What is Projector

What is Projector

What is Projector
What is Projector

What is Projector:- Projector is an output device that projects an image onto a large surface, such as a white screen or wall. It can be used as an alternative to a monitor or television to show video or images to a large group of people.

What is Projector?

What is Projector? The projector can be used to give lectures and presentations to large groups, as well as to watch movies and other videos in-home theatre. They can be found in a variety of environments in classrooms, conference rooms, and homes.

Projectors come in a variety of sizes and capacities, from handheld devices that require dark rooms to provide viewable images to easy-to-read high-power devices, even That too in offices.

Projectors come in many shapes and sizes, although they are usually about a foot long and wide and a few inches tall. They can be mounted on the ceiling or they can be freestanding and portable. Ceiling mounted projectors are generally larger, especially those that project long distances (such as 30 feet or more). These projectors are commonly found in classrooms, conference rooms, auditoriums, and places of worship.

Portable projectors are used where there is a bright surface (such as a white or light coloured wall). Most projectors have multiple input sources, such as an HDMI port for newer devices and a VGA port for older devices. Some projectors also support Wi-Fi and Bluetooth.

Uses of Projector in English

What is Projector-How are projectors used today?

Below is a list of the different ways Projector is used today.

  • To project a PowerPoint presentation at a business meeting.
  • To project a computer screen to teach in a school classroom.
  • A TV Or a computer to project a movie on a larger screen.
  • To show a demo of a product or service in a convention centre.
  • Wall, house or wall for different appearance To transform another object.

Uses for Your Projector that May Surprise You

The uses of Projector are not only this, there are many other uses as well which may surprise you-

We all know the “regular” use of projectors. We have used them in classrooms and conference rooms. We are sitting in dark cinemas while our favourite movies were projected on the big screen. Now, it is becoming common to use them in our homes for entertainment as well. We can play multiplayer video games on the big screen. We can watch our favourite movies and TV shows in High Definition and 3D.

Now the projector has become such that we can put it in our pocket while travelling. Technology has evolved to the point where it’s not uncommon to own a projector. The surprising thing might be that you can use a fun projector in your home.

Laser Show:

A fun way to make a party osm for kids or adults is to create your own laser show in your living room! Download a laser show app, such as MusicBeam, and connect your computer to the projector. The app will turn into a laser show for your music.

Stencil/Wall Mural:

Looking for a fun project on a rainy day? Project the desired image on your wall. You can use the project to make some great murals on your wall.


Build your own planetarium in your home by downloading some free software or apps. Celestia is a program that will turn your room into a galaxy. You can see stars and planets in 3D. Projected on your screen, you can have the experience of travelling in space. Stellarium is an app that is used in planetariums around the world.

History of Projector in English

When was the first projector invented?

The first carousel slide projector was patented on May 11, 1965, by a man named David Hansen. The digital projector we know today was created by Jean Dolgoff in 1984, although he came up with the concept for it in 1968.

Types of Projectors

There are many makes and models of projectors on the market these days, and projectors can be purchased at electronics retailer shops or speciality stores that deal in cameras and projection devices. Along with this, you can also shop online from Amazon or eBay.

There are generally three types of projectors – DLP, LCD, and LED projectors.

Before buying a projector, you should know the difference between these three. Knowing how the technology works along with these projectors is essential in order to buy the right projector.

DLP, LCD, and LED Technology

The technology used in projectors can generally be divided into two types: transmissive or reflective.

Since LCD projectors pass light through the LCD panels instead of bouncing them off, they are considered a transmissive medium. A DLP projector uses a mirror to direct light into an image, so it is considered reflective. The third type of projector is an LED projector named for the light source, not the type of projection technology.

1) DLP Projectors in English:

How DLP Projectors Work

DLP projectors first appeared on the market in the 1980s, and they rely primarily on a DLP chip (called a Digital Micromirror Device, or DMD) consisting of 2 million tiny mirrors the width of which Equal to one-fifth of a human hair.

Each mirror in this chip is capable of making independent adjustments, moving away from or near the light source to create dark or light pixels. At this point, however, the image is in grayscale. Colour is given by DMD light which passes through a spinning colour cycle before reaching the chip. Each segment of the colour wheel provides a colour. The basic colour wheels support red, blue and green, while the more advanced colour wheels support cyan, magenta and yellow.

Although these chips can produce up to 16.7 million colours, a DMD Project with a three-chip architecture can produce 35 trillion colours. After reaching the colour DMD, the image is projected through the lens onto the projection screen.

2) LCD Projectors in English:

How LCD Projectors Work

LCD projectors have also been around since the 1980s, and use the same liquid crystal displays that create images in watches and other electronic devices.

Specifically, most LCD projectors use 3 LCD technology, a patented system that combines three liquid crystal displays. In a multistep process, an image is created with a light source that provides a beam of white light. White light is passed to three mirrors, called dichroic mirrors, which are specially shaped to reflect only a certain wavelength.

In this case, the mirrors reflect the red, blue, and green wavelengths. A colour light beam is released by the LCD panel so that the image can be made. All three LCD panels produce the same image, but their hues are different, as the colour light passes through the panel. Later these are combined in a prism to make a single image. This image can be up to 16.7 million colours, which are projected on the screen by passing the lens.

3) LED Projectors in English:

How LED Projectors Work

LED projectors are not used by display technology, but by light.

In fact, some DLP projectors with “solid-state illumination” technology are actually LED projectors. Another type of projector, the pico projector, typically also uses LED technology. Pico projectors are essentially handheld devices that use LCoS, or liquid crystal on silicon, which is similar to an LED panel but reflective rather than transmissive. In these cases, the projector colours traditional lamps with longer-lasting and more efficient red, green and blue LEDs.

Beyond the technology used, however, there are other important differences as well. LCD projectors are generally less expensive for smaller screens such as home theatres. They also give the user the advantage of longer throw distance and greater zoom capability, both of which are lacking in many DLP projectors. This makes the LCD projector ideal for larger environments. However, DLP projectors do not have the colour loss that LCD projectors do and are easy to maintain due to their filter-free design.

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