We must take into account both the devices that we are going
to connect to the projector and those that we can connect in the future, to
make sure that our projector has all the necessary connections. The main ones
to consider are:
VGA and S-Video: These analog technologies are
increasingly obsolete. Anyway, the VGA connection is still used in some
computers a few years ago, so it would not be a bad idea to have it, although
we will always get better quality with digital connections.
HDMI and DVI: They are the main channels of
transmission of video and digital audio (or analog in the case of the old
DVI-A). The HDMI connector is the most frequent and the one that allows the
most information to be transmitted, which is why it is the one that will
provide us with the highest quality, especially at high resolutions.
Audio:
Although most projectors have built-in speakers, the sound usually
leaves a lot to be desired, and it is always advisable to connect some speakers
to the composite audio input or 3.5mm Jack input.
USB: The USB port is a projector can have different
functions, but it will always be interesting that our device has it.
USB Type B: It can act as a substitute for HDMI or DVI to
take video from another device with a USB cable.
USB Dongle: Used to connect a wireless card to our
projector and connect it to a Wi-Fi network.
USB for pen drive: It is a very interesting option
since without relying on any other device such as laptops or desktop computers,
we can directly reproduce the content that we have in the Pendrive in the
projector, without more cables or connections.
Projector functions:
As always, depending on the use we are going to give you, we must take
into account the extra functions that our projector must have:
Lens shift: It is of great importance since it moves
the lens vertically and horizontally without distorting the image to center it
without the need to place the projector directly in front of the projection
screen.
Optical zoom:
It gives us more flexibility when it comes to finding the right distance
from the projector to the projection screen.
Keystone correction or trapezoidal correction: Factors of great importance to correct the
deformations of the image due to the inclination of the projector or when the
surface on which we are projecting the image.
Smart smoothing: The
video projector is responsible for introducing more frames in images with
faster movement, such as action scenes, to soften the image.
Projector
technology
As regards the 200 dollar projector method, there are mainly these 5
technologies. Let's see in a simple way the pros and cons of each one.
DLP
Projectors (Digital Light Processing)
This technology consists of millions of mirrors that project
light onto a screen. It occupies very little space and is usually used in
smaller devices and requires little maintenance. (Ideal for corporate scope)
Pros:
Durability
High Contrast
The vision of texts is very clear.
Cons:
Less accurate colors
Eventually, light flashes of colors are seen.
LCD projectors
(Liquid Crystal Display)
This technology divides white light into the 3 primary
colors, blue-green and red, and passes through 3 LCD screens. (Ideal for home
theater)
Pros:
Great image quality
Huge fidelity of colors.
The image is brighter than with DLP.
Cons:
It requires cleaning the dust filters from time to time
We can see grid effect (lines that separate each pixel)
LCoS
Projectors (Liquid Crystal on Silicon)
Operation very similar to LCD. In this case, instead of
allowing light to pass through, the panels reflect it (as in DLP projectors).
(Ideal for home theater)
Pros:
Higher resolution
Contrast and no grid effect.
Cons:
They tend to have smaller amounts of lumens
Its price is higher.
LED
(Light Emitting Diode)
LED projectors without simply a light emitting diode formed
by two semiconductors that convert electrical energy into light energy.
Pros:
They do not need hardly maintenance.
They deliver a uniform light throughout their useful life.
They are economical
Great durability: 20,000h
Instant power off and on.
Small size
Cons:
Currently, they are more expensive than LCD.
They are more sensitive to voltage variations.
Laser
Projector
It is the latest technology and comes to solve the
shortcomings of the other systems. It is the one that gives us the highest
quality, but it is also the one with the highest price.
Pros:
Concentrate light better.
They emit less heat and consume less energy
Improves brightness intensity and color saturation
Similar life to LED: 20,000h.
Instant power off and on.
Cons:
Price more expensive.
Home
theater projector
If we want a projector to enjoy football matches with
friends, we are movie lovers and series or we want to enjoy video games to the
fullest we should look for a projector with the following characteristics:
Resolution between Full HD (1920 × 1080) and Ultra HD or 4K
(3840 × 2160) would be the best option. Every day there is a more content 4K
resolution, so if we can stretch our budget a bit, this would be the best
option.
3D function: If we are not going to see 3D content,
this function is indifferent, although almost all medium-high range projectors
tend to incorporate it.
Contrast: a
ratio of 5000: 1 will be sufficient in most cases. If you have more, even
better.
Luminosity: We
should try to buy a projector with at least 3000 lumens. If we are going to use
it mainly at night or in a dark room, with 1500 - 2000 lumens it may be enough.
Noise: lower than 30 dBs.
Projector
for corporate or educational scope
If what we are looking for is a projector for a more
professional or educational use we should look for something with
characteristics similar to the following:
Resolution:
the highest resolution is WUXGA, followed by WXGA. They are the most
common and are more than enough for this type of use.
3D function: In the professional or educational
field, the 3D function is not usually used, although almost all medium-high
range projectors usually incorporate it.
Contrast: a
ratio of 5000: 1 will be sufficient in most cases. If you have more, even
better.
Luminosity:
Given in these areas are usually used in large rooms and we can not
always regulate the lighting, especially the natural, it would be advisable
that the projector had 4000 lumens or
more.
Noise: lower than 30 dBs.
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