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There is more to the visual quality of a display than PPI. The specific PPM answer is noted by others above (depends on viewing distance).
But, for example, a 16-shade greyscale display (with proper dithering algorithm) should appear better than a 1 bit black-and-white display. The range from blackest black to whitest white can vary (color displays will have different gamuts, different white balance, and calibration varies). Screen reflectivity can wash out the display with too much ambient light. Screen viewing angle can be narrower or wider. Screen refresh rate can be slower (E-ink is very slow but generations show improvement) or faster.
When you get to printed images you have to contend with other factors like "dot gain" (how much the ink spreads on the paper).
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