Vertical alignment liquid crystal displays with high transmittance and wide view angle
View Patent ↗Structures, devices, systems and methods of using multi-domain vertical alignment liquid crystal displays with high transmittance, high contrast ratio and wide view angle in which at least one of the electrode substrates has circular or ring-shaped openings, such as holes or slits. Circular or ring-shaped patterns for openings and electrodes have not been used in the construction of a liquid crystal display. The new multi-domain vertical alignment (MDVA) liquid crystal display is particularly suitable for liquid crystal display television and computer monitor applications.
1. A multi-domain vertical alignment liquid crystal display with high transmittance, high contract ratio and wide view angle comprising:
a first substrate including a common electrode having a ring shape and a circular center separated by a ring-shaped first substrate area and connected together by a common radial connector between the ring shape and circular center, the first substrate separated by a space from a second substrate including a pixel electrode having a ring-shaped opening and a circular center opening aligned to form a mirror image of the common electrode and having a signal radial connector between ring-shaped pixel electrode areas, the second substrate positioned opposite the first substrate;
a liquid crystal material filling the space between the first substrate and the second substrate; and
the common electrode and pixel electrodes controlled by a storage electrode.
2. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the liquid crystal materials filling the space between the first and second substrates form a liquid crystal cell with negative dielectric constant anisotropy.
3. A multi-domain vertical alignment liquid crystal display of claim 2 , wherein the liquid crystal cell is nematic liquid crystal material with chiral dopants.
4. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the liquid crystal display further comprises aligning layers formed on the first and second substrates for liquid crystal vertical alignment.
5. A multi-domain vertical alignment liquid crystal display of claim 4 , wherein the aligning layers are selected from at least one of polymeric material and inorganic material.
6. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the liquid crystal display further comprises two liner polarizer's that form a crossed polarizer and at least one linear polarizer is disposed on the exterior surface of the liquid crystal cell.
7. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the diameter of ring-shaped openings of the first substrate are of a size selected from at least one of smaller, equal to and larger than that of the corresponding ring-shaped openings of the second substrate.
8. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the opening area in the first substrate and the second substrate is formed by at least one of etching and photolithography on a conductive electrode surface.
9. A multi-domain vertical alignment liquid crystal display of claim 8 , wherein the opening area is at least one of the following shapes: rings, circles, round holes, and circular slits.
10. A multi-domain vertical alignment liquid crystal display of claim 9 , wherein the diameter of the opening area is not less than approximately 2 μm.
11. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the liquid crystal display further comprises at least one compensation film disposed between a polarizer and one of the first substrate and the second substrate.
12. A multi-domain vertical alignment liquid crystal display of claim 11 , wherein the compensation film is a combination of negative birefringence and uni-axial birefringence.
13. A multi-domain vertical alignment liquid crystal display of claim 11 , wherein the compensation film is selected from at least one of a negative c-plate and a positive a-plate.
14. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the first substrate structure includes plural first ring-shaped openings each around a centrally located circularly-shaped common electrode and plural ring-shaped common electrodes each centered around one of the plural first ring-shaped openings on the first substrate and plural second ring-shaped openings each around one of the plural ring-shaped common electrodes, the second substrate structure includes plural centrally located circularly-shaped openings corresponding to the plural circularly-shaped common electrode and plural ring-shaped openings each corresponding to one of the plural ring shaped common electrodes to form the mirror image.
15. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the common and pixel radial connectors each comprise:
one single common radial connector and one single signal radial connector from a center and each extending in an opposite direction from the center.
16. A multi-domain vertical alignment liquid crystal display of claim 1 , wherein the common and pixel radial connectors each comprise:
a crossed-connection radial connector having more than one connection parts.
17. A multi-domain vertical alignment liquid crystal display with high transmittance, high contract ratio and wide view angle comprising:
a first substrate including a common electrode, the first substrate having a first ring-shaped opening around a centrally located, circular-shaped common electrode, a ring-shaped common electrode around the first ring-shaped opening and a second ring-shaped opening around the ring-shaped common electrode and a radial common connector between the circular-shaped and ring-shaped common electrodes;
a second substrate separated by a space from the first substrate including a pixel electrode positioned opposite to the first substrate, having a centrally located, circular-shaped opening, a first ring-shaped pixel electrode around the circular-shaped opening, a ring shaped opening around the first ring-shaped pixel electrode and a second ring-shaped pixel electrode around the first ring-shaped opening to form a mirror image of the common electrode and a radial pixel connector between the first ring-shaped and second ring-shaped common electrodes;
a liquid crystal material filling the space between the first substrate and the second substrate;
the common electrode and the pixel electrodes controlled by a storage electrode;
a linear polarizer and wide band quarter-wave film forming a circular polarizer; and
at least one circular polarizer disposed on the exterior surface of the liquid crystal cell.
18. A multi-domain vertical alignment liquid crystal display of claim 17 , wherein the diameter of ring-shaped openings in the first substrate can be at least one of smaller, equal to, or larger than that of the corresponding ring-shaped indium tin oxide (ITO) on the said second substrate.
19. A multi-domain vertical alignment liquid crystal display of claim 17 , wherein the ring-shaped opening is formed by at least one of etching and photolithography on a conductive electrode surface.
20. A multi-domain vertical alignment liquid crystal display of claim 19 wherein the diameter of the ring-shaped opening is not less than approximately 2 micrometers (μm).
21. A multi-domain vertical alignment liquid crystal display of claim 17 , wherein the liquid crystal display further comprises at least one compensation film disposed between a circular polarizer and at least one of the first substrate and the second substrate.
22. A multi-domain vertical alignment liquid crystal display of claim 21 , wherein the compensation film is a combination of negative birefringence and uni-axial birefringence.
23. A multi-domain vertical alignment liquid crystal display of claim 21 , wherein the compensation film is at least one of a positive a-plate and a negative c-plate.