Why UHD Is Way Better Than HDTV–Pt. 1
If you’re in the market for a new TV or projector, you’ve likely been bombarded by a lot of new terms and technologies you haven’t heard before. Ultra HD (aka Ultra-high-definition or UHD) burst onto the scene a few years ago and brought with it some major changes and improvements to our display systems. And now that prices are reaching mass-market levels, it would be foolish to buy a new set that wasn’t Ultra HD.
Wondering what all the fuss is about? In today’s post, I’ll talk about the first two things you need to know about this exciting new video tech and will discuss the final two tomorrow.
The height of home video prior to Ultra HD was called 1080p, with the “p” standing for “progressive.” Those sets produced 1,920 horizontal pixels and 1,080 vertical pixels for a total of just over 2 million pixels on screen at any moment. UHD doubles the number of pixels in both directions, producing a resolution of 3,840 by 2,160, delivering nearly 8.3 million pixels on screen, or four times the amount of 1080p. That is why Ultra HD is often referred to as “4K”.
What do all those extra pixels mean? Greater definition, razor-edge sharpness, and finer details. Video artifacts like “jaggies” and “moire” are a thing of the past. Every strand of hair, every blade of grass, every grain of sand shows up like never before. As an illustration, imagine if you had a pencil and drew two same-sized circles, one with 10 dots and one with 40 dots. The 40-dot circle would have more resolution and be better defined. That’s the difference between 1080p and UHD.
HDR is another term you’re going to hear a lot. It stands for High Dynamic Range, and it’s actually more important for picture quality than all those extra pixels. If you’ve taken any pictures on a modern smartphone, you’ve probably noticed the HDR tag. It works by capturing images with different exposures and then combining those separate images into a single photo that maintains the detail from the darkest and brightest regions.
In the past, TVs would “crush” the image at one end of the spectrum or the other, sacrificing black levels in bright scenes or lowering overall light output in dark scenes. But new Ultra HD TVs can simultaneously produce deep, dark blacks and bright, brilliant whites, meaning they can deliver images more like what your eye is capable of seeing. This gives the image great contrast, and delivers punch, depth, and reality like never before.
In Pt. 2, I’ll walk you through the other two crucial things you need to know about Ultra HD.
Probably the most experienced writer on custom installation in the industry, John Sciacca is
co-owner of Custom Theater & Audio in Murrells Inlet, South Carolina, & is known for his writing
for such publications as Residential Systems and Sound & Vision. Follow him on Twitter at
@SciaccaTweets and at johnsciacca.com.