Display panel and data processing device

A device comprising:

• a first board;
• a first hinge physically connected to the first board;
• a connection portion;
• a second hinge;
• and
• a second board physically connected to the second hinge,
• wherein the first hinge and the second hinge are physically connected to each other via the connection portion,
• wherein each of the first hinge and the second hinge comprises:
• a first link comprising a first joint-pin;
• a second link comprising a second joint-pin;
• and
• a first hook comprising a plurality of holding positions comprising a first holding position and a second holding position, and
• wherein in each of the first hinge and the second hinge:
• the first hook is configured:
• to be fixed to the first link with the first joint-pin so as to allow the first hook to rotate;
• and
• to be connected to the second link by fixing the second joint-pin at any one of the plurality of holding positions;
• the first holding position is a drop portion provided on an outer edge of the first hook;
• and
• the second holding position is an inflection point with an obtuse angle provided on the outer edge of the first hook.