Sharp DV-L70U 7" Portable DVD Player
Not a review
Are you sure that a 5 inch diagonal screen is 25 square inches and a 7 inch diagonal screen is 49 square inches? I don't think that you can get the square inches by squaring the diagonal. In fact, in the technical info  for this product it says that it is 3.47 by 6.0125 inches. By my  calculations (wow, that sounded dorky) the screen is 20.863375 square  inches. I'm not sure what the dimentions for the other one is, but if you  want to figure it out, go ahead. The ratio is either 4:3 or 16:9, and the  diagonal dimention is approximatly 5 inches.