Flexible organic light emitting display device and method for manufacturing the same
There is provided a flexible display having a new wire structure and a new insulating layer structure. A flexible display includes a flexible substrate having a first area and a second area. The second area is curved in a non-zero angle relative to the plane of the first area. The flexible display further includes a plurality of wires that extend over from the first area to the second area of the flexible substrate. Each of the wires is covered by an upper insulating pattern, which is separated from other upper insulating pattern. Each upper insulating pattern covering the wire has substantially the same trace pattern shape of the corresponding wire thereunder. Accordingly, by adopting the above-described wire structure and upper insulating layer structure, crack generation and propagation in the wires and the insulating layers from bending of the flexible display can be minimized.
1. A flexible organic light emitting diode (OLED) display, comprising:
a flexible substrate having a display area and a bending area adjacent to the display area;
a display unit in the display area of the flexible substrate, the display unit having a thin-film transistor and an OLED element;
a wire electrically connected to the display unit in the display area and extending into the bending area of the flexible substrate, the wire having a trace pattern arranged in an orthogonal direction relative to a boundary between the display area and the bending area of the flexible substrate;
an upper insulating pattern on the wire, the upper insulating pattern having substantially the same trace pattern as the wire thereunder; and
a lower insulating layer between the flexible substrate and the wire in the bending area,
wherein the lower insulating layer includes a lower insulating pattern extending non-parallel to a general direction in which the wire extends from the display area to the bending area,
wherein the lower insulating layer has a plurality of discontinuous pieces of the lower insulating pattern separated from each other.
2. The flexible OLED display according to claim 1 , wherein the wire and the upper insulating layer are in direct contact with each other.
3. The flexible OLED display according to claim 1 , wherein the wire is made of the same material as at least one of a gate electrode, a source electrode and a drain electrode of the thin-film transistor.
4. The flexible OLED display according to claim 3 , wherein the wire is made of the same material as that of the gate electrode, the upper insulating layer and at least one of an interlayer insulating layer and a passivation layer of the display unit being made of the same material, and the lower insulating layer and at least one of a buffer layer and a gate insulating layer being made of the same material.
5. The flexible OLED display according to claim 3 , wherein the wire is made of the same material as at least one of the source electrode and the drain electrode, the upper insulating layer and a passivation layer in the display unit being made of the same material, and the lower insulating layer and at least one of a buffer layer, a gate insulating layer and an interlayer insulating layer being made of the same material.
6. The flexible OLED display according to claim 1 , wherein the trace pattern of the wire is at least one of a diamond trace pattern, a triangle-wave trace pattern, a sine-wave trace pattern and a trapezoid-wave trace pattern.
7. The flexible OLED display according to claim 1 , further comprising:
a protective layer on the upper insulating layer in the bending area.
8. The flexible OLED display according to claim 1 , wherein the wire serves as a touch sensor for the flexible OLED display.
9. The flexible OLED display according to claim 1 , further comprising:
a cover glass on the display area and/or the bending area of the flexible OLED display.
10. The flexible OLED display according to claim 1 , wherein the lower insulating pattern has at least two base insulating layers of different sizes being stacked on each other.
11. The flexible OLED display according to claim 10 , wherein the at least two base insulating layers have a first base insulating layer and a second base insulating layer, and
the cross-sectional width of the first base insulating layer is wider than the cross-sectional width of the second base insulating layer.
12. The flexible OLED display according to claim 10 , the lower insulating pattern has a stair-like structure.