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1. A display device, comprising: a display unit at least partially foldable and transformable, and including a display surface configured to display an image; a body unit provided at a back face of the display unit; a sensor having a detecting surface positioned to be covered with the display unit or the body unit; and a cover unit joined to the body unit, such that to cover the display unit and to at least render the display device dustproof, wherein the display device has a switchable state between a covering state in which the detecting surface is covered and an uncovering state in which the detecting surface is uncovered, the uncovering state being switched from the covering state by a folding transformation of the display unit, the body unit includes: a first casing including a first setting face on which the display unit is set, the first setting face being provided with the sensor; a second casing disposed adjacent to the first casing, and including a second setting face on which the display unit is set; a casing joining unit rotatably joining, about an axis, an end portion of the first casing and an end portion of the second casing; and a fastening unit fastening the second setting face and the display unit together, the covering state is set in an unfolded state in which the first casing and the second casing are arranged such that the first setting face and the second setting face form a horizontal surface, the uncovering state is set in a folded state in which the first casing and the second casing are folded with the casing joint unit such that the first setting face and the second setting face are oriented outward, the cover is foldable and transformable, the display device further comprises: a roller unit provided at an end portion of the first casing, across from a location at which the first casing and the second casing are joined, and rotatably configured to guide and fold the cover unit back to the back face of the display unit; and a transparent sealing member provided between the display unit and the cover unit and fastening the cover unit to the display unit, and in switching from the unfolded state to the folded state, the cover unit moves, together with the display unit, in a first direction away from the detecting surface, and as a result, a portion of the cover unit is folded back by the roller unit and moves from the back face to a front face of the display unit.
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