Elo TouchSystems ET1229L Series User Manual page 45

As an example, a SVGA resolution LCD panel has 800 pixels horizontally by
600 pixels vertically. Input video is also represented by the same terms. XGA
input video has a format of 1024 pixels horizontally by 768 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 or higher 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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