Question:

When I shine a UV light in the screen, it shows a rectangular mark inside the display

Answer:

When a UV light source is directed towards the display module, a rectangular mark might appear inside the screen due to blue light emission caused by certain materials within the display interacting with the ultraviolet (UV) light. This phenomenon is temporary and only occurs when exposed to the UV light source; it disappears once the UV light is removed. Under normal lighting conditions and typical usage circumstances, this issue does not arise, and the product's performance remains unaffected. You can continue to use the device without concern.

Terms:

UV Light - Ultraviolet Light (explained as invisible light that has higher energy than visible light)

Display Module - Part of the device responsible for displaying visual content (explained as the screen part where images and text are shown)

Blue Light Emission - Release of blue light from materials when interacting with UV light (explained as a type of visible light that appears blue and is emitted by certain materials when exposed to UV light)