Form converting mechanism and display apparatus

A form converting mechanism, configured for connecting to a back side of a flexible screen body, comprising:

• a first connecting member;
• a second connecting member;
• a third connecting member;
• and
• a fourth connecting member;
• wherein the first connecting member, the second connecting member, the third connecting member and the fourth connecting member are connected in sequence;
• the first connecting member comprises a first outer end configured to be connected to one side end of the flexible screen body, a first pivotal portion and a first inner end;
• the second connecting member comprises a second outer end configured to be connected to the other side end of the flexible screen body, a second pivotal portion and a second inner end;
• and
• two ends of the third connecting member are respectively pivoted with the first pivotal portion and the second pivotal portion, and two ends of the fourth connecting member are respectively connected to the first inner end and the second inner end;
• at least one of the first connecting member, the second connecting member, the third connecting member and the fourth connecting member is configured to withstand an external force to change a distance from the first outer end to the second outer end.