How Do Projectors Work?

Introduction

Some new inventions have changed the way people live. Similarly, the new types of projectors from a few decades ago have changed our lifestyle significantly. For example, watching a movie on the big screen even a few years ago meant cinema hall or cineplex. Anyone couldn't even think of a slide presentation in the office. And students could not take any live experience in educational institutions.

But now, with the help of all modern projectors, we have built our own theater. Slide presentations are a daily occurrence in offices. Students can now see the real images of the elements of their book. An animated video can students watched by the projector.

But have you ever thought about how these modern projectors work? Maybe yes. It is not a very complex system of the working process of a projector. Let us know today about the working of the projector.

What Is A Projector?

Before we know how a projector works, let's not know what a projector is. Maybe many of us know a little bit about projectors. And projectors are in everyone's house and office. Almost everyone uses a projector for different needs.

A projector is also called an image projector or video projector. Actually, the projector is such an optical electronics device that projects an image or moving images onto a surface, mostly a projection screen.

Basically, projectors create a reflex of an image by shining a light through a tiny lens. But some newer versions of projectors can project the image directly using lasers. Now there are many types of updated projectors available.

How Do A Projector Work?

You should know what a projector is before understanding the theory and working of a Projector. A projector is actually an optical device that displays an image, video, or figure onto a surface. Usually, a white projection screen or clean white surface uses to display those figures.

If we think more about a projector, then we talk about its working system. Put an image or object in front of a light source. A dim figure of the object can be seen on the display screen or projection screen.

A projector generally adopts the operational principle of image projection. The projector has an inbuilt optical projection system consisting of a light source and lens. The projectors receive an image or video input and process it with the inbuilt system. It projects the enhanced output on the big projection screen.

There are now many types of projectors available. But three types of the projector are the actual projection devices. So here we will discuss about the LCD and DLP projectors. To know more, you can take a look at the Latest Projector Guide .

LCD Projector

There are many kinds of projectors we have been using in the past. But the LCD projector is one of the best projectors. Due to excellent services, we will primarily focus on LCD and DLP projectors. By today's standards, LCD projectors look outdated.

Firstly, you should know about the light beam to understand an LCD projector. Let's begin from the point where the light beam itself starts. The first is to create an acute beam of white light. Then the beam of light is reflected off a series of mirrors, including two dichroic mirrors.

The first panel of the LCD projector displays the image. The image is split up into its basic colors through a group of mirrors. Once the light, often provided by a replaceable projector light, is separated, it's passed through the second LCD panel, which recombines the colors by splitting the light into spectra depending on what will be reflected and what's allowed to get through.

Each panel shines a different color, either red, green, or blue, and sends them through the final LCD panel, which bends the light depending on the level of electrical current.

The dichroic mirrors have a special coating that only reflects the light of one type of wave. The white light directly hits the mirrors, reflecting a blue, red, or green light beam.

DLP Projector

On the other hand, DLP, or Digital Light Processing projectors, rely on what's known as a DMD chip. These "Digital Micromirror Devices" string together millions of tiny little mirrors on a single chip, each measuring less than a 1/5th of a human hair across.

DLP projectors are the best replacement for LCD projectors. The Texas Instruments scientist Dr. Larry. J Hornbeck developed the DLP projector in the decade of 1980. DLP technology is structured on a microchip known as the digital micromirror device or DMD.

Usually, a DMD is a chip containing nearly two million tiny mirrors in a square grid. These mirrors are small -they are one-fifth the diameter of human hair! It is placed on a microscope responsible for tilting the mirror mounted on it one way or the other.

There is an electronic circuit to help decide each mirror's orientation. A bright light source has then glowed on the DMD, and the electronic circuit individually slopes each mirror back and forth.

If a mirror is sloped toward the light, it glows the light towards the projection screen. One mirror represents one pixel. If a mirror is bent away from the light, it cannot reflect the bright light, leaving the screen space dark or empty.

Now, let's learn how the color is formed on the image. The DLP projector uses extra technology. A colored wheel is placed in the way of the light reflected by the mirrors of the DMD chip. Red, blue and green colors are on the wheel.The multi-color combination bounces onto the mirror and rises to endless various colors in high definition. A lens finally took all the beams of light and displayed the image.

Conclusion

We always buy and use ready projectors. But we are not usually aware of its workings. However, through this article, we have given you a clear idea about the projector and how it works, which may come in your need.Then bring the projector of your choice home without delay and enjoy the blockbuster movies. And use in offices and educational institutions as needed.