Pixel designs for multi-domain vertical alignment liquid crystal display

• US 20080225212A1
• Filed: 03/13/2007
• Published: 09/18/2008
• Est. Priority Date: 03/13/2007
• Status: Abandoned Application

• Current Assignee: Kopin Corporation
• Original Assignee: Kopin Corporation
• Inventors: Ong, Hiap L.
• Application Number:
  US11/717,602
• Publication Number:
  US 20080225212A1
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0281 Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

An MVA display includes a plurality of repeats between a first substrate and a second substrate, each of which includes at least one full color pixel, and a drive circuit for driving the plurality of repeats. Each full color pixel includes at least one color dot for each of red, blue and green. Color dots contiguous between at least two adjoining repeats in a row have different colors from each other. Each color dot includes a common electrode, a pixel electrode and a liquid crystal component having a negative dielectric anisotropy between the common electrode and the pixel electrode. The common electrode is common among at least a portion of the repeats. The drive circuit causes color dots contiguous between at least two adjoining repeats in a row to have different polarities from each other.

Claims

1. A multi-domain vertical alignment display, comprising:

a) a plurality of repeats between a first substrate and a second substrate, each repeat including at least one full color pixel, each full color pixel including at least one color dot for each of red, blue and green, wherein each color dot includes;

i) a common electrode;

ii) a pixel electrode; and

iii) a liquid crystal component between the common electrode and the pixel electrode, the liquid crystal material having negative dielectric anisotropy,

wherein the common electrode is common among at least a portion of the repeats, and wherein color dots contiguous between at least two adjoining repeats in a row have different colors from each other;

b) a drive circuit causing color dots contiguous between at least two adjoining repeats in a row to have different polarities from each other.

2. The multi-domain vertical alignment display of claim 1, wherein said each color dot further includes a color filter material of red, blue or green.

3. The multi-domain vertical alignment display of claim 1, wherein at least one color dot of at least one repeat has a different polarity from the polarity of all neighboring contiguous color dots thereof.

4. The multi-domain vertical alignment display of claim 1, wherein the full color pixel is in an L-shape or a quadrilateral.

5. The multi-domain vertical alignment display of claim 4, wherein the full color pixel consists essentially of one red color dot, one green color dot and one blue color dot.

6. The multi-domain vertical alignment display of claim 4, wherein the quadrilateral is a trapezoid.

7. The multi-domain vertical alignment display of claim 4, wherein the quadrilateral is a parallelogram.

8. The multi-domain vertical alignment display of claim 7, wherein the full color pixel consists essentially of four color dots.

9. The multi-domain vertical alignment display of claim 8, wherein the full color pixel includes two color dots for one of red, blue and green.

10. The multi-domain vertical alignment display of claim 9, wherein the full color pixel includes two green color dots, one red color dot and one blue color dot.

11. The multi-domain vertical alignment display of claim 8, wherein the full color pixel includes white, red, green and blue color dots.

12. The multi-domain vertical alignment display of claim 1, wherein each repeat includes at least two full color pixels.

13. The multi-domain vertical alignment display of claim 12, wherein each repeat includes a pair of full color pixels, each of which is complementary to each other in shape.

14. The multi-domain vertical alignment display of claim 13, wherein the pair of full color pixels in combination form a square, rectangle or hexagon.

15. The multi-domain vertical alignment display of claim 1, wherein the common electrode is planar.

16. The multi-domain vertical display of claim 15, wherein each pixel electrode of at least one full color pixel is planar.

17. The multi-domain vertical alignment display of claim 1, wherein each color dot of at least one full color pixel has a plan dimension on each side of between about 3 μ

m and about 50 μ

m.

18. The multi-domain vertical alignment display of claim 16, wherein each color pixel of at least one full color pixel has dimensions of between about 5 μ

m×

about 15 μ

m and about 15 μ

m×

about 15 μ

m.

