Display device using vertical cavity laser arrays

• US 20050275615A1
• Filed: 06/09/2004
• Published: 12/15/2005
• Est. Priority Date: 06/09/2004
• Status: Active Grant

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Kahen, Keith B., Montbach, Erica N.
• Granted Patent: US 7,262,758 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 2202/046 fluorescent

Abstract

A display apparatus for producing colored pixelated light includes a backlight unit for providing a pump-beam light. The apparatus also includes a microcavity light-producing array responsive to pump-beam light and having pixels wherein each pixel including a transparent substrate, a bottom dielectric stack reflective to light over a predetermined range of wavelengths, an active region responsive to pump-beam light for producing display light, and a top dielectric stack spaced from the bottom dielectric stack and reflective to light over a predetermined range of wavelengths. The apparatus further includes a light shutter for permitting selected display light from the microcavity light-producing array to pass therethrough, a polarizing layer disposed between the microcavity light-producing array and the light shutter, and a beam expander disposed over the light shutter for increasing the angular cone of view of the display light.

Claims

1. A display apparatus for producing colored pixelated light, comprising:

a) a backlight unit for providing a pump-beam light;

b) a microcavity light-producing array responsive to pump-beam light and having pixels wherein each pixel includes;

i) a transparent substrate;

ii) a bottom dielectric stack reflective to light over a predetermined range of wavelengths;

iii) an active region responsive to pump-beam light for producing display light; and

iv) a top dielectric stack spaced from the bottom dielectric stack and reflective to light over a predetermined range of wavelengths;

c) a light shutter for permitting selected display light from the microcavity light-producing array to pass therethrough;

d) a polarizing layer disposed between the microcavity light-producing array and the light shutter; and

e) a beam expander disposed over the light shutter for increasing the angular cone of view of the display light.

2. The display apparatus of claim 1 wherein the active region of different pixels produces different colored display light in response to the pump-beam light.

3. The display apparatus of claim 1 wherein pump-beam light is transmitted and introduced into the active region through at least one of the dielectric stacks.

4. The display apparatus of claim 1 wherein the light shutter includes at least one layer having liquid crystals which are responsive to an applied field for permitting selected display light to pass through and means for applying the field to selected portions of the liquid crystal layer.

6. The display apparatus of claim 1 wherein the light shutter includes at least one layer having electrowetting switches.

7. The display apparatus of claim 1 wherein the backlight unit includes light emitting diodes or cold cathode fluorescent lamps.

8. The display apparatus of claim 1 wherein the active region includes one or more periodic gain region(s) and spacer layers disposed on either side of the periodic gain region(s) and arranged so that the periodic gain region(s) is aligned with the antinodes of the device'"'"'s standing wave electromagnetic field.

9. The display apparatus of claim 8 wherein the periodic gain region(s) of different pixels produce red, green, or blue light.

10. The display apparatus of claim 8 wherein the periodic gain region(s) includes an organic host material and a dopant.

11. The display apparatus of claim 8 wherein the spacer layers are substantially transparent to pump-beam light and the microcavity light.

12. The display apparatus of claim 11 wherein the spacer layers include 1,1-Bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane or silicon dioxide.

13. The display apparatus of claim 10 wherein the portions of the periodic gain region(s) producing green light include the host material of aluminum tris(8-hydroxyquinoline) and the dopant of [10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-[1]Benzopyrano[6,7,8-ij]quinolizin-11-one].

14. The display apparatus of claim 10 wherein the portions of the periodic gain region(s) producing red light includes the host material of aluminum tris(8-hydroxyquinoline) and the dopant of [4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran].

15. The display apparatus of claim 10 wherein the portions of the periodic gain region(s) producing blue light includes the host material of 2-tert-butyl-9,10-di-naphthalen-2-yl-anthracene and the dopant of 2,5,8,11-tetrakis(1,1-dimethylethyl)-perylene.

16. The display apparatus of claim 8 wherein the periodic gain region(s) includes polymeric materials.

17. The display apparatus of claim 8 wherein the periodic gain region(s) includes inorganic nanoparticles.

5. The display apparatus of claim I wherein the light shutter includes at least one layer of polarizing film.

18. A display apparatus for producing colored pixelated light, comprising:

a) a backlight unit for providing a pump-beam light;

b) a microcavity light-producing array responsive to pump-beam light and having pixels wherein each pixel includes;

i) a transparent substrate;

ii) a bottom dielectric stack reflective to light over a predetermined range of wavelengths;

iii) an active region responsive to pump-beam light for producing blue light; and

iv) a top dielectric stack spaced from the bottom dielectric stack and reflective to light over a predetermined range of wavelengths;

c) a light shutter for permitting selected colored light from the microcavity light-producing array to pass therethrough;

d) a polarizing layer disposed between the microcavity light-producing array and the light shutter; and

e) a color conversion layer including different portions where selected different portions in response to blue light produce a different colored light and being adapted to increase the angular cone of view of the selected colored light.

19. The display apparatus of claim 18 wherein the color conversion layer includes different color change materials to produce red and green colored display light.

20. The display apparatus of claim 18 further including a third dielectric stack disposed on top of the light shutter for reflecting red and green light from the color conversion layer.

21. The display apparatus of claim 18 wherein pump-beam light is transmitted and introduced into the active region through at least one of the dielectric stacks.

22. The display apparatus of claim 18 wherein the light shutter includes at least one layer having liquid crystals which are responsive to an applied field for permitting selected display light to pass through and means for applying the field to selected portions of the liquid crystal layer.

23. The display apparatus of claim 18 wherein the light shutter includes at least one layer of polarizing film.

24. The display apparatus of claim 18 wherein the light shutter includes at least one layer having electrowetting switches.

25. The display apparatus of claim 18 wherein the backlight unit includes light emitting diodes or cold cathode fluorescent lamps.

26. The display apparatus of claim 18 wherein the active region includes one or more periodic gain region(s) and spacer layers disposed on either side of the periodic gain region(s) and arranged so that the periodic gain region(s) is aligned with the antinodes of the device'"'"'s standing wave electromagnetic field.

27. The display apparatus of claim 26 wherein the periodic gain region(s) includes an organic host material and a dopant.

28. The display apparatus of claim 26 wherein the spacer layers are substantially transparent to pump-beam light and the microcavity light.

29. The display apparatus of claim 28 wherein the spacer layers include 1,1-Bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane or silicon dioxide.

30. The display apparatus of claim 27 wherein the portions of the periodic gain region(s) producing blue light includes the host material of 2- tert-butyl-9,10-di-naphthalen-2-yl-anthracene and the dopant of 2,5,8,11-tetrakis(1,1-dimethylethyl)-perylene.

31. The display apparatus of claim 26 wherein the periodic gain region(s) includes polymeric materials.

32. The display apparatus of claim 26 wherein the periodic gain region(s) includes inorganic nanoparticles.