What is Projector and how does it work?

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What is Projector ? All of you might have seen projector being used in your class, or in any government function, nowadays people use projector even in weddings, to refresh old memories. But do you know what is this video projector?

How does this projector work? What are its different types? If you want to know the simple answer to all these questions, then read this article till the end today. Because today we are going to share all the information about Projector with you.

Gone are the days when blackboards used to be installed in the classrooms, in which they were filled with quotations, maths equations and science diagrams. Teachers were required to write repeatedly using chalks to explain a concept.

By getting more time, students can ask all their doubts. That’s why today I thought why not you should be given information about what is a projector so that it will be easy for you to understand it. So without delay let’s start.

What is Projector?

What is Projector and how does it work?
What is Projector and how does it work? 6

A projector is an optical device that projects an image or video onto a surface called a projection screen.

A projector is an optical device that projects an image or moving images onto a surface, which is primarily a projection screen. The most common type of projector in today’s time is the video projector.

definition of projector

Projector is an output device of computer through which any type of image or video is shown on white screen or wall.

Projector is used to explain the image or video in detail. The image or video displayed on the screen through the projector can be arranged by the user according to himself.

What does projector mean?

Projector means projector Understand in simple language, then any device that projects an image (static or moving) on ​​a surface is called a projector or a projector.

Who invented the projector and when?

Projectors were invented by Charles Francis Jenkins in 1894 .

There is no similarity between today’s projectors and old projectors. Where in the earlier original models light was blasted through celluloid film and images and sounds were stringed together using some techniques that are not even used anymore.

Modern projectors have a lot of complexity in both design and implementation, many different core technologies are used in it, which provides a wide range to a prospective buyer.

Projector Type

There are many types of Projectors but three of them are the most important.

1. DLP
2. LCD
3. CRT

What is DLP Projection?

DLP technology is based on an optical semiconductor called a DMD chip (Digital Micro mirror Device), which was invented by Texas Instruments in 1987 . A DMD Chip is made of millions of tiny mirrors, which rotate in 10 degree angle (in better models it is also 12 degree).

In a DMD chip, shaders are often additional and are controlled using shader controls. These are such controls in which they rotate in a complete round, which can range from about 150x each second to 250x or even more.

Many affordable products can be made using several message shade controls. It can be either Red / Green / Blue any color, but often it is a clear message.

What are the advantages of DLP Projector

1) It has Filter-free design.
2) These are Sealed projection systems.
3) There are no problems of failed air filter in it.
4) There are higher contrasts.
5) Less pixilation
6) Lighter and smaller.

What are the Disadvantages of DLP Projector

Rainbow effect can be seen in this, Color wheels sometimes produce rainbow effect. Rainbow effect (also called color separation artifacts), these are momentary flashes of banded color that look completely like rainbows. They occur randomly, and they only last for a few moments.

These problems mostly appear in slower color wheel projectors. These rainbow artifacts problem never appear in 3-DLP chip projectors because 3 single DLP chips technology is used in it.

What is LCD Projector?

What is Projector and how does it work?
What is Projector and how does it work? 7

LCD projector is a type of video projector that is used for displaying video, images and computer data on a screen or other flat surface.

This is the modern version of slide projector or overhead projector.

To display images, LCD ( liquid crystal display ) projectors typically send light from a metal-halide lamp through a prism or a series of dichroic filters that separate that light into three polysilicon panels – In which one for red, second for green and third for blue components of video signal.

Because polarized light passes through these panels (which are a combination of polarizer, LCD panel, and analyzer), individual pixels can be open to allow light in or close to block light.

This combination of open and closed pixels can produce a wide range of colors and shades in the projected image.

What are the advantages of LCD Projectors

1. Higher contrast ratio is in specific projector models.
2. Sharper image is in specific projector models.

What are the Disadvantages of LCD Projectors

1. Having a low contrast ratio, due to the design of the equipment, in which they are equipped with high-quality optics.

2. Are high-weight.

3. Dust blobs are impurities in panels. Therefore, the LCD structure projector must be cleaned after every 300 hours of use.

4. Color decay happens.

5. Limited lifetime Screen-door effect is visible in this, this happens when the lines between the pixels become visible, due to which separate pixels become visible, and these effects become more distracting.

6. Dust issues are very high in this. Due to this dust accumulation, there can be a decrease in contrast ratio up to 50% over time.

7. Having dead pixels. Which you must have heard in LCD Monitors .

What is CRT Projector?

What is Projector and how does it work?
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The full form of CRT is ” Cathode Ray Tube “. This is the largest and most commonly used projector. Many of you must have seen this projector in school’s auditorium, or in Bars. CRT utilizes three tubes, which are also called “guns”. These three colors combine and converge to form an image.

CRTs do not have a fixed number of pixels, which makes them versatile machines capable of producing clear images from higher to lower resolution sources. Operating CRTs requires periodic ‘calibration’ by a trained professional, which is an additional expense for the end user.

