Connection mechanism, foldable display device and communication device

An equalization control mechanism, comprising:

• a pair of fixing seats respectively located at two outermost sides;
• a pair of rotary seats respectively located at inner sides of the pair of fixing seats, each of the pair of rotary seats comprises a seat body, an arc-shaped groove provided in the seat body, and a teeth structure formed by laterally extending from a position below the arc-shaped groove of the seat body;
• a first clamping seat and a second clamping seat that are located between the pair of rotary seats;
• and
• a transmission assembly clamped between the first clamping seat and the second clamping seat,
• wherein the transmission assembly comprises:
• two first shafts, each of which is limited to a respective one of the first clamping seat and the second clamping seat at two ends;
• two first gears respectively fixed to the two first shafts;
• a second shaft passing through the first clamping seat and the arc-shaped groove of a respective one of the pair of rotary seats and being limited to one of the pair of fixing seats and the second clamping seat at two ends;
• another second shaft passing through the second clamping seat and the arc-shaped groove of the other of the pair of rotary seats and being limited to the other of the pair of fixing seats and the first clamping seat at two ends;
• and
• second gears and third gears that are fixed to the respective second shaft and respectively engaged with the respective first gear of the two first gears and the respective teeth structure,
• wherein the two rotary seats are respectively located at an outside of a diagonal of the first clamping seat and the second clamping seat, and when each of the two rotary seats rotates, the teeth structure drives the third gear, and the third gear drives the first gear to be engaged with each other and rotate together through the second shaft, such that the pair of rotary seats rotate synchronously.

A foldable display device, comprising:

• a first foldable board;
• a second foldable board;
• a back cover;
• a connection mechanism and an equalization control mechanism that connect the back cover and the first foldable board and the second foldable board;
• and
• a foldable screen fixed onto the first foldable board and the second foldable board,
• wherein the equalization control mechanism comprises:
• a pair of fixing seats respectively located at two outermost sides;
• a pair of rotary seats respectively located at inner sides of the pair of fixing seats, each of the pair of rotary seats comprises a seat body, an arc-shaped groove provided in the seat body, and a teeth structure formed by laterally extending from a position below the arc-shaped groove of the seat body;
• a first clamping seat and a second clamping seat that are located between the pair of rotary seats;
• and
• a transmission assembly clamped between the first clamping seat and the second clamping seat,
• wherein the transmission assembly comprises:
• two first shafts, each of which is limited to a respective one of the first clamping seat and the second clamping seat at two ends;
• two first gears respectively fixed to the two first shafts;
• a second shaft passing through the first clamping seat and the arc-shaped groove of a respective one of the pair of rotary seats and being limited to one of the pair of fixing seats and the second clamping seat at two ends;
• another second shaft passing through the second clamping seat and the arc-shaped groove of the other of the pair of rotary seats and being limited to the other of the pair of fixing seats and the first clamping seat at two ends;
• and
• second gears and third gears that are fixed to the respective second shaft and respectively engaged with the respective first gear of the two first gears and the respective teeth structure,
• wherein the two rotary seats are respectively located at an outside of a diagonal of the first clamping seat and the second clamping seat;
• wherein tops of the pair of fixing seats, a top of the first clamping seat and a top of the second clamping seat are fixed to the back cover, and the pair of rotary seats are respectively fixed to the first foldable board and the second foldable board;
• and
• wherein when the first foldable board and the second foldable board are folded, each of the pair of rotary seats rotates, the teeth structure drives the third gear, and the third gear drives the first gear to be engaged with each other and rotate together through the second shaft, such that the pair of rotary seats rotate synchronously.