Dual directional sliding hinge and portable device

A dual directional sliding hinge comprising:

• a main panel;
• a first sliding unit mounted slidably on the main panel;
• and
• a second sliding unit mounted slidably on the main panel,
• wherein when the first and second sliding units are located at a closing position, the first and second sliding units have a maximum overlapping area,
• wherein when the first and second sliding units slide symmetrically to a first direction from the closing position, the overlapping area between the first and second sliding units is reduced, and a sliding distance to the first direction of the first sliding unit is larger than a sliding distance to the first direction of the second sliding unit, and
• wherein when the first and second sliding units slide symmetrically to a second direction from the closing position, the overlapping area between the first and second sliding units is reduced, and a sliding distance to the second direction of the first sliding unit is smaller than a sliding distance to the second direction of the second sliding unit.