a 4 inch screen was the largest which could be used for a easily hand held device: the size of a credit card: 85.60 × 53.98 mm (standardised as the ID-1 format). Following this approach the size for a larger, but still pocket size tablet computer would be the B7 size used for passports (ID-3 125 × 88 mm or 4.921 × 3.465 in).This would provide a 6 inch diagonal screen, assuming the screen went to the edge of the device.
It should be noted that B7 is approximately 4:3 ratio, which is squarer than the format used by many of the smart phones and tablet computers. The wider screens are useful for watching HDTV (16:9 format), but 4:3 is better for most information displays.
This suggests that the numerious 7 inch tablet computers are too large. But also devices such as the Dell Streak 5 smartphone/tablet PC with a 5 inch screen (5:3 aspect ratio) with a case (case: 152.9 × 79.1 mm or 6.02 x 3.11 inches) are not quite right either.
It should be noted that B7 is approximately 4:3 ratio, which is squarer than the format used by many of the smart phones and tablet computers. The wider screens are useful for watching HDTV (16:9 format), but 4:3 is better for most information displays.
This suggests that the numerious 7 inch tablet computers are too large. But also devices such as the Dell Streak 5 smartphone/tablet PC with a 5 inch screen (5:3 aspect ratio) with a case (case: 152.9 × 79.1 mm or 6.02 x 3.11 inches) are not quite right either.
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