All electronics heat up,but its more in a plasma then lcds.
Lcd are all passively cooled these days,where as plasmas still need active cooling.
The plasma heat rises with the increase in amount of white or light color shade.When the screen is showing a bright white color this is when the plasmas heat and power consumption are at their highest.Some plasmas manufactures restrict the tvs brightness capability or let the tv decrease in brightness as the APL(average picture level) increases.
The tv calculates the APL level which in turn controls the ABL(automatic brightness limiter) which decreases the brightness.
Lcd are all passively cooled these days,where as plasmas still need active cooling.
The plasma heat rises with the increase in amount of white or light color shade.When the screen is showing a bright white color this is when the plasmas heat and power consumption are at their highest.Some plasmas manufactures restrict the tvs brightness capability or let the tv decrease in brightness as the APL(average picture level) increases.
The tv calculates the APL level which in turn controls the ABL(automatic brightness limiter) which decreases the brightness.