A few nice led tv images I found:
Canon, Double-Bellowed, Trial 2 (result photo)
Image by dvanzuijlekom
A bit more serious experimentation; a close-up shot of my Samsung LED TV, displaying Konsole and part of my name in an IRC chat. Screen resolution is 1920×1080. Font is monospace, size 10.
You should really view this on black.
This is the setup I used to shoot this photo.