why does the PIP look so good?

When I click up the cable guide and the current channel is compressed
into a little PIP window, less than 1/4 of a 1366x768 (LCD) screen,
the PIP image looks extraordinarily clear!  Anyone else notice that?

Seems to suggest that viewing digital/HD images on even a 640x
physical display, whatever that comes to, about 12", might be a nice
secondary TV - if they can sell it for about $200.

J.