Liquid crystal display device
A liquid crystal display device comprising a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode having a slit and formed on the interlayer insulating film, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole. A taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees. The pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. This configuration facilitates the alignment film material to flow into the through-hole, thereby solving a thickness unevenness of the alignment film in vicinity of the through-hole.
1. A liquid crystal display device comprising:
a transistor substrate including;
a thin film transistor having a source electrode,
a gate signal line driving the thin film transistor,
an organic insulating film formed on the thin film transistor and having a through hole,
a common electrode formed on the organic insulating film,
an interlayer insulating film formed on the common electrode,
a pixel electrode formed on the interlayer insulating film and electrically connected to the source electrode via the through hole,
a counter substrate; and
a liquid crystal layer sandwiched between the transistor substrate and the counter substrate,
wherein the common electrode has a hole corresponding to the through hole,
the pixel electrode has a non-formation part, and
a part of the non-formation part overlaps with the hole in a plan view.
2. The liquid crystal display device according to claim 1 ,
wherein the non-formation part is a slit.
3. The liquid crystal display device according to claim 2 ,
wherein the through hole has a side wall, and
the through hole overlaps with the part of the non-formation part.
4. The liquid crystal display device according to claim 1 , further comprising a photo-alignment film aligning the liquid crystal layer,
wherein the photo-alignment film is inside the through hole.
5. The liquid crystal display device according to claim 1 ,
wherein the hole is greater than the through hole in a plan view.
6. The liquid crystal display device according to claim 1 ,
wherein a part of the interlayer insulating film is in contact with the source electrode.
7. The liquid crystal display device according to claim 1 ,
wherein the through hole has a cross-section in which a top face is defined on the side of the counter substrate and a bottom face is defined on the side of the source electrode,
in a cross-sectional view, the top face is greater than a width of the source electrode.
8. The liquid crystal display device according to claim 7 ,
wherein the counter substrate has a light shielding film corresponding to the through hole, and
a width of the light shielding film is greater than the width of the source electrode.
9. The liquid crystal display device according to claim 1 ,
wherein the organic insulating film is in contact with the interlayer insulating film at the hole.
10. A liquid crystal display device comprising:
a transistor substrate,
a source electrode of a thin film transistor provided on the transistor substrate,
an organic insulating film covering the source electrode and having a through hole,
a common electrode provided on the organic insulating film,
an interlayer insulating film provided on the common electrode,
a pixel electrode provided on the interlayer insulating film and electrically connected to the source electrode via the through hole, and
a counter substrate,
wherein the common electrode has a hole corresponding to the through hole,
the pixel electrode has a slit,
a part of the slit overlaps with the hole in a plan view.
11. The liquid crystal display device according to claim 10 , further comprising an alignment film provided on the pixel electrode, and
a liquid crystal layer provided between the alignment film and the counter substrate,
wherein the alignment film is a photo-alignment film, and aligning the liquid crystal layer.
12. The liquid crystal display device according to claim 11 ,
wherein the photo-alignment film is inside the through hole.
13. The liquid crystal display device according to claim 10 ,
wherein the through hole has a side wall, and
the through hole overlaps with a part of the slit.
14. The liquid crystal display device according to claim 10 ,
wherein a part of the interlayer insulating film is in contact with the source electrode.
15. The liquid crystal display device according to claim 10 ,
wherein the organic insulating film is in contact with the interlayer insulating film at the hole.