Liquid crystal display device

1. A liquid crystal display device comprising:

a first substrate;

a second substrate;

a first electrode provided on a first surface of the first substrate, the first surface facing the second substrate, the first electrode including a plurality of convex and concave portions;

a first oriented film provided on the first surface of the first substrate;

a second electrode provided on a second surface of the second substrate, the second surface facing the first substrate; and

a liquid crystal layer provided between the first substrate and the second substrate,

wherein at least one of the convex portions includes a plurality of stepped portions,

wherein the plurality of convex and concave portions includes convex stem portions that pass a pixel center portion and extend in a cross shape and a plurality of branched convex portions that extend from the convex stem portions toward a pixel circumferential portion, and

wherein the plurality of stepped portions are provided at the convex stem portions, each of the plurality of stepped portions comprising a first surface positioned at a center portion of one of the convex stem portions, a second surface positioned on both sides of the first surface, and a third surface positioned outside the second surface, and wherein a height of the first surface is greater than a height of the second surface, and a height of the second surface is greater than a height of the third surface.

2. The liquid crystal display device according to claim 1 , wherein the plurality of stepped portions are provided at the branched convex portions, each of the plurality of stepped portions comprising a first surface extending from one of the convex stem portions and a second surface positioned on both sides of the first surface, and wherein a height of the first surface is greater than a height of the second surface.

3. The liquid crystal display device according to claim 2 , wherein each of the plurality of stepped portions declines from a side of one of the convex stem portions toward an end portion of one of the branched convex portions.

4. The liquid crystal display device according to claim 1 , wherein the convex and concave portions comprise a convex stem portion formed in a frame shape at a pixel circumferential portion and a plurality of branched convex portions that extend from the convex stem portion toward the inside of a pixel.

5. The liquid crystal display device according to claim 4 , wherein the convex stem portion comprises a first surface located at an outer edge of the convex stem portion, a third surface located at an inner edge of the convex stem portion, and a second surface located between the first and third surfaces, and wherein a height of the first surface is greater than a height of the second surface, and a height of the second surface is greater than a height of the third surface.

6. The liquid crystal display device according to claim 4 , wherein each of the branched convex portions comprises a first surface that extends from a surface of the convex stem portion, and a second surface positioned on both sides of the first surface, and wherein a height of the first surface is greater than a height of the second surface.

7. A liquid crystal display device comprising:

a first substrate;

a second substrate;

a first electrode provided on a first surface of the first substrate, the first surface facing the second substrate, the first electrode including a plurality of convex and concave portions;

a first oriented film provided on the first surface of the first substrate;

a second electrode provided on a second surface of the second substrate, the second surface facing the first substrate; and

a liquid crystal layer provided between the first substrate and the second substrate,

wherein a convex structure is provided from a part of the first substrate positioned between pixels to a part of the first substrate corresponding to a pixel circumferential portion,

wherein a circumferential portion of the concave and convex portions is provided on the convex structure,

wherein the convex structure comprises a black matrix formed on a color filter layer, and

wherein the plurality of convex and concave portions includes convex stem portions that pass a pixel center portion and extend in a cross shape, wherein a plurality of stepped portions are provided at the convex stem portions, each of the plurality of stepped portions comprising a first surface positioned at a center portion of one of the convex stem portions and a second surface positioned on both sides of the first surface, and wherein a height of the first surface is greater than a height of the second surface.

8. A liquid crystal display device comprising:

a first substrate;

a second substrate;

a first electrode provided on a first surface of the first substrate, the first surface facing the second substrate, the first electrode including a plurality of convex and concave portions;

a first oriented film provided on the first surface of the first substrate;

a second electrode provided on a second surface of the second substrate, the second surface facing the first substrate; and

a liquid crystal layer provided between the first substrate and the second substrate,

wherein the convex and concave portions comprise a convex stem portion formed in a frame shape at a pixel circumferential portion and a plurality of branched convex portions that extend from the convex stem portion toward the inside of a pixel, and

wherein the convex stem portion comprises a first surface located at an outer edge of the convex stem portion, a third surface located at an inner edge of the convex stem portion, and a second surface located between the first and third surfaces, and wherein a height of the first surface is greater than a height of the second surface, and a height of the second surface is greater than a height of the third surface.

9. The liquid crystal display device according to claim 8 , wherein an orientation regulating portion is provided at a part of the second electrode corresponding to the convex stem portions, and wherein the orientation regulating portion comprises a slit provided at the second electrode.

10. The liquid crystal display device according to claim 8 , wherein an orientation regulating portion is provided at a part of the second electrode corresponding to the convex stem portions, and wherein the orientation regulating portion comprises a protrusion provided at the second electrode.

11. A liquid crystal display device comprising:

a first substrate;

a second substrate;

a first electrode provided on a first surface of the first substrate, the first surface facing the second substrate, the first electrode including a plurality of convex and concave portions;

a first oriented film provided on the first surface of the first substrate;

a second electrode provided on a second surface of the second substrate, the second surface facing the first substrate; and

a liquid crystal layer provided between the first substrate and the second substrate,

wherein the convex and concave portions include a convex stem portion that is provided in a frame shape at a pixel circumferential portion and a plurality of branched convex portions that extend from the convex stem portion toward the inside of a pixel, and

wherein each of the branched convex portions comprises a first surface that extends from a surface of the convex stem portion, and a second surface positioned on both sides of the first surface, and wherein a height of the first surface is greater than a height of the second surface.

12. The liquid crystal display device according to claim 11 , wherein at least one of a slit portion and a protruding portion is provided on the first electrode, and wherein the slit portion is formed on the first electrode, passes through a pixel center portion and is in parallel with the pixel circumferential portion.

13. The liquid crystal display device according to claim 11 , wherein at least one of a slit portion and a protruding portion is provided on the first electrode, and wherein the protruding portion is formed on the first electrode, passes through a pixel center portion and is in parallel with the pixel circumferential portion.

14. A method of manufacturing a liquid crystal display device comprising:

forming a first oriented film on a first electrode, the first electrode formed on a first surface of a first substrate, the first electrode including a plurality of convex and concave portions;

forming a second oriented film on a second electrode, the second electrode formed on a second surface of a second substrate, the second oriented film facing the first oriented film;

sealing a liquid crystal layer between the first and second oriented films;

applying a voltage between the first and second electrodes; and

irradiating the first and second oriented films with an ultraviolet ray while applying the voltage,

wherein the plurality of convex and concave portions includes convex stem portions that pass a pixel center portion and extend in a cross shape and a plurality of branched convex portions that extend from the convex stem portions toward a pixel circumferential portion, and

wherein the plurality of stepped portions are provided at the convex stem portions, each of the plurality of stepped portions comprising a first surface positioned at a center portion of one of the convex stem portions, a second surface positioned on both sides of the first surface, and a third surface positioned outside the second surface, and wherein a height of the first surface is greater than a height of the second surface, and a height of the second surface is greater than a height of the third surface.

15. The method according to claim 14 , comprising performing a heat treatment on each of the first and second oriented films.