The mark on your LCD screen is likely caused by a phenomenon called image retention. Image retention occurs when the same image is displayed on the screen for a long period of time, causing the liquid crystals in the display to become stuck in their current position. This can result in a faint shadow of the image being visible on the screen, even when a new image is displayed.

Image retention is more likely to occur on LCD screens than OLED screens because OLED screens do not use liquid crystals. Instead, OLED screens use organic light-emitting diodes, which are more resistant to image retention.

There are a few things you can do to reduce the risk of image retention on your LCD screen:

* Avoid displaying the same image for a long period of time.
* Use a screensaver when your computer is not in use.
* Adjust the brightness and contrast of your screen to a comfortable level.
* Do not apply pressure to the screen.

If you do notice image retention on your LCD screen, there are a few things you can try to fix it:

* Power off your computer and then back on again.
* Use a screen cleaner to clean the screen.
* Apply pressure to the screen in the area of the image retention.
* Contact the manufacturer of your computer for assistance.

It is important to note that image retention is not permanent. In most cases, it will eventually go away on its own. However, if the image retention is severe or does not go away on its own, you may need to replace your LCD screen.
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