Elo TouchSystems ET5501L User Manual

User Manual: Interactive Digital Signage 

SW601990 Rev E, Page 15 of 36 

 

Rotate – A picture can be rotated 360° 

 

 
 
In addition to the above gestures, Optical units have the ability to pinch and zoom three different 
pictures at the same time because six simultaneous touches are supported. 

 
An LCD panels native resolution is its width and height measured in number of pixels. 
 
In almost all cases, an image displayed on an LCD monitor will look best when your computers 
output resolution matches the LCD panels native resolution. See the display specifications on 
the Elo website www.elotouch.com to find your touchmonitors native resolution. Operating in 
other resolutions will degrade video performance and is not recommended. 
 
For computer output resolutions at non-native resolutions, the monitor will scale the video to 
panel’s native resolution. For smaller input video resolutions, this involves “stretching” the input 
image in the X- and Y-dimensions to fit the panel. For larger input video resolutions, this 
involves “compressing” the input image in the X- and Y-dimensions to fit the panel. An 
unavoidable byproduct of the scaling algorithms is a loss of fidelity when the computers output 
video image is scaled by the monitor to fit the display. This loss of fidelity is most apparent when 
viewing feature-rich images at close distances (for example images containing small-font text). 

 

Your touchmonitor will likely not require video adjustments. However, for analog VGA video, 
variations in video graphic card outputs may require touchmonitor adjustments through the 
OSD to optimize the quality of the touchmonitors displayed image. To reduce the need for 
adjustments for different video mode timings, the monitor correctly scales and displays some of 
the video industries most common video timing modes.