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Important Of Lcd Tv Brightness & Contrast** | A Arts-and-Entertainment Article
Unlike computer monitors, brightness is an important parameter in the choice of a LCD TV set. Since a TV set is viewed from a distance, a (measured) brightness of 220 to 250 nits is appropriate, where for a computer monitor, that would be too bright. When we talk about brightness here, we're referring to the values we've measured ourselves,[link widoczny dla zalogowanych], not the exaggerated, basically useless values claimed by the manufacturers. Some claim up to 800 nits of brightness, a level that would be like looking at a welding torch through a color slide.
Contrast is another story. A good contrast level is always preferable, but you have to be careful not to confuse contrast ratio and screen dynamics. Here's an example to make that a little more clear.
Here I am trying to display concentric circles in shades of gray, from the lightest to the darkest. Screen A shows the shades correctly, but screen B shows only two shades. They have the same contrast ratio - that is, the relation between the whitest point on the screen and the blackest - but not the same dynamics. Screen A shows more details and more nuances than screen B. So as you can see,[link widoczny dla zalogowanych], you need to be careful about manufacturers' claims regarding contrast ratio.
Latency is a crucial parameter for users of LCD Televisions, because LCD panels are fundamentally slow. The latency measurement indicates the time it takes for a pixel to change from totally black to saturated white and back to totally black again. Unfortunately, that value is not very representative of reality,[link widoczny dla zalogowanych], because pixels rarely make such extreme transitions. A pixel can change, for example, from dark gray to a lighter gray, and in that case the latency is much worse than what the manufacturers claim.
This curve shows the different latency values as a function of the gray level to be displayed. A change from black to white is shown on the curve as a point at 255 on the X-axis, a black-gray transition is 125 on the X-axis, an alternation between black and dark gray is 50, etc. The official ISO response time specified by the manufacturer is only for black/white transitions (0/255). While the value we measured is in agreement with the manufacturer on this point,[link widoczny dla zalogowanych], it doesn't mean much as far as the panel's real-world responsiveness is concerned.
While computer applications are highly sensitive to latency, TV sets are a different matter. A TV doesn't have a refresh rate of 60Hz by default - depending on the format, the rate is most often 30 Hz, or 30 images per second interlaced. That would seem to mean that a latency of 33 ms (1/30 Hz) would be sufficient, but that's not so. It's theoretically sufficient for an interlaced signal, but not for applications on a PC, like video games for example. And with PC/TV convergence the coming thing, 33 ms is not really enough. It would also rule out progressive video formats like 720P. And even for ordinary TV use, a 33 ms latency would be visible when sudden movements occur on-screen.
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