Color display apparatus having electroluminescence elements

• US 20020036463A1
• Filed: 10/31/2001
• Published: 03/28/2002
• Est. Priority Date: 02/27/1998
• Status: Active Grant

• Current Assignee: Kenichi Shibata, Kiyoshi Yoneda
• Original Assignee: Kenichi Shibata, Kiyoshi Yoneda
• Inventors: Shibata, Kenichi, Yoneda, Kiyoshi
• Granted Patent: US 6,580,214 B2
• Time in Patent Office: Days
• US Class Current: 313/506
• CPC Class Codes: H01J 1/74 with adjacent dots or lines of different luminescent material
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/321 Inverted OLED, i.e. having cathode between substrate and anode
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• 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 59/80515 characterised by their shape
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

A color display apparatus comprises a substrate; thin film transistors formed on the substrate, each of the thin film transistors having a source electrode and a drain electrode; electroluminescence elements respectively formed over the thin film transistors and driven by the thin film transistors, each of the electroluminescence elements having a cathode connected to a source electrode or drain electrode of a thin film transistor, a luminous element layer, and an anode electrode sequentially disposed thereover. A color filter or fluorescent color conversion layer acting as a color element is formed on the side of the anode electrode of an electroluminescence element. The same luminous layer material is used for each display pixel to display a color image.

Claims

1. A color display apparatus comprising:

a substrate;

thin film transistors formed on said substrate, each of said thin film transistors having a source electrode and a drain electrode;

electroluminescence elements respectively formed over said thin film transistors, each of said electroluminescence elements having a lower electrode connected to one of said source electrode or said drain electrode of said thin film transistor, a luminous element layer including at least a luminous layer, and a light passing upper electrode, sequentially formed in that order; and

color elements respectively arranged immediately above said upper electrode of said electroluminescence elements with no adhesive in between.

2. The color display apparatus defined in claim 1, wherein each of said color elements comprises a color filter layer formed on a transparent substrate.

3. The color display apparatus defined in claim 1, wherein each of said color elements comprises a color filter layer through which can pass light of a predetermined wavelength emitted from said luminous layer.

4. The color display apparatus defined in claim 3, wherein each of said color elements comprises a color filter layer formed on a transparent substrate, said color filter passing light of a predetermined wavelength emitted from said luminous layer.

5. The color display apparatus defined in claim 3, wherein the luminous layer of each of said electroluminescence elements includes of a white luminous material, and wherein said color filter layer includes a layer for red light through which red light within white light emitted from said luminous layer passes, a layer for green light through which green light within the white light emitted from said luminous layer passes, and a layer for blue light through which blue light within the white light emitted from said luminous layer light passes.

6. The color display apparatus defined in claim 1, wherein each of said color elements comprises a color conversion layer formed on a transparent substrate.

7. The color display apparatus defined in claim 1, wherein each of said color elements comprises a color conversion layer for converting light from said luminous layer into light of a predetermined wavelength.

8. The color display apparatus defined in claim 7, wherein each of said color elements comprises the color conversion layer formed on a transparent substrate, for converting light from said luminous layer into light of a predetermined wavelength.

9. The color display apparatus defined in claim 8, wherein said color conversion layer comprises a layer for red light which converts light emitted from said luminous layer into red light, a layer for green light which converts light emitted from said luminous layer into green light, and a layer for blue light which converts light emitted from said luminous layer into blue light.

10. The color display apparatus defined in claim 1, wherein each of said electroluminescence elements comprises an organic electroluminescence element using an organic material for said luminous layer.

11. A color display apparatus comprising:

a substrate;

thin film transistors formed on said substrate, each of said thin film transistors having a source electrode and a drain electrode;

electroluminescence elements respectively formed over said thin film transistors, each of said electroluminescence elements having a lower electrode connected to one of said source electrode or said drain electrode of said thin film transistor, a luminous element layer including at least a luminous layer, and a light passing upper electrode, sequentially formed in that order; and

color elements respectively arranged on the side of said anodes of said electroluminescence elements, wherein each of said upper electrodes of said electroluminescence elements is shaped in a comb, mesh, or grid pattern through which light can pass.

12. The color display apparatus defined in claim 11, wherein each of said color elements comprises a color filter layer formed on a transparent substrate.

13. The color display apparatus defined in claim 11, wherein each of said color elements comprises a color filter layer through which can pass light of a predetermined wavelength emitted from said luminous layer.

14. The color display apparatus defined in claim 13, wherein each of said color elements comprises a color filter layer formed on a transparent substrate, said color filter passing light of a predetermined wavelength emitted from said luminous layer.

