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Best 4k projector of 2021: Reviews and Buying Guides

  • 21 Feb 2021
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A projector is one of the entertainment equipment lines that are most interesting to users. Projector gradually becomes closer to the daily entertainment of the user. With an equally sharp picture quality for a TV screen, but with a much larger frame. So 4k home theatre projectors have become the interest of many customers. A powerful 4k projector is an essential requirement if you want to use it for a business conference or evening at home. Our article today will give you a list of the best 4k projectors from the projector review on the market today and what to keep in mind before buying.

Buying Guides

1. The types of technology

In terms of technology, projector screen technology is divided into two main categories below. Let's read the two dongs of this technology to choose the one that best suits your needs.

  • Liquid crystal display (LCD) projectors typically use three transparent LCD panels - each in red, green, and blue - allowing individual pixels to be turned on or off as light passes through to create an image. Some LCD projectors have been known to produce a 'screen door effect', with thin lines in the projected image that some people can see. This can make the image appear as if you were looking at it through a very smooth screen and can be especially noticeable in large flat bright areas.
  • Digital light processing (DLP) uses microscopic mirrors housed in a matrix on a semiconductor chip, known as a digital differential device (DMD). In general, the more mirrors that are used, the greater the resolution of the projected image. Light is filtered onto the mirror through a color wheel to produce red, green, and blue screens alternating thousands of times per second, creating the final projected color image. DLP projectors use a single chip that has been known to produce a 'rainbow effect', a potentially distracting light streak with distinctive red, green, and blue hues visible behind the images seen on high contrast scenes. However, not everyone noticed this effect. Only one panel member in our viewing test noticed this effect and only in some cases, and they did not find it distracting. The best way to find out if this is an issue for you is to see if the DLP projector is working.

2. Brightness Level

There is no single best level of brightness, and brighter is not always better. For example, for  4k home theatre projectors that you plan to use in a dark room, 1,000 to 1,200 lumens can easily give you large and bright images, while 2,000 lumens can be so bright that it's hard to see. into the eyes. On the other hand, for a portable data projector you want to use in a location with good lighting, 2,000 to 3,000 lumens is the right range. And for large rooms, you might want something brighter.

While throw ratio is crucial, brightness is the most important technical parameter to get it right. And this is where the third information I've covered - the amount of ambient light - comes in. If the image is bright enough to be clearly seen, all other considerations will fly out the window. Getting enough light from a 4k projector is often the biggest challenge, but keep in mind that it's nearly impossible to get a projector too bright. The best level of brightness depends on the amount of ambient light, the size of the image, and even the material in the monitor you're using. If you are setting up the best 4k projectors for permanent installation, whether at home or in the office, it's best to buy from a knowledgeable source that can help you adjust the brightness to suit the lighting and screen conditions in the room.

In the ideal world we live in, the 4k home projector will always be used in total darkness. The more ambient light you add, the more you decrease contrast and wash the image. Even using a brighter projector only partially solves the problem, as the ambient light blends with the darker parts of the image, making them cloudy. If you had to use the projector in ambient light, you would never get the perfect picture, but at least be able to get a viewable image.

3. Resolution 

Most importantly, what affects the image quality and determines most of the cost you will spend on a projector is the resolution. Perhaps the male football enthusiasts are too familiar with this parameter. The higher the resolution, the more realistic, clear, and vivid the image is.

Resolution is roughly understood as the number of pixels in an image. Whether for home or business use at football cafes, it's a good idea to choose a projector with at least SVGA (800 x 600 pixels) resolution. In fact, the projectors for watching football were invested over 800 x 600 pixels. Specifically WXGA (1280 x 720 pixels), Full 4k hd projector (1920 x 1080 pixels), and the highest peak is 4K (4096 x 2160 pixels). In a home theater setup, the screen-to-viewer ratio is a lot smaller than in other apps - here, a higher resolution picture pays off. Otherwise, XGA could be as good as a base, though higher margins never hurt. Ideally, I recommend starting from WXGA and going up from there. Even if you're a PowerPoint user, speeding up to 16:10 won't matter, and you'll be ready if you want to present HD video. For special applications, such as a photo gallery, you'll want a higher resolution at least 1600 x 1200 (UXGA) for 4: 3 or 1920 x 1200 for 16:10 (WUXGA), if not better. In the case of home theater, you are really wondering whether to invest in 4K or not, as virtually all home theater projectors are Full native 4k projector (1920 x 1080).

If you really want science of resolution, a quick search on the Internet will reveal multiple computers with resolutions to which you can connect the screen size and viewing distance, and the computer will regain the resolution. These are great but just like the brightness, the content really needs to be counted in the data and the computer can't. A heavily compressed YouTube video can look like a hot trash no matter how you try to render it. On the other hand, if you are booking a projection room for a production company, a true 4k projector may be difficult to get rid of.

