Liquid crystal display device having alignment films
A liquid crystal display device includes a first substrate, a first alignment film formed over the first substrate, a second substrate, a second alignment film formed over the second substrate, a liquid crystal layer sandwiched between the first alignment film and the second alignment film, and a projecting portion formed over the second substrate. The first film is a photo alignment film, and a thickness “d2” of the second alignment film over the projecting portion and a film thickness “d1” of a portion of the first alignment film facing the projecting portion satisfy formula (2), d2<d1 (2).
1. A liquid crystal display device comprising:
a first substrate;
a thin film transistor including a gate electrode provided on the first substrate;
a first insulation film provided on the thin film transistor;
a first alignment film provided on the first insulation film;
a first electrode and a second electrode provided between the first substrate and the first alignment film in a pixel region;
a second substrate;
a black matrix provided on the second substrate;
a projection provided on the black matrix;
a second alignment film provided on the black matrix and the projection; and
a liquid crystal layer provided between the first substrate and the second substrate,
wherein one of the first electrode and the second electrode is between the first insulation film and the first alignment film,
wherein one of a color filter and an overcoat is between the black matrix and the projection,
wherein a total thickness “b” of the first alignment film and the second alignment film between the projection and the first insulation film satisfies formula (1),
wherein a thickness of the first alignment film other than between the projection and the first insulation film is more than four times thicker than the total thickness “b”, and
wherein a thickness of the second alignment film other than between the projection and the first insulation film is more than four times thicker than the total thickness “b”,
0 nm<b<30 nm (1).
2. The liquid crystal display device according to claim 1 ,
wherein the liquid crystal layer is controlled by an electric field generated between the first electrode and the second electrode.
3. The liquid crystal display device according to claim 1 ,
wherein the first alignment film and the second alignment film are a photo alignment film.
4. The liquid crystal display device according to claim 1 ,
wherein the projection overlaps with the thin film transistor, in a plan view.
5. The liquid crystal display device according to claim 1 ,
wherein the first alignment film or the second alignment film includes a coupling agent.
6. The liquid crystal display device according to claim 1 ,
wherein the first alignment film is formed from a material having a skeleton of cyclobutene tetracarboxylic acid.
7. The liquid crystal display device according to claim 1 ,
wherein the first alignment film is made from a material having a skeleton of diamine phenyl ether.
8. The liquid crystal display device according to claim 1 ,
wherein a top surface of the projection is flat.
9. The liquid crystal display device according to claim 1 ,
wherein the second alignment film is not provided on a top surface of the projection.
10. The liquid crystal display device according to claim 1 , wherein the other of the first electrode and the second electrode is between the first insulation film and the first substrate.