240 × 320-inch screen is how much of the ah, how different the count?

240 and 320 was referring to the resolution of 240 pixels and 320 pixels each

Pixel point, there are three primary colors:red-green-blue, the color of each point is a ratio of 1:0.33 for the rectangle, and these three points together is a small square pixels

short A pixel can be seen as a very small square, so the point is there is an area the size of the size unit with centimeter of each other,

, however, a different screen, the size of the pixels will be different, Pixels and the distance between the points will be different, so the same screen resolution, there might not be the same size, it is possible is a 4-inch, and the other is a 3-inch