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How many pixels per digit do I need for the huhman eye to be able to recognize that digit?

I need to cover a rather big area and identify ID codes. The digits are 10 cm high and maybe 8 cm wide. With the current solution I have only 34 pixels per meter, which I assume is not enough. What figures do I need to be able to do the identification?

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4  
This depends on the visual acuity of the viewer and the font being used more than anything else, I'd think. Sounds like this is on electronic signage? – Shinrai Feb 22 '11 at 16:13
2  
What distance will it be viewed from? – Tog Feb 22 '11 at 16:25

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