Thin backlight for LCD displays through use of field-induced polymer electro luminescence panels

• US 9,494,822 B2
• Filed: 03/07/2013
• Issued: 11/15/2016
• Est. Priority Date: 03/07/2013
• Status: Active Grant

• Current Assignee: VIZIO, Inc.
• Original Assignee: VIZIO, Inc.
• Inventors: McRae, Matthew
• Primary Examiner(s): Lee, Paul
• Assistant Examiner(s): PAN, JIA X
• Application Number:
  US13/789,392
• Publication Number:
  US 20140253839A1
• Time in Patent Office: 1,349 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light

Abstract

A FIPEL device used as an illuminating part for a display.

Claims

1. A display system, comprising

an emissive body, formed of a first substrate having a first conductive thin film, a dielectric layer formed directly on said first substrate, an emissive layer, formed directly on the dielectric layer, said emissive layer has mixed polymer and a second substrate having a second conductive thin film thereon, formed on a said emissive layer,

said emissive body having a flat light emitting surface, said emissive body emitting light continuously and evenly from a whole area of the flat light emitting surface, and said emissive body emitting light continuously and evenly over a whole area of light incident surface of a pixel controllable device,

said pixel controllable device, having a polarizer film connected directly to the light emitting surface without an air gap, a color film connected to a polarizer film without an air gap, and a pixel controllable panel connected to the color film without an air gap;

and

a signal generator, outputting an alternating current between said first conductive thin film and said second conductive thin film, to cause the emissive layer to emit light at specific wavelengths depending on the frequency of alternating current.

2. The display system as in claim 1, wherein said emissive body has a thickness less than 0.1 inch over the area.

3. The display system as in claim 1, wherein said emissive body emits light from both a front and a back of the area.

4. The display system as in claim 1, wherein the display system has a front shell and a rear shell.

5. The display system as in claim 4, wherein the rear shell is formed of a non-reflective material.

6. The display system as in claim 1, wherein said pixel controllable device is a liquid crystal device or an electrowetted device.

7. The display system as in claim 1, wherein the display system is a television.

8. This display system as in claim 6, wherein the display system is in a portable computer.

9. The display system as in claim 8, wherein said portable computer is one of a tablet, cell phone, PDA.

10. The display system as in claim 1, wherein said pixel controllable device having a TFT, or said pixel controllable device is operated in VA mode or IPS mode.

11. The display system as in claim 1, wherein said emissive body has a non-symmetrical stack of materials from its top to its bottom.

12. The display system as in claim 1, wherein said emissive body has a symmetrical stack of materials from its top to its bottom.

13. The display system as in claim 1, further comprising a connection to a computer that creates an output signal that sets said frequency of the alternating current.

14. The display system as in claim 1, wherein said first and second substrates are glass substrates.

15. The display system as in claim 1, wherein said emissive layer is a mix of poly (N-vinylcarbazole):

fac-tris(2-phenylpyri-dine)iridium(III) with Nano Tubes therein.

16. The display system as in claim 15, wherein a concentration of Nano Tubes to the polymer mix is approximately 0.04% by weight.

17. A display system, comprising

a housing, having a rear part, and a front part, having an area for a display in said front part;

an emissive body having a flat light emitting surface, and said emissive boy emitting light continuously and evenly from a whole area of the flat light emitting surface, and emissive body emitting light continuously and evenly over a whole are of a light incident surface of a pixel controllable device, and said emissive body attached directly against said rear part of said housing,

said emissive body, formed of a substrate having a first conductive thin film, a dielectric layer formed directly on said first substrate, an emissive layer, formed directly on the dielectric layer, said emissive layer has a mixed polymer and a second substrate having a second conductive thin film thereon, formed on said emissive layer;

said pixel controllable device, having a polarizer film connected directly to the light emitting surface without an air gap, color film connected to the polarizer film without an air gap, and a pixel controllable panel connected to the color film without an air gap; and

a signal generator, outputting an alternating current between said conductive thin film and said second conductive thin film, to cause the emissive layer to emit light at specific wavelengths depending on the frequency of the alternating current.

18. The display system as in claim 17, wherein said emissive body has a thickness less than 0.1 inch over the area.

19. The display system as in claim 17, wherein said emissive body emits light from both front and back of the display.

20. The display system as in claim 17, wherein the rear part is formed of a non-reflective material.

21. The display system as in claim 17, wherein said pixel controllable device is a liquid crystal device or an electrowetted device.

22. The display system as in claim 17, wherein the display system is a television.

23. The display system as in claim 17, wherein the display system is in a portable computer.

24. The display system as in claim 23, wherein said portable computer is one of a tablet, cell phone, PDA.

25. The display system as in claim 17, wherein said pixel controllable device having a TFT, or said pixel controllable device is operated in VA mode or in IPS mode.

26. The display system as in claim 17, wherein said emissive body has a non-symmetrical stack of materials from its top to its bottom.

27. The display system as in claim 17, wherein said emissive body has a symmetrical stack of materials from its top to its bottom.

28. The display system as in claim 17, further comprising a connection to a computer that creates an output signal that sets said frequency of the alternating current.

29. The display system as in claim 17, wherein said first and second substrates are glass substrates.

30. The display system as in claim 17, wherein said emissive layer is a mix of poly (N-vinylcarbazole):

fac-tris(2-phenylpyri-dine)iridium(III) with Nano Tubes therein.

31. The display system as in claim 30, wherein a concentration of nanotubes Nano Tubes to the polymer mix is approximately 0.04% by weight.