19. The multi-domain vertical alignment display of claim 18, wherein each color dot of at least one full color pixel has dimensions of about 7.5 μ

m×

about 10 μ

m.

20. The multi-domain vertical alignment display of claim 18, wherein each color pixel of at least one full color pixel has dimensions of about 7.5 μ

m×

about 7.5 μ

m.

21. The multi-domain vertical alignment display of claim 1, wherein each pixel electrode of at least one full color pixel is essentially quadrilateral.

22. The multi-domain vertical alignment display of claim 21, wherein each pixel electrode of at least one full color pixel is essentially square.

23. The multi-domain vertical alignment display of claim 1, wherein each color dot of at least one full color pixel creates a four-domain vertical alignment display.

24. The multi-domain vertical alignment display of claim 1, further including a first vertical liquid crystal alignment layer at the first substrate and a second vertical liquid crystal alignment layer at the second substrate, whereby the liquid crystal is between the first and second alignment layers.

25. The multi-domain vertical alignment display of claim 24, wherein the gap between the first and second vertical liquid crystal alignment layers is less than about 5 μ

m.

26. The multi-domain vertical alignment display of claim 24, wherein at least one of the first and second vertical liquid crystal alignment layers includes a polyimide layer.

27. The multi-domain vertical alignment display of claim 26, wherein at least one of the first and second vertical liquid crystal alignment layers includes a spin-on polyimide layer.

28. The multi-domain vertical alignment display of claim 1, further including an optical compensation film over each repeat of at least one full color pixel to improve the viewing angle of the display.

29. The multi-domain vertical alignment display of claim 28, wherein the optical compensation film is a negative birefringence anisotropic optical film.

30. The multi-domain vertical alignment display of claim 29, wherein the optical film is a uniaxial film or a biaxial film.

31. The multi-domain vertical alignment display of claim 1, further including a head mount supporting the plurality of repeats.

32. The multi-domain vertical alignment display of claim 1, wherein the display includes a display resolution of at least 320×

240×

3 dots.

33. A method of preparing a multi-domain vertical alignment liquid crystal display, comprising the steps of:

a) forming a plurality of repeats between a first substrate and a second substrate, each repeat including at least one full color pixel, each full color pixel including at least one color dot for each of red, blue and green, wherein each color dot includes;

i) a common electrode;

ii) a pixel electrode;

iii) a liquid crystal component between the common electrode and the pixel electrode, the liquid crystal material having negative dielectric anisotropy,

wherein the common electrode is common among at least a portion of the repeats, and wherein color dots contiguous between at least two adjoining repeats in a row have different colors from each other; and

b) forming a drive circuit causing color dots contiguous between at least two adjoining repeats in a row to have different polarities from each other.

34. The method of claim 33, wherein at least one color dot of at least one repeat has a different polarity from the polarity of all neighboring contiguous color dots thereof.

35. The method of claim 33, wherein each color dot has a plan dimension on each side of between about 3 μ

m and about 50 μ

m.

36. The method of claim 33, wherein the full color pixel is a parallelogram.

37. The method of claim 33, wherein each repeat includes at least two full color pixels.

38. The method of claim 37, wherein each repeat includes a pair of full color pixels, each of which is complementary to each other in shape.

39. The method of claim 38, wherein the pair of full color pixels in combination form a square, rectangle or hexagon.

40. The method of claim 33, wherein the first common electrode is planar.

41. The method of claim 40, wherein each pixel electrode of at least one full color pixel is planar.

42. The method of claim 33, further including the step of forming a color filter material of red, blue or green at the first substrate or the second substrate.

43. The method of claim 33, further including the step of forming a first vertical liquid crystal alignment layer at the first substrate and a second vertical liquid crystal alignment layer at the second substrate, whereby the liquid crystal is between the first and second alignment layers.

44. The method of claim 43, wherein at least one of the alignment layers includes a spin-on polyimide layer.

45. The method of claim 33, further including the step of forming a head mount supporting the plurality of repeats.