Mobile terminal
Disclosed herein is a mobile terminal including a first frame, a second frame slideably movable from the first frame in a first direction or a second direction opposite to the first direction, a slide frame movable in the first or second direction with respect to the second frame, a magnetic roller rotatably coupled to one side of the second frame, a flexible display including a first region coupled to the first frame, a second region coupled to the slide frame, and a third region disposed between the first and second regions and bent around the magnetic roller, and a rolling plate attached to the flexible display. The magnetic roller provides magnetic force to cause the rolling plate to be attached to the magnetic roller. The mobile terminal may maintain the display in a flat state during movement of the second frame by preventing the display from being separated.
1. A mobile terminal comprising:
a first frame;
a second frame slidably movable with respect to the first frame along a first direction or a second direction opposite to the first direction;
a slide frame movable along the first direction or the second direction with respect to the second frame;
a magnetic roller coupled to one side of the second frame to be rotatable about a rotation axis extending along a third direction perpendicular to the first direction;
a flexible display comprising a first region coupled to the first frame, a second region coupled to the slide frame, and a third region disposed between the first region and the second region, the third region being bent to surround the magnetic roller; and
a rolling plate attached to a rear surface of the flexible display,
wherein the magnetic roller provides a magnetic force such that the rolling plate is attached to an outer circumferential surface of the magnetic roller.
2. The mobile terminal of claim 1 , wherein the magnetic roller has polarities varying along the outer circumferential surface thereof.
3. The mobile terminal of claim 2 , wherein the magnetic roller has two or more N-poles and two or more S-poles, the two or more N-poles and two or more S-poles being alternately arranged along the outer circumferential surface of the magnetic roller.
4. The mobile terminal of claim 1 , wherein the magnetic roller is formed to have a cylindrical shape by combining a plurality of fan-shaped sintered column magnets.
5. The mobile terminal of claim 4 , wherein each of the fan-shaped sintered column magnets has opposite poles, the opposite poles of each of the fan-shaped sintered column magnets being arranged on a side facing an outer surface of the fan-shaped sintered column magnet and a side facing the rotation axis, respectively.
6. The mobile terminal of claim 1 , wherein the magnetic roller has an axial hole extending along the third direction, and
wherein the mobile terminal further comprises:
a roller shaft press-fitted into the axial hole.
7. The mobile terminal of claim 6 , further comprising:
a roller bearing fitted onto the roller shaft and disposed on both sides of the roller shaft,
wherein the second frame comprises a seating portion, the roller bearing being seated on the seating portion.
8. The mobile terminal of claim 6 , wherein the roller shaft contains a metal material.
9. The mobile terminal of claim 1 , wherein the magnetic roller comprises a plurality of magnetic rollers arranged along the third direction.
10. The mobile terminal of claim 1 , wherein the rolling plate comprises a plurality of support bars extending along the third direction perpendicular to the first direction and arranged side by side along the first direction, the support bars being formed of a metal material.
11. The mobile terminal of claim 10 , wherein each of the support bars contains ferrosilicon (FeSi).
12. The mobile terminal of claim 10 , wherein each of the support bars has a curved surface corresponding to a curvature of the magnetic roller.
13. The mobile terminal of claim 10 , wherein the rolling plate further comprises a magnetic shielding sheet, the magnetic shielding sheet having a first surface attached to the support bars and a second surface coupled to the flexible display, wherein the second surface is opposite the first surface.
14. The mobile terminal of claim 10 , wherein a side portion of the second frame has an opening positioned on a front side,
wherein the side portion of the second frame comprises an expanded side portion positioned at an end of a corresponding one of the support bars and expanded to be wider than a cross section of the corresponding one of the support bars, and
wherein at least a part of the expanded side portion is exposed through the opening when the second frame moves along the first direction.
15. The mobile terminal of claim 1 , further comprising:
a first magnet positioned on a rear surface of the second frame and configured to provide a magnetic force to pull the rolling plate or the slide frame.
16. The mobile terminal of claim 15 , further comprising:
a second magnet positioned on a front surface of the slide frame and having a polarity opposite of a polarity of the first magnet.
17. The mobile terminal of claim 16 , wherein the first magnet has N-poles and S-poles alternately arranged along the third direction perpendicular to the first direction, and
wherein the second magnet has S-poles and N-poles alternately arranged along the third direction to exhibit the polarity opposite of the polarity of the first magnet.
18. The mobile terminal of claim 1 , further comprising:
a first magnet positioned on a rear surface of the second frame and configured to provide a magnetic force to pull the slide frame or the flexible display.
19. The mobile terminal of claim 18 , further comprising:
a second magnet positioned on a front surface of the slide frame and having a polarity opposite of a polarity of the first magnet,
wherein the first magnet has N-poles and S-poles alternately arranged along the third direction perpendicular to the first direction, and
wherein the second magnet has S-poles and N-poles alternately arranged along the third direction to exhibit the polarity opposite of the polarity of the first magnet.
20. The mobile terminal of claim 18 , further comprising:
a low-friction layer attached to a surface of the first magnet.