Best 4k Projectors

• The most important facts in brief
• 4K projectors can bring videos and images onto the screen in UHD quality. They are equally suitable for home cinema and presentations.
• A distinction is made between three technologies: LCD, LED and DLP are each suitable for specific purposes.
• Properties such as luminous intensity and contrast provide information on the scope of recommended use.
• Every projector needs a screen as a projection surface. Both components should be placed at a certain distance and in the centre of each other.

Use of 4K beamers

To throw images and videos on the wall in large format, you need a beamer, also called a video projector. If you want to watch films in high quality in a private setting or set up a home cinema, your attention should be focused on 4K beamers. The resolution provides a detailed image even on large screens. However, if you use a video projector mainly for presentations, for example in your job or at university, a lower image quality is sufficient.

What does 4K actually mean?

In 4K, films and images are reproduced with a resolution of 4,096 x 2,160 pixels. It corresponds to the 16:9 format, the common format for cinema films. In the UHD (Ultra High Definition) resolution for TV sets, the number of pixels is lower calculated on the whole picture. However, the quality is just as high.

Originally, projectors produced light images that were available in the form of slides, for example. The motif, captured on film or celluloid, was enlarged by mirrors inside the projector and projected onto the wall through an illuminated lens. Although the principle remains the same in modern, digital beamers, they do not rely on external image carriers but make use of data transmission.

Components of a beamer

Light source

The light in the beamer comes from a halogen lamp that comes close to the brightness of daylight. Curved mirrors focus it and direct it to the optical lens. Bear in mind that the life of the lamp is limited, ranging from 3,000 to 15,000 hours. Operating in eco mode extends the life, maximum brightness reduces it. A replacement lamp is not cheap and can cost you up to 200 euros, depending on the model.

Cooling

The light heats up quickly. That is why beamers need a fan inside to keep them cool. For users, it is important that the fans are not so loud that they interfere with watching a film. With poorly manufactured devices, this can happen after a while. So if the projector is close to the viewer, you should choose a high-quality model.

Housing

As a rule, projectors are made of hard plastic, which is not affected by minor knocks or scratches. Non-slip feet, for example made of rubber, are often attached to the underside so that the devices have a stable stand. Sometimes they are also height-adjustable to compensate for an uneven surface or to slightly change the direction of the projection.

Speakers

All 4K projectors have a speaker that is sufficient for the sound of movies or video games. For home cinema quality sound, you should also invest in a surround system. This can be connected to the projector with a cable, but with some models it can also be connected wirelessly.

Beamers for different needs

4K projectors are available in portable and fixed installation versions. Home cinema projectors are the all-rounders among the devices and are usually intended for a fixed location. They can also be mounted on the ceiling or walls with brackets. Some beamers have a 3D function. This is particularly attractive in the gaming sector, as it provides a more intensive gaming experience. The image signal is transmitted with a low delay.

Presentation beamers, e.g. for schools or offices, are characterised by low weight and compact dimensions because they are mobile. They have special lamps that can produce a higher luminous intensity. This allows them to display images and videos clearly even in bright light conditions.

The projection technology of beamers

Anyone considering buying a projector will sooner or later come across the terms DLP, LCD or LED. These abbreviations describe the projection technology with which the projector projects the image. Depending on the intended use of the device, they have advantages and disadvantages.

DLP – Digital Light Processing

This technology uses colour wheels and many small mirrors to display the colours. The refraction of light causes the rainbow effect: colourful colour gradients can appear at edges in the picture. Modern devices often manage to avoid this effect. It still occurs with older or less high-quality models. DLP projectors can display 3D effects very well and have a high contrast value. On the other hand, some red or green tones do not appear too rich. The technology is more durable than that of LCD beamers, but due to the rotation of the colour wheel, the devices are usually noisier.

LCD – Liquid Crystal Display

On its way to the screen, the light from the lamp passes through a layer of liquid crystal pixels like those used in televisions and screens. These pixels create the image. LCD beamers are cheaper than other models and are often used as portable versions. This is because the technology can display edges and text extremely sharply, which makes it particularly suitable for presentations and image displays. On the other hand, these beamers have deficits in the display of fine grey gradations. In addition, less high-quality units may have a coarse pixel display.

LED – Light Emitting Diode

In this case, the light source consists of many small LEDs. The advantage here is the low heat generation and good energy efficiency. Since beamers do not need a fan, they operate more quietly than other models. LEDs are very durable, but the purchase price is correspondingly high. The light intensity is lower compared to other technologies, which is why LED beamers are less suitable in bright lighting conditions. In addition, the maximum projection area – with the same quality – is larger with LCD and DLP projectors.

Differences between models

Depending on the lighting technology, projectors are capable of different levels of performance. Depending on the use and location, other values are important. Therefore, always pay attention to the manufacturer’s specifications.

Light intensity

The luminous intensity of many projectors is between 1,000 and 1,500 lumens, which is sufficient for use in darkened rooms. Other models reach up to 3,000 lumens; however, such values are only useful if you use the projector in daylight conditions.

Contrast

Contrast refers to the maximum difference that can be displayed in the various brightness levels. The higher the value, the sharper and richer the image. For films, a ratio of at least 10,000:1 is recommended.

Connection options

Before buying, check whether the set has the connections you need. HDMI and USB connections as well as a socket for cinch cables are usually available. A wireless connection via Bluetooth is sometimes also possible. If you want to connect several devices simultaneously, you should make sure that the projector offers a correspondingly large number of connection options.

Noise level

The noise level of the cooler is usually in the range of 20 to 25 decibels. This is as quiet as a whisper, so objectively speaking it is not particularly loud. However, as a constant noise during a movie night, it can be annoying, which is why you should pay attention to a projector that is as quiet as possible.

Accessories for 4K beamers

For a cosy movie night in the home cinema or a high-quality presentation with the 4K beamer, you need additional accessories. Some are absolutely necessary, others are optional. Therefore, when buying, consider which accessories you need to purchase later or which are included in the scope of delivery.

Screen

A screen is indispensable for enjoying a film. It is true that the beamer also casts an image on normal white walls. However, a special beamer screen has much better reflective properties and thus ensures a higher picture quality. This should correspond to the format of the beamer’s image reproduction. Cinema films are usually shot in 16:9. To determine the optimal screen size, there is a rule of thumb. It should be about half as wide as the distance between the viewer and the screen.

Bracket

If necessary, a projector can also be mounted on the ceiling or wall. To do this, you will need a bracket or a corresponding stand, which can also be connected to the wall. It is also possible for the projector to stand on a small platform that is screwed to the ceiling. For a better hold on the surface, the unit is usually equipped with a screw thread on the underside.

Problems with the image

Putting an optimal image quality on the screen is not that easy. A number of steps need to be taken into account and correctly applied: from the choice of location to the best lighting conditions to the right projection surface.

If the image has too little intensity, i.e. weak contrasts or colours, then there may be something wrong with the screen. A suitable film screen is white smooth and coated with vinyl fibres. The wrong colour or a rough surface texture will greatly affect the quality of the image. Keep your canvas clean and make sure it does not wrinkle.

If the image appears slightly trapezoidal, it is because the projector is positioned incorrectly. It should always be centred in relation to the screen. Slight shifts of this kind can be corrected by a projector on its own; in this case we speak of keystone correction. Depending on the quality of the projector, this is done by lens shift or with the help of integrated software.

A flickering light usually means that the life of the built-in lamp is slowly coming to an end. In this case, try to get a new one as soon as possible. If the problem occurs shortly after the initial start-up, loose contacts on the circuit board or loose-fitting plugs may be the problem.