Question:

Why does a rectangular mark appear on the screen when I shine a UV light on it?

Answer:

When a UV (ultraviolet) light source is directed towards the display module, a rectangular mark may appear on the screen.

This occurs due to the blue light emission produced by certain materials within the display interacting with the UV light source.

The rectangular mark is a temporary effect caused by the UV light and will disappear once the light is removed from the screen.

This phenomenon does not occur under normal lighting conditions or typical usage scenarios.

It does not indicate any issue with the product's performance or functionality.

You can continue to use the device confidently without any concerns regarding this matter.

Terms:

UV (Ultraviolet): A type of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays.

Display Module: The part of an electronic device responsible for displaying visual output, typically consisting of a flat panel screen.