Displacement not take into account trancarency or/and backface culling

[larex39]

A want to do appearing effect with object which have also displacement. When i conneced mask to opacity, the render looks good. But when I turn on displacement via modifier or via matterial I can everytime see displacement from back of the object even i have turn on force back face culling and even the transparenci not showing back face polygon.
Can you please fix it. Now it is realy problematic to do effect stuff like this

Thaks a lot

Alex.