These projectors are generally fixed installations because of their size. CRTs are not as bright as other technologies, but the refined picture quality that a properly calibrated CRT provides is hard to beat.

Wherein its parts are more costly, especially those guns have to spend a lot of money to replace them.

What is the Throw Distance of Projector?

The throw distance of a projector is called the distance that is within the image of the projector and the screen (that is, the distance that the image can be “thrown”).

What are Projection Screens?

A projection screen is where the installation consists of a surface and a support structure and which is used to display a projected image that is ultimately viewed by the audience .

Projection screens are either installed permanently, such as in a movie theater, or semi-permanent, such as in a conference room.

There are many varieties of Projection Screen such as digital projectors, movie projectors screen, overhead projectors, slide projectors etc.

But the basic idea in all the screens is the same, which is:  Front projection screens work by diffusely reflecting the light that is projected onto it, while back projection screens work by diffusing the light. By them in transmitting.

Which projector is good to buy?

By the way, there are many varieties of Projector to buy. But there are some better than them with more functions while there are some which do not have many features. So below I have made a list of some of the best projectors that you can buy online if you want.

Which lens is used in the projector?

Convex lens is used in Projector. It is curved outwards from both the sides. This magnifying lens is also actually a convex lens. When light passes through it, then you can get an image on the screen which is very large compared to the object of which this image is. Whereas this image is inverted.

Therefore this inverted video or image is released inside the projector and which is later projected inverted on a screen. That’s why we finally see the image straight.

what is the use of projector in education

What is Projector and how does it work?
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There are many benefits of Projector, but they are mostly used in education, which means they are mostly used in the field of education. Let us know about how they are used.

As we know that the present time is of technology, in such a way almost everyone knows the use of Laptops, Smarthphones and computers.

Wherein, how can the education sector remain behind? Yes friends, to make studies more interesting, projectors and smart boards are now being used in classrooms. Let us know more about their use.

Note-taking can be done in a more efficient way

Earlier, where it was not so easy for children to concentrate on studies and write notes together, now notes are presented in a better interactive way by using projectors. Apart from this, after the end of the class, the teacher can share the e-copy of those notes with the students.

Due to which they get the right notes at the right time, in which the chances of making mistakes are less. Apart from this, children can concentrate more on understanding things where they can do these things in a more focussed manner.

Studies can be made more interactive through presentations that keep students more engaged.

We all know that we remember the story of a movie better than the theory portion of books. There is only one reason for this, that is presentation. In the same way, if concepts are explained through interactive videos, then it is remembered more in children.

Along with this, their interest also increases a lot. Due to this, they remember the studies for a long time.

Lessons can be taught through games

Nowadays there are so many puzzles and quizzes available on the internet that they can be used in the education of children as well. By keeping Education Puzzles in front of the students, their subjects are also remembered and they do not get bored due to the presence of the projector. In this teachers can also discuss or quiz the questions of their subjects.

Can be taught from different range of mediums

Small children do not understand the whole subject. That’s why if the same subject is divided into small pieces, then they remember it more.

In this, turn on the slides that have already been prepared through the projector and after reading a small portion of a subject, its related tasks or exercises can be done in an interactive way. With this, along with studies, the spirit of teamwork will also increase in them.

Classroom time is used correctly

Often there was more wastage of classroom time in the earlier education system. Because teachers had to write notes, after erasing them, they had to write again on some new topics, in such a situation, the doubts of the students could not be cleared. At the same time, after the arrival of projectors, time does not have to be wasted for these unnecessary tasks, so that students can study much better.

Advantages of Projector

Now let us know about the advantages of Projector.

1. Large Image 

Projector helps in projecting a large image. Even at home a projector can provide us with a cinema size screen of up to 120”.

2. convenient and versatile 

Because of Front projection, you can project the image at any angle. Like Projection mapping, a picture can also be drawn on the sand.

3. less space needed 

You can get projection at any place with the help of projector. Projection technology  enables the small size of the projector. Projectors can be made in large sizes and small sizes that weigh less than 5lbs and are portable. They occupy very little space.

4. easy to install 

Many projectors are lightweight. It is easy to unbox and setup them. There are manuals with them, seeing which they can be installed and used. You need to mount a projector and screen.

5. they are cheap 

Projectors are more affordable than TVs. A flat screen HDTV can cost more than a projector, while a projector can produce a larger image than a TV with the same picture quality.


FAQ: Related to What is Projector

Who invented the projector?

The projector was invented by Francis Jenkins and Thomas Armut.

What type of device is a Projector?

Computer Projector is One Optical Device.

What did you learn today?

I hope that I have given you complete information about what a projector is and I hope that you have understood what a projector is.

If you have any doubts regarding this article or you want that there should be some improvement in it, then for this you can write low comments. With these thoughts of yours, we will get a chance to learn something and improve something.

If you have got to learn something from my article What is Video Projector in Hindi, then please share this post on social networks such as Facebook, Twitter etc. to show your happiness and eagerness.

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