I found the ONIX dimensions ...:

ONIX 10 - Diagonal 10.4"
8.50"(h) x 6.375"(v) = 54.187 sq. in
1024(h) x 768(v) = 786,432 pixels
786,432 / 54.187 =
14,513 pixels/square inch
-----

ONIX 8 - Diagonal 8.4"
6.75"(h) x 5.0"(v) = 33.75 sq. in
1024(h) x 768(v) = 786,432 pixels
786,432 / 33.75 = 23,301 pixels/square inch

I will add the HELIX 12 when we get verification of actual screen dimensions (I'm sure kosmo is close) ...

Rickie