Subject: | |
From: | |
Reply To: | |
Date: | Tue, 13 Apr 2010 11:07:57 -0600 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
>I'm wondering if other video projector users have had yellow spots
>develop in their images over time. We've particularly had problems
>with Sony projectors, including two of the VPL-FE40 units in our SoS
>installation and an older VPL-PX40 we took out of service a few
>years ago because of the spots. (We don't have experience with any
>other brands, so I don't know if they have similar problems.)
I've seen it as a problem with LCD projectors, never with DLP
projectors. We usually see it as a blue haze forming around the
periphery of the projected image which eventually spreads across the
entire image like a cataract (primarily with Viewsonic projectors
(PJ1172, which are really rebranded hitachis)).
I have the unique case of being at higher altitude than most other
people (we're about a mile above sea level) and I think the
underlying issue is one of heat. At altitude, we just have less air
to move around to cool off the projectors (and lower end projectors
don't have a secret altitude setting in firmware). Every LCD
projector I've used eventually has problems with the screen closest
to the heat source in the projector. The problem is definitely
compounded if the projectors are being used outside of the
recommended angles and positioning of the manufacturer.
I've talked with Sony, Hitachi, and Panasonic reps and I've never had
a consistent answer so the above is a bit of conjecture. But, for
stuff that we're using in exhibits and where airflow may be a
potential issue, we're using DLP projectors exclusively.
-bw.
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Bruce Wyman, Director of Technology
Denver Art Museum / 100 W 14th Ave. Pkwy, Denver, CO 80204
office: 720.913.0159 / fax: 720.913.0002
<[log in to unmask]>
***********************************************************************
For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
http://www.lsoft.com/LISTSERV-powered.html.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]
|
|
|