What is a video projector and how does it work?

A projector or video beam is a device or device designed to receive a video signal and project it onto a projection screen or other surface.

The video signal supplied on a projector can be from any device that can output a video signal, such as: a computer, tablet, mobile, usb, video game console, video mixer, video camera, among others.


How an LCD Projector Works (1)

Although there are different kinds of projectors,much of them work mainly under the same operating principle.

Mainly the projectors have a focus, lamp or laser that emits a powerful enough light which goes through a series of elements and processes to convert the supplied image or video signal, into a projection.

To better understand how a projector works, it is better to know the different types of projectors. Since each type of projector works under a different process.


Types of projectors

The types of projectors can be classified in different ways… Depending on its use, characteristics, projection technology, resolution and lumens.

The main way to
define projector classes is
based on the technology they use to project onto a projection surface or screen:

  1. DLP projectors
  2. LCD projectors
  3. LED projectors
  4. Laser Projectors
  5. Hybrid Projectors (Laser – LED)



To know how to choose a suitable video projector the first thing to know is the purpose for which you want to use the projector.

To choose a good video projector you must define the field of use, there are different criteria to consider when buying or renting a projector.

You should also think, if you really need in a projector or TV. What should you choose to buy? If you would like to have a giant screen then closer it may be a projector.

As an initial classification, a projector can be for home or corporate use.

How to choose a projector for home use?

Usually, if you are going to have a projector for home use, it will surely be a projector for home theater and the best option would be a projector with a ratio of 16:9,since most movies are available in this format.

Currently you can buy projectors with 4K resolution (3840 x 2160) at a very good price, but if your budget is not enough for it, there is also always the option of Full HD projectors (1920 x 1080).

If the space where you want to locate the projector is completely dark, then a projector of approximately 1500 ANSI Lumens will suffice; but if there is a lot of ambient luminosity, it will be better to buy a projector of at least 3500 ANSI Lumens.

The latest TVs, Blu-ray and video game consoles already have HDMI outputs so you can connect your projector seamlessly and you can also connect the projector to an HDMI or VGA wired computer.

How to choose a projector for corporate or educational use?

For corporate or educational presentations with projectors, it is important to have a good projection resolution, at least at least one WXGA resolution (1280 x 800 pixels) is often used to present texts and graphics in an appropriately readable way.

It should be noted that there is always the
possibility to rent Projectors Full HD
(1920 x 1080 pixels) and WUXGA (1920 x 1200 pixels), which are an even better option for presentation of graphics and videos with better quality.

Because projectors for corporate or educational use are generally used in a luminous environment, it is important to have a projector of at least 3500 ANSI Lumens to achieve a good contrast.

If it is a projector for ceiling installation,it has the automatic keystone correction function,to compensate for the distortion of the projection.

On the contrary, if it is a portable projector, it must be light weight, maximum 3Kg for easy transport. Portable projectors for rent are usually they have an internal speaker to be able to make presentations with audio.

If the projector does not have an internal speaker or the audio of the projector is not sufficient for the number of people or space, an external speaker can also be connected via bluetooth via a minijack connector (3.5mm connector).


Repairing or maintaining a projector

The maintenance or replacement of a projector lamp can cost from 35 to 350 euros depending on the power and characteristics of the projector.

Generally the lamp life of a projector is 2000 to 4000 hours and in the case of portable projectors it is much less, between 1000 and 1500 hours.

If you want to make an investment of cheap projectors in terms of purchase and maintenance, the best option would be LED projectors or hybrid projectors (Laser – LED).

In many cases, this information may change slightly, depending on the type
of projector, according to some experts in projector forums, with the most current
projectors can last up to 10,000 and 20,000.


To install or locate a projector correctly, the projector distance or projection
screen size must be calculated,
but also on the other hand you have to choose a good projector taking into account the optimal distance between the viewer and the projection screen.

To know which projector to choose according to the resolution and distance to the viewer, the following calculations must be taken into account:

  • For a projector with Resolution… Distance x screen width x 1.8
  • For a projector with Full HD Resolution… Distance x screen width x 1.5
  • For a projector with 4K resolution… Distance – screen width x 1
Calculate projector projection distance


There are a lot of brands of projectors and projectors for audiovisual services, but it is always better to opt for recognized and high-end brands.

Some of the best brands that we can recommend you, with which we have worked, both for the purchase and rental of projectors and projection screens, are the following: Epson, Optoma, Acer, LG, Panasonic and Sony.