What is a projector? Pros and cons of projectors

A projector is a device that supports the projection of images onto a larger screen, meeting a large number of viewers. In this article, let’s find out what are the advantages and disadvantages of projectors with Tnhelearning.edu.vn as well as other information related to projectors!

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What is a projector?

Projector, known in English as a projector, is a device used to transmit images on a bright white screen (also known as a projection screen) with a large screen size and can be customized according to user preferences.

Projector construction

Most projectors include the following basic components:

• Projection lens : Mounted in front of the projector lamp prevents dust from sticking to the processor and affecting the quality of the displayed image.
• Dichroic prism part : Responsible for dividing light into green, red and blue bands, processed by the LCD panel (HTPS) to reproduce images and displayed colors.
• Dichroic mirror : Coated with a thin film that only reflects light of a certain wavelength, including 2 dichroic mirrors used in 3LCD systems to help divide the lamp light into green, red and blue.
• LCD panel : As an LCD display that transmits pixel signals, the smaller the screen size, the higher the resolution and contrast.
• Image Projector Lamp : This is the projector’s light source with lamp operating pressure reaching 200 ATM with intense illumination time, thereby delivering a clearer image on the projection screen.
• Image Enlargement System : Helps transmit light evenly from the 1st lens to the 2nd lens, so that the image from the computer screen can be magnified to the projector screen with a larger size.
• Power converter : This is the part responsible for converting power between the power source and the lamp, between the projector controller and the fan.

Projector working principle

The projector uses a special chip – it is capable of converting RGB signals from digital images into beams of light that are focused on the projection screen to display a color image.

That is, the color group from the video signal will be received and processed into 3 colors Red, Green and Blue (referred to as RGB), then projected onto the screen with different colors but still ensuring color quality. Vivid and realistic colors.

Uses of projectors

Here are the outstanding uses of projectors for users:

• Support for presentations and information exchange on large screens with large numbers of followers in meetings.
• Support for teachers to convey a lot of knowledge content with vivid images and videos, making the lesson more interesting.
• Help presenters feel more confident and present professionally.
• Expanding entertainment methods for students, staff, etc. with large screens in activities, exchanges and entertainment.
• Support product presentations, advertising, etc.

Advantages and disadvantages of projectors

Like other electronic devices, projectors also possess the following pros and cons:

Advantages of projectors

• The screen size is easy to customize according to the needs of use. Moreover, the projector can project on many surfaces, but it is best to have a flat surface with a white background to make the image display as good as possible.
• Bringing comfort to the eyes when looking at, thanks to the size of the projection screen many times larger than that of television.
• Compact projector design, easy to carry around or store conveniently after each use.
• Highly portable and easy to install from one location to another, or from one department to another.

Disadvantages of projectors

• It may be difficult to connect lines and devices if you are using the projector for the first time.
• May cause eye damage if overused or improperly used projector.
• The cost of projectors is quite high , especially those with many technologies and high resolutions.
• There may be a connection error in case the device is incompatible or not supported on some connection ports between the projector and other mobile devices (such as laptops, computers, …).

Classification of projectors on the market

In the market, you can come across many types of projectors to meet the needs and economic conditions of each customer that the manufacturer wants to target. For example, you can categorize projectors into the following groups:

• According to the projector’s connectivity : There are 3 types of compact portable projectors, projectors connected to desktop computers, projectors connected to laptops and projectors connected to wifi (connected to devices). peripheral via wifi signal).
• According to projector use : There are 6 types of projectors at home, office projectors, outdoor projectors, school projectors, cinema projectors and hall projectors.
• By projector technology : There are 4 types of projectors using LCD technology (RGB color-based), DLP technology projectors (mirror), LED technology projectors and laser technology projectors.
• According to projector resolution : There are 7 types which are 4K projector, Full HD projector, 2K projector, HD projector, XGA projector, WVGA projector and UXGA projector.
• According to projector placement : There are two types of projectors: wall-mounted projectors and ceiling-mounted projectors.
• According to projector capacity : There are 2 types : mini portable projectors (usually used for home, travel) and large capacity projectors (used for events, conferences, and teaching).
• According to projector structure : There are 2 types : multi-object projectors (used for professional projection in scientific research, medicine, exhibitions, …) and intangible projectors (used for document presentation). related to pictures, books, 3D objects, etc.).

Projector selection criteria

It can be said that depending on the economic conditions and the purpose of use, you choose the projector accordingly. Here are some suggested criteria that you can refer to:

Resolution

Resolution is the total number of pixels of the projected image, consisting of many pixels that are placed next to each other and are difficult to see with the naked eye. You can select the projector according to the following resolutions:

• 4K projector : The resolution of 3840 x 2160 pixels , helps to display sharp, vivid and bright images, avoiding image breakage and blur when projected on a large projection screen.
• Full HD projector : Resolution 1920 x 1080 pixels or more, the displayed image is quite detailed, relatively clear with more than 2 million pixels. In addition, this projector can support HD image quality to Full HD.
• 2K projector : Resolution is approximately 2000 pixels , usually projectors with this resolution are rarely used today.
• HD projector : Resolution from 1024 x 768 pixels or more, the displayed image is relatively stable.
• XGA projector : Resolution is about 1024 x 768 pixels , making reflected images and videos clear and true.
• WVGA projector : Resolution is about 850 x 480 pixels , large enough to project a 16:4 frame and deliver the most optimal image when displayed.
• UXGA projector : Very high resolution, so it gives outstandingly detailed and sharp images, this machine is very rarely sold in the market.

Contrast

Contrast is the ratio of light between the darkest and brightest areas of the screen, showing the difference between two colors – white and black to assist in displaying detailed images. You can balance this parameter through 2 types: static contrast and dynamic contrast of the projector when choosing to buy.

In addition, projector brightness is equally important, measured in ANSI lumens. The higher this index, the brighter the projector, you should choose a brightness of about 650 – 5000 lumens .

Connect ability

Depending on the type of projector connection, you can choose one of the following three types:

• Portable projector : Compact size, convenient to carry with you and has the ability to connect wirelessly to your phone.
• Desktop-connected projectors : Usually larger in size than portable projectors and are permanently installed. The projector can be connected to a desktop computer via HDMI port, VGA port, composite (AV) port, LAN port, etc.
• Wifi projector : Like other projectors, but with additional support for wifi connection.

The age of the light

The lamp is an important part of the projector, because it is the main light source for the device to operate. The longer the lamp life, the less expensive it is to replace, because the cost of the lamp can account for about 30 – 50% of the value of the projector.

Trademark

You can easily find major brands of projectors on the market such as Samsung, ViewSonic, GIMI, Panasonic, Sony, Epson, etc. with warranty and promotion policies depending on the time of purchase.

Tnhelearning.edu.vn and Mobile World are also one of the big, reputable stores for you to buy genuine projectors at the best prices on the market.

Port, connection cable

When choosing to buy a projector, you should also learn about the connection ports for ease of use, to avoid the incompatibility of the connection ports between devices that cost money to buy.

Moreover, the connection cable between the ports is also very important, it is responsible for improving the image and sound quality displayed on the projection screen. For example:

• The DVI port cable is capable of transmitting clear video signals, but an additional audio cable is required to support it.
• The HDMI cable is capable of displaying extremely high-definition images and ensuring a stable signal transmission.

With the above sharing, hope you have a better understanding of what a projector is as well as the advantages and disadvantages of projectors if you have a need to choose to buy in the near future!