Why does the applewatch information screen display all black?

Apple[ 1]Watch is a smart watch released by Apple in September 14. There are three different styles: AppleWatch, AppleWatchSport and AppleWatchEdition. [2]

15, 10 In March, Apple released the AppleWatch (i.e. 1 generation), which uses an artificial sapphire crystal screen and ForceTouch touch technology, and has a variety of colors to choose from. On September 15 and 10, Apple introduced several new versions of AppleWatch, including new color scheme, Hermes leather strap [3] and multicolor strap. 2065438+On September 13, 2007, Apple held the iPhone 10 anniversary conference and released the AppleWatchSeries3. [4] On September 18, 2065438+03, AppleWatchSeries4 and other products were released at Apple's autumn new product launch conference. [5]20 19 Apple launched three new iPhone and AppleWatchSeries5[6]. On September 16, 2020, AppleWatchSeries6 and AppleWatchSE were released at the 2020 Apple Autumn New Product Launch Conference.

On June 25th, 20021year, after the service was opened, you can do ECG on AppleWatch. [46-47]

On September 5th, 20021year, AppleWatchSeries7 was released at the 20021Apple Autumn New Product Launch Conference.