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1. (WO2018048841) PLAQUES DE GUIDE DE LUMIÈRE CONVERTISSANT LES COULEURS ET DISPOSITIFS COMPRENANT CELLES-CI
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

WHAT IS CLAIMED IS:

1. A light guide plate comprising:

a transparent substrate having a light incident surface and an opposing light emitting surface, wherein

the light incident surface comprises at least one light diffraction feature; and

at least one of the light incident surface and the light emitting surface comprises at least one color conversion feature.

2. The light guide plate of claim 1, wherein the at least one color conversion feature comprises a cavity containing a color conversion medium.

3. The light guide plate of claim 2, wherein the color conversion medium comprises at least one color converting element chosen from phosphors, quantum dots, and lumiphores.

4. The light guide plate of claim 2, wherein the cavity is hermetically sealed.

5. The light guide plate of claim 2, wherein the cavity comprises a recess in at least one of the light emitting surface and the light incident surface.

6. The light guide plate of claim 2, further comprising a sealing layer bonded to at least one of the light emitting surface and the light incident surface of the transparent substrate, and wherein the cavity comprises a region between the light emitting surface and the sealing layer or between the light incident surface and the sealing layer.

7. The light guide plate of claim 6, wherein the sealing layer is transparent.

8. The light guide plate of claim 6, wherein the sealing layer is reflective or partially reflective.

9. The light guide plate of claim 6, wherein the sealing layer is discontinuous.

10. The light guide plate of claim 1, wherein the transparent substrate is patterned with a plurality of light extraction features.

11. The light guide plate of claim 10, wherein the plurality of light extraction features comprises surface or sub-surface light extraction features.

12. The light guide plate of claim 10, wherein the plurality of light extraction features comprises a gradient pattern.

13. The light guide plate of claim 12, wherein the gradient pattern is periodic.

14. The light guide plate of claim 1, wherein the transparent substrate is chosen from glass and plastic substrates.

15. The light guide plate of claim 1, wherein the transparent substrate comprises a glass having the following composition:

55-75 wt% Si02;

5-25 wt% A1203;

1-15 wt% MgO;

0-1% wt% Sn02;

5-15 wt% Na20;

0-5 wt% SrO; and

0-10 wt% B203.

16. The light guide plate of claim 15, wherein the glass comprises at least one of:

less than 200 ppm Fe203;

less than 2 ppm Cr203; or

less than 2 ppm NiO.

17. The light guide plate of claim 1, wherein the at least one light diffraction feature comprises an array of periodic or chirped diffraction gratings.

18. The light guide plate of claim 17, wherein the diffraction gratings comprise a polymeric or metallic layer patterned on the light incident surface of the transparent substrate.

19. The light guide plate of claim 17, wherein the diffraction gratings comprise one or more laser-damaged, ion-exchanged, or crystallized regions of the transparent substrate.

20. An optical assembly comprising the light guide plate of claim 1 optically coupled to at least one light source.

21. The optical assembly of claim 20, wherein the at least one light source is optically coupled to the light incident surface of the transparent substrate.

22. The optical assembly of claim 20, wherein the at least one light source is a diode emitting ultraviolet, near-ultraviolet, or blue light.

23. The optical assembly of claim 20, wherein the transparent substrate comprises a plurality of light extraction features arranged in a pattern to produce a substantially spatially uniform transmission of light from the at least one light source.

24. The optical assembly of claim 20, wherein the at least one light diffraction feature is positioned in overlying registration with the at least one light source.

25. The optical assembly of claim 20, wherein the at least one light diffraction feature is configured to direct propagation of light from the at least one light source to a predetermined color conversion feature.

26. A display, lighting, or electronic device comprising the optical assembly of claim 20.

27. A method of making an optical assembly, the method comprising:

forming at least one light diffraction feature on a light incident surface of a transparent substrate;

forming at least one color conversion feature on at least one of the light incident surface and an opposing light emitting surface of the transparent substrate; and

optically coupling at least one light source to the at least one light diffraction feature.

28. The method of claim 27, further comprising patterning the transparent substrate with a plurality of light extraction features.

29. The method of claim 28, wherein patterning the plurality of light extraction features comprises printing or laser damaging.

30. The method of claim 27, wherein forming the at least one light diffraction feature comprises patterning a polymeric or metallic layer on the light incident surface by lithography, microreplication, 3D printing, or holographic printing processes.

31. The method of claim 27, wherein forming the at least one light diffraction feature comprises modifying the light incident surface by ion exchange, laser exposure, or localized devitrification and recrystallization processes.

32. The method of claim 27, wherein forming the at least one color conversion feature comprises placing a color conversion medium in at least one cavity of at least one of the light emitting surface or the light incident surface.

33. The method of claim 32, further comprising hermetically sealing the at least one cavity.

34. The method of claim 27, wherein forming the at least one color conversion feature comprises:

patterning a color conversion medium on at least one of the light emitting surface and the light incident surface; and

depositing a sealing layer to encapsulate the color conversion medium.

35. The method of claim 34, wherein the sealing layer is deposited by vapor deposition or sputtering.