Pressure marks on a laptop screen are caused by an object, usually a finger, pressing into the screen. When the LCD screen of the laptop is pressed the colours are altered. This can cause permanent damage to the screen and result in discolourations or pressure marks. There is no best solution for repairing pressure marks other than replacing the monitor.
When pressure is applied to the LCD screen, the liquid crystals in the display are damaged. The order of the crystal matrix is distorted. As a result the liquid crystals are skewed and retain a false colour or lose the ability to generate any light. The amount of pressure and how long it is applied for determine what will happen to the display.
Dead pixels that are caused by pressure marks can be repaired depending on the type of damage. Turn off the computer. Use a damp wash to apply pressure to the area of the dead pixels. Turn on the computer. Release the pressure. This works because the liquid in the display is kept from spreading to each pixel.
While fingers are the most common cause of pressure marks, they can also be caused in other ways. Laptops that have damaged bumpers can also cause problems. Bumpers are the grooves on the laptop that prevent the screen from touching the keyboard when it is closed. If the bumpers are damaged, the screen may come into contact with the keyboard. This can result in damage. If the laptop is packed tightly in a bag for travel, the pressure on the screen by other objects can cause pressure marks.
Unfortunately, pressure marks on a monitor are very hard to repair. The cost of doing so is not worth it because replacement monitors are significantly cheaper. Fortunately, the cost of LCD replacement monitors has gone down and a replacement screen can easily be purchased inexpensively for most laptops.