According to an embodiment of the present invention, a foldable display device capable of correcting screen deviation without physical modification between display modules comprises: a first display module having a first display panel; a second display module having a second display panel; and a host system connected to the first and second display modules. The first and second display panels have an active region. The active area includes a display area in which an input image is displayed and a dummy area in which the input image is shifted and displayed.;COPYRIGHT KIPO 2018
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