flickering

hello,
I am a complete beginner and i want to generete an animation showing blackand white stripes moving at a constant velocity in front of a grey background from one side of the screen to the other side (its for an experiment :)).
This seems so easy, but i can`t figure out how to realise a really smooth movement - it’s always flickering…
even with motion blur and 60 f/s (its a lot better then, but still flickering)!!!

Can someone help me??

Remember this is 3D so you have non-pixel based coords. Maybe you can try orthographic camera and wider stripes