Specifications

Appendix C Display Issues 241
LCD Projectors LCD (Liquid Crystal Display) projectors are in many ways similar to DLP projec-
tors, and share many of the same advantages and disadvantages. Instead of
bouncing the image off a mirror, an LCD projector uses a pass-through “filter”
to modulate the light. The more analog nature of this technology means some
LCD projectors may require more adjustment than DLP projectors, and exhibit
less long-term stability.
Some LCD projectors suffer from a poor black level. The problem is often even
more noticeable on LCD projectors than on DLP projectors, and there’s a wider
span of variation due to the large number of LCD chip manufacturers. Always
make realistic tests under the expected screen size and ambient lighting condi-
tions. Use images of the kind you intend to use in the final presentation. Some
test images with white, black, saturated colors, checkerboards and gradients
are often useful too when evaluating projectors (see page 245).
LCD Display Panels Modern LCD display panels typically have very good color matching, bright-
ness and long-term stability – particularly when using a DVI cable. However,
when using multiple LCD displays to build larger display areas, bear in mind
the sometimes limited viewing angle.
Many LCD displays are designed for optimal image quality when viewed from
the front, with image quality degrading as you move off-center. Often, the
viewing angle is better when moving horizontally than when moving vertically
(as would be the case when placing multiple, landscape-oriented, LCD
displays in a column).