21
APPENDIX
A
N
ATIVE
R
ESOLUTION
The native resolution of a monitor is the resolution level at which the LCD panel is
designed to perform best. For the TouchSystems LCD touchmonitor, the native resolution
is 1024 x 768 for the 15.0 inch size, 1280x1024 for the 17/19 inch size, and 1680x1050
for the 22 inch size. In almost all cases, screen images look best when viewed at their
native resolution. You can lower the resolution setting of a monitor but not increase it.
For exmple:
Input Video
15.0" LCD
640x480 (VGA)
Transforms input format to 1024x768
800x600 (SVGA)
Transforms input format to 1024x768
1024x768(XGA)
Monitor in Native Resolution
The native resolution of an LCD is the actual number of pixels horizontally in the LCD
by the number of pixels vertically in the LCD. LCD resolution is usually represented by
the following symbols:
VGA 640x480
SVGA 800x600
XGA 1024x768
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.
