In message , at 06:49:15 on Sun, 8 Mar
2015, john james remarked:

The TV programme thing is also related to being able to filter out a
pattern where the power consumption of the TV varies with the
brightness of the picture,

I'm not convinced that it does anymore with modern TVs.

http://www.trustedreviews.com/opinio...ur-hdtv_Page-4

...the dynamic contrast feature carried by most LCD and a few
plasma TVs. The idea behind these is that the TV continually
assesses the content of the picture you're watching, to see how
bright or dark a shot is. And if it detects that a shot is
predominantly dark, it will reduce the TV's light output in a
bid to make blacks look less grey. Then, when it detects a scene
that's brighter, it will up the light output again to give this
scene more intensity.
--
Roland Perry