1. What is a projector?

A lot of people ask the question what is a projector? Projector is a device that is capable of emitting light with great power. It goes through an intermediate processing system and creates the image on the blackout curtain. We can observe those images with our eyes on the big screen. Projectors are universally used everywhere. You can see projectors in restaurants, offices or cafes, ..

2. Popular types of projectors

What is a projector? What types of projectors are there? This issue is well understood by many people. There are many projectors on the market today with many different functions. However, there are 6 popular types of projectors that are commonly known by many people.

Hitachi brand projectors: This series of projectors has a sophisticated design. VGA standard resolution. The brightness of the device is 2700 Ansi lumens. Even in low-light environments, the image quality of the device is still clear. You can use Hitachi projectors for school, company or office.

Viewsonic projector: This is a line of DLP technology projectors. The brightness of the Viewsonic projector is 3300 Ansi lumens. The machine usually has a compact design, white color and has HD 3D, K + for connection. Viewsonic projectors are used for entertainment and office projection

Epson projectors: This is a modern technology projector with a luxurious and compact design. The machine can show movies, serve for households or business activities. The machine has a variety of data connection ports. In addition, Epson projectors have a long and long lamp life.

Optoma projector: This is a new generation of DLP projectors. It helps to present the most vivid and realistic images.

Panasonic projectors: The prestigious projector line of this leading Japanese electronic brand is loved by many people. Panasonic is a company specializing in projectors for businesses, offices, movie halls with large capacity

BenQ projector: This type of projector is used in many academies and lecture halls at a not-so-expensive price. With only about 7 million, you can own a BenQ projector.

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1. What is a projector?

A projector is a device that transmits images from a signal source (computer, laptop, mobile phone) through a number of intermediate processing parts to create an image on a large blackout screen.

Projectors are commonly used in fields such as education (projecting teaching content), business (meetings, presentations) and entertainment (projecting movies, tv, karaoke… on the big screen).

2. Projector construction

Projector structure consists of 7 parts: Projector lens, dichroic prism, dichroic mirror, LCD panel, projector lamp, integrated lighting system and power supply.

Projection lens

The projection lens is mounted in front of the projector lamp to prevent dust from adhering to the image quality and causing rapid damage to the processor. When there is a projection lens, dust will not affect focusing because it can only stick to the outside of the projector.

Dichroic prism

Dichroic prisms are responsible for dividing light into red, green, and blue. A color image will be created from the proportional mixing of these three colors according to the LCD panel (HTPS). Colors and images are represented on the projection screen by reflecting red and blue light and transmitting blue light.

Dichroic mirror

Two dichroic mirrors are used in 3LCD systems to divide the light from the lamp into red, green, and blue. These two mirrors are covered with a thin film that only reflects light of a specific wavelength.

LCD panel

LCD panel – HTPS stands for High temperature Poly-Silicon, is an LCD screen that transmits signal pixels. LCD panel is smaller in size, for higher resolution and contrast.

Projection bulb

The ultra-high pressure mercury lamp is used as the projector’s light source because of its outstanding efficiency and lighting time. By setting the lamp operating pressure to more than 200 atms, the light source radius is reduced, resulting in a clearer image.

Lens system to magnify the image

The projector can enlarge the image from the size shown on the computer screen, laptop to a large image on the projection screen by transmitting light evenly from the first lens piece to the second lens piece.

Power adapter

When the projector is in operation, a power converter is required from the power source to the projector lamp, controller and fan.
3. Note when choosing to buy a projector – Brightness and contrast: The higher the brightness and contrast, the clearer the image in bright environments. – Resolution: Resolution is the ability to present sharp images on a large screen. The higher the resolution, the sharper the image when projected on the big screen. – Projector lamp life: The longer the projector lamp is used, the lower the luminous intensity will make the projected image blurry and you have to replace the projector lamp. The longer the lamp life, the more money you save. – Ability to support a variety of connections: The more the projector structure supports many connection ports such as USB, HDMI, VGA, the more flexible and easy you use it. How to connect signal wire

– Determine how many signal inputs the projector has. Usually the machine will have ports such as Video; S-Video; VGA IN; HDMI.

