Extron Electronics IN1508 User Guide - Manual (Page 44)

Selecting the Optimum Resolution and Refresh Rate for Fixed Pixel Displays
Display devices that are based on LCD, DLP, D-ILA, and plasma technology have a specific
number of pixels, a native resolution. These displays typically can show higher or lower
resolution signals, but can do so only by scaling the image up or down to the native
resolution. To avoid additional image scaling by the display (and more processing is
inherently bad for image quality), it is important to know the native resolution of your
display.
Check the operation manual for the display to determine its native resolution. Set the
switcher to match this native resolution. The refresh rate of the switcher should be set to
60 Hz for most LCD, plasma, D-ILA, and DLP projectors.
NOTE: Higher refresh rates are not recommended for these display technologies. They
usually do not improve the image and may cause compatibility problems.
For best results:
1. Set the output resolution and refresh rate of the switcher to match the native resolution
of your display.
2. Output the White Field test pattern and then execute the auto image function of your
display (this function may be called auto adjust or auto setup).
3. Output the Alternating Pixels test pattern and use the clocking or total pixels adjustment
of your display to eliminate any vertical bars in the display.
4. While still outputting the Alternating Pixels test pattern, use the fine sync or phase
adjustment of your display to eliminate any remaining noise.
5. Output the Crop test pattern and use the centering of shift controls of your display to
center the image so that all four sides of the crop lines are visible.
6. Turn the test patterns off.
IN1508 • Operation 39