4. Contrast Ratio

Contrast ratio is probably the most pointless parameter you'll find. Like an HDTV, the best 4k projectors rely on so-called "dynamic contrast" to increase their paper-based performance. Dynamic contrast means comparing the deepest black with all-reduced brightness for picture A with the brightest white with maximum increase in brightness for picture B. Unlike TVs, screen surfaces are a closed contrast role. Some monitors of 4k led projector have high contrast, but viewing angles are reduced. Furthermore, any ambient light will reduce the effective contrast ratio by two digits. Under optimal viewing conditions, high contrast (10,000 and more) is a boon. But with more than a small amount of ambient light, a 500: 1 contrast ratio and a 100,000: 1 contrast ratio won't make a discernible difference.

In addition, the contrast makes images displayed on the projection screen more realistic, as estimated by the ratio between the brightest and darkest areas on the image. To see beautiful, sharp shadows and not miss any outlines due to dim light, choose a projector with high contrast, at least 3000:1 or higher. If used in people who are used by multiple sources to get more, you must choose 3000:1 at the same time.

5. Connectivity

Nowadays, an adaptable HDMI or HDMI connection is the de facto standard. Many existing A / V settings are connected to VGA, so there are still use cases for this legacy analog technology. In addition to VGA, multimedia projectors continue to offer similar SD connections as S-video and composite video in case you need it. Home theater projectors, aimed at the latest consumer devices, may have HDMI only (along with another "smart" connection). In large location projectors, SDI - the video transmission standard used in broadcast television - is popular because it provides simpler cabling, is easier to route and converts, and supports long cables than HDMI.

One tip for installation: don't run HDMI for more than 25 feet. There are HDMI cables that are longer, but the longer they go, the cable acts as an antenna, receiving RF signals. If you need to send HDMI out further, you can use baluns, a special converter box that regulates the signal so that it can be transmitted over a balanced (i.e. anti-interference) cable, usually Ethernet.

6. Extra Features

In addition to the main criteria mentioned above, here are additional criteria that you should also consider to select the best 4k projectors:

  • Glass: Usually the projector is installed horizontally centered horizontally with the screen. However, if it needs to be off-center, it will need to be rotated, which will turn the image into a trapezoid. Lens shift is a mechanism included in models such as the VPL-PHZ60 and VPL-PHZ50 that preserves image quality and aspect ratio, allowing for movement without tilting the projector.
  • Smart installation: Smart Settings provide presets that optimize brightness, color, cooling, and other settings to simplify installation and continuous operation. Selected projectors are equipped with an Advanced Smart Setup function to control ambient temperature and other parameters for long-term stable operation.
  • Interchangeable lensesProjector models like the WiMiUS S1 and our F series laser projectors offer optional lenses for a wider applicability to suit rooms of different sizes and throw requirements. Typically, they are used in auditoriums and museums where there are space restrictions, and projectors may need to be installed further away from the screen.
  • The age of the light: When I started selling projectors 16 years ago, people paid great attention to lamp life, the replacement cost was $300 and the lamp life was about 1000-2000 hours and the lamp would come on easily if the projector is not cooled down. Everything has changed and buying a projector based on bulb life is not necessary now. Think most best 4k projectors have lamp life between 8000-10,000 hours. If you use the projector 5 hours a week, 1600 weeks is 30 years. The lamp costs between $120 and $200 and has no similar cooling problem. Hence, when an LED light provides 30,000 lamp life, people seem dazzled for that but unless you're running 24/7, you don't need that amount of time.

Top 3  Suggest products

1. Optoma UHD52ALV

Optoma UHD52ALV True 4K UHD Smart Projector | Super Bright 3500 Lumens | HDR10 + HLG Support | Works with Alexa and Google Assistant | Voice Command | Support IFTTT, White
Brand: Optoma - UHD52ALV Resolution: HD, 4K
Brightness: 3500 Lumens Constract: 500000:1

Not only is this another great low-cost 4K projector from Optoma, but it also lets you control your multimedia content through Amazon Alexa voice control. Now you can have your device turn on and project a 4K UHD image on the screen through the DMD mirror within seconds. 

All corners of the image are guaranteed brightness with 2,400 ANSI lumens and a contrast ratio of 500,000: 1 for finer detail in every image with 8.3 million pixels. A wide variety of devices such as: normal mode, brightness mode and film/photo mode, each compatible with Ultra Detail technology with enhanced image quality and depth and enhanced clarity. 

Alexa compatibility (also compatible with Google Assistant) allows users to turn the projector on and off, adjust volume, built-in dual 5W speakers, change input source (TV to gaming system to PC, etc.), change slideshow settings, and change installation specifications. The installation is rather easy and includes auto-alignment with vertical lens shift and 1.3x zoom for more flexibility and control over resolution for any space (maximum screen size 302.4 inch). 

Additional features include remote control, compatibility with all computers, support for PDFs and other presentations, as well as a built-in web browser for users to experience beautiful visuals more than ever.

