Middle frame for supporting flexible display and a flexible display device

A flexible display device, comprising

• a middle frame, and
• a flexible display positioned in the middle frame,
• wherein the middle frame includes a middle frame element,
• wherein the flexible display includes a flexible substrate, a printing wiring board at positioned on lateral side of the flexible substrate,
• wherein at least one of two lateral sides on the flexible substrate adjacent the printing wiring board has a protrusion portion;
• wherein a first through groove and a second through groove are respectively located on lateral sides of the middle frame corresponding to the flexible display which are corresponding to the printing wiring board and the protrusion portion,
• wherein the protrusion portion fixed in the second through groove, and partial wiring board of the printing wiring board fixed in the first through groove;
• and
• wherein first spacers are positioned between the first through groove and two lateral sides of the printing wiring board, and second spacers are positioned between the second through groove and two lateral sides of the protrusion portion.