Barriers for reflective pixel electrodes of display devices and methods
View Patent ↗In one or more embodiments, barriers for reflective pixels electrodes of display devices and methods are disclosed. In one such embodiment, a reflective spatial light modulator for a display device has a plurality of reflective pixel electrodes. Each reflective pixel electrode may include a conductor, a tantalum containing barrier over the conductor, and a conductive reflector over the conductive barrier.
1. A reflective spatial light modulator for a display device, comprising:
a plurality of reflective pixel electrodes, wherein each reflective pixel electrode comprises:
a conductor;
a tantalum containing barrier over the conductor; and
a conductive reflector over the tantalum containing barrier,
wherein the conductor comprises a conductive material selected from the group consisting of titanium, titanium nitride and tungsten.
2. The reflective spatial light modulator of claim 1 , wherein the tantalum containing barrier comprises a material selected from the group consisting of tantalum nitride and tantalum.
3. A reflective spatial light modulator for a display device, comprising:
a plurality of reflective pixel electrodes, wherein each reflective pixel electrode comprises:
a conductor;
a tantalum containing barrier over the conductor; and
a conductive reflector over the tantalum containing barrier,
wherein the conductor comprises a conductive material selected from the group consisting of titanium, titanium nitride, and tungsten, the conductive reflector comprises a conductive material selected from the group consisting of silver, gold, cobalt, and nickel, and the tantalum containing barrier comprises tantalum nitride.
4. The reflective spatial light modulator of claim 1 , wherein the tantalum containing barrier has a thickness in the range from 30 angstroms to 500 angstroms.
5. The reflective spatial light modulator of claim 4 , wherein tantalum containing barrier has a thickness in the range from 75 angstroms to 250 angstroms.
6. The reflective spatial light modulator of claim 1 , wherein the conductive reflector has a thickness in the range from 250 angstroms to 1000 angstroms.
7. The reflective spatial light modulator of claim 1 , further comprising liquid crystal material over the plurality of reflective pixel electrodes.
8. The reflective spatial light modulator of claim 7 , further comprising a transparent conductor over the liquid crystal material.
9. The reflective spatial light modulator of claim 1 , wherein adjacent pixel electrodes are separated from each other by openings.
10. The reflective spatial light modulator of claim 9 , wherein each opening contains a dielectric plug.
11. A reflective pixel array for a display device, comprising:
a plurality of reflective pixel electrodes, wherein each reflective pixel electrode comprises:
a tantalum nitride barrier between a silver reflector and a conductor selected from the group consisting of titanium, titanium nitride, and tungsten, wherein an upper surface of the silver reflector forms an upper reflective surface of the reflective pixel electrode configured to receive and reflect incident light.
12. A liquid crystal display device, comprising:
a plurality of conductor stacks, each conductor stack coupled to a first conductor by a conductive via plug, each conductor stack corresponding to a reflective pixel of the liquid crystal display device;
liquid crystal material over the plurality of conductor stacks; and
a transparent second conductor over the liquid crystal material;
wherein each conductor stack comprises:
a third conductor over the conductive via plug so that the conductive via plug is between the first conductor and the third conductor;
a tantalum containing barrier over the third conductor; and
a conductive reflector over the tantalum containing barrier,
wherein the third conductor is comprises a conductive material selected from the group consisting of titanium, titanium nitride, and tungsten,
wherein the conductive reflector comprises a conductive material selected from the group consisting of silver, gold, cobalt, and nickel, and the tantalum containing barrier comprises tantalum nitride.
13. A liquid crystal display device, comprising:
a plurality of conductor stacks, each conductor stack coupled to a first conductor by a conductive via plug, each conductor stack corresponding to a reflective pixel of the liquid crystal display device;
liquid crystal material over the plurality of conductor stacks; and
a transparent second conductor over the liquid crystal material,
wherein each conductor stack comprises:
a third conductor over the conductive via plug so that the conductive via plug is between the first conductor and the third conductor;
a tantalum containing barrier over the third conductor; and
a conductive reflector over the tantalum containing barrier, and a fourth conductor between the third conductor and the conductive via plug.
14. A liquid crystal display device, comprising:
a plurality of conductor stacks, each conductor stack coupled to a first conductor by a conductive via plug, each conductor stack corresponding to a reflective pixel of the liquid crystal display device;
liquid crystal material over the plurality of conductor stacks; and
a transparent second conductor over the liquid crystal material,
wherein each conductor stack comprises:
a third conductor over the conductive via plug so that the conductive via plug is between the first conductor and the third conductor;
a tantalum containing barrier over the third conductor; and
a conductive reflector over the tantalum containing barrier, and
wherein the conductive via plug comprises:
a conductive liner; and
a fourth conductor over the conductive liner.
15. The liquid crystal display device of claim 14 , wherein the conductive liner comprises adhesion material at least over the first conductor and barrier material between at least the adhesion material and the fourth conductor.
16. The liquid crystal display device of claim 12 , wherein the liquid crystal material is selected from the group consisting of ferroelectric liquid crystal material and nematic liquid crystal material.
17. The liquid crystal display device of claim 12 , wherein the transparent second conductor comprises indium tin oxide.
18. The liquid crystal display device of claim 12 , wherein adjacent conductor stacks are separated from each other by openings, wherein each opening contains a dielectric plug recessed below upper surfaces of the conductor stacks.
19. The liquid crystal display device of claim 12 , further comprising alignment material between the liquid crystal material and the transparent second conductor and/or between the liquid crystal material and the plurality of conductor stacks.
20. The liquid crystal display device of claim 12 , wherein first conductor is selectively coupled to one or more voltage sources and the transparent second conductor is coupled to a voltage source different than the one or more voltage sources to which the first conductor is selectively coupled.