Display apparatus having a light-emitting device and heating signal wiring on bezel area, and method of forming thereof
A display apparatus including a light-emitting device is disclosed. The light-emitting device is on a display area of a device substrate. An overcoat layer is disposed between the device substrate and the light-emitting device. The overcoat layer extends on a bezel area of the device substrate. A heating signal wiring is between the bezel area of the device substrate and the overcoat layer. A heating pattern electrically connected to the heating signal wiring is on the over-coat layer of the bezel area. A surface of the heating pattern opposite to the device substrate may be in contact with an adhesive layer covering the light-emitting device. Thus, in the display apparatus, the damage of the light-emitting device due to external moisture may be prevented or at least reduced.
1 . A display apparatus comprising:
a device substrate including a display area and a bezel area that at least partially surrounds the display area;
an overcoat layer on the display area and the bezel area of the device substrate;
a light-emitting device on a portion of the overcoat layer that is on the display area, the light-emitting device configured to emit light;
a heating signal wiring between the device substrate and the portion of the overcoat layer on the bezel area;
a plurality of heating patterns on the portion of the overcoat layer that is on the bezel area, the plurality of heating patterns electrically connected to the heating signal wiring;
an adhesive layer on the light-emitting device in the display area and on the plurality of heating patterns in the bezel area, the adhesive layer in contact with the plurality of heating patterns; and
an encapsulation substrate on the adhesive layer, the encapsulation substrate on the display area and the bezel area of the device substrate.
2 . The display apparatus according to claim 1 , wherein the heating signal wiring extends along an edge of the display area, and the plurality of heating patterns are disposed side by side along the heating signal wiring.
3 . The display apparatus according to claim 1 , wherein each of the plurality of heating patterns includes a portion that extends outside of the heating signal wiring such that the portion is non-overlapping with the heating signal wiring.
4 . The display apparatus according to claim 3 , wherein each of the plurality of heating patterns includes a region that extends in a same direction as the heating signal wiring.
5 . The display apparatus according to claim 3 , wherein each of the plurality of heating patterns has a shape that is symmetrical with respect to the heating signal wiring.
6 . The display apparatus according to claim 1 , wherein the light-emitting device includes a first electrode, a light-emitting layer on the first electrode, and a second electrode on the light-emitting layer, and
wherein the plurality of heating patterns include a material that is a same as a material of the first electrode of the light-emitting device.
7 . The display apparatus according to claim 1 , further comprising:
at least one moisture-blocking trench penetrating through a thickness of the portion of the overcoat layer in the bezel area, the at least one moisture-blocking trench extending in parallel along a length of the heating signal wiring; and
a barrier pattern in the moisture-blocking trench, the barrier pattern covering a side of the moisture-blocking trench.
8 . The display apparatus according to claim 7 , wherein the barrier pattern includes a same material as the plurality of heating patterns.
9 . The display apparatus according to claim 7 , further comprising:
a lower passivation layer between the device substrate and the portion of the overcoat layer in the bezel area, the lower passivation layer on the heating signal wiring.
10 . The display apparatus according to claim 7 , further comprising:
a moisture-blocking hole between the heating signal wiring and the moisture-blocking trench, the moisture-blocking hole penetrating through the thickness of the overcoat layer,
wherein a portion one of the plurality of heating patterns is inside of the moisture-blocking hole.
11 . The display apparatus according to claim 1 , further comprising:
a pixel driving circuit on the display area of the device substrate, the pixel driving circuit electrically connected to the light-emitting device;
at least one signal wiring electrically connecting the pixel driving circuit and a pad portion that is on the bezel area of the device substrate; and
a heating pad on the bezel area of the device substrate, the heating pad electrically connected to the heating signal wiring to supply a current to the heating signal wiring.
12 . A display apparatus comprising:
a substrate including a display area and a bezel area that at least partially surrounds the display area;
a light-emitting device in the display area, the light-emitting device including a first electrode in the display area, a light-emitting layer including a first portion on the first electrode in the display area and a second portion that extends from the first portion of the light-emitting layer to the bezel area, and a second electrode including a first portion on the first portion of the light-emitting layer in the display area and a second portion that extends from the first portion of the second electrode to the bezel area;
a heating signal wiring on the bezel area of the substrate and partially surrounds the display area, the heating signal wiring configured to apply a current,
wherein the second portion of the light-emitting layer in the bezel area and the second portion of the second electrode in the bezel area are non-overlapping with the heating signal wiring.
13 . The display apparatus of claim 12 , further comprising:
a plurality of heating patterns in the bezel area, the plurality of heating patterns electrically connected to the heating signal wiring.
14 . The display apparatus of claim 13 , further comprising:
an overcoat layer including a portion in the display area and a portion in the bezel area, the portion of the overcoat layer in the bezel area between the heating signal wiring and the plurality of heating patterns.
15 . The display apparatus of claim 14 , further comprising:
a trench through a thickness of the overcoat layer; and
a barrier pattern in the trench, the barrier pattern including a same material as the plurality of heating patterns.
16 . The display apparatus of claim 15 , wherein the second portion of the light-emitting layer in the bezel area and the second portion of the second electrode in the bezel area are on the barrier pattern in the trench.
17 . The display apparatus of claim 16 , wherein a part of the barrier pattern, a part of the second portion of the light-emitting layer, and a part of the second portion of the second electrode extend out of the trench onto the overcoat layer towards the heating signal wiring.
18 . The display apparatus of claim 15 , further comprising:
a hole that penetrates through the thickness of the overcoat layer, the hole between the trench and the heating signal wiring,
wherein a portion of one of the plurality of heating patterns is in the hole.
19 . The display apparatus of claim 13 , wherein the plurality of heating patterns includes a first heating pattern having a first shape and a second heating pattern having a second shape that is different from the first shape.
20 . A method of forming a display apparatus comprising:
forming a substrate including a display area and a bezel area that at least partially surrounds the display area;
forming a heating signal wiring on the bezel area of the substrate that partially surrounds the display area;
forming an overcoat layer including a portion that is on the display area and a portion that is on the heating signal wiring in the bezel area;
forming a first electrode on the portion of the overcoat layer in the display area and a plurality of heating patterns on the portion of the overcoat layer in the bezel area, the plurality of heating patterns electrically connected to the heating signal wiring;
forming a light-emitting layer including a first portion that is on the first electrode in the display area and a second portion that extends from the first portion of the light-emitting layer to the bezel area such that a part of the second portion of the light-emitting layer is on the plurality of heating patterns;
forming a second electrode including a first portion that is on the first portion of the light-emitting layer in the display area and a second portion that extends from the first portion of the second electrode to the bezel area such that a part of the second portion of the second electrode is on the part of the second portion of the light-emitting layer that is on the plurality of heating patterns; and
removing the part of the second portion of the light-emitting layer and the part of the second portion of the second electrode by applying a current to the heating signal wiring that supplies the current to the plurality of heating patterns.