Recently Samsung released a 5-inch low-end Galaxy Grand This model of mobile phone can be seen as a large screen product launched for the middle and low end market. It continues the big head line and reduces the configuration to control costs, so that it is easier to enter the middle and low end market. Due to the low resolution of WVGA (800 x 480), many netizens said it was unbearable. Here we can continue to see what the WVGA resolution of the five inch screen is?

Generally speaking, we often use the concept of "PPI (pixels per inch)" to measure screen graininess. PPI is the pixel per inch, also called pixel density, which describes the number of pixels per inch of the image in the horizontal and vertical directions. Therefore, the higher the PPI value, the higher the density of the display screen. Of course, the higher the display density, the higher the fidelity. PPI is the unit of image resolution. The higher the image ppi value, the richer the details of the picture, because there are more pixels per unit area. Of course, there are also P and R permutations on Samsung Amoled screens, which will also affect the visual graininess. We will not discuss them for the time being.

PPI calculation formula: the formula is expressed as PPI=√ (X2+Y2)/Z (X: length pixels; Y: width pixels; Z: Screen size)

In addition, there is also a software called "Screen PPI Calculator". As long as the screen resolution, size and other parameters are entered, the software can automatically calculate the corresponding PPI value. Taking this Samsung Galaxy Grand as an example, we calculated its PPI value as 186.59.

In addition, using the same method, we can calculate the PPI of some well-known models. The list is as follows:

From the above table, we can see that the 186.59PPI of this Samsung Galaxy Grand is basically at the same level as HTC Wildfire S and other models, and even better than the early Nokia N78/N82, iPhone 3GS and other models, but there is still a certain gap compared with the current flagship products. In addition, we should also pay attention to the problem that when people use products with larger screens, they will habitually make the products farther away from the eyes, so as to achieve better overall visual effect. The principle is the same as watching TV from a distance. Once it is pulled away, the visual perception of graininess will become smaller, which can basically reach the graininess of 200 or more PPI on the small screen. From this perspective, we can guess that the Samsung Galaxy Grand is basically similar to the visual graininess of the Nokia N8 (3.5-inch screen, 640X360, 207PPI). It should be said that it is enough for ordinary users, but for those users who are picky about the screen, undoubtedly the high resolution screen of the flagship model is a better choice.

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