Specifications

Appendix C Display Issues 239
C
DISPLAY ISSUES C
WATCHOUT can be used with most display technologies, including DLP and
LCD projectors, LCD monitors, LED walls, video wall cubes and plasma
screens. Generally, you can use any display device that’s compatible with the
display card in the display computer.
Avoid mixing brands and models of displays on adjacent or overlapping
areas, since they most likely will differ in their image reproduction. As the light
intensity and color temperature of many projectors may degrade over time, try
to use projectors that have been in use roughly the same number of hours.
DISPLAY TECHNOLOGIES The following sections provide an overview of display technologies, with
special emphasis on aspects related to WATCHOUT.
DLP Projectors DLP (Digital Light Processor) uses a microscopic mirror chip to modulate the
light (see http://www.dlp.com/). This display technology has the advantage
of being 100% digital, resulting in excellent, long-term image stability and reli-
ability – particularly when using a digital computer connection, such as DVI
(see “DVI Connector” on page 242).
An issue with some DLP projectors is the lack of true black. The poor black level
produced by some projectors often results in gray banding in overlapping
image areas. This is particularly noticeable in a totally dark room, and,
conversely, is less of an issue in installations at, for example, a shopping mall,
a trade-show or similar environment. This problem is magnified when using