Photoluminescence color display comprising quantum dots material and a wavelength selective filter that allows passage of excitation radiation and prevents passage of light generated by photoluminescence materials

• US 8,947,619 B2
• Filed: 02/23/2012
• Issued: 02/03/2015
• Est. Priority Date: 07/06/2006
• Status: Active Grant

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Li, Yi-Qun, Dong, Yi, Shan, Wei
• Primary Examiner(s): Lee, Paul
• Application Number:
  US13/403,854
• Publication Number:
  US 20120287381A1
• Time in Patent Office: 1,076 Days
• Field of Search: 349/71, 349/106, 313467-469
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133509 Filters, e.g. light shielding masks
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: G02F 2203/055 wavelength filtering
• CPC Class Codes: G02F 2203/34 Colour display without the use of colour mosaic filters

Abstract

A photoluminescence color display comprises a display panel that displays red, green and blue pixel areas, an excitation source operable to generate excitation radiation for operating the display, and a photoluminescence color-element plate. The color-element plate comprises at least one photoluminescence material, such as a phosphor material or quantum dots, that is operable to emit light corresponding to red, green and blue pixel areas of the display in response to said excitation radiation. Additionally, the photo-luminescence color display comprises a wavelength selective filter that is provided between the color-element plate and the excitation source. The filter has a transmission characteristic that allows the passage of excitation radiation from the excitation source to excite the at least one photoluminescence material whilst preventing the passage of photoluminescence light back to the excitation source thereby prevent cross contamination of light among the different pixel areas of the display.

Claims

1. A photoluminescence color display comprising:

a display panel comprising a plurality of red, green and blue pixel areas;

an excitation source operable to generate excitation radiation for operating the display;

a photoluminescence color-elements plate comprising at least one of;

red quantum dots material corresponding to red pixel areas that is operable to emit red light in response to said excitation radiation;

green quantum dots material corresponding to green pixel areas that is operable to generate green light in response to said excitation radiation; and

blue quantum dots material corresponding to blue pixel areas that is operable to emit blue light in response to said excitation radiation; and

a wavelength selective filter disposed between the color-elements plate and the excitation source, the wavelength selective filter having a characteristic that allows the passage of excitation radiation and substantially prevents the passage of light generated by the photoluminescence materials of the photoluminescence color-elements plate.

2. The photoluminescence color display of claim 1, wherein the wavelength selective filter is substantially reflective to light generated by the photoluminescence materials.

3. The photoluminescence color display of claim 1, wherein the wavelength selective filter is configured to have a critical wavelength that is longer than the wavelength of the excitation radiation but shorter than the wavelength of light generated by said photoluminescence materials.

4. The photoluminescence color display of claim 1, wherein the wavelength selective filter comprises a dichroic filter.

5. The photoluminescence color display of claim 1, and further comprising a color filter plate located on a side of the display panel that is distal to the excitation source, wherein the color filter plate comprises at least one of:

first filter areas corresponding to red pixel areas of the display that are operable to allow the passage of red light;

second filter areas corresponding to green pixel areas of the display that are operable to allow the passage of green light; and

third filter areas corresponding to blue pixel areas of the display that are operable to allow the passage of blue light.

6. The photoluminescence color display of claim 1,

wherein the photoluminescence color-elements plate is disposed between the excitation source and a liquid crystal of the display panel, and

wherein said quantum dots materials comprise nano-crystals having a core and multiple shells containing different materials in an onion-like structure.

7. The photoluminescence color display of claim 6, wherein said quantum dots materials comprise cadmium free quantum dots.

8. The photoluminescence color display of claim 6, wherein said quantum dots materials comprise materials selected from the group consisting of:

cadmium selenide (CdSe);

cadmium zinc selenide (Cd_xZn_1-xSe);

cadmium zinc selenide sulfide (CdZnSeS);

cadmium selenide sulfide (CdSe_xS_1-x );

cadmium telluride (CdTe);

cadmium telluride sulfide (CdTe_xS _1-X), cadmium sulfide (CdS), cadmium zinc sulfide (Cd_xZn_1-xS);

indium phosphide (InP);

indium gallium phosphide (In_xGa_1-xP);

indium arsenide (InAs);

copper indium sulfide (CuInS₂);

copper indium selenide (CuInSe₂);

copper indium sulfide selenide (CuInS_xSe_2-x);

copper indium gallium sulfide (CuIn_xGa_1-xS2);

copper indium gallium selenide(CuIn_xGa_1-xSe₂);

copper gallium sulfide (CuGaS₂);

copper indium aluminum selenide (CuIn_xAl_1-xSe₂);

copper gallium aluminum selenide (CuGa_xAl_1-xSe₂);

copper indium sulfide zinc sulfide (CuInS_2xZnS_1-x); and

copper indium selenide zinc selenide (CuInSe_2xZnSe_1-x).

