we calculated whether or Apple's official 330 326

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Apple iPhone 4
Official Apple iPhone 4-screen rendering
Sharp 904SH
Sharp 904SH
Sharp 904SH
There may be a lot of friends do not understand how to calculate them, the following I explain to a simple calculation of PPI. First, let's look at what is PPI,[link widoczny dla zalogowanych], PPI Pixels per inch is the English acronym, meaning that the pixels per inch have (Pixel) the number of the PPI figure out what that means, we can easily understand the calculation of PPI , we need to first calculate the equivalent pixel diagonal screen mobile phone, and then impose a diagonal (we usually say mobile phone screen size means that the length of the diagonal), you can get a PPI. Accurate calculation of publicity we can refer to the figure below. More interesting is that the formula calculated based on the PPI for the iPhone 4 330 326 official than Apple a little bit higher.
I believe we looked at the formula above should be clear how to calculate the phone's PPI of the bar. Sharp 904SH launched in 2006 we can calculate this formula, the final PPI data obtained as 333.3333, we calculated whether or Apple's official 330 326, Sharp 904SH all win in iPhone 4, and the aircraft was 06 introduced models. In fact, according to statistics a little early to edit the screen resolution at 3 inches FWVGA (854 * 480 pixels) of the phone about PPI calculated in 326.55,[link widoczny dla zalogowanych], with the iPhone 4 less, according to Apple's official statement, or even stronger.
Find additional memory by editing found in the 3-inch screen resolution FWVGA (854 * 480 pixels) mobile phones are Japanese,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], but also many, and many have been released for some time, but also recently introduced a new machine. Sony Premier3,the law can only apply for public facilities, Sharp 935SH, SH-05A, SH-05B,[link widoczny dla zalogowanych], Fujitsu F-03B, NEC N-04A, Sony Ericsson iida G9, Sharp SH001, Fujitsu F-10B and other mobile phones are based on the configuration, in other words the phone screen with finesse of about iPhone 4.
Although there are so many great screen phone, but these phones are only sold in Japan, but Sharp was introduced in 2009, when Sharp had a model SH1810C of the licensed mobile phones, the machine parameter is the 3-inch large screen resolution To FWVGA (854 * 480 pixels), which is now licensed in the domestic market, the author could find only a PPI index to compete with the iPhone 4 models.
Sharp SH1810C
Of course, PPI is an index only, by the formula we can see that the screen is relatively small, the resolution will be relatively large phone PPI high, this is just a numbers game only, we do not need seriously. Overall, Apple's iPhone 4 really is a perfect phone, not the purpose of writing this article is to criticize Apple,[link widoczny dla zalogowanych], but to make you a better understanding of our mobile phones, are interested, you can calculate their own cell phone PPI.