TWISTED NEMATIC LIQUID CRYSTAL DISPLAY DEVICES

• US 20070206132A1
• Filed: 07/11/2006
• Published: 09/06/2007
• Est. Priority Date: 03/02/2006
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Jen, Tean-Sen, Chao, Shih-Min, Lin, Wei-Chi
• Application Number:
  US11/456,582
• Publication Number:
  US 20070206132A1
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G02F 2203/30 Gray scale

Abstract

A liquid crystal display device comprising an upper substrate, a lower substrate, and a liquid crystal layer filled between the upper substrate and the lower substrate. A color filter layer and a first alignment layer are disposed on an inner surface of the upper substrate and adjacent to the liquid crystal. An array of transistors and a second alignment layer are disposed on an inner surface of the lower substrate and adjacent to the liquid crystal. An upper polarizer and a lower polarizer are respectively disposed on both sides the liquid crystal display panel, wherein the upper polarizer is disposed on an outer side of the upper substrate and the lower polarizer is disposed on an outer surface of the lower substrate, and wherein the upper polarizer comprises a plurality of microparticles. The first alignment layer provides a first orientation and the second alignment layer provides a second orientation. The first and the second orientations are substantially perpendicular to each other and substantially parallel to lateral sides of the liquid crystal display panel.

Claims

1. A liquid crystal display, comprising:

a liquid crystal display panel comprising an upper substrate, a lower substrate, a liquid crystal layer interposed between the upper and the lower substrates, a color filter and a first alignment layer disposed on an inner surface of the upper substrate and adjacent to the liquid crystal layer, an array of transistors and a second alignment layer disposed on an inner surface of the lower substrate and adjacent to the liquid crystal layer; and

an upper polarizer and a lower polarizer respectively disposed on both sides of the liquid crystal display panel, wherein the upper polarizer is disposed on an outer side of the upper substrate and the lower polarizer is disposed on an outer surface of the lower substrate, and wherein the upper polarizer comprises a plurality of microparticles;

wherein the first alignment layer provides a first orientation and the second alignment layer provides a second orientation, and wherein the first and the second orientations are substantially perpendicular or parallel to each other and substantially parallel or perpendicular to lateral sides of the liquid crystal display panel.

2. The liquid crystal display as claimed in claim 1, wherein the upper polarizer comprises a diffusive layer, and wherein the plurality of microparticles are dispersed in the diffusive layer.

3. The liquid crystal display as claimed in claim 2, wherein the diffusive layer is disposed on an outer surface of the upper polarizer.

4. The liquid crystal display as claimed in claim 2, wherein the diffusive layer is disposed between the upper polarizer and the upper substrate.

5. The liquid crystal display as claimed in claim 1, wherein each one of the upper and lower polarizers comprises a discotic liquid crystal layer.

6. The liquid crystal display as claimed in claim 1, wherein each one of the upper and lower polarizers comprises a nematic liquid crystal layer.

7. The liquid crystal display as claimed in claim 1, further comprising a signal driving module and a back light module illuminating the liquid crystal display panel.

8. The liquid crystal display as claimed in claim 1, further comprising a common electrode disposed on the inner surface of the upper substrate, and a pixel electrode disposed on the inner surface of the lower substrate.

9. The liquid crystal display as claimed in claim 8, wherein when an electric field is generated between the pixel electrode and the common electrode, the plurality of microparticles diffuse light from the back light module.

10. The liquid crystal display as claimed in claim 1, further comprising a plurality of common electrodes disposed on the inner surface of the lower substrate, and a plurality of pixel electrodes disposed on the inner surface of the lower substrate.

11. The liquid crystal display as claimed in claim 1, wherein the plurality of microparticles are spherical or semi-spherical or conical, or pyramidal or spheroidal, or discoidal, or circular with a diameter less than 30 μ

m.

12. The liquid crystal display as claimed in claim 1, wherein the upper polarizer comprises a first transmissive axis substantially perpendicular to the first orientation, and the lower polarizer comprises a second transmissive axis substantially perpendicular to the second orientation.

13. The liquid crystal display as claimed in claim 1, wherein the upper polarizer comprises a first transmissive axis substantially parallel to the first orientation, and the lower polarizer comprises a second transmissive axis substantially parallel to the second orientation.

14. The liquid crystal display as claimed in claim 1, wherein the liquid crystal layer is a twist-oriented nematic liquid crystal layer, wherein the twist angle varies within the range of 0 to 100 degrees.

25. The liquid crystal display as claimed in claim 14, wherein the liquid crystal layer is a twist-oriented nematic liquid crystal layer, wherein the twist angle varies within the range of 0 to 100 degrees.

