This display: measuring refresh…

Flicker / banding comes from a shutter × refresh mismatch. Match shutter to a clean fraction — try 1/50 or 1/100 in 50 Hz regions, 1/60 or 1/120 in 60 Hz. If bands roll, nudge the shutter angle until they settle.

Moiré is the sensor grid beating against the pixel grid — not fixable with shutter. Defocus slightly, change focal length / distance, or angle the screen a few degrees.

Keying: keep the surface evenly lit and not blown out — a dimmer, saturated fill keys better than a bright one that spills. When green spill is a problem, use a darker fill (Black / 18% Grey) with fluoro marks.