Do plasma screens emit IR radiation?
Yes. “A recent patent filing from Sony will be welcomed by puzzled people whose remote-controlled audio and video players mysteriously go haywire when their plasma TV screen is switched on. A plasma screen produces an image by discharging high voltages through an inert gas, which then emits ultra-violet light to excite coloured phosphors. However, a patent from Sony suggests that plasma screens also emit infrared light at frequencies that can interfere with remote controls. According to the patent, the infrared signals produced by plasma screens have wavelengths between 825 nanometres and 880 nanometres, while most remotes operated at 875 nanometres and above. So a filter that blocks plasma-generated frequencies but lets infrared over 900nm through should block out unwanted signals while allowing normal remotes to work.
