LCD screen effect (screen-door effect)

Hello all,
I’m trying to create a certain post process effect, but I need some help. I want to emulate a sort of screen-door LCD effect; the kind of effect you’d see from looking at a screen too closely.

I’m using the TV scanlines post process tutorial as a guide, but I’m not getting very far. Any advice or guidance would be great. Below are some examples:

https://t2.gstatic.com/images?q=tbn:ANd9GcRNCPukxNLWsz_7FPZ5y9EpvQnD3su3JD9dD0n-EYHr0g5yMb0L

Regards,

Ben