– Plug the signal wires to connect to the machine.

– Use keys such as INPUT/SOURCE on the projector or on the controller to select the connection port.

Make a projector power connection

– At a voltage of about 100-240V AC, the projector can work well. However, you need to make sure the power source is stable.

Align the projected image on the projection screen

– Use the ZOOM button to zoom in or out of the image

– FOCUS button: this is the button to align the image sharpness

– To adjust the image up or down, you can use the projector stand.

– Use the projector’s KEYSTONE function to correct if the projected image is trapezoidal. You can use this function displayed on the menu or in the remote.

How to turn on the projector

-You open the projector lamp cover then turn on the power switch behind. Continue pressing POWER.

– If you have just turned off the projector and want to turn it back on, you should wait for the fan to stop spinning. Only then should you turn it back on.

How to turn off the projector properly

– You only need to press the POWER button twice to turn off the projector.

-With some newer projectors and later, just press POWER once.

-Note that the fan should stop completely before unplugging the cord from the power source.

It is recommended to let the projector turn off for 5 minutes before unplugging the power cord. This will help the machine last a lot longer.

Thus, this article has helped you answer the problem of what a projector is. In addition, you also know more about the types of projectors on the market today and how to use them. Hope you will choose for yourself the right projector.
As projectors become more and more popular, projectors with different technologies, structures, buttons, and controls also make many people feel confused. In fact, no matter what type of projector, when using it, it needs to go through the following 5 basic steps: Connecting projectors and devices Most projectors have a VGA cable (the type with the same two ends) to plug in both the projector and the connected device. Normally, VGA cable will have 2 screws to help fix the connection, you just need to plug it in and fix it with screws. In addition to the VGA cable, projectors often have HDMI/S-Video/Composite/Video ports, depending on the model. A small note is that each of these connections will give you different video quality. S-Video connector, Composite Video for pretty good video quality, HDMI connector is best, but not all projectors have this jack.

When plugging in the cable, you should hold the plug to push it firmly into the slot, avoiding loose plugs that are easy to lose connection during projection. When unplugging the cord, it is necessary to grasp the cable end and pull it straight, do not shake it back and forth, do not grasp the wire to pull because it is easy to damage the cable.
Install the projector and plug it in

When plugging in the projector, you should choose an outlet that fits the power plug, don’t let it loose because if it accidentally crashes, it will turn off suddenly during operation, it will damage the machine very quickly. The projector works well at voltages of 100-240V and is extremely sensitive if the voltage is unstable. If the power supply is not stable, the circuit board and projector lamp will be very damaged. You should carefully review how to use the projector in the manual (with pictures) or use UPS power for the projector.

Turn on the projector

Open the lamp cover if present, if there is a power switch behind the projector, turn it on, then press the Power button once. Note that when the power is turned off, the cooling fan still works to cool the machine. Avoid the case of continuous on and off, but have to wait until the LED next to the power button shows green NOT blinking before being turned on again.

Adjust the picture

If the image is skewed, tilted, blurred, too big or too small, you can use the command buttons on the camera body (or the remote if the machine has a remote control mode) to adjust it to best suit your needs. .

In there:

TILT button: Raise or lower the spotlight

FOCUS button: Adjust the sharpness of the image

ZOOM button: Zoom in/out the image

FOCUS button: To adjust the sharpness of the image (Some projector models always leave Auto Focus).

In addition, adjusting the projector body (if not fixed) or the projection screen to get the desired image is also an effective way to adjust the projector.


To power off the projector, you press the Power button, a dialog box says “power off?” will be displayed on the screen. Next, press the Power button again to confirm the power off. You should not unplug the power while the machine is still in the cooling process, this will have a bad effect and will shorten the lamp life.