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,
an organic insulating film formed on the thin film transistor and having a through hole which has a side wall,
a common electrode formed on the organic insulating film,
an interlayer insulating film formed on the common electrode, and
a pixel electrode formed on the interlayer insulating film and electrically connected to the source electrode via the through-hole,
a counter substrate having a light shielding film, and
a liquid crystal layer sandwiched between the transistor substrate and the counter substrate,
wherein the pixel electrode covers the side wall of the through-hole, and
wherein the pixel electrode has a slit including a first end, and the first end is overlapped with the side wall.
2. The liquid crystal display device according to claim 1 , wherein the pixel electrode has a slit.
3. The liquid crystal display device according to claim 2 , wherein the slit overlaps with a part of the side wall.
4. The liquid crystal display device according to claim 1 , wherein the through-hole formed in the organic insulating film, 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, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D,
a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees.
5. The liquid crystal display device according to claim 4 , wherein
the slit of the pixel electrode extends to a depth of 1 μm or more from a top surface of the organic insulating film or to a depth of D/4 or more from the top surface of the organic insulating film.
6. The liquid crystal display device according to claim 1 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
7. The liquid crystal display device according to claim 1 , wherein an alignment film is formed in the through-hole.
8. The liquid crystal display device according to claim 1 , wherein the interlayer insulating film is formed by silicon nitride.
9. A liquid crystal display device comprising:
a transistor substrate including;
a gate line,
a thin film transistor, having a source electrode, connected to the gate line,
an organic insulating film formed on the thin film transistor and having a through hole which has a side wall,
a common electrode formed on the organic insulating film,
an interlayer insulating film formed on the common electrode, and
a pixel electrode formed on the interlayer insulating film and electrically connected to the source electrode via the through-hole,
a counter substrate having a light shielding film, and
a liquid crystal layer sandwiched between the transistor substrate and the counter substrate,
wherein the pixel electrode covers the side wall of the through-hole, and
wherein the pixel electrode has a first end disposed between an edge of the through hole and the gate line, in a plan view, and the first end is overlapped with the side wall.
10. The liquid crystal display device according to claim 9 , further comprising an alignment film contacts with the pixel electrode,
wherein the common electrode has a slit.
11. The liquid crystal display device according to claim 9 , wherein the slit overlaps with a part of the side wall.
12. The liquid crystal display device according to claim 9 , wherein the through-hole formed in the organic insulating film, 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, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D,
a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees.
13. The liquid crystal display device according to claim 12 ,
the slit of the common electrode extends to a depth of 1 μm or more from a top surface of the organic insulating film or to a depth of D/4 or more from the top surface of the organic insulating film.
14. The liquid crystal display device according to claim 9 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
15. The liquid crystal display device according to claim 9 , wherein an alignment film is formed in the through-hole.
16. The liquid crystal display device according to claim 9 , wherein the interlayer insulating film is formed by silicon nitride.