Intercharacter spacing in OpenOffice

I've noticed that the intercharacter spacing of OpenOffice documents is not calculated correctly for the on-screen display, even though it is OK in the printed documents. A specific case in point is the display of Times New Roman. Antialiasing appears to be on, since when I temporarily turned it off the characters themselves looked pretty bad. The font help at OpenOffice.org has nothing that I can find on this issue. Any suggestions? Paul