Circuit board

1 . A circuit board comprising:

a first insulating layer;

a first circuit pattern layer disposed on the first insulating layer; and

a second insulating layer disposed on the first insulating layer and the first circuit pattern layer,

wherein the first insulating layer includes a first opening passing through at least a part of the first insulating layer from an upper surface of the first insulating layer toward a lower surface of the first insulating layer,

wherein the first circuit pattern layer includes a first electrode having a second opening overlapping the first opening in a vertical direction,

wherein the second opening passes through upper and lower surfaces of the first electrode,

wherein the second insulating layer is provided to fill the first opening of the first insulating layer and the second opening of the first electrode, and

wherein a width of the first opening in a region closest to the second opening is the same as a width of the second opening in a region closest to the first opening.

2 . The circuit board of claim 1 , wherein the first opening passes through the upper and lower surfaces of the first insulating layer.

3 . The circuit board of claim 2 , wherein the first opening includes:

a first sidewall adjacent to the upper surface of the first insulating layer and having a first slope having a width gradually decreasing toward the lower surface of the first insulating layer; and

a second sidewall adjacent to the lower surface of the first insulating layer and having a second slope having a width gradually decreasing toward the upper surface of the first insulating layer.

4 . The circuit board of claim 3 , wherein the second insulating layer includes:

a first portion disposed on the first insulating layer; and

a second portion protruding downward from the first portion and disposed in the first opening, and

wherein the second portion of the second insulating layer includes the first slope and the second slope.

5 . The circuit board of claim 3 , wherein the first insulating layer further includes a first through hole spaced apart from the first opening in a horizontal direction.

6 . The circuit board of claim 5 , further comprising:

a via electrode disposed in the first through hole,

wherein the first circuit pattern layer is connected to the via electrode.

7 . The circuit board of claim 6 , wherein the via electrode includes:

a first overlapping portion overlapping the first sidewall in a horizontal direction; and

a second overlapping portion overlapping the second sidewall in the horizontal direction,

wherein the first overlapping portion is inclined in the same direction as a direction in which the first sidewall is inclined, and

wherein the second overlapping portion is inclined in a direction different from a direction in which the second sidewall is inclined.

8 . The circuit board of claim 6 , wherein the via electrode has an inclination in which a width gradually decreases from an upper surface of the via electrode to a lower surface of the via electrode.

9 . The circuit board of claim 6 , wherein a plurality of second openings are provided to be spaced apart from each other in the first electrode.

10 . The circuit board of claim 9 , wherein the plurality of second openings have a diameter ranging from 100 μm to 300 μm.

11 . The circuit board of claim 9 , wherein a distance between second openings adjacent to each other among the plurality of second openings is in a range of 25 μm to 50 μm.

12 . The circuit board of claim 6 , wherein the second insulating layer includes a third opening overlapping the second opening in a vertical direction and passing through at least a part of the second insulating layer from an upper surface of the second insulating layer toward a lower surface of the second insulating layer.

13 . The circuit board of claim 12 , further comprising:

a third insulating layer disposed on the second insulating layer,

wherein the third insulating layer is provided to fill the third opening.

14 . The circuit board of claim 12 , further comprising:

a protective layer disposed on the second insulating layer,

wherein the protective layer is provided to fill the third opening.

15 . The circuit board of claim 13 , wherein at least one of the first opening and the third opening is provided as a recess that does not pass through at least one of the first insulating layer and the third insulating layer.

16 . The circuit board of claim 13 , wherein the circuit board includes a dummy region, and

wherein the first opening and the third opening are provided in the dummy region.