9. The photoluminescence color display of claim 6, wherein said quantum dots materials are deposited as a thin layer of quantum dots directly on a substrate using a contact printing process.

10. The photoluminescence color display of claim 6, wherein the wavelength selective filter is substantially reflective to light generated by the photoluminescence materials.

11. The photoluminescence color display of claim 6, wherein the wavelength selective filter is configured to have a critical wavelength that is longer than the wavelength of the excitation radiation but shorter than the wavelength of light generated by said photoluminescence materials.

12. The photoluminescence color display of claim 6, wherein the wavelength selective filter comprises a dichroic filter.

13. The photoluminescence color display of claim 6, and further comprising a color filter plate located on a side of the display panel that is distal to the excitation source, wherein the color filter plate comprises at least one of:

first filter areas corresponding to red pixel areas of the display that are operable to allow the passage of red light;

second filter areas corresponding to green pixel areas of the display that are operable to allow the passage of green light; and

third filter areas corresponding to blue pixel areas of the display that are operable to allow the passage of blue light.

14. The photoluminescence color display of claim 1, wherein said quantum dots materials comprise cadmium free quantum dots.

15. The photoluminescence color display of claim 1, wherein said quantum dots materials comprise materials selected from the group consisting of:

cadmium selenide (CdSe);

cadmium zinc selenide (Cd_xZn_1-xSe);

cadmium zinc selenide sulfide (CdZnSeS);

cadmium selenide sulfide (CdSe_xS_1-x);

cadmium telluride (CdTe);

cadmium telluride sulfide (CdTe_xS_1-x), cadmium sulfide (CdS), cadmium zinc sulfide (Cd_xZn_1-xS);

indium phosphide (InP);

indium gallium phosphide (In_xGa_1-xP);

indium arsenide (InAs);

copper indium sulfide (CuInS₂);

copper indium selenide (CuInSe₂);

copper indium sulfide selenide (CuInS_xSe_2-x);

copper indium gallium sulfide (CuIn_xGa_1-xS2);

copper indium gallium selenide(CuIn_xGa_1-xSe₂);

copper gallium sulfide (CuGaS₂);

copper indium aluminum selenide (CuIn_xAl_1-xSe₂);

copper gallium aluminum selenide (CuGa_xAl_1-xSe₂);

copper indium sulfide zinc sulfide (CuInS_2xZnS_1-x); and

copper indium selenide zinc selenide (CuInSe_2xZnSe_1-x).

16. The photoluminescence color display of claim 1, wherein said quantum dots materials comprise core/shell nano-crystals containing different materials in an onion-like structure.

17. The photoluminescence color display of claim 1, wherein said quantum dots materials are deposited as a thin layer of quantum dots directly on a substrate using a contact printing process.

18. A photoluminescence color display comprising:

a display panel comprising a plurality of red, green and blue pixel areas;

an excitation source operable to generate excitation radiation for operating the display;

a photoluminescence color-elements plate comprising at least one of;

red organic dye and red quantum dot materials corresponding to red pixel areas of the display that are operable to generate red light in response to said excitation radiation;

green organic dye and green quantum dot materials corresponding to the green pixel areas of the display that are operable to generate green light in response to said excitation radiation; and

blue organic dye and blue quantum dot materials corresponding to blue pixel areas of the display that are operable to generate blue light in response to said excitation radiation; and

a wavelength selective filter disposed between the color-elements plate and the excitation source, the wavelength selective filter having a characteristic that allows the passage of excitation radiation and substantially prevents the passage of light generated by the photoluminescence materials of the photoluminescence color-elements plate.

19. The photoluminescence color display of claim 18, wherein the wavelength selective filter is substantially reflective to light generated by the photoluminescence materials.

20. The photoluminescence color display of claim 18, wherein the wavelength selective filter is configured to have a critical wavelength that is longer than the wavelength of the excitation radiation but shorter than the wavelength of light generated by said photoluminescence materials.

21. The photoluminescence color display of claim 18, wherein the wavelength selective filter comprises a dichroic filter.

22. The photoluminescence color display of claim 18, and further comprising a color filter plate located on a side of the display panel that is distal to the excitation source, wherein the color filter plate comprises at least one of:

first filter areas corresponding to red pixel areas of the display that are operable to allow the passage of red light;

second filter areas corresponding to green pixel areas of the display that are operable to allow the passage of green light; and

third filter areas corresponding to blue pixel areas of the display that are operable to allow the passage of blue light.