2. VAVA 4K UST Laser TV Home Theatre Projector

VAVA 4K UST Laser TV Home Theatre Projector | Bright 2500 ANSI Lumens | Ultra Short Throw | HDR10 | Built-in Harman Kardon Sound Bar | ALPD 3.0 | Smart Android System, White
Brand: VAVA - 4K Resolution: HD, 4K
Brightness: 2500 Lumens Constract: 3000:1

Experience a real home theater with VAVA 4K UST new ultra-thin bestselling 4K projector. Designed with the enthusiasm of in-house moviegoers, VAVA 4K UST uses the latest advances in video processing technology to produce an amazing image with outstanding detail and stunning images. REC10, HDR10, DLP DarkChip3, BrilliantColor color memory, and a new 6-segment (RGBRGB) color wheel ensure that images and videos are projected at optimal levels and brilliant colors. 

Not stopping there, this VAVA 4K UST projection device also supports a 1.5x zoom range and vertical lens shift capability for greater installation convenience and flexibility. Other features include long energy efficiency lights, 10W audio speakers, USB port and HDMI 2.0 (x3) port for high quality digital video signals and fast data transfer rates for users with Peace of mind when using.

3. LG HU85LA Ultra Short Throw 4K UHD Laser Smart Home Theater

LG HU85LA Ultra Short Throw 4K UHD Laser Smart Home Theater Cinebeam Projector with Alexa built-in, LG Thinq AI, and LG webOS Lite Smart TV (Netflix, Amazon Prime and VUDU)
Brand: LG Electronics - HU85LA Resolution: 4K
Brightness: 2700 Lumens Constract: 2000000:1

LG Smart 4K projector to make it easy to set up your dream home cinema. It can project at 4K resolution for sharp, vivid, and true-to-life images. It also uses 3-channel laser technology that does not use the color wheel. This allows for accurate color reproduction of any image. It uses 2,700 lumens of light for easy indoor lighting. The projector also projects images in original quality with dynamic tone mapping. Images appear smooth on the screen with the projector's TruMotion. The projector features AI and smart content access for easy use.


1. Does the rainbow effect affect the projector's picture quality?

The rainbow effect is an artifact observed on many single-chip DLP-based projectors and is mainly due to the color wheel producing different colors at different times. This effect is considered a rainbow streak in the corner of your peripheral vision as you move your eye over the image. As DLP technology evolved, the faster spinning wheels significantly reduced this effect to the point where people barely notice it today.

2. How to install the projector at home?

The need to install projectors is quite common, whether it's offices, classrooms, halls or home cinema rooms. The projector is installed either ceiling or wall-mounted to bring professionalism and courtesy to the projection room space. We would like to show you how to install a professional ceiling projector through the following steps:

  • Step 1 - Locate the screen: The principle of determining where to place the screen is to choose a wall that does not have direct light, if required, the wall has a lot of direct light, then use restrictions by window blinds or paint colors. Then determine the distance from the ground to the bottom edge of the screen. And determine the size of the screen
  • Step 2 - Locate the projector: Calculate the projection distance is the distance from the center of the screen to the projector lens
  • Step 3 - Prepare the projector bracket: The next step we should do is to choose the right projector mount (or projector bracket), different projector mounts in the location where we mount the projector (the projector is wall mounted or ceiling mounted). The arm mount can be adjusted to the minimum to maximum length, the load of the projector mount unit should be proportional to the weight of the projector.
3. What can we do to expose blue light from the projector?

The blue light discussed in this article is part of the UV wavelength, thus explaining its destructive potential for your stretch marks. It's scary to think that your TV and computer as well as cell phones contain UV-grade blue light that can harm your eyes when you look at us, especially because we are specially manufactured that is special to consider. You can't be good at applying eye cream to block UV rays and wearing sunglasses ruining your TV viewing experience.

4. How do I choose a projector with minimal noise?

Each projector's noise rating is also something to consider. Essentially, every projector has a very hot light source that provides light to the image. The projector is equipped with a fan designed to cool the lamp source and prolong the life. The fan will run quieter in Eco mode because you are basically reducing the power of the lamp and thus heat is generated. In general, anything below 30 dB is pretty quiet. Home theater projectors are especially quiet because you don't want to sit nervously in a quiet place during the movie and hear fan hums.

5. How to clean the projector lens?

Keeping your projector lens clean can significantly improve image quality, but you don't want to overdo the product, and cleaning methods could damage the glass or internal electronic devices. Here are some tips for you to clean the projector lens:

  • Always wipe the lens in a circular outward motion from the center. If you wipe the same area more than once, you will only spread debris around the glass.
  • Always use products with special labels to clean the lens.
  • Always keep cleaning products such as microfiber cloth and lens broom in a safe place so they stay clean at all times. The dirty lens brush is essentially useless.
  • Always spray the can in short bursts to avoid damaging the glasses.

Final Thoughts

In general, a projector is an important piece of equipment for the home cinema system. While a TV is a better choice for delivering true 4k projector HDR, you can't get an image larger than 75 inches. Whether you want to project Blu-ray movies on a large white wall, enlarge your gaming experience or view photos and slides from your mobile device onto a 100-inch screen, the best 4k projectors are your first choice. Here are the best projectors from Full HD to native 4k projector models that support HDR at all the prices to choose from.

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