Kontron FlexPAC, Manual

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Flat-Panel Display Characteristics
The display screen in your product may exhibit one or more dots that are
always lit (on) or are always dark (off). This dot can look like a tiny pin hole
in the screen. If your display does have a nonfunctional dot, it is not usually
noticeable when the screen is viewed from a normal distance but may appear
if the dots surrounding it are of a contrasting color, for example a white dot on
a field of black. This is considered a normal occurrence for Active Matrix-Liquid
Crystal Display (AM-LCD) technology and does not signal impending
failure of your screen.
Active Matrix Liquid Crystal Displays are highly complex electronic
components that are under a constant state of improvement and refinement.
The technology that allows these AM-LCDs to be manufactured is very
advanced but does not, however, always produce 100% perfect displays.
Unfortunately, cost-effective, visually perfect displays are virtually impossible
to attain at this point in the technology timeline. Consequently, a balance has
to be made between a requirement for “cost-effective, visually perfect”
screens and the manufacturer’s actual ability to produce a product of “near
perfect” quality at a reasonable price. This has driven the AM-LCD
manufacturers to write detailed specification documents defining what the
difference is between a screen of acceptable quality and one of unacceptable
quality. These documents contain detailed technical analyses and often are
intended to help define that balance between perfection and price.
A normal AM-LCD panel may contain between 15 (for VGA) and 30 (for
SXGA) non-functional dots on the screen. In VGA resolution, this is less than
.0016% of 921,600 dots (subpixels) that make up a screen of 640 pixels
horizontal x 480 pixels vertical x 3 subpixels (one subpixel each for red, green
and blue). For a SXGA screen, with 30 non-functional subpixels, this would
represent .00076% of 3,932,160 subpixels.
To minimize the possibility of ANY non-functional subpixels, Kontron only
uses the highest quality display screens from name brand manufacturers.
Working closely with these major AM-LCD manufacturers insures the highest
quality AM-LCD screens possible. All display screens are tested for
conformance to the specifications of their manufacturer and are certified to
be within those specifications. Should you have questions pertaining to the
exact display screen specifications in your product, please contact Kontron
technical support at 1.800.995.7579.
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Appendix
A.10