Cisco Systems 5.2.x manual Understand and Prevent Image Retention Burn-in, Do not use gray, 14-6

Chapter 14 Touchscreens, Projectors, and Displays

Concepts

Understand and Prevent Image Retention (Burn-in)

	After any LCD panel shows a fixed pattern for more than 12 hours, slight voltage differences can develop
	among electrodes that power the liquid crystals. Therefore, after you show a fixed image for an extended
	period of time, it might become blurred or might leave a residual image on an LCD display. This occurs
	when charged liquid crystal becomes “stuck” in one position.
	Nonetheless, image retention should not occur when you follow our recommended best practices.
Turn off your display at	• After using your display for 20 hours, turn it off for 4 hours.
regular intervals	• After using your display for 12 hours, turn it off for 2 hours.
Rotate colors and color Cycle between colors every 30 minutes.
schemes at regular
intervals
Avoid extreme	• Do not use foreground and background colors that differ greatly in their luminance.
differences in	• Do not use gray.
luminance
	• Use bright colors that are identical in their luminance or that differ only slightly in their luminance.
	• Apply motion every 30 minutes to regions that show text.
	• Apply 1 minute of motion to any region that has shown a logo for 4 hours.
Use built-in features	Tip	Some Cisco LCD models support these features while others do not. Check your Cisco LCD documentation.
to prevent image	• Use the Scroll feature to move a solid black bar up and down the display.
retention

–Set its interval in the rage from 1 to 10 hours. We recommend a 1-hour interval.

–Set its duration in the range from 1 to 5 seconds. We recommend a 5-second duration.

•Use the Pixel Shift feature to move a dotted black rectangle from top to bottom.

–Set its interval in the rage from 1 to 10 hour. We recommend a 1-hour interval.

–Set its duration in the range from 10 to 50 seconds. We recommend a 50-second duration.

•Use the Bar feature to move a black crosshair around your display.

–Set its interval in the range from 1 to 10 hours. We recommend a 1-hour interval.

–Set its duration in the range from 10 to 50 seconds. We recommend a 50-second duration.

	User Guide for Cisco Digital Media Manager 5.2.x
14-6	OL-15762-03