Sharp Aquos LC-40D78UN LCD HDTV Review
Not the best budget TV we’ve reviewed, but it gets the job done for a reasonable price.
The Toshiba LC-40D78UN had a moderately deep black level. We measured it at 0.21 candelas per square meter (cd/m2), which is probably a meaningless number for non-cinephiles. Basically, anything with a black level of 0.10 cd/m2^ or less will produce a very deep, rich black. Black levels in the 0.20 cd/m2^ range are average, and anything over 0.30 cd/m2^ will have that distinct "bright black" look.
While the LC-40D78UN has a black level that will be adequate for most users, those looking for perfect picture quality should look elsewhere. More on how we test black level.
Toshiba LC-40D78UN wasn't the brightest LCD we've reviewed. You only really need 200 cd/m2to get an adequate picture, and we measured the LC-40D78UN at 269.84 cd/m2. Even though this will be enough for most users, it's not very bright for an LCD—especially one with such a middling black level. More on how we test peak brightness.
A TV's contrast is the ratio of its brightest white to its darkest black. Our eyesight is based on contrast, so a TV's contrast ratio is important for maintaining an image's detail. We measured the Sharp LC-40D78UN's contrast ratio at 1289:1, which is a bit below average for a modern LCD. It's the result of a mediocre black level and brightness. Again, while the average consumer might not notice a particularly bad contrast ratio here, people that know what to look for could spot this TV out of a line-up. More on how we test contrast.
Our tunnel contrast test measures the consistency of the black level. Sometimes when there's just a small amount of black on the screen, the black level gets washed out by the surrounding brightness. The Sharp LC-40D78UN had a pretty even black level, regardless of what percentage of the screen was black. More on how we test tunnel contrast.
Some TVs have trouble maintaining their peak brightness when the whole screen is white. For example, plasmas simply can't handle the energy requirement. The LC-40D78UN, however, maintained a pretty consistent level of brightness. You shouldn't have any issues with bright details fading on a predominantly dark screen, or with the TV's brightness dropping when the screen is predominantly white. More on how we test white falloff.
For the most part, the Sharp LC-40D78UN's screen was pretty uniform. With an all white screen we only noticed some minor dimming in the corners and around the edges. On an all black screen the display was a little cloudy, but the lighter parts were fairly faint. Basically, unless you're looking at an all black screen, you won't notice the uniformity issues. More on how we test white falloff.
Greyscale gamma describes how a TV emulates all the greys between the darkest black and the brightest white. The slope of this curve should be about 2.2. This ensures an even progression through shades: two adjacent shades won't be so similar they'll look identical, and they won't be so dissimilar the shades won't blend together seamlessly.
We measured the Sharp LC-40D78UN's greyscale gamma at 2.40, which is a bit aggressive. If you look at the graph below, you'll see there's a bit of a dip towards the dark end. The flatter part indicates the shades are a bit too similar, and the steeper portion indicates the shades are a bit too different. Overall, though, the LC-40D78UN's greyscale gamma was spot on. More on how we test greyscale gamma.
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- Color Accuracy
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- Power Consumption
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