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, the organic insulating film having a through-hole,
a pixel electrode formed on the organic insulating film and connected to the source electrode through the through-hole,
an interlayer insulating film formed on the pixel electrode, and
a common electrode formed on the interlayer insulating film;
a counter substrate having a black matrix formed thereon; and
liquid crystal sandwiched between the transistor substrate and the counter substrate; wherein
the common electrode covers a bottom face of the through-hole, and has a slit, an end of which is located at a sidewall of the through hole.
2. The liquid crystal display device according to claim 1 , wherein
the end of the slit overlaps the black matrix in a plan view.
3. The liquid crystal display device according to claim 1 , further comprising a scanning line, which drives the thin film transistor, and
a video signal line electrically connected to the source electrode,
wherein the scanning line extends in a first direction, and
the video signal line extends in a second direction crossing the first direction.
4. The liquid crystal display device according to claim 3 , wherein
a bottom face of the through hole is between the gate line and the slit of the common electrode in a plan view.
5. The liquid crystal display device according to claim 1 , wherein
the transistor substrate further includes an alignment layer, and
a part of the through-hole is covered with the alignment layer via the pixel electrode and the common electrode overlapped with the pixel electrode, and a remaining part of the through-hole is covered with the alignment layer via the pixel electrode.
6. The liquid crystal display device according to claim 5 , wherein
the alignment layer consists of a photo-alignment film.
7. The liquid crystal display device according to claim 1 , wherein
the side wall of the through-hole is covered with the interlayer insulating film.
8. The liquid crystal display device according to claim 7 , wherein
the interlayer insulating film is sandwiched with the pixel electrode and the common electrode at the bottom face of the through-hole.
9. The liquid crystal display device according to claim 1 , wherein
a part of an outer edge of the pixel electrode does not overlap the common electrode.
10. The liquid crystal display device according to claim 1 , wherein
the bottom face of the through-hole is located between the end of the slit and a part of an outer edge of the pixel electrode in a plan view.