15. A liquid crystal display, comprising:

a liquid crystal display panel comprising an upper substrate, a lower substrate, a liquid crystal layer interposed between the upper and the lower substrates, a color filter and a first alignment layer disposed on an inner surface of the upper substrate and adjacent to the liquid crystal, an array of transistors and a second alignment layer disposed on an inner surface of the lower substrate and adjacent to the liquid crystal, wherein the color filter comprises a plurality of microparticles; and

an upper polarizer and a lower polarizer respectively disposed on both sides the liquid crystal display panel, wherein the upper polarizer is disposed on the top of the upper substrate and the lower polarizer is disposed on the bottom of the lower substrate;

wherein the first alignment layer provides a first orientation and the second alignment layer provides a second orientation, and wherein the first and the second orientations are substantially perpendicular or parallel to each other and substantially parallel with lateral sides of the liquid crystal display panel.

16. The liquid crystal display as claimed in claim 15, wherein each one of the upper and lower polarizers comprises a discotic liquid crystal layer.

17. The liquid crystal display as claimed in claim 15, wherein each one of the upper and lower polarizers comprises a nematic liquid crystal layer.

18. The liquid crystal display as claimed in claim 15, further comprising a signal driving module and a back light module illuminating the liquid crystal display panel.

19. The liquid crystal display as claimed in claim 15, further comprising a common electrode disposed on the inner surface of the upper substrate, and a pixel electrode disposed on the inner surface of the lower substrate.

20. The liquid crystal display as claimed in claim 19, wherein when an electric field is generated between the pixel electrode and the common electrode, the plurality of microparticles diffuse light from the back light module.

21. The liquid crystal display as claimed in claim 15, further comprising a plurality of common electrodes disposed on the inner surface of the lower substrate, and a plurality of pixel electrodes disposed on the inner surface of the lower substrate.

22. The liquid crystal display as claimed in claim 15, wherein the plurality of microparticles are spherical or semi-spherical or conical, or pyramidal or spheroidal, or discoidal, or circular with a diameter less than 30 μ

m.

23. The liquid crystal display as claimed in claim 15, wherein the upper polarizer comprises a first transmissive axis substantially perpendicular to the first orientation, and the lower polarizer comprises a second transmissive axis substantially perpendicular to the second orientation.

24. The liquid crystal display as claimed in claim 15, wherein the upper polarizer comprises a first transmissive axis substantially parallel to the first orientation, and the lower polarizer comprises a second transmissive axis substantially parallel to the second orientation.

26. A liquid crystal display, comprising:

a liquid crystal display panel comprising an upper substrate, a lower substrate, a liquid crystal layer interposed between the upper and the lower substrates, a color filter and a first alignment layer disposed on an inner surface of the upper substrate and adjacent to the liquid crystal layer, an array of transistors and a second alignment layer disposed on an inner surface of the lower substrate and adjacent to the liquid crystal layer; and

an upper polarizer and a lower polarizer respectively disposed on both sides of the liquid crystal display panel, wherein the upper polarizer is disposed on an outer side of the upper substrate and the lower polarizer is disposed on an outer surface of the lower substrate, and wherein a plurality of microparticles is disposed in the upper polarizer or color filter;

wherein said first and second alignment layers for aligning liquid crystal molecules being substantially perpendicular to the surface of said alignment layers while no voltage is applied.

27. The liquid crystal display as claimed in claim 26, wherein the upper polarizer comprises a diffusive layer, and wherein the plurality of microparticles are dispersed in the diffusive layer.

28. The liquid crystal display as claimed in claim 27, wherein the diffusive layer is disposed on an outer surface of the upper polarizer.

29. The liquid crystal display as claimed in claim 27, wherein the diffusive layer is disposed between the upper polarizer and the upper substrate.

30. The liquid crystal display as claimed in claim 26, wherein the plurality of microparticles are spherical or semi-spherical or conical, or pyramidal or spheroidal, or discoidal, or circular with a diameter less than 30 μ

m.

31. The liquid crystal display as claimed in claim 26, wherein each one of the upper and lower polarizers comprises a discotic liquid crystal layer.

32. The liquid crystal display as claimed in claim 26, wherein each one of the upper and lower polarizers comprises a nematic liquid crystal layer.

33. The liquid crystal display as claimed in claim 26, further comprising a signal driving module and a back light module illuminating the liquid crystal display panel.

34. The liquid crystal display as claimed in claim 26, further comprising a common electrode disposed on the inner surface of the upper substrate, and a pixel electrode disposed on the inner surface of the lower substrate.