Is the LCD screen internal or external?

Internal screen
The liquid crystal display is the internal screen.
The liquid crystal display, or LCD for short, is responsible for displaying images, so it belongs to the internal screen part. Smartphone screens usually consist of two parts: the internal screen and the external screen. The internal screen, also known as the liquid crystal display, is mainly responsible for displaying images, while the external screen, also known as the touch screen or glass cover, is mainly responsible for touch functions and protects the internal screen. The liquid crystal display uses a liquid crystal solution in two polarized materials, so that when the current passes through the liquid, the crystals will rearrange to achieve the purpose of imaging. Screen leakage usually manifests as liquid-like patches or abnormal color diffusion on the display. This failure is not always caused by physical damage, but sometimes it may be caused by defects in the production process or environmental factors. In fact, screen leakage is more closely related to the internal screen. Damage to the internal screen may cause liquid-like patches or color changes to appear on the display, which may be caused by internal connector problems, backlight failure, or problems with the liquid crystal itself.