What on earth are you talking about. The human has a maximum acuity of about 0.4 arcminute per line-pair or about 300ppi for a device held at 10-12" away. The theoretical maximum which can't really be achieved is ~860ppi at 4" distance which no one can focus that closely.
For a desktop monitor of about DCI 8K resolution in 32" size, would get you to the limit of human acuity at 12".
With a pixel density of over 25,000 PPI, the newly developed Retina E-Paper reaches the resolution limit of human vision. Its color display works without an internal light source, relying instead on electrochromic nanopixels that reflect ambient light.
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