DISPLAY DEVICE
A display device includes a plurality of pixels arranged in a matrix on a substrate along a first direction and a second direction intersecting the first direction, each of the plurality of pixels including a transistor, a first wiring arranged over the transistor and electrically connected to the transistor, a first transparent conductive layer arranged over the first wiring and electrically connected to the transistor, a first insulating layer arranged on the first transparent conductive layer, and having a contact hole, and a second transparent conductive layer arranged on the first insulating layer and electrically connected to the first transparent conductive layer via the contact hole.
1 . A display device comprising a plurality of pixels arranged in a matrix on a substrate along a first direction and a second direction intersecting the first direction,
each of the plurality of pixels comprises:
a transistor;
a first wiring arranged over the transistor and electrically connected to the transistor;
a first transparent conductive layer arranged over the first wiring and electrically connected to the transistor;
a first insulating layer arranged on the first transparent conductive layer, and having a contact hole; and
a second transparent conductive layer arranged on the first insulating layer and electrically connected to the first transparent conductive layer via the contact hole,
wherein the first insulating layer has a recess portion overlapping the first transparent conductive layer,
the recess portion is continuous with the contact hole, and
the contact hole is arranged at a bottom part of the recess portion.
2 . The display device according to claim 1 , wherein an interval between the first wirings of two pixels adjacent to each other in the second direction is 4 μm or more and 8 μm or less, and a contact area between the first transparent conductive layer and the second transparent conductive layer is 40% or more of the interval between the first wirings.
3 . The display device according to claim 1 , wherein a thickness of the first insulating layer in the recess portion is 70% or more and 75% or less with respect to the thickness of the first insulating layer without the recess portion.
4 . The display device according to claim 1 , further comprising:
a common auxiliary electrode arranged over the second transparent conductive layer; and
a third transparent conductive layer arranged over the common auxiliary electrode,
wherein the recess portion overlaps the common auxiliary electrode.
5 . The display device according to claim 4 , further comprising:
a filling member filled in the contact hole,
wherein the filling member has a projecting portion protruding above a top surface of the third transparent conductive layer.
6 . A display device comprising a plurality of pixels arranged in a matrix on a substrate along a first direction and a second direction intersecting the first direction,
each of the plurality of pixels comprises:
a transistor;
a first wiring arranged over the transistor and electrically connected to the transistor;
a first transparent conductive layer arranged over the first wiring and electrically connected to the transistor;
a first insulating layer arranged on the first transparent conductive layer, and having a contact hole; and
a second transparent conductive layer arranged on the first insulating layer and electrically connected to the first transparent conductive layer via the contact hole,
wherein the first insulating layer has a recess portion extending over a plurality of pixels arranged side-by-side in the second direction,
the recess portion is arranged continuously with the contact hole, and
the contact hole is arranged at a bottom part of the recess portion overlapping the first transparent conductive layer.
7 . The display device according to claim 6 , wherein an interval of the first wirings of two pixels adjacent to each other in the second direction is 4 μm or more and 8 μm or less, and a contact area between the first transparent conductive layer and the second transparent conductive layer is 40% or more of the interval between the first wirings.
8 . The display device according to claim 6 , wherein a thickness of the first insulating layer in the recess portion is 70% or more and 75% or less of the thickness of the first insulating layer without the recess portion.
9 . The display device according to claim 6 , further comprising:
a common auxiliary electrode arranged over the second transparent conductive layer; and
a third transparent conductive layer arranged over the common auxiliary electrode,
wherein the recess portion overlaps the common auxiliary electrode.
10 . The display device according to claim 9 , further comprising a filling member filled in the contact hole,
wherein the filling member has a projecting portion protruding above a top surface of the third transparent conductive layer.
11 . A display device comprising:
a substrate;
a pixel arranged on the substrate, and having a transistor, a pixel electrode, and a common electrode;
a wiring connected to a first electrode of the transistor;
a conductive layer connected to a second electrode of the transistor;
an insulating layer arranged over the conductive layer, and having a contact hole;
wherein the pixel electrode is connected to the conductive layer via the contact hole,
the contact hole includes a first region having a first side surface and a second region having a second side surface and located between the first region and the conductive layer,
a bottom part of the first region is continuous with a top of the second region,
a tangent line of the first side surface at a bottom of the first region makes a first angle with a main surface of the substrate,
a tangent line of the second side surface at a bottom of the second region makes a second angle with the main surface of the substrate,
the first angle is less than the second angle, and
a portion of the insulating layer is located between the wiring and the common electrode.
12 . The display device according to claim 11 , wherein
the wiring does not overlap the contact hole in a plan view.
13 . The display device according to claim 11 , wherein
the wiring overlaps the common electrode in a plan view.
14 . The display device according to claim 11 , wherein
the pixel electrode is in contact with the entire second region.
15 . The display device according to claim 14 , wherein
the pixel electrode is in contact with a first portion of the first region and not in contact with a second portion of the first region.
16 . The display device according to claim 11 , wherein
a gate electrode of the transistor overlaps the contact hole.
17 . The display device according to claim 11 , further comprising:
a light-shielding layer located between the substrate and the transistor,
wherein the light-shielding layer overlaps the contact hole in a plan view.
18 . The display device according to claim 17 , wherein
the light-shielding layer does not overlap a region where the second electrode and the conductive layer are connected in a plan view.