Liquid crystal display device
View Patent ↗To prevent a phenomenon that an alignment film material is difficult to flow into the through-hole where a diameter of a through-hole for connecting between a pixel electrode and a source electrode is reduced. 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 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 formed on the interlayer insulating film, the pixel electrode having a slit,
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 counter substrate having a black matrix formed thereon; and
liquid crystal sandwiched between the TFT substrate and the counter substrate,
wherein, where the through-hole formed in the organic passivation film assumes 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, and
wherein 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.
2. A liquid crystal display device according to claim 1 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
3. A liquid crystal display device comprising:
a TFT substrate having pixels each including
a pixel electrode formed on an organic passivation film,
a through-hole formed in the organic passivation film,
a source electrode electrically conducted to the pixel electrode via the through-hole,
an interlayer insulating film formed so as to cover the pixel electrode, and
a common electrode formed on the interlayer insulating film, the common electrode having a slit;
a counter substrate having a black matrix formed thereon; and
liquid crystal sandwiched between the TFT substrate and the counter substrate,
wherein, where the through-hole formed in the organic passivation film assumes 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, and
wherein the common 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.
4. A liquid crystal display device according to claim 3 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
5. 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 formed on the interlayer insulating film, the pixel electrode having a slit,
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 counter substrate having a black matrix formed thereon; and
liquid crystal sandwiched between the TFT substrate and the counter substrate,
wherein, where the through-hole formed in the organic passivation film assumes 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, and
the slit of the pixel electrode extends to a depth of 1 μm or more from a top surface of the organic passivation film or to a depth of D/4 or more from the top surface of the organic passivation film.
6. A liquid crystal display device according to claim 5 , wherein the slit extends to the bottom face of the through-hole.
7. A liquid crystal display device according to claim 6 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
8. A liquid crystal display device according to claim 5 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
9. A liquid crystal display device comprising:
a TFT substrate having pixels each including
a pixel electrode formed on an organic passivation film,
a through-hole formed in the organic passivation film,
a source electrode electrically conducted to the pixel electrode via the through-hole,
an interlayer insulating film formed so as to cover the pixel electrode, and
a common electrode formed on the interlayer insulating film, the common electrode having a slit;
a counter substrate having a black matrix formed thereon; and
liquid crystal sandwiched between the TFT substrate and the counter substrate,
wherein, where the through-hole formed in the organic passivation film assumes 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, and
the slit of the pixel electrode extends to a depth of 1 μm or more from a top surface of the organic passivation film or to a depth of D/4 or more from the top surface of the organic passivation film.
10. A liquid crystal display device according to claim 9 , wherein the slit extends to the bottom face of the through-hole.
11. A liquid crystal display device according to claim 10 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.
12. A liquid crystal display device according to claim 9 , wherein the taper angle of the through-hole is equal to or more than 60 degrees.