11/01   Besides the obvious; are there any differences between a 19 inch LCD
        flat panel and the 20/21 inch?  Why is there such a price
        difference?
        \_ 19" displays (widescreen) are generally 1440x900, while most 20"
           and 21" displays are 1680x1050.
           and 21" displays (widescreen) are 1680x1050.
        \_ PP is oversimplifying a little.  Standard 19" are 1280x1024 (5:4
           aspect ratio)  Standard 20 and 21" are 1600x1200.  Wide aspect
           screens as PP said.  The price difference is for a few reasons:
           Larger is more desirable, more pixel elements which could go bad,
           needs a larger area of the wafer, more complex control electronics,
           smaller pixels are more vulnerable to defects, need a larger area
           to be relatively free of defects, etc...
           If you don't care so much about resolution, 19" is the obvious
           choice, but if you really do care about resolution, 20" often has
           a better $/pixel cost.
           \_ Then how come the difference between 17" and 19" is not as big?
              --- !OP
             \_ Because most 17", 18.1", and 19" have the same resolution,
                1280x1024 5:4.  Pixels are smaller on smaller screens, but
                that's about it.
                \_ I see.  17" needs a smaller wafer which is less likely to be
                   bad, but the pixels are smaller which is more likely to be
                   bad.  So they compensate each other.
        \_ This is not a difference in the panels, but not all video cards
           can drive the larger resulutions properly.