This is the normal thing about most of the LCD displays. There are some very
high end, high priced ones that are much better than the ones you are
probably seeing at the basic retail computer stores.
When buying an LCD screen, it is a good idea to ask about the particular
manufacture's bad pixel policy. The manufacture's policy will vary according
to the price range of the monitor.
Very good article about bad pixel policies:
http://graphics.tomshardware.com/display/20030319/
Defective Pixel Policy, From Samsung:
http://erms.samsungusa.com/customer...?PG_ID=1&AT_ID=5608&PROD_SUB_ID=28&PROD_ID=-1
The Samsung monitors are very good, but you will have to have a lot of dead
pixels in the larger monitors before they will exchange it. The other
manufactures are generally about the same.
The error that you see where the evenness of the black shading or background
is apparent, is called the "shading error" by the engineers who work in TV
design. It is possible to have black, or white shading errors. CRT's,
photographic equipment, cameras, and all displays have some shading errors.
In the high end equipment, there is a specification for this. In the
consumer end, this is very rarely published. As for the consumer LCD type
screens, the visible average that most of them have, would not be acceptable
in a CRT type set. In the LCD type panels, the shading errors are most
visible in the low grey to black regions.
All LCD screens have an apparent amount of black and extreme white clipping.
They never go right to black in their grey scale, and can have a hard type
of clipping as the peak white is reached. The higher the contrast ratio, the
less visible this type of error would be seen. CRT sets typically will
approach a contrast ratio of about 2000:1 to about 3000:1. The LCD panels
are typically about 400:1, and are now they are going up to about 700:1 (or
a bit greater) for the very expensive models.
LCD monitors are great for fine text work, and general use. They give much
less eye sore, and have no convergence errors, no purity errors, or beam
focus problems. There is no UV radiation, or X-Ray radiation. There is also
very low electromagnetic radiation as well, when compared to the best of the
CRT monitors. Unless the LCD monitor is a very expensive type that is
designed for graphics and photo work, they are not the best to work with and
edit photographs when it comes to colour and contrast adjustments.
--
Jerry G.
======
Of all the brands of LCD computer monitors I have looked
at locally, none of them display equal brightness from top
to bottom without tilting them forward and/or looking down
from several inches above the upper border.
Since not all brands of monitors are available in my area,
does anyone know of a brand where the brightness is equal
at EYE LEVEL, or where it is required to tilt it BACK (instead
of forward) for equal top to bottom brightness display?
Thanks, Chris.
