How Projector Works – Types, Uses, Advantages, Disadvantages

how work Projector

How Projector Works: Offices, schools, and institutions are all now equipped with projectors. A presentation would be impossible without a projector. Projectors are almost always present in presentation halls.

In this post, we’ll look at about how projector works, simple Projector working principle, the several types (DLP, LCD, LED, CRT, LCoS), uses, and benefits and also drawbacks of each type.

In order to understand better a projector, one must first realise what projection is. It’s not a new practise to display something on a screen. Even though shadow play is simple, it serves as the foundation for projection technology. As all children enjoy shadow play.

What is a Projector?

Projector Definition: Projectors are optical devices that project images onto a surface, most often a projection screen. Projectors that use lasers to genuinely stretch the image are newer and more advanced than those that use a simple light source to create a picture.

Instead of using an external projection screen, a virtual retinal presentation or retinal projector directly projects a picture into the retina.

A video projector is the most common type of projector in use today. Slide and overhead projectors, for example, have been replaced by video projectors, which are computerized replacements for slide projectors.

Computerized video projectors took their place in the 1990s and early 2000s, while older, simpler projectors can still be seen in use in some places.

Handheld projectors that use lasers or LEDs to show images are the most recent innovations in the field of projectors. If there is a lot of surrounding light, it is difficult to examine their projections.

How Projector Works?

An intense beam of light is focussed through a translucent substance. A picture in black and white or color is created by projecting the medium’s colors, tones, and opacity onto a screen (or wall).

Fig 1 – How Projector Works

Movie film, photographic slides, transparent LCD light gates, and DLP projection are among of the most used formats.

The light can also be generated in the form of individual pixels and projected onto a screen as an alternative. LED arrays with super-bright LEDs reduce the requirement for a powerful beam, but they are not bright enough to project very far.

The human eye can’t keep up with the rate at which visuals are being shown in a movie. Depending on the brightness of the environment and other conditions, the eyes typically move at a frame rate of 24-50 fps.

Movies shown in dimly lit cinemas display visuals at a frame rate of roughly 24 frames per second, which the audience perceives as a continuous moving image. Because it moves so quickly, we can’t determine if the light is flickering or not.

Different Types of Projectors

In terms of the technology used to generate a picture on the projector screen, there are a variety of Digital Projectors.

Fig 2 – Different Types of Projectors

The following is a list of the several digital projectors types:

DLP Projector

Digital light processing projectors, often known as DLP projectors, make use of small mirrors to reflect light onto a display. Sequential colors are generated by spinning a physical color wheel included in the configuration.

Depending on the model, DLP projectors can have a single DLP chip or three DLP chips, each with a different color of DLP.

Ambient lighting situations, such as classrooms and conference halls, are ideal for DLP projectors because of their bright light output.


How does a DLP Projector Work?

In a DLP projector, a chip is built up of millions of minuscule mirrors, each of which is adjustable.

To produce a bright or dark pixel, they might move closer or away from the light source. Rotating the color wheel causes pixels on the screen to appear in a variety of colors.

An observer views a full-color image successively at a far faster rate than this. Frame rates are typically doubled or even quadrupled in most systems.

Advantages of DLP Projectors

  • It produces images with vivid colors and a high level of contrast.
  • The generated pictures are crisper with less gap between the pixels since the spacing between the component micro-mirrors is 1 micron.
  • Maximum light output with little light loss.Compared to other projection systems, deeper blacks.

Disadvantages of DLP Projectors

  • The rainbow effect is rather common.It has a restricted number of pixels.
  • Compared to LCD projectors, they have a lower brightness.
  • Flashes across the screen in short bursts that might be a nuisance.

Uses of DLP Projector

  • In our homes, schools, and workplaces, we make use of DLP projectors for a variety of things.
  • Conferences and presentations were delivered using a corporate projector.
  • For showing movies, TV shows, video games, etc. in a home theatre.
  • Telecommunications and utility industries use them in their command and control centers. Throughout lecture halls, hotels, and other venues for seminars and product launches.

LED Projector

It’s simple to connect LED projectors to smartphones, computers and other devices. LED light projectors ensure that the projected picture or video is crystal clear and has high resolution.

High-quality LED projectors are used to display pictures and other content. The LED bulb life has been enhanced, and they may be controlled remotely.

They may be mounted on a ceiling or carried about in a bag. Noise levels can be lowered by 50% in some of the most advanced versions.

How do LED Projectors Works?

The light source for LED projectors is an LED bulb. To generate light, LEDs use an electroluminescence process. The LEDs’ semiconductor material conducts electricity in the source light.

Certain sorts of energy can travel through. Electricity generates electrons that are too large to pass through the substance when it is applied. These particles shrink and emit protons, which are the building blocks of light.

When compared to standard gas-filled lights, this method produces a fraction of the heat.

As a result, LED lamps to have a longer lifespan than traditional incandescent bulbs.

Red, green, and blue LEDs make up the arrays of LED projectors. They’re placed in a variety of ways to produce a bright white light that’s quite accurate.

These small mirrors reflect this light back to the eye. To put it another way, LED projectors function in much the same way as LCD and DLP projectors, with the exception of the light.

LED projectors provide a number of advantages. It produces less noise and heat when it is running.

In comparison to most conventional lights, LEDs can provide a more consistent white light.

Thus, LED projectors are more able than conventional projectors to create a wide range of colors.

Advantages of LED Projector

The Advantages and Disadvