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One of the first things you see when shopping for a TV is its resolution. You'll often see the resolution slapped right on the box or even in the model name. 4k TVs started to dominate the TV market in the middle of the 2010s, and they soon took over from 1080p as the most common resolution found on TVs. Almost every TV from big manufacturers has a 4k resolution, and it's actually hard to find 1080p TVs now, but what exactly are the differences between each
4k and 1080p refer to the resolution of the display. A 1080p TV has 1920 horizontal pixels and 1080 vertical pixels, while a 4k TV has 3840 horizontal pixels and 2160 vertical. It can get confusing because 1080p refers to the number of vertical pixels (1080), but 4k refers to the number of horizontal pixels (3840). So while the name makes it sound like a 4k display has four times the amount of vertical pixels, in actuality, the amount of vertical and horizontal pixels on a 4k display are each double that of a 1080p display. However, this means that overall, a 4k TV also has four times the total amount of pixels as a 1080p TV, which you can see in the table below.
There are different marketing names for each, but having a 4k TV doesn't necessarily mean it's better than a 1080p; there are many different factors that affect the picture quality. A higher resolution simply means it supports more content and delivers crispier images. You can see some of the differences between 4k and 1080p below. You can also read about resolution here.
As 4k TVs are the norm, native 4k content is also easy to find on most streaming apps like Netflix, Disney+, and Amazon Prime Video. Physical video sources, like Blu-ray players and gaming consoles, are starting to support a 4k resolution as well, but they were limited to 1080p for a long time. Regular Blu-ray discs are 1080p, and there are now 4k Ultra HD Blu-ray discs as well, but it's an entirely new format and requires you to upgrade your Blu-ray player and purchase new 4k Ultra HD Blu-ray discs. The original Xbox One and PS4 were limited to 1080p, and then the PS4 Pro and Xbox One X/S, followed by the PS5 and Xbox Series X, were each released with 4k support.
It's becoming harder to find 1080p TVs in the 2020s, and they're usually limited to small, entry-level models. If you have limited space and need a small TV, you'll likely need to get a 1080p model, since 4k TVs are usually available in larger sizes.
The two photos above illustrate an identical image at different native resolutions, which means the image's resolution and the TV's resolution are exactly the same. The first photo is a 4k image displayed on the Hisense H9G, and the second is a 1080p image displayed on the TCL 3 Series 2019.
Native 4k content is very popular, especially on streaming apps, but some of what you watch may still be lower-resolution content upscaled to UHD, which will look different from native 4k. To present lower-resolution material on a 4k TV, the TV has to perform a process called upscaling. This process increases the pixel count of a lower-resolution image, allowing a picture meant for a screen with fewer pixels to fit a screen with many more. However, it doesn't increase the detail of the image since the signal has the same amount of information. Above you can see the difference between a 1080p resolution on the 4k Hisense and on the 1080p TCL.
HDR, which stands for High Dynamic Range, started to become more popular around the same time as 4k TVs. While it's often marketed together, it has nothing to do with the resolution and actually refers to the colors and luminance. It allows content creators to use a wider range of colors and luminance levels. It helps improve the picture quality and produces richer, more vibrant colors. There are different HDR formats, and you may see some companies advertise 4k HDR, but just because a TV supports it doesn't mean that HDR looks good. However, the large majority of 1080p TVs don't even support HDR, so if you want to watch your favorite HDR content, go for a 4k TV. You can learn more about HDR here.
This chart illustrates the dividing line for normal 20/20 vision. To use the chart, check your viewing distance on the vertical axis and the size of the TV on the horizontal one. If the resulting position is above the line, you probably won't see a major difference between a 1080p and a 4k TV. Essentially, there's only a noticeable difference if you sit close to a large screen TV.
In the United States, there are two standard resolutions for cable TV broadcasts: 720p and 1080i. Much like 1080p, the number refers to the vertical resolution of the screen, 720 and 1080 pixels. The letter refers to either progressive scan or interlaced scan. Every TV sold today uses progressive scan, but they're also compatible with a 1080i signal.
When you're shopping for a TV, it's likely you're going to get a 4k model. A TV's resolution can be its main selling point, as it's easy to throw the 4k label on any TV, but the resolution is only one small factor in the total picture quality. While 4k is an upgrade from 1080p, it may be hard to notice the difference in resolution if you sit far from the TV, or if you just watch 1080p content. Since most TVs now are 4k and it's hard to find 1080p models, you won't really have to choose between 4k and 1080p anyway.
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Low Brightness Mode. The ZH403 power settings run from 100% (full power) to 50% in increments of 5%, with the measurement for each setting roughly matching the stated percentage. Brightness was reduced by 7% at both the 95% and 90% settings, for example, 16% at the 80% setting, and 45% at the 50% setting. There is also an Eco setting, which has the same effect as setting power to 50%. The power level also affects light-source life, rated for 20,000 hours at 100% and 30,000 hours at 50%.
Zoom Lens Effect on Brightness. Compared with the full wide angle setting, the ZH403's full telephoto setting reduced measured brightness by 12%. This is a small enough drop to ignore in most cases when considering how far to position the projector from the screen.
Video Optimized Lumens (SDR). Thanks to its delivering the most accurate color of all the color modes, the best contrast, and the darkest black level, sRBG with default settings is the obvious pick for video. Its measured 1,072 lumens is enough to light up a 150-inch, 1.0-gain screen in a dark room or a 95-inch, 1.3-gain screen in moderate ambient light. Keep in mind that even though the projector can accept 3840x2160 input, it has to convert the input to the DLP chip's native 1080p to show it. Somewhat counterintuitively, the image was a little sharper when I left my Blu-ray player resolution set to Auto, so it would first upconvert the content to 3840x2160 and the projector had to convert it back, as compared with setting the player to 1080p to avoid the two conversions.
Contrast, Black Level, and Three-Dimensionality. For 1080p film and video content, the sRGB mode offered contrast, black level, and shadow detail comparable to a sub-$1,000 home theater projector, which is better than many high brightness projectors meant for business and education can manage.
An A/B comparison between 4K UHD HDR and 1080p SDR versions of the same movies showed that the image was a little sharper with 4K UHD content, shadow detail was noticeably better, and colors had better saturation. However reds and yellows were a little dark compared with the color for 1080p content. There is no HDR Brightness setting, but the HDR Picture Mode gives some of the same flexibility for adjusting tone mapping for HDR. Setting the mode to Bright rather than the default Standard improved the issue with reds and yellows somewhat in scenes dominated by midtones without hurting dark scenes.
Brightness Uniformity. The test unit delivered 64% brightness uniformity at its full wide angle setting and 71% at its full telephoto setting. Using a solid white image, the difference was visible at both settings as being brightest at the bottom center of the image and slightly dimmer going both up and towards each side. However even 64% is better uniformity than many inexpensive home theater projectors can manage, and it's little enough that's its hidden by any image that breaks up the field of view with text, graphics, or a photorealistic picture.
At this writing, the DLP-based Optoma ZH403 is the least expensive native 1080p laser projector on the planet by several hundred dollars, and its aggressive price is even more impressive when considered alongside its performance. Quite simply, the combination of features and performance is spot on for the kinds of applications the projector is meant for, most notably presentations and occasional video in a mid-to-large size room as well as digital signage and museum exhibits.
For 1080p SDR content and using our preferred settings, the ZH403 delivered eye-catching color for graphics, suitably neutral color for photos and video, and good enough contrast, shadow detail, and three dimensionality to make movies and video highly watchable. It also supports HDR well enough to make 4K UHD HDR video content highly watchable as well, with a noticeable boost in both color saturation and shadow detail. And the Dicom Sim mode makes it appropriate for medical presentations.
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