Posted by Jan B on 11/16/69 11:41

On Fri, 03 Mar 2006 02:29:00 GMT, "z" <z@y.x.invalid> wrote:

>I am looking for a plasma hdtv for a room.
>The room is approx. 165" x 230" (13.5' x 19.2')
>
>On one wide wall is a picture window, centered; on the opposite
>wide wall is a double pocket door, 6' wide, slightly off center.
>On the other two sides are one conventional window each, ...
<snip>

My points of view:
1) When considering a display type with sharp pixels, like plasma or
direct view LCD, you should consider the pixel size and the viewing
distance. Close enough, with pixels not small enough you begin to
resolve the pixels and the picture is not smooth and natural.
The rule of thumb is that normal persons can resolve one arcminute.
You don't want to do that, and my own tests with my (smaller) LCD
panel gives me a closest viewing distance of around 4 meter per
millimeter pixel size.

For example a 50" panel with 768 vertical pixels gives a pixel size
about 0.8mm and my formula results in about 11' distance. (I haven't
checked with a large panel but it should be scalable.)

The same type of consideration is valid also for projection types but
since these will/can blur the pixels somewhat you can get away with a
shorter viewing distance (at least based on this effect).


2) Reflections in one of the "high gloss" types of panels from bright
objects will ruin a good picture. It can ruin any good black level
from the panel and I prefer the "matt surface" type of LCD panels
because they are not as sensitive to reflections. Again, I haven't
checked the really large LCD panels that potentially have more
problems with pixel response time and black level.

/Jan

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