sony bravia hdtv 120hz
Sony - BRAVIA XBR Class / 1080p / 120Hz / LCD HDTV?
I have a Sony - BRAVIA XBR Class / 1080p / 120Hz / LCD HDTV.
Everytime when I'm watching a movie and when the movie goes dark, the screen goes dark, too. How can I adjust this problem?
Thanks
The short answer is that you cannot adjust this behavior, as it is intentional.
All LCD HDTVs have a light source behind the LCD panel. The LCD panel itself does not emit any light, it only filters it. So in order to see an image, a light is shined through the panel from the rear.
Your particular TV uses CCFL lighting, or Cold Cathode Fluorescent. If you were to look behind your LCD panel, you would see several very thin fluorescent lamps behind it.
Any time the scene being displayed is bright, the lamps will burn at full brightness. However, if a dark scene is displayed, the lamps will automatically dim to improve the black level of the scene. Unfortunately, while this behavior is intentional, it can be very noticeable and distracting while watching your movie.
Newer LED-backlit LCD HDTVs eliminate this problem. If you were to look behind the panel of an LED-backlit LCD HDTV, instead of seeing several long fluorescent tubes, you would see an array of tiny LED lights. With fluorescent backlighting, when the movie scene dims, all of the fluorescent tubes dim simultaneously, darkening the entire screen. With an LED array behind the TV, the TV is able to dim only certain parts of the screen, so that only the portions that are actually intended to be dark are darkened, without losing any brightness where it isn't desired.
For an excellent video explanation of CCFL vs. LED backlighting, see here:
http://www.sonyinsider.com/2009/04/12/sony-triluminos-explained/
However it is important to note that not all LED-backlit TVs are able to selectively dim portions of the scene. If the TV uses an "edge-lit" LED backlight, that means all the LED lights are arranged around the edge of the panel instead of behind it, and are reflected towards the panel with prisms or mirrors. This type of LED backlight dims in the same all-or-none method as a CCFL backlight.
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