Elo TouchSystems 1938L User Manual page 23

As an example, a WXGA+ resolution LCD panel has 1440 pixels horizontally by 900 pixels
vertically. Input video is also represented by the same terms. WXGA input video has a format of
1440 pixels horizontally by 900 pixels vertically. When the input pixels contained in the video
input format match the native resolution of the panel, there is a one to one correspondence of
mapping of input video pixels to LCD pixels. As an example, the pixel in column 45 and row 26
of the input video is in column 45 and row 26 of the LCD. For the case when the input video is at
a lower resolution than the native resolution of the LCD, the direct correspondence between the
video pixels and the LCD pixels is lost. The LCD controller can compute the correspondence
between video pixels and LCD pixels using algorithms contained on its controller. The accuracy
of the algorithms determines the fidelity of conversion of video pixels to LCD pixels. Poor
fidelity conversion can result in artifacts in the LCD displayed image such as varying width
characters.
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