Electronic device with display of continuously adjustable area

1. An electronic device with a display of a continuously adjustable area, the electronic device comprising:

a frame comprising:

a surface defined with a first direction;

a capacity; and

a window formed on the surface and interlinking the capacity;

a flexible display panel having a predetermined length longer than a length of the window along the first direction, the flexible display panel comprising:

a first side;

a second side opposite to the first side; and

a first section and a second section between the first side and the second side;

a detent unit comprising:

a first arresting element and a second arresting element established in the flexible display panel and the window separately;

wherein the first arresting element and the second arresting element are capable of generating interference; the relative motion between the flexible display panel and the window is not affected when an external force is greater than the interference; when the first side is pulled in the first direction away from the window, a part of the first section leaves the window and a part of the second section is exposed in the window; and when the external force pulling the first side finishes, the detent unit may position the flexible display panel; and

a recovering unit located in the capacity for recovering the exposed part of the second section, the recovering unit comprising:

a first end connected to the second side of the flexible display panel; and

a second end connected to the frame.

2. The electronic device of claim 1 wherein the flexible display panel is an organic light emitting display (OLED) panel.

3. The electronic device of claim 1 wherein the recovering unit is a torsion fragment, the first end of the recovering unit is located marginally, and the second end of the recovering unit is located centrally.

4. The electronic device of claim 1 further comprising a leading element oriented perpendicular to the first direction, able to rotate around the axis of itself, and established in the capacity.

5. The electronic device of claim 4 wherein the flexible display panel has a minimum curve radius close to a curvature ratio of the leading element.

6. The electronic device of claim 1 further comprising a pulling element for helping pulling, established at an end of the first section away from the second section.

7. The electronic device of claim 1 wherein the first arresting element is a gear and the second arresting element is a rack.

8. The electronic device of claim 7 wherein the first arresting element is established in the window and the second arresting element is established in the flexible display panel oppositely.

9. The electronic device of claim 1 further comprising:

a counter capable of detecting a moving distance of the detent unit, wherein the counter is established on the frame; and

a controller capable of adjusting the display area of the electronic device, wherein the controller is established on the frame and is electrically connected to the detent unit.

10. The electronic device of claim 9 wherein the counter is an optical grating counter.