Hi Susan,
A study I'm aware of is mentioned at this web site, but it doesn't mention flat-panel monitors specifically. I'd suggest getting in touch with them directly about the status of this work.
http://www.napa.ufl.edu/98news/tvwaste.htm
Alice I. Chapman, PE
King County Hazardous Waste
130 Nickerson St, Suite 100
Seattle, WA 98109-1658
206-263-3058 (ph)
206-263-3070 (fax)
http://www.metrokc.gov/hazwaste