Venetian blind structure with tiltable lower rail

A Venetian blind structure, comprising:

• an upper rail having a first accommodation;
• a lower rail arranged opposite to the upper rail and having a second accommodation;
• a plurality of slats arranged between the upper rail and the lower rail;
• at least one slat adjustment mechanism disposed in the first accommodation of the upper rail and provided with a mounting seat, a rotating shaft rotatably disposed with the mounting seat, and an adjustment unit disposed by a side of the mounting seat and operatively linked with the rotating shaft;
• at least one ladder cord unit connected with the slat adjustment mechanism, the lower rail, and the slats;
• and
• at least one pull cord unit comprising a first pull cord and a second pull cord;
• wherein the first pull cord has an end fixed to the adjustment unit of the slat adjustment mechanism, and the other end disposed with the lower rail;
• wherein the second pull cord has an end disposed with the rotating shaft of the slat adjustment mechanism, and the other end disposed with the lower rail in a way that when the second pull cord is driven by the rotating shaft of the slat adjustment mechanism, the first pull cord is driven by the adjustment unit of the slat adjustment mechanism, and the first pull cord and the second pull cord are driven asynchronously.