Elo TouchSystems ETL121K/P-6PWA-1 User Manual page 36

Appendix C : Native Resolution
As an example, a SVGA resolution LCD panel has 800 pixels horizon-
tally 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 45 column and 26 row of the input video is in
45 column and 26 row 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 in the controller. The
accuracy of the algorithms determines the fidelity of conversion of
video pixels to LCD pixels. Poor fidelity conversion can result in arti-
facts in the LCD displayed image such as varying width characters.
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