Rotating shaft apparatus, support system, and foldable-screen device

A rotating shaft apparatus, comprising:

• a first primary support member, having a first support surface, wherein the first support surface is configured to support a part of a foldable screen;
• a second primary support member, having a second support surface, wherein the second support surface is configured to support a part of the foldable screen, and the second primary support member can rotate relative to the first primary support member between an unfolded location and a folded location;
• a first secondary support member, comprising a first connection part and a first cantilever part that are fixedly connected, wherein the first connection part is located on a side facing the first support surface and is connected to the first primary support member, the first cantilever part comprises a first cantilever segment, the first cantilever segment is located on a side facing the second support surface, and when the second primary support member rotates relative to the first primary support member between the unfolded location and the folded location, at least a part of the first cantilever segment slides relative to the second primary support member;
• and
• a lubrication structure, disposed at least between the at least a part of the first cantilever segment and the second primary support member.

A foldable-screen device, comprising:

• a foldable screen, a first housing, a second housing and a rotating shaft apparatus;
• the rotating shaft apparatus is connected between the first housing and the second housing;
• the foldable screen comprises a first display region, a second display region, and a third display region, the third display region is connected between the first display region and the second display region, the first display region is disposed on the first housing, the second display region is disposed on the second housing, and the third display region is disposed on the rotating shaft apparatus;
• the rotating shaft apparatus comprises a first primary support member, a second primary support member, a first secondary support member and a lubrication structure;
• the first primary support member has a first support surface, wherein the first support surface is configured to support a part of the foldable screen;
• the second primary support member has a second support surface, wherein the second support surface is configured to support a part of the foldable screen, and the second primary support member can rotate relative to the first primary support member between an unfolded location and a folded location;
• the first secondary support member comprises a first connection part and a first cantilever part that are fixedly connected, wherein the first connection part is located on a side facing the second support surface and is connected to the second primary support member, the first cantilever part comprises a first cantilever segment, the first cantilever segment is located on a side facing the first support surface, and when the second primary support member rotates relative to the first primary support member between the unfolded location and the folded location, at least a part of the first cantilever segment slides relative to the first primary support member;
• and
• the lubrication structure is disposed at least between the at least a part of the first cantilever segment and the first primary support member.