Display device and manufacturing method thereof
View Patent ↗In an organic EL display device, an improvement in the performance of a barrier film that blocks entry of a substance that causes degradation, such as moisture, into an organic electroluminescent element is achieved. The organic EL display device includes the barrier film, which is a stacked film including a barrier base material layer made of silicon oxide or silicon nitride and a base material coating layer in contact with an impregnated barrier base material layer. The barrier film blocks transmission of a substance that degrades the organic electroluminescent element. Nano-ink is applied on a surface of the barrier base material layer, and the barrier base material layer is impregnated with the nano-ink. The barrier base material layer subjected to the impregnation treatment serves as the impregnated barrier base material layer, while the nano-ink after impregnation serves as the base material coating layer.
1. A display device comprising:
a base material made of a resin material;
an organic electroluminescent element provided on the base material; and
a barrier film including a first layer and a second layer, the first layer containing silicon oxide or silicon nitride, the second layer being in contact with a surface of the first layer,
wherein the surface has pores, and
the pores are filled with a part of the second layer.
2. The display device according to claim 1 , wherein
the first layer is impregnated with the part of the second layer.
3. The display device according to claim 2 , wherein
each of the pores is a void of particles made of the silicon oxide or the silicon nitride.
4. The display device according to claim 2 , wherein
each of the pores is a defect existing in the first layer.
5. The display device according to claim 2 , wherein
the part of the second layer is a nanoparticle.
6. The display device according to claim 2 , wherein
the part of the second layer contains, as a main component, any one of aluminum, silver, an acrylic resin, a fluorine resin, and carbon.
7. The display device according to claim 1 , wherein
the barrier film is located on and in physical contact with the base material.
8. The display device according to claim 1 , further comprising, between the base material and the organic electroluminescent element, a circuit portion including a thin film transistor, wherein
the barrier film is located between the base material and the circuit portion.
9. The display device according to claim 1 , wherein
the organic electroluminescent element includes a lower electrode, a light-emitting layer, and an upper electrode, and
the barrier film is located on a side of the organic electroluminescent element opposite to the base material and is in contact with the upper electrode.
10. The display device according to claim 1 , further comprising a counter base material facing the base material, wherein
a filling material is disposed between the base material and the counter base material, and
the barrier film is located between the counter base material and the filling material.
11. The display device according to claim 1 , wherein
the barrier film includes a third layer containing silicon oxide or silicon nitride on a side of the second layer opposite to the first layer.