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14-6
User Guide for Cisco Digital Media Manager 5.2.x
OL-15762-03
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
regular intervals
•
After using your display for 20 hours, turn it off for 4 hours.
• After using your display for 12 hours, turn it off for 2 hours.
Rotate colors and color
schemes at regular
intervals
Cycle between colors every 30 minutes.
Avoid extreme
differences in
luminance
•
Do not use foreground and background colors that differ greatly in their luminance.
• Do not use gray.
• 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
to prevent image
retention
Tip Some Cisco LCD models support these features while others do not. Check your Cisco LCD documentation.
• Use the Scroll feature to move a solid black bar up and down the display.
–
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.