Visual area - LCD liquid crystal display
Visual area is refers to in the practical application, which can be used to display images that part of the area of the screen.Because the CRT display of nominal size is actually the size of the picture tube, which can be used to display images of some fundamental reach this size, because the border around the tube accounts for part of the space.17 inch CRT display, in general, visual area of about 15.8-16 inches, and 15-inch monitor visual area is only 13.8 inches, this value depends on the manufacturer.But for the LCD, the size of the nominal size is basically the size of the visible area, is occupied by a margin of space is very small, 15 inch LCD viewing area is about 14.9 inches, which is why the LCD looks more bigger than the same size CRT.So when are you going to the CRT display to upgrade to the LCD, can choose the nominal area of smaller liquid crystal display (for example, you use 19 "CRT monitor, upgrade when choose 17" LCD display is ok).


Distance - LCD liquid crystal display
LCD screen is composed of many pixels, and each pixel is composed of three red, green and blue phosphor, because pixels and the pixels are next to each other, so the neighboring pixels in the same color of the distance is the distance between the phosphor.The smaller the distance, display image is more clear and sharp, because can accommodate more pixels in the same area.Although theoretically distance as small as possible, but since there are several ways of measurement point is at the same time, we can not only from the point of numerical value to judge the quality of LCD.And point distance and pixel geometry, the original resolution also to have certain relations.

In most cases, the distance is in accordance with the oblique diagonal measurement, it is also a point away from the performance of the most accurate method.Then some vendors introduces horizontal distance measurement method, but this case did not show the points on the vertical distance, so some cheap inferior LCDS tend to also can achieve better value.
For example, a diagonal distance of 0.28 mm of liquid crystal displays, usually the horizontal distance of 0.24 or 0.24 mm.Relatively high-end display of diagonal distance of 0.26 mm, the horizontal distance can reach 0.22 mm.
 
So everybody when buying liquid crystal display, must figure out the distance is a diagonal or nominal level.Distance of 0.26 mm LCD may be better than 0.24 mm LCD display effect.