Why does the current stop at pinch voltage in a JFET?

[nhrock3]

i thought that as we increase the voltage the gap becomes smaller
and in pinch voltage we have an open circuit

but the grath says otherwise
that as we increase the voltage the current increases and in the pinch voltage (when there is no way for the electrons to move and we have a total deplition region on one side)
we have a saturation
and there is no decrease in current no where
why?

 

[nhrock3]

in here
http://www.learnabout-electronics.org/fet_03.php
when i increase the Vdc the current stop
no matter what in the Vgs