If your visual acuity is 20/10, you'd roughly need 3600 pixels vertically to not notice any pixelation if Bill Otto did the calculations right at https://www.quora.com/What-resolution-does-20-10-vision-corr...

20/10 is rare but can easily be corrected to with glasses or contacts.

You also left that "intended viewing distance" hanging there, without at all acknowledging what that is at a minimum?