LG 60PK750 Plasma HDTV Review
Not the greatest performer, but a decent price for a 60-inch set with basic online features.
Our typical milestone for a good black level is 0.01 cd/m2, with mediocre falling around 0.02 cd/m2^ and terrible encompassing anything anything in the neighborhood of 0.03 cd/m2^ or higher.
We measured the LG 60PK750's black level at 0.09 candelas per square meter (cd/m2). This is a very deep black; you should have no issues with dark areas looking washed out. The one problem we saw, though, was the TV has an awkward auto-dim feature that can't be turned off. It dims in stages when the picture dips below a certain threshold and the dim itself is noticeable. We understand why this feature is often included, but users should have the option to turn it off. More on how we test black level.
Plasmas typically don't have high peak brightness levels. We measured the LG 60PK750's peak brightness at 166.2 cd/m2. This isn't very bright compared to what LCDs can output, but it was quite a bit brighter than many other plasmas we've tested. While you shouldn't expect blinding whites, you should get a picture that's bright enough for most viewing environments. More on how we test peak brightness.
A decent black level and a dim peak brightness don't make for the most stark contrast ratio. We measured the 60PK750's at 1846:1, which is decent. On the chart below, you can see that the TV's competitors all had better contrast ratios: the two LCDs had superior brightnesses and the Panasonic plasma had a significantly deeper black. More on how we test contrast.
The LG 60PK750 didn't have the most consistent black level. When a black area is surrounded by brightness, it gets very washed out, appearing about three or four times as bright. This variance is typical of plasma screens, due to their display technology. More on how we test tunnel contrast.
The 60PK750 wasn't able to maintain a consistent white level either, which, again, is typical of plasmas. When a small portion of the screen is white, the TV can output over 170 cd/m2, but when the whole screen is bright, that luminance drops to under 50 cd/m2. More on how we test white falloff.
The LG 60PK750 has an incredibly uniform screen. We really didn't see any issues with it. An all black screen didn't reveal any cloudiness, and an all white screen didn't dim towards the edges or corners. More on how we test white falloff.
Greyscale gamma dictates how different shades of grey darken or brighten to black or white. Ideally, as you move along the greyscale, the shades should darken or brighten uniformly: if there's too much change or too little change, you'll end up losing detail in the onscreen image.
The graph below is should be a straight diagonal line, but as you can see, there's a bit of a hump in it towards the brightest part of the spectrum. Up until that point, the greys had progressed uniformly; after that point, there wasn't enough differentiation between the shades. What this means for you, the viewer, is lost detail in large, bright areas. More on how we test greyscale gamma.
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- Color Accuracy
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- Power Consumption
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