Torsion spring assembly and portable electronic device with torsion spring assembly

A portable electronic device, comprising:

• a torsion spring assembly having a roller and a torsion spring body, wherein the torsion spring body has a first coil part, a second coil part, a first extension part and a second extension part, the first coil part is connected to the second coil part, the first extension part is extended to one end of the first coil part, which is away from a junction of the first coil part and the second coil part, the second extension part is extended to one end of the second coil part, which is away from the connection of the first coil part and the second coil part, a winding direction of the first coil part is perpendicular to a winding direction of the second coil part, and the roller is connected to the first extension part;
• and
• an electronic device having a host unit and a display unit, wherein the first coil part and the first extension part are located at the host unit, the second coil part and the second extension part are located at the display unit, the host has a sliding groove disposed at one side of the host unit, the display unit has a fastener unit disposed corresponding to the sliding groove, the roller rolls within the host unit, and the second extension part is against the display unit;
• when the fastener element is connected to the sliding groove, the display unit is slidable relative to the host unit between a first position and a second position, and when the fastener element is departed from the sliding groove, the second extension part of the torsion spring body turns the display unit with an angle.