Liquid crystal device with controlled thicknesses ratio of inorganic layers and method of manufacturing liquid crystal device
A liquid crystal device according to embodiments of the invention includes a first alignment layer that is disposed on the first substrate and includes a second alignment layer that is disposed on the second substrate. The first alignment layer includes a first inorganic layer and a second inorganic layer which having a column-like structure with an orientation angle different from an orientation angle of the column-like structure of the first inorganic layer. The second alignment layer includes a third inorganic layer and a fourth inorganic layer which having a column-like structure with an orientation angle different from an orientation angle of the column-like structure of the third inorganic layer. The ratio of the thickness of the second inorganic layer to the thickness of the first inorganic layer is different from the ratio of the thickness of the fourth inorganic layer to the thickness of the third inorganic layer.
1. A liquid crystal device having a liquid crystal layer disposed between a first substrate and a second substrate, the liquid crystal device comprising:
a first alignment layer formed on the first substrate at a side of the liquid crystal layer, the first alignment layer including at least two inorganic layers each having a column-like structure; and
a second alignment layer formed on the second substrate at the side of the liquid crystal layer, the second alignment layer including at least two inorganic layers each having a column-like structure, wherein
the at least two inorganic layers of the first alignment layer include a first inorganic layer and a second inorganic layer, the second inorganic layer being disposed on the first inorganic layer at the side of the liquid crystal layer so as to contact the liquid crystal layer, the second inorganic layer having the column-like structure with an orientation angle different from an orientation angle of the column-like structure of the first inorganic layer,
the at least two inorganic layers of the second alignment layer include a third inorganic layer and a fourth inorganic layer, the fourth inorganic layer being disposed on the third inorganic layer at the side of the liquid crystal layer so as to contact the liquid crystal layer, the fourth inorganic layer having the column-like structure with an orientation angle different from an orientation angle of the column-like structure of the third inorganic layer, and
a first ratio of a thickness of the second inorganic layer to a thickness of the first inorganic layer is different from a second ratio of a thickness of the fourth inorganic layer to a thickness of the third inorganic layer.
2. The liquid crystal device according to claim 1 , wherein a magnitude of the first ratio of the thickness of the second inorganic layer to the thickness of the first inorganic layer is inverted with respect to a magnitude of the second ratio of the thickness of the fourth inorganic layer to the thickness of the third inorganic layer.
3. The liquid crystal device according to claim 1 , wherein
a first adsorbability of impurity ions contained in the liquid crystal layer to a side of the first substrate is different from a second adsorbability of impurity ions to a side of the second substrate, and
the first and second ratios of the inorganic layers are set such that a difference between the first adsorbability and the second adsorbability is decreased.
4. The liquid crystal device according to claim 3 , further comprising:
a reflecting electrode disposed between the first substrate and the first alignment layer; and
a transparent electrode disposed between the second substrate and the second alignment layer, wherein
the first and second ratios of the inorganic layers are set such that the difference between the first adsorbability and the second adsorbability due to a difference between a work function of the reflecting electrode and a work function of the transparent electrode is decreased.
5. The liquid crystal device according to claim 4 , further comprising passivation layers individually provided between the reflecting electrode and the first alignment layer and between the transparent electrode and the second alignment layer.
6. The liquid crystal device according to claim 1 , further comprising a seal material disposed between the first substrate and the second substrate, wherein
the first alignment layer does not overlap the seal material.
7. The liquid crystal device according to claim 1 , further comprising a seal material disposed between the first substrate and the second substrate, wherein
the second alignment layer does not overlap the seal material.
8. A liquid crystal device having a liquid crystal layer disposed between a first substrate and a second substrate, the liquid crystal device comprising:
a first alignment layer formed on the first substrate at a side of the liquid crystal layer, the first alignment layer including at least two inorganic layers each having a column-like structure; and
a second alignment layer formed on the second substrate at the side of the liquid crystal layer, the second alignment layer including at least two inorganic layers each having a column-like structure, wherein
the at least two inorganic layers of the first alignment layer include a first inorganic layer and a second inorganic layer, the second inorganic layer being disposed on the first inorganic layer at the side of the liquid crystal layer so as to contact the liquid crystal layer, the second inorganic layer having the column-like structure with an orientation angle different from an orientation angle of the column-like structure of the first inorganic layer,
the at least two inorganic layers of the second alignment layer include a third inorganic layer and a fourth inorganic layer, the fourth inorganic layer being disposed on the third inorganic layer at the side of the liquid crystal layer so as to contact the liquid crystal layer, the fourth inorganic layer having the column-like structure with an orientation angle different from an orientation angle of the column-like structure of the third inorganic layer,
a ratio of a thickness of the second inorganic layer to a thickness of the first inorganic layer is the same as a ratio of a thickness of the fourth inorganic layer to a thickness of the third inorganic layer, and
a total thickness of the first inorganic layer and the second inorganic layer is different from a total thickness of the third inorganic layer and the fourth inorganic layer.
9. The liquid crystal device according to claim 8 , further comprising a seal material disposed between the first substrate and the second substrate, wherein
the first alignment layer does not overlap the seal material.
10. The liquid crystal device according to claim 8 , further comprising a seal material disposed between the first substrate and the second substrate, wherein
the second alignment layer does not overlap the seal material.