Blender for DLP 3D printer

I want to render with the camera so the results will be a full layer. for example, if my object is a sphare, I will get “animation” of pictures that contain full white circles from small to big and to small again.
for now I play with the clip option in the camera tab but I got only something like that (the circle is not full):

I need this sort of output for DLP 3D Printer.
In this file I have a Cube, Sphare, Camera with drivers that connect to an empty, you can change the “layer” height with empty Z axis move.
DLP projection.blend (411.4 KB)