Liquid crystal display device comprising a stage having an electrode formation surface
View Patent ↗According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first electrode, a stage including an electrode formation surface, a switching element, a second electrode and a first vertical alignment film. The second substrate includes a third electrode and a second vertical alignment film. The electrode formation surface is positioned closer to the second substrate than a portion of the first vertical alignment film, which opposes the first electrode.
1. A liquid crystal display device comprising:
a first substrate comprising a first electrode, a stage including an electrode formation surface, a switching element, a second electrode provided on the electrode formation surface and electrically connected to the switching element, and a first vertical alignment film covering the first electrode and the second electrode;
a second substrate which comprises a third electrode opposing the first electrode and the second electrode, and a second vertical alignment film covering the third electrode, and is arranged opposite to the first substrate with a gap therebetween; and
a liquid crystal layer held between the first substrate and the second substrate,
wherein the electrode formation surface is positioned closer to the second substrate than a portion of the first vertical alignment film, which opposes the first electrode,
wherein a height of the stage is set such that the second electrode is positioned in a center of the liquid crystal layer in a thickness direction.
2. The device according to claim 1 , further comprising:
a controller configured to set potentials of the first electrode, the second electrode, and the third electrode.
3. The device according to claim 1 , wherein the first electrode, the second electrode, and the third electrode are made of a transparent conductive material.
4. The device according to claim 1 , wherein
the first electrode and the third electrode are solid electrodes and set at the same potential,
the second electrode is formed into an island, and
the liquid crystal layer is made of a positive-type liquid crystal material.
5. The device according to claim 1 , wherein
the first electrode and the third electrode are solid electrodes and set at the same potential,
the second electrode is formed into an island,
the stage is made of a transparent insulating material, and
the liquid crystal layer is made of a negative-type liquid crystal material.
6. The device according to claim 1 , wherein
the first substrate further comprises another switching element electrically connected to the first electrode,
the first electrode and the second electrode are formed into islands,
the third electrode is a solid electrode,
the first electrode, the second electrode, and the third electrode are set at potentials independent of each other,
the stage is made of a transparent insulating material, and
the liquid crystal layer is made of a negative-type liquid crystal material.
7. The device according to claim 1 , wherein
the first substrate further comprises another switching element electrically connected to the first electrode,
the first electrode and the second electrode are formed into islands,
a position of the second electrode is determined in accordance with a height of the stage,
the third electrode is a solid electrode, and
the first electrode, the second electrode, and the third electrode are set at potentials independent of each other in accordance with the position of the second electrode.
8. The device according to claim 7 , wherein the first electrode, the second electrode, and the third electrode are set at potentials at which an alignment of liquid crystal molecules on a side of the first substrate and an alignment of liquid crystal molecules on a side of the second substrate are symmetrical with respect to the center of the liquid crystal layer in the thickness direction.
9. A liquid crystal display device comprising:
a first substrate comprising a first stage including a first electrode formation surface, a first electrode provided on the first electrode formation surface, a second stage including a second electrode formation surface, a switching element, a second electrode provided on the second electrode formation surface, electrically connected to the switching element, and set at a potential independent of the first electrode, and a first horizontal alignment film covering the first electrode and the second electrode;
a second substrate which comprises a second horizontal alignment film, and is arranged opposite to the first substrate with a gap therebetween; and
a liquid crystal layer held between the first substrate and the second substrate,
wherein the first electrode formation surface and the second electrode formation surface are positioned closer to the second substrate than a portion of the first horizontal alignment film, which does not oppose the first stage, the first electrode, the second stage, and the second electrode,
wherein heights of the first stage and the second stage are set such that the first electrode and the second electrode are positioned in a center of the liquid crystal layer in a thickness direction.
10. The device according to claim 9 , further comprising:
a controller configured to independently set potentials of the first electrode and the second electrode.
11. The device according to claim 9 , wherein
an alignment direction of the first horizontal alignment film and the second horizontal alignment film is a direction perpendicular to a direction in which the first electrode and the second electrode oppose each other, and
the liquid crystal layer is made of a positive-type liquid crystal material.