Folder-type portable communication device having flexible display unit

1. A portable communication device, comprising:

a main housing;

a folding housing coupled to the main housing by a hinge unit to rotate about a hinge axis; and

a flexible display unit that is drawn out from the main housing to open its display screen when the folding housing unfolds,

wherein the hinge unit is a dual-axis hinge and provides a first hinge axis and a second hinge axis,

wherein the first hinge axis and the second hinge axis are parallel to each other, and

wherein the folding housing rotates up to a maximum angle of 180 degrees relative to a top surface of the main housing facing the folding housing.

2. The portable communication device of claim 1 , wherein a longitudinal direction of the main housing is parallel to the hinge axis.

3. The portable communication device of claim 1 , wherein the flexible display unit is stored in the main housing in a rolled-up state and unrolls when the folding housing unfolds, and an end of the flexible display unit is coupled to the folding housing.

4. A portable communication device, comprising:

a main housing;

a protrusion unit extending along a side end of the main housing;

a folding housing coupled to the main housing by a hinge unit to rotate about a hinge axis; and

a flexible display unit that is drawn out from the protrusion unit to open its display screen when the folding housing unfolds,

wherein the hinge unit is a dual-axis hinge and provides a first hinge axis and a second hinge axis,

wherein the first hinge axis and the second hinge axis are parallel to each other,

wherein the folding housing rotates up to a maximum angle of 180 degrees relative to a top surface of the main housing facing the folding housing, and

wherein the protrusion unit protrudes from the top surface of the main housing by a determined height.

5. The portable communication device of claim 4 , wherein the flexile display unit is stored in the protrusion unit in a rolled-up state and is drawn out from the protrusion unit when the folding housing unfolds.

6. The portable communication device of claim 5 , wherein the amount by which the flexible display unit is drawn out is proportional to the amount by which the folding housing unfolds.

7. A portable communication device, comprising:

a main housing comprising a plurality of first keys that are always exposed;

a folding housing coupled to the main housing by a hinge unit to rotate about a hinge axis; and

a flexible display unit that is drawn out from the main housing to open its display screen when the folding housing unfolds,

wherein the hinge unit is a dual-axis hinge and provides a first hinge axis and a second hinge axis,

wherein the first hinge axis and the second hinge axis are parallel to each other, and

wherein the folding housing rotates up to a maximum angle of 180 degrees relative to a top surface of the main housing facing the folding housing.

8. The portable communication device of claim 7 , wherein a protrusion unit extends along a side end of the main housing and the first keys are arranged on a top face of the protrusion unit, and the protrusion unit protrudes from a top surface of the main housing facing the folding housing by a determined height.

9. The portable communication device of claim 7 , wherein the flexible display unit is mounted on an external face of the folding housing and a plurality of second keys is disposed adjacent to the flexible display unit.

10. The portable communication device of claim 8 , wherein the flexible display unit is stored in the protrusion unit in a rolled-up state and is drawn out from the protrusion unit when the folding housing unfolds.

11. The portable communication device of claim 7 , wherein the amount by which the flexible display unit is drawn out is proportional to the amount by which the folding housing unfolds.

12. The portable communication device of claim 7 , wherein the flexible display unit is a flexible liquid crystal display device.