Q. 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
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
A. 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.
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.
I have a Viore 32" Class 1080p LCD HDTV 60Hz, LC32VF62?
Q. And everything is fine I just have noticed lately that whenever I watch ESPN or any other sports network the sports crawl on the bottom of the screen tends to get fuzzy sometimes so much so that I thought it was my vision but I watched ESPN news on my sisters standard TV and no fussiness I even went so far as to ask my nephew to read the sports crawl on my TV and said it was very to and his eyesight is almost perfect I just want to know is this a serious problem or is it because I don't have HD hooked up to my TV even though it is an HDTV any help is appreciated Max points for the best answer please
A. All LCD and LED tv have a problem with blur motion. To reduce the blur motion you need to have the faster refresh rate of the 120HZ or the 240HZ, which also raises the price of the tv. Most consumers are not aware that you are not going to see any difference between 720P and 1080P in screen smaller than a 46". The only source for 1080P is the Blu Ray disc movies and some PS3 video games. LCD and LED tv also have a viewing angle limitation compare to a Plasma tv. As the angle increase the picture quality of an LCD or LED tv decreases. Another issue on most bargain price tv is the power circuit board going out, Panasonic and Samsung are the top brand for quality and reliability. Keep in mind, you get what you pay for. Hope this will help you out.
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