Display device having multiple insulating layers of same material

1. A display device comprising:

a base layer;

a first pattern disposed on the base layer;

an insulating layer disposed on the first pattern and including a plurality of layers including a first layer, a second layer directly on the first layer, a third layer directly on the second layer, and a fourth layer directly on the third layer; and

a second pattern disposed on the insulating layer,

wherein

the first layer and the third layer include a same material,

the second layer and the fourth layer include a same material,

the first pattern includes a portion that contacts the third layer, and

the first layer and the second layer do not overlap the portion of the first pattern.

2. The display device of claim 1 , wherein the first layer, the second layer, the third layer, and the fourth layer each include a same material.

3. The display device of claim 1 , wherein

the first layer and the second layer include different materials.

4. The display device of claim 3 , wherein the first layer and the second layer different hydrogen contents or different densities.

5. The display device of claim 1 , wherein

the first layer and the second layer are part of a lower layer of the insulating layer;

the third layer and the fourth layer are part of an upper layer of the insulating layer;

the lower layer and the upper layer of the insulating layer include different numbers of layers.

6. The display device of claim 1 , further comprising:

a substrate;

a light blocking layer disposed on the substrate;

a buffer layer disposed on the light blocking layer;

a semiconductor layer of a transistor disposed on the buffer layer;

a gate insulating layer disposed on the semiconductor layer of the transistor;

a gate electrode of the transistor disposed on the semiconductor layer of the transistor;

an interlayer insulating layer disposed on the gate electrode;

an electrode of the transistor disposed on the interlayer insulating layer; and

a passivation layer disposed on the electrode of the transistor,

wherein the insulating layer is one of the buffer layer, the gate insulating layer, the interlayer insulating layer, and the passivation layer.

7. The display device of claim 6 , wherein the first pattern is one of the light blocking layer, the semiconductor layer of the transistor, the gate electrode, and the electrode of the transistor.

8. The display device of claim 7 , further comprising:

a connection electrode disposed on the passivation layer,

wherein the second pattern is one of the semiconductor layer of the transistor, the gate electrode, the electrode of the transistor, and the connection electrode.

9. A display device comprising:

a substrate;

a buffer layer disposed on the substrate;

a semiconductor layer of a transistor disposed on the buffer layer;

a gate insulating layer disposed on the semiconductor layer of the transistor;

a gate electrode of the transistor disposed on the semiconductor layer of the transistor;

an interlayer insulating layer disposed on the gate electrode;

an electrode of the transistor disposed on the interlayer insulating layer; and

a passivation layer disposed on the electrode of the transistor,

wherein

at least one of the buffer layer, the gate insulating layer, the interlayer insulating layer, and the passivation layer includes a plurality of layers including a first layer, a second layer directly on the first layer, a third layer directly on the second layer, and a fourth layer directly on the third layer,

the first layer and the third layer include a same material,

the second layer and the fourth layer include a same material,

a pattern disposed below the first layer includes a portion that contacts the third layer, and

the first layer and the second layer do not overlap the portion of the pattern.

10. The display device of claim 9 , wherein

the first layer, the second layer, the third layer, and the fourth layer are stacked sequentially.

11. The display device of claim 10 , wherein the first layer and the second layer include different materials or include a different composition ratio, hydrogen content, and density.

12. The display device of claim 9 , wherein

the first layer, the second layer, the third layer, and the fourth layer are stacked sequentially, and

the first layer and the fourth layer include a same material.

13. The display device of claim 12 , wherein

the plurality of layers further include a fifth layer stacked on the fourth layer, and

the third layer and the fifth layer include a same material.

14. The display device of claim 12 , wherein

the plurality of layers further include a fifth layer and a sixth layer stacked sequentially on the fourth layer, and

the third layer and the fifth layer include a same material.

15. The display device of claim 1 , wherein the first layer has one or more film qualities different from the second layer, the different film qualities including at least one of different hydrogen ratios, different hydrogen contents, and different densities.

16. The display device of claim 15 , wherein the third layer has one or more film qualities different from the fourth layer, the different film qualities including at least one of different hydrogen ratios, different hydrogen contents, and different densities.