Pixel Density Explained
Most LCD and LED monitors currently display at standard HD resolution, commonly referred to as 1080p. Without getting too much into the technical aspects, this is the same resolution as a standard, high-definition television (HDTV). What's important to understand is that this pixel resolution -- 1920 pixels wide by 1080 pixels high -- is the same regardless of the size of the screen. So whether you buy a 21", 23" or 27" display, if they are HD displays, you're seeing the same number of pixels. The larger the screen, the lower the pixel density and the more obvious the pixels appear.