Why does my UIScreen and UIWindow size not match?

I want to download a picture from the server and set it as fullscreen for the iphone4s, i use UIScreen *mainScreen = [UIScreen mainScreen]; and use this mainscreen to get the size (it's 960x640). When the app launches, I insert the code to AppDelegate .

if (im!=nil){
    UIImageView *splashScreen = [[UIImageView alloc] initWithImage:im];
    [self.window addSubview:splashScreen];
    [UIView animateWithDuration:3 animations:^{splashScreen.alpha = 0.99;}
                     completion:(void (^)(BOOL)) ^{
                         [splashScreen removeFromSuperview];

I noticed the size is incorrect, then I logged out the size of the self.window and found the size of the window is 320x480. How did this happen?

Here is how i get the sizes:

UIScreen *mainScreen = [UIScreen mainScreen];
UIScreenMode *ScreenMode = [mainScreen currentMode];
CGSize size = [ScreenMode size];
CGFloat screenWidth = size.width;
CGFloat screenHeight = size.height;


That's the difference between points and pixels.

The UIScreen returns the size in pixels, however UIKit deals with points. Here's some Apple documentation on the subject: https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/WindowsandViews/WindowsandViews.html#//apple_ref/doc/uid/TP40009503-CH2-SW15

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