15. The color display apparatus defined in claim 13, wherein the luminous layer of each of said electroluminescence elements includes a white luminous material, and wherein said color filter layer includes a layer for red light through which red light within white light emitted from said luminous layer passes, a layer for green light through which green light within the white light emitted from said luminous layer passes, and a layer for blue light through which blue light within the white light emitted from said luminous layer passes.

16. The color display apparatus defined in claim 11, wherein each of said color elements comprises a color conversion layer formed on a transparent substrate.

17. The color display apparatus defined in claim 11, wherein each of said color elements comprises a color conversion layer for converting light from said luminous layer into light of a predetermined wavelength.

18. The color display apparatus defined in claim 17, wherein each of said color elements comprises the color conversion layer formed on a transparent substrate, for converting light from said luminous layer into light of a predetermined wavelength.

19. The color display apparatus defined in claim 18, wherein said color conversion layer comprises a layer for red light which converts light emitted from said luminous layer into red light, a layer for green light which converts light emitted from said luminous layer into green light, and a layer for blue light which converts light emitted from said luminous layer into blue light.

20. The color display apparatus defined in claim 11, wherein each of said electroluminescence elements comprises an organic electroluminescence element using an organic material for said luminous layer.

21. A color display apparatus comprising:

a substrate;

thin film transistors formed on said substrate, each of said thin film transistors having a source electrode and a drain electrode; and

electroluminescence elements respectively formed over said thin film transistors, each of said electroluminescence elements having a lower electrode connected to one of said source electrode or said drain electrode, a luminous element layer including at least a luminous layer, and a light passing upper electrode, sequentially formed in that order, wherein said luminous layer for each of said electroluminescence elements is formed of a same material, and

color filters are respectively provided over said upper electrodes of said electroluminescence elements.

22. The color display apparatus defined in claim 21, wherein color filter layers are respectively formed over said upper electrodes of said electroluminescence elements such that each of said color filter layers is assigned to each of said electroluminescence elements for permitting transmission of light having a predetermined wavelength.

23. The color display apparatus defined in claim 21, wherein said luminous layer is composed of a white color emissive material common to all electroluminescence elements, and each of said color filters comprises a red, green, or blue color filter layer formed over said upper electrode, and each of said color elements is assigned to each of said electroluminescence elements.

25. The color display apparatus defined in claim 24, wherein each of said color elements comprises a color filter layer formed on a transparent substrate.

26. The color display apparatus defined in claim 24, wherein each of said color elements comprises a color filter layer through which can pass light of a predetermined wavelength emitted from said luminous layer.

27. The color display apparatus defined in claim 26, wherein each of said color elements comprises a color filter layer formed on a transparent substrate, said color filter passing light of a predetermined wavelength emitted from said luminous layer.

28. The color display apparatus defined in claim 26, wherein the luminous layer of each of said electroluminescence elements includes a white luminous material, and wherein said color filter layer includes a layer for red light through which red light within white light emitted from said luminous layer passes, a layer for green light through which green light within the white light emitted from said luminous layer passes and a layer for blue light through which blue light within the white light emitted from said luminous layer passes.

29. The color display apparatus defined in claim 24, wherein each of said color elements comprises a color conversion layer formed on a transparent substrate.

30. The color display apparatus defined in claim 24, wherein each of said color elements comprises a color conversion layer for converting light from said luminous layer into light of a predetermined wavelength.

31. The color display apparatus defined in claim 30, wherein each of said color elements comprises the color conversion layer formed on a transparent substrate, for converting light from said luminous layer into light of a predetermined wavelength.

32. The color display apparatus defined in claim 31, wherein said color conversion layer comprises a layer for red light which converts light emitted from said luminous layer into red light, a layer for green light which converts light emitted from said luminous layer into green light, and a layer for blue light which converts light emitted from said luminous layer into blue light.

33. The color display apparatus defined in claim 24, wherein each of said electroluminescence elements comprises an organic electroluminescence element using an organic material for said luminous layer.

24. A color display apparatus having a plurality of display pixels on a substrate, said display pixels comprising:

thin film transistors formed on said substrate, each of said thin film transistors having a source and a drain; and

electroluminescence elements respectively formed over said thin film transistors, each of said electroluminescence elements having a lower electrode connected to one of said source or said drain of said thin film transistor, a luminous element layer including at least a luminous layer, and a light passing upper electrode, sequentially formed in that order;

wherein an insulating layer separates at least said luminous layer of each of said display pixels, and

respective color elements are provided over said upper electrode of said electroluminescence elements.