A sliding display device includes a housing, a flexible display panel, a first roller, and a second roller. The housing includes a display region between a first edge region and a second edge region. The distance between the first and second edge regions changes as the housing is expanded and contracted. The flexible display panel slides into and out from the housing through the first and second edge regions as the housing expands and contracts. The first and second rollers guide panel regions into and out of empty spaces in the housing. An assistant roller assists in moving one of the panel regions along a non-intersecting path.