Projector - Introduction, Types And Works

A projector is an output device that is capable of connecting to a computer, which may be an other option for a monitor or television in terms of displaying pictures to a large number of people. It takes images generated by a Blu-ray player or a computer and projects them onto a large surface like a wall or white screen. Projectors come in many shapes and sizes and are used in conditions like a classroom, home cinemas, office training or presentation sessions, etc. The projector looks like the below picture.

Projectors can be used for displaying pictures or videos on the front or rear. The screen is the difference between both types of projection, which is semi-transparent grey for rear projection and non-transparent white for front projection. In the front projection, the pictures are sent to the front of the screen from the audience. This process does not need an empty space back side of the screen; therefore, this process is most common.

In the rear projection, the pictures are sent from behind the screen toward the audience. This method provides better contrast as compared to front projection and is less affected by ambient light. Commonly rear projection is used in commercial areas where more space is available and also used in outdoor settings.

Types of Projector

The LCD (liquid crystal display) and DLP (digital light processing) are two common types of projectors. However, CRT (cathode ray tube) projector is another type of projector, which was popular in the earlier times of projectors. In modern times, CRT projectors are no longer in use; because they provided low light output and came in a large size.

Cathode Ray Tube (CRT)

A CRT, which stands for Cathode Ray Tube projector, is a video projecting device that uses a cathode ray tube (which is small and high-brightness) as the image generating element. A Lens is kept in front of the CRT face through which the image is focused and enlarged onto a screen. In the early 1950s, color CRT projectors came on the market for the first time. Instead of a single-color CRT, most of the modern CRT projectors have colored (red, green, and blue) CRT tubes and their own lenses to generate color images and commonly come with color features. An example picture of a CRT projector is given below.

CRT projectors are not commonly in use today, as they consume high electricity and are heavy in weight, and large in size. Also, they are not portable. Although according to users, the picture quality of CRT projectors is brilliant, it may be tricky and difficult to set up a CRT projector at the initial stage. As compared to newer technologies, the projectors are capable of compatible with new improvements; hence, they are nevertheless.

Liquid Crystal Display (LCD)

An LCD projector is a type of projector based on liquid crystal displays, which is widely used in business seminars, presentations, and meetings. They utilize liquid crystal to display images, data or video, and function on trans missive technology.

LCD projectors have excellent color reproduction and are cheaper to produce, which makes them more popular as compared to many alternatives.

Generally, these kinds of display panels are used in many devices, such as cell phones, portable video games, Laptops, computers, and TVs. Comparing with CRT technology, the display in LCD technology is much thinner. The below picture represents how looks an LCD projector.

Digital Light Processing (DLP)

DLP projectors are utilized for front and back projection units and can be classified as one-chip or three-chip. Over 16 million colors can be produced by one-chip DLP projectors, whereas more than 35 trillion colors can be produced by three-chip models, which makes the projector capable of providing more lifelike and natural images. It is used in organizations and classrooms in terms of front projectors and also utilized for back projection in TVs. The below image is an example of a DLP projector.

How a Projector Works

A projector works with the help of a small transparent lens. There are various technologies available that can display the images or objects from your source media, like using lasers rather than LEDs.

The LCD projector was the projector type that was dominated by projectors primarily used for computer monitor mirroring and business presentations. Due to the tech became more common and available, they were also commonly used as television alternatives. Now, you have prism-like Digital Light Processing (DLP), mirror-based projectors, including the LCD/DLP hybrid projectors, which combine DLP prisms and LCD tech together.

What to look for in a Projector?

When you are planning to buy a projector, you need to consider your specific goals or applications and the price that you can afford. Mainly, determining your budget is the best bet to buy a project. Also, you can adjust things according to your requirements, whether you need a low-latency projector for online first-person shooter gaming purposes or you are willing to torrent for a particular type of projector. Your personal preferences and financial circumstances should work to get you the right projector.

Uses for Projectors

Actually, the applications of a projector depend on the projector type you have. Generally, projectors can be used to project video, slides, and images onto a screen and also used in business meetings, conferences, classrooms, and churches for presentation. There are various kinds of projectors; some of them can be used for different purposes, and even one projector can be used for some other objectives. For example, mostly the use of a video projector is not uncommon, which is usually used in home theaters. The main applications of projectors used in daily life are given below:

Educational and Classroom
Home Theater:
Advertising and Art Installation:

Theory -25 :- How Projector Works?

Projector - Introduction, Types And Works