A more visible but less common example of this is halos. I think a better description of this artifact would be auras. Picture white text on a black background, like the credits at the end of a movie.
You want the white lettering to be bright, and the black to be black. With large zones, the TV isnt able to make just the white lettering bright, it also has to make the area around the white lettering bright. The effect looks like a sort of halo or bright aura around the lettering.
The uber-expensive ELITE had very little issue with this, indicating it had enough zones (or clever enough processing) to avoid the problem.
The Sony, however, does not. At least, not at the stock settings. With the LED Dynamic Control set to Standard, there are all sorts of problems. Its like its trying too hard. The screen washes out constantly, and the scrolling credit test I mentioned before often results in flashing halos.
For example, picture the front of a house, during the day, with the door open. The front of the house is brightly lit.
The open door, revealing the dark interior of the house, should be dark. With a plasma or the ELITE, it would be. With the 55HX950, its gray
Part of the issue is the poor native contrast of the LCD panel itself. Turning off the LED Dynamic Control, were able to tell what the glass does on its own. So enabled,
I measured an average native contrast ratio of 1,498:1. Compare this to the 3,483:1 I measured with the ELITE, or the 13,900:1 I measured with a Panasonic TC-P55VT50.
Without a doubt, in terms of raw numbers, the 55XH950 is impressive, with a maximum light output of a staggering 134.7 foot-Lamberts. With the LED DC in Standard and the backlight control at max,
I measured 128.6 ftL with a full-field white, and 0.00029 ftL (converted from cd/m2) with a full-field black. So in theory, the 55HX950 is capable of a contrast ratio of 443,448:1 when the local dimming is fully enabled. The problem is, it never ends up looking like that
This is an odd case where restricting what the TV is capable of actually makes it look better. The first step is to select Low in the LED Dynamic Control setting. This limits the range between the brightest the LEDs can be, and the dimmest. On paper, this reduces the contrast ratio by several orders of magnitude. On screen, though, it actually looks better. Theres less washing out of the image. The other control is the Auto Light Limiter, which limits how bright the bright parts of the image can get.
If youre an audio person, reducing LED DC to Low is like narrowing a bandpass filter, while the Auto Light Limiter is like adding a low pass filter.
The result is a far more even picture that still has incredible contrast (as measured: 8,487:1). There are still some mild halos visible occasionally, but theyre less intense. The image doesnt seem to wash out as much as it did when everything was full-Gonzo. While the potential performance of this TV is extreme, and will no doubt look good on a salesfloor and in demos, once at home that same extreme nature of its local dimming (plus the large-ish zones) make for too bizarre of a picture. Tamping it down to reality reveals a contrasty, accurate image hidden behind the bluster.
Brightness uniformity isnt bad, with a slight brightness drop off near the edges with a white test pattern (not really noticeable with actual video), and a mottled look to full black images (rarely noticeable).
Motion blur isnt too bad. Using the FPD Blu-ray, I measured a base motion resolution of around 600-650. With any of the Motion Flow settings active, it measured the full 1080.
Interestingly, the Impluse setting, which pulses the backlight, is nearly unwatchable due to obvious flicker. It also cuts light output by over 70%. Clear and Clear Plus also drop the light output, but to far less an extent. The other settings use varying amounts of motion interpolation (soap opera effect), which personally I cant stand
Sony XBR55HX950 3D LED LCD HDTV- First Review | HD Guru
Source : Sony XBR55HX950 3D LED LCD HDTV- First Review | HD Guru
. Also note this is with the backlight set to 3 points below MAXIMUM.
hyeah:
hiding behind a forum ?:lol: grow up.
