I have had similar experience. Not experimenting with LCD's themselves, but testing products with LCD's. Most of the ones that I have experience with have a metal back plate. It seems that it's important to bond this plate peripherally to your casework shielding. That keeps the circuits behind the display from radiating around it. It doesn't seem as though the displays themselves (in my limited experience) cause much trouble at all, even with Class B stuff.
We once experimented with ITO (Indium Tin Oxide) coatings on the display window to see if it would lower emissions. It didn't, but it did increase cost. We bagged it. As a side comment, it seems like ITO is conductive enough for static dissipation, but not for shielding. So, if you ever did need to shield an LCD, you would probably be limited to windows that use metallic mesh sandwiches. Chris Maxwell Design Engineer - NetTest Optical Division email [email protected] phone +1 315 266 5128 fax +1 315 797 8024 NetTest 6 Rhoads Drive, Utica, NY 13502 USA web www.nettest.com > -----Original Message----- > From: [email protected] [SMTP:[email protected]] > Sent: Friday, June 29, 2001 7:02 AM > To: [email protected]; [email protected] > Subject: Re: LCD Monitors etc. > > > George, > > I did a number of experiments on 15" monitors for a machine HMI. They are > indeed quiet, but there is quite a difference between manufacturers..... > > Most of the problems I had to fix were related to leakage through the > display > from circuitry behind it. > > Derek. > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: [email protected] > Dave Heald [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
