANUFACTURING THE SAME

• US 20080309232A1
• Filed: 06/11/2008
• Published: 12/18/2008
• Est. Priority Date: 06/12/2007
• Status: Abandoned Application

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: YAMAMOTO, Kazuto
• Application Number:
  US12/137,021
• Publication Number:
  US 20080309232A1
• Time in Patent Office: Days
• US Class Current: 313/505
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

A display apparatus includes a light-emitting function layer, a first electrode, a second electrode, a flat reflecting layer, and a flat insulating film. The light-emitting function layer includes at least one layer. The second electrode is provided to face the first electrode through the light-emitting function layer. The flat insulating film is provided between the flat reflecting layer and the first electrode. The first electrode, second electrode, and flat insulating film have a transmission characteristic with respect to at least light having a wavelength that is in part of a wavelength range of light emitted from the light-emitting function layer. The flat reflecting layer has a reflection characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer.

Claims

1. A display apparatus comprising:

a light-emitting function layer including at least one layer;

a first electrode that has a transmission characteristic with respect to at least light having a wavelength that is in part of a wavelength range of light emitted from the light-emitting function layer;

a second electrode that is provided to face the first electrode through the light-emitting function layer and has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer;

a flat reflecting layer that has a reflection characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer; and

a flat insulating film that is provided between the flat reflecting layer and the first electrode and has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer.

2. An apparatus according to claim 1, wherein the flat insulating film has a refractive index substantially equal to that of the first electrode.

3. An apparatus according to claim 1, wherein the first electrode includes a conductive oxide metal layer, and the flat insulating film includes an organic film.

4. An apparatus according to claim 1, wherein the flat insulating film has a refractive index of approximately 1.6, and a thickness of not less than 2,000 nm.

5. An apparatus according to claim 1, wherein

the light-emitting function layer includes luminescent layers of different emission colors for the respective pixels, and

the flat insulating film has different thicknesses in accordance with the different emission color luminescent layers.

6. An apparatus according to claim 1, further comprising a pixel driving circuit that is connected to the first electrode and supplies an emission driving current.

7. An apparatus according to claim 1, further comprising

a pixel driving circuit that supplies an emission driving current, and

a protective insulating film that covers the pixel driving circuit, and wherein

the first electrode is connected to the pixel driving circuit through an opening portion extending through the flat insulating film and the protective insulating film.

8. An apparatus according to claim 1, further comprising a pixel driving circuit that supplies an emission driving current, and wherein

the flat reflecting layer is electrically connected to the pixel driving circuit and the first electrode is electrically connected to the flat reflecting layer.

9. An apparatus according to claim 1, further comprising

a pixel driving circuit that supplies an emission driving current, and

a protective insulating film that covers the pixel driving circuit, and wherein

the flat reflecting layer is connected to the pixel driving circuit through a first opening portion provided in the protective insulating film, and

the first electrode is electrically connected to the flat reflecting layer through a second opening portion provided in the flat insulating film.

10. An apparatus according to claim 1, further comprising a pixel driving circuit that supplies an emission driving current and includes an electrode and an interconnection layer, and wherein

at least one of the electrode and the interconnection layer of the pixel driving circuit two-dimensionally overlaps the first electrode through the flat insulating film.

11. An apparatus according to claim 1, wherein the light-emitting function layer includes an organic EL layer.

12. An apparatus according to claim 1, wherein the light-emitting function layer includes a polymer-based organic material.

13. A method of manufacturing a display apparatus including a light-emitting function layer, the method comprising steps of:

forming a flat reflecting layer having a reflection characteristic with respect to at least light having a wavelength that is in part of a wavelength range of light emitted from the light-emitting function layer;

forming, on the flat reflecting layer, a flat insulating film that has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer;

forming, on the flat insulating film, a first electrode that has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer;

forming the light-emitting function layer on the first electrode; and

forming, on the light-emitting function layer, a second electrode that has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer.

15. A method according to claim 13, wherein the flat insulating film has a refractive index substantially equal to that of the first electrode.

16. A method according to claim 13, wherein the flat insulating film has a refractive index of approximately 1.6, and a thickness of not less than 2,000 nm.

17. A method according to claim 13, wherein

the light-emitting function layer includes luminescent layers of different emission colors for the respective pixels, and

the flat insulating film has different thicknesses in accordance with the different emission color luminescent layers.

14. A method of manufacturing a display apparatus including a light-emitting function layer, the method comprising steps of:

forming a protective insulating film that has a first opening portion on a pixel driving circuit;

forming, on the protective insulating film and the first opening portion, a flat reflecting layer that has a reflection characteristic with respect to at least light having a wavelength that is in part of a wavelength range of light emitted from the light-emitting function layer;

forming a flat insulating film that has a second opening portion exposing a portion of the flat reflecting layer and has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer covering the other portion of the flat reflecting layer;

forming, on the flat insulating film and the second opening portion, a first electrode that has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer;

forming the light-emitting function layer on the first electrode; and

forming, on the light-emitting function layer, a second electrode that has a transmission characteristic with respect to at least the light having the wavelength that is in part of the wavelength range of the light emitted from the light-emitting function layer.