d258b0d8_ick_Overview____Bootstrike_Com__LCD
[0] Viewable screen [CRT] The viewable area is always about 0.9 - 1.1 inch smaller than the size specified on paper. This is due to the frame around the glass screen. So a 15" CRT would have only about 14" of viewable area. [LCD] 
A 15 inch LCD always has a same size of viewable area as the specifications say. Larger displays may have their viewable area reduced by at most 0.1 inches.
LCD vs CRT - Pros and Cons (A Quick Overview) - Bootstrike.Com
LCD