23. The photoluminescence color display of claim 18,

wherein the photoluminescence color-elements plate is disposed between the excitation source and a liquid crystal of the display panel.

24. The photoluminescence color display of claim 23, wherein the excitation source is operable to generate blue excitation light.

25. The photoluminescence color display of claim 23, wherein the wavelength selective filter is substantially reflective to light generated by the photoluminescence materials.

26. The photoluminescence color display of claim 23, wherein the wavelength selective filter is configured to have a critical wavelength that is longer than the wavelength of the excitation radiation but shorter than the wavelength of light generated by said photoluminescence materials.

27. The photoluminescence color display of claim 23, wherein the wavelength selective filter comprises a dichroic filter.

28. The photoluminescence color display of claim 23, and further comprising a color filter plate located on a side of the display panel that is distal to the excitation source, wherein the color filter plate comprises at least one of:

first filter areas corresponding to red pixel areas of the display that are operable to allow the passage of red light;

second filter areas corresponding to green pixel areas of the display that are operable to allow the passage of green light; and

third filter areas corresponding to blue pixel areas of the display that are operable to allow the passage of blue light.

29. The photoluminescence color display of claim 23, wherein said quantum dots materials comprise cadmium free quantum dots.

30. The photoluminescence color display of claim 23, wherein said quantum dots materials comprise materials selected from the group consisting of:

cadmium selenide (CdSe);

cadmium zinc selenide (Cd_xZn_1-xSe);

cadmium zinc selenide sulfide (CdZnSeS);

cadmium selenide sulfide (CdSe_xS_1-x);

cadmium telluride (CdTe);

cadmium telluride sulfide (CdTe_xS_1-X), cadmium sulfide (CdS), cadmium zinc sulfide (Cd_xZn_1-xS);

indium phosphide (InP);

indium gallium phosphide (In_xGa_1-xP);

indium arsenide (InAs);

copper indium sulfide (CuInS₂);

copper indium selenide (CuInSe₂);

copper indium sulfide selenide (CuInS_xSe_2-x);

copper indium gallium sulfide (CuIn_xGa_1-xS2);

copper indium gallium selenide(CuIn_xGa_1-xSe₂);

copper gallium sulfide (CuGaS₂);

copper indium aluminum selenide (CuIn_xAl_1-x Se₂);

copper gallium aluminum selenide (CuGa_xAl_1-xSe₂);

copper indium sulfide zinc sulfide (CuInS_2xZnS_1-x); and

copper indium selenide zinc selenide (CuInSe_2xZnSe_1-x).

31. The photoluminescence color display of claim 23, wherein said quantum dots materials comprise core/shell nano-crystals containing different materials in an onion-like structure.

32. The photoluminescence color display of claim 23, wherein said quantum dots materials are deposited as a thin layer of quantum dots directly on a substrate using a contact printing process.

33. The photoluminescence color display of claim 18, wherein said quantum dots materials comprise cadmium free quantum dots.

34. The photoluminescence color display of claim 18, wherein said quantum dots materials comprise materials selected from the group consisting of:

cadmium selenide (CdSe);

cadmium zinc selenide (Cd_xZn_1-xSe);

cadmium zinc selenide sulfide (CdZnSeS);

cadmium selenide sulfide (CdSe_xS_1-x);

cadmium telluride (CdTe);

cadmium telluride sulfide (CdTe_xS_1-X), cadmium sulfide (CdS), cadmium zinc sulfide (Cd_xZn_1-xS);

indium phosphide (InP);

indium gallium phosphide (In_xGa_1-xP);

indium arsenide (InAs);

copper indium sulfide (CuInS₂);

copper indium selenide (CuInSe₂);

copper indium sulfide selenide (CuInS_xSe_2-x);

copper indium gallium sulfide (CuIn_xGa_1-xS2);

copper indium gallium selenide(CuIn_xGa_1-xSe₂);

copper gallium sulfide (CuGaS₂);

copper indium aluminum selenide (CuIn_xAl_1-xSe₂);

copper gallium aluminum selenide (CuGa_xAl_1-xSe₂);

copper indium sulfide zinc sulfide (CuInS_2xZnS_1-x); and

copper indium selenide zinc selenide (CuInSe_2xZnSe_1-x).

35. The photoluminescence color display of claim 18, wherein said quantum dots materials comprise core/shell nano-crystals containing different materials in an onion-like structure.

36. The photoluminescence color display of claim 18, wherein said quantum dots materials are deposited as a thin layer of quantum dots directly on a substrate using a contact printing process.