Cat eyes have a different refresh rate than human eyes. Some cats can see monitors just clearly enough to make out what's on the screen. Others see flicker. The color gamut is different too.
I can see this being a thing with CRTs (which basically 'flicker' constantly), but LCDs?
Some LCD displays use flicker to set backlight LED brightness.
Dang, TIL, I guess... but I don't see how that relates to the OPs hypothetis about cat vision. A phrase I never thought I'd be uttering here, or... anywhere, really.