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  • Should displays have more PPIs?

    Kaustubh Katdare

    Kaustubh Katdare

    @thebigk
    Updated: Oct 26, 2024
    Views: 1.7K
    I've began wondering if pixels per inch (PPI) is a marketing gimmick to make people believe that they're buying a super great looking display. It's definitely an engineering achievement to fit 500+ pixels per inch of the display; but I think that already surpasses the limit of the human eye. You simply cannot distinguish between displays that have more pixels.

    Plus, the important issue is that unnecessary battery power is consumed to power these pixels reducing the overall actual usage time. On the other hand, I've been reading comments that the 4K displays are must for the VR GEAR - the virtual reality headset that Samsung develops to work with the latest phones.

    What do our fellow engineers think about displays with more PPIs?
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  • Ramani Aswath

    Member • May 7, 2015

    If I may borrow from my work with film photography, at small magnifications it does not matter. At the distance of normal vision the human eyes resolving power is 0.1mm. That is, two spots are sen as separate provided there is a 0.1mm distance between them. Below that they are seen as one spot. So we are talking of 250 PPI. 500 PPI should do alright for normal purposes. However we were using very slow speed, very high resolution films for some spectral work, where lines were very close and could be seen only at high magnification. In such cases a high PPI is justified. In the end, it seems to come down to " Horses for courses".
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