Full color organic light-emitting display device

• US 20030222577A1
• Filed: 05/28/2003
• Published: 12/04/2003
• Est. Priority Date: 05/28/2002
• Status: Abandoned Application

• Current Assignee: RITDISPLAY CORPORATION
• Original Assignee: RITDISPLAY CORPORATION
• Inventors: Lu, Tien-Rong
• Application Number:
  US10/445,955
• Publication Number:
  US 20030222577A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

This invention relates to an organic light-emitting display (OLED) device comprising a substrate, a first electrode layer (cathode) mounted on one side of the substrate, a second electrode layer (anode) sandwiched between the substrate and the first electrode layer (cathode), at least one organic electroluminescent layer sandwiched between the first electrode layer (cathode) and the second electrode layer (anode), a color conversion layer of fluorescent powder sandwiched between the substrate and the second electrode layer (anode), and at least one filter layer sandwiched between the color conversion layer of fluorescent powder and the substrate; wherein said organic electroluminescent layer emits light in a wavelength bandwidth of blue light, and said color conversion layer of fluorescent power converts the light emitted from said organic electroluminescent layer into green, red or blue light. Also, the present invention relates to a process for fabricating the OLED device.

Claims

1. An organic light-emitting display device, comprising

a substrate;

a first electrode layer (cathode) mounted on one side of said substrate;

a second electrode layer (anode) sandwiched between said substrate and said first electrode layer (cathode);

at least one organic electroluminescent layer sandwiched between said first electrode layer (cathode) and said second electrode layer (anode); and

a color conversion layer of fluorescent powder sandwiched between said substrate of said second electrode layer (anode);

wherein said organic electroluminescent layer emits light in a wavelength bandwidth of blue light, and said color conversion layer of fluorescent powder converts the light emitted from said organic electroluminescent layer into green, red or blue light.

2. The organic light-emitting display device as claimed in claim 1, further comprising an overcoating layer sandwiched between said second electrode (anode) and said color conversion layer of fluorescent powder for protecting said color conversion layer of fluorescent powder.

3. The organic light-emitting display device as claimed in claim 1, further comprising a passivation layer formed over said first electrode layer (cathode) to protect said first electrode layer (cathode);

and said passivation layer is aromatic polyimide, parylene, or teflon copolymer.

4. The organic light-emitting display device as claimed in claim 1, further comprising at least one dark-color frame of a light-absorption matrix mounted at edges of the pixels of said color conversion layer of fluorescent powder to avoid leakage of light.

5. The organic light-emitting display device as claimed in claim 1, wherein said second electrode layer (anode) is transparent.

6. The organic light-emitting display device as claimed in claim 1, wherein said second electrode layer (anode) is made of indium tin oxide (ITO).

7. The organic light-emitting display device as claimed in claim 2, wherein said overcoating layer is made of transparent epoxy, polyimide, urea resin, silicon or transparent inorganic adhesive SiO₂, or transparent inorganic adhesive TiO₂.

8. The organic light-emitting display device as claimed in claim 1, wherein said organic electroluminescent layer is made of polymeric organic electroluminescent material or small-molecule organic electroluminescent material to produce blue or ultraviolet light to excite said color conversion layer of fluorescent powder to emit green light or red light.

9. The organic light-emitting display device as claimed in claim 1, wherein said color conversion layer of fluorescent powder is a composition or inorganic fluorescent powder.

10. The organic light-emitting display device as claimed in claim 1, wherein said first electrodes layer (cathode) is in a form of plural stripes and said second electrode layer (anode) is in a form of plural stripes, and said first electrode layer (cathode) intersects said second electrode layer (anode).

11. A process for fabricating organic light-emitting display devices, comprising the following steps:

forming at least one color conversion layer of fluorescent powder over a substrate;

forming a second electrode layer (anode) over said color conversion layer of fluorescent powder;

forming at least one organic electroluminescent layer over said second electrode layer (anode); and

forming a first electrode layer (cathode) over the organic electroluminescent layer;

wherein said organic electroluminescent layer emits light in a wavelength bandwidth of blue light, and said color conversion layer of fluorescent powder converts the light emitted from said organic electroluminescent layer into green, red or blue light.

12. The process as claimed in claim 11, further comprising forming a transparent overcoating layer over said color conversion layer of fluorescent powder after forming said color conversion layer of fluorescent powder, and said transparent overcoating layer is sandwiched between said color conversion layer of fluorescent powder and said second electrode for protecting said color conversion layer of fluorescent powder.

13. The process as claimed in claim 11, further comprising forming a dark-color frame of a light-absorption matrix over said substrate after forming said color conversion layer of fluorescent powder, wherein said dark-color frame of said light-absorption matrix is mounted at edges of the pixels of said color conversion layer of fluorescent powder to avoid leakage of light.

14. The process as claimed in claim 12, further comprising forming a dark-color frame of a light-absorption matrix over said substrate before forming said overcoating layer, wherein said dark-color frame of said light-absorption matrix is mounted at edges of the pixels of said color conversion layer of fluorescent powder to avoid leakage of light.

15. The process as claimed in claim 11, wherein said color conversion layer of fluorescent powder is formed by deposition.

16. The process as claimed in claim 11, wherein said second electrode layer (anode) is made of indium tin oxide (ITO).

17. The process as claimed in claim 12, wherein said overcoating layer is made of transparent epoxy, polyimide, urea resin, silicone or transparent inorganic adhesive SiO₂, or transparent inorganic adhesive TiO₂.

18. The process as claimed in claim 11, wherein said organic electroluminescent layer is made of polymeric organic electroluminescent material or small-molecule organic electroluminescent material.

19. The process as claimed in claim 11, wherein said color conversion layer of fluorescent powder is a composition of inorganic fluorescent powder.

20. The process as claimed in claim 11, wherein said first electrode layer (cathode) is in a form of plural stripes and said second electrode layer (anode) is in a form of plural stripes, and said first electrode layer (cathode) intersects said second electrode layer (anode).