Samsung 400TS-3 - Manual (Page 135)

You can set the timer for Screen Burn Protection.
If you start the operation to erase any residual image, the operation will be performed for the set period
of time and then automatically finish.
• Off
• On
Mode
You can change the Safety Screen Type.
• Bar
• Eraser
• Pixel
Period
Use this function to set the execution period for each mode set in the timer.
Time
Within the set period of time specify a time for execution.
Adjusting the LCD Display