Liquid crystal display element and multi-layer liquid crystal display element including the element
The invention relates to a liquid crystal display element having a liquid crystal enclosed between a pair of substrates and a multi-layer liquid crystal display element utilizing such elements. A liquid crystal display element having improved strength at enclosing portions thereof is provided without any reduction in the throughput of manufacturing steps along with a multi-layer liquid crystal display element utilizing such elements. A liquid crystal display element for blue includes a first substrate having a first through hole formed to extend from one surface to another, a second substrate disposed opposite to the first substrate and having a second through hole formed opposite to the first through hole to extend from one surface to another, the second through hole having an area greater than that of the first through hole, a liquid crystal layer for blue sandwiched between the first and second substrates, and an enclosing material sealing the first and second through holes such that the liquid crystal for blue forming the liquid crystal layer for blue does not leak through the first and second through holes.
1. A multi-layer liquid crystal display element comprising a plurality of liquid crystal display elements stacked one over another, wherein each of the liquid crystal display elements includes:
a first substrate having a first through hole formed to extend from one surface to another;
a second substrate disposed opposite to the first substrate and having a second through hole formed opposite to the first through hole to extend from one surface to another, the second through hold having an area greater than that of the first through hole;
a first electrode formed on either one of the first substrate or the second substrate;
a second electrode formed on other of the first substrate or the second substrate;
a seal material provided in the form of a frame extending along the peripheries of the first and second substrates to secure the first and second substrates with each other;
a liquid crystal sandwiched between the first and second substrates; and
an enclosing material sealing the first and second through holes such that the liquid crystal does not leak through the first and second through holes,
wherein the liquid crystal display elements disposed on two sides of the stack are disposed such that the first through holes thereof open to the exterior of the stack, and
wherein either one of the liquid crystal display elements disposed on two sides of the stack has the first electrode formed on the first substrate and the second electrode formed on the second substrate, and other of the liquid crystal display elements disposed on two sides of the stack has the second electrode formed on the first substrate and the first electrode formed on the second substrate.
2. The multi-layer liquid crystal display element according to claim 1 , wherein the first and second through holes formed in each of the plurality of liquid crystal display elements stacked one over another are disposed in such positions that they overlap each other when viewed in the normal direction of the substrate surfaces of the first and second substrates.
3. The multi-layer liquid crystal display element according to claim 1 , wherein the first and second through holes formed in each of the plurality of liquid crystal display elements stacked one over another are disposed in such positions that they do not overlap each other when viewed in the normal direction of the substrate surfaces of the first and second substrates.
4. The multi-layer liquid crystal display element according to claim 1 , wherein:
the liquid crystal is a cholesteric liquid crystal selectively reflecting light having a wavelength in a visible band; and
the plurality of liquid crystal display elements selectively reflect light having wavelengths different from each other.
5. The multi-layer liquid crystal display element according to claim 1 , wherein an enclosing region on the first substrate provided by the enclosing material has an area greater than the area of an enclosing region on the second substrate.
6. The multi-layer liquid crystal display element according to claim 1 , wherein the enclosing material flows into the gap between the first and second substrates to fill the first and second through holes.
7. The multi-layer liquid crystal display element according to claim 1 , wherein the center axis of the first through hole is substantially aligned with the center axis of the second through hole.
8. The multi-layer liquid crystal display element according to claim 1 , wherein the first and second through holes have a curved aperture shape when viewed in the normal direction of substrate surfaces of the first and second substrates.
9. The multi-layer liquid crystal display element according to claim 1 , wherein the first and second through holes are disposed in the neighborhood of peripheries of the first and second substrates.
10. The multi-layer liquid crystal display element according to claim 1 , wherein the liquid crystal is a cholesteric liquid crystal selectively reflecting light having a wavelength in a visible band.