Sony Bravia KDL-55EX620 LED LCD HDTV Review$2,099.00
Blacks & Whites
- Black Level
- Peak Brightness
- Tunnel Contrast
- White Falloff
- Greyscale Gamma
The Sony Bravia KDL-55EX620 produced a deep black level, measuring 0.07 cd/m2, according to our testing. That's quite good, on par with the best LCDs we've reviewed, and even some plasmas. More on how we test black level.
With a peak white of 313.35 cd/m2, the Sony Bravia KDL-55EX620 is plenty bright enough. It should hold up well against ambient light that can wash out a dimmer TV. More on how we test peak brightness.
The Sony Bravia KDL-55EX620's contrast ratio measured a healthy 4476:1. That's not quite as wide as the Sony EX720 series we reviewed, which is the next step up from the EX620 series, but the difference is fairly minor. You probably wouldn't notice the difference unless you had the TVs side-by-side. More on how we test contrast.
The Sony Bravia KDL-55EX620 had no problems maintaining a consistent black level, regardless of how much or how little black area was on the screen at any give time. More on how we test tunnel contrast.
The Sony Bravia KDL-55EX620 maintains a perfectly consistent peak brightness, regardless of screen content. More on how we test white falloff.
On a mostly-dark or all-black screen, we noticed some cloudiness, a common problem with LED-edgelit TVs. The backlight just isn't distributed evenly enough. It's not as bad as we've seen on some TVs. More on how we test white falloff.
The greyscale gamma test measures how well a TV transitions from black to white within the greyscale. The Sony Bravia KDL-55EX620. What we're looking for in the chart below is a smooth curve with an upward slope between 2.1 and 2.2. As you can see in the chart below, it's definitely a smooth curve. There are a few kinks in the lower-left portion of the line, indicating that you might see some banding in the shadows. The slope of the curve is also a little steep, so the Sony Bravia KDL-55EX620 is probably missing some of the finer gradations in the greyscale. All told, though, it's a good performance. More on how we test greyscale gamma.