Display device and tiled display device including the same

A display device comprising:

• a barrier layer made of an inorganic material, wherein a first contact hole is defined in the barrier layer;
• a first connection line disposed on the barrier layer and inserted into the first contact hole;
• a substrate covering the first connection line and the barrier layer;
• a thin-film transistor layer disposed on the substrate and including at least one thin-film transistor;
• and
• a pad part disposed on a lower surface of the barrier layer and connected to the first connection line through the first contact hole,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the barrier layer and the substrate.

A display device comprising:

• a first substrate, wherein a first contact hole is defined in the first substrate;
• a barrier layer disposed on one surface of the first substrate and through which the first contact hole passes;
• a first connection line disposed on a surface of the barrier layer and connected to a pad part disposed on a lower surface of the first substrate opposite the one surface of the first substrate;
• a second substrate covering the first connection line and the barrier layer;
• and
• a thin-film transistor layer disposed on a surface of the second substrate and including at least one thin-film transistor,
• wherein the pad part is connected to the first connection line through the first contact hole, and
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the barrier layer and the second substrate.

A display device comprising:

• a first substrate, wherein a first contact hole is defined in the first substrate;
• a first barrier layer disposed on the first substrate, wherein a second contact hole is defined in the first barrier layer and connected to the first contact hole;
• a first connection line disposed on the first barrier layer and inserted into the second contact hole;
• a second barrier layer covering the first connection line and the first barrier layer;
• a thin-film transistor layer disposed on the second barrier layer and comprising at least one thin-film transistor;
• and
• a pad part disposed on a lower surface of the first substrate and connected to the first connection line through the first contact hole,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the first barrier layer and the second barrier layer.

A display device comprising:

• a first barrier layer made of an inorganic material, wherein a first contact hole is defined in the first barrier layer;
• a first connection line disposed on the first barrier layer and inserted into the first contact hole;
• a second barrier layer covering the first connection line and the first barrier layer;
• and
• a thin-film transistor layer disposed on the second barrier layer and comprising at least one thin-film transistor;
• and
• a pad part disposed on a lower surface of the first barrier layer and connected to the first connection line through the first contact hole,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the first barrier layer and the second barrier layer.

A display device comprising:

• a first substrate, wherein a first contact hole is defined in the first substrate;
• a first connection line disposed on the first substrate;
• a barrier layer covering the first connection line and the first substrate;
• a second substrate disposed on the barrier layer and planarizing the top of the barrier layer;
• a thin-film transistor layer disposed on the second substrate and comprising at least one thin-film transistor;
• and
• a pad part disposed on a lower surface of the first substrate and connected to the first connection line through the first contact hole,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the first substrate and the barrier layer.

A display device comprising:

• a first substrate, wherein a first contact hole is defined in the first substrate;
• a first barrier layer disposed on the first substrate and comprising a second contact hole connected to the first contact hole;
• a first connection line disposed on the first barrier layer and inserted into the second contact hole;
• a second barrier layer covering the first connection line and the first barrier layer;
• a second substrate disposed on the second barrier layer and planarizing the top of the second barrier layer;
• and
• a thin-film transistor layer disposed on the second substrate and comprising at least one thin-film transistor,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor.

A tiled display device comprising:

• a plurality of display devices, each including a display area having a plurality of pixels and a non-display area surrounding the display area;
• and
• a coupling member coupling the display devices together,
• wherein each of the display devices includes:
• a first substrate wherein a first contact hole is defined in the first substrate;
• a barrier layer disposed on the first substrate, wherein a second contact hole is defined in the barrier layer and connected to the first contact hole;
• a first connection line disposed on the barrier layer and inserted into the second contact hole;
• a second substrate covering the first connection line and the barrier layer;
• a thin-film transistor layer disposed on the second substrate and including at least one thin-film transistor;
• and
• a pad part disposed on a lower surface of the first substrate and connected to the first connection line through the first contact hole,
• wherein the thin-film transistor layer further includes a second connection line connected between the first connection line and the at least one thin-film transistor, and the first connection line extends in a layer between the barrier layer and the second substrate.