Display device

A display device, which comprises:

• a back plate;
• a lightguiding plate disposed on the back plate;
• an optical film disposed on the lightguiding plate;
• the optical film comprising at least one positioning section;
• the positioning section comprising a first extending section extending out from a margin of the optical film, and a second extending section connected with the first extending section;
• a positioning unit being disposed closed to the optical film and fixed on the back plate;
• the positioning unit comprising a main section and a hold down section connected to the main section;
• a groove of the first extending section being disposed on the main section;
• the hold down section holding down the second extending section on the back plate
• and the hold down section being disposed vertically to the main section;
• the hold down section comprising a bottom side toward to a back side of the back plate and a top side away from the back side of the back plate;
• the bottom side holding down the second extending section;
• the top side supporting the display panel of the display device;
• the width of the groove being identical or close to the width of the first extending section;
• the length of the groove being identical or close to the extending length of the first extending section;
• and
• the length between the hold down section and the back plate being identical or close to the thickness of the second extending section.