US Patent 10223942 Rollable display device

A rollable display device is disclosed, comprising a flexible display screen, a housing, a roller pivoted onto the housing and a holder mounted onto the housing. At least one of a third side and a fourth side of the flexible display screen which are connected with a first side and a second side is provided with a first locking element, and the holder is provided with a second locking element. The first locking element and the second locking element are magnetically connected to maintain relative positional relationship between the flexible display screen and the holder when the holder and the flexible display screen are expanded.