| CPC G06F 3/14 (2013.01) [G02B 27/0955 (2013.01)] | 20 Claims |

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1. A display device, comprising:
a display configured to output a screen output along a first direction; and
a lens assembly including at least three lenses arranged sequentially along an optical axis and configured to focus or guide the screen output in a predetermined direction or to a predetermined position, wherein the lens assembly is configured to reflect the screen output at least twice between a first lens, among the at least three lenses, disposed farthest from the display and a nth lens, among the at least three lenses, disposed closest to the display,
wherein the display is disposed to be movable in a direction crossing the first direction or in a direction crossing the optical axis, and
wherein the display device satisfies a [Conditional expression 1] regarding a diagonal length (DSP) of the display and a distance (MD) from the optical axis to a center of the display measured along a direction which is perpendicular to the optical axis,
wherein the [Conditional expression 1] is given by 0.02<=MD/DSP<=0.2.
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