When applying the tempered film to the iPhone 7, bubbles always form in the upper left corner after a while, but they don’t appear when the film is first applied. What’s going on?

Not posted properly.

1. Tempered glass is used in many places in the home, such as doors, windows, coffee tables, shower rooms, etc. Many times when people hear tempered glass, they will think of the word "strong". As we all know, in the past, tempered glass did not have sharp corners after breaking. It was also called "safety glass". However, due to many incidents of tempered glass self-explosion, people have Understand, tempered glass is also a random missile around you!

2. Blue light is an important component of visible light. There is no separate white light in nature. Blue light is mixed with green light and yellow light to present white light. Green light and yellow light have less energy and are less irritating to the eyes. Blue light has short wavelength and high energy, and can directly penetrate the lens and reach the retina of the eye. A large amount of high-energy short-wave blue light that is harmful to the human body is retained in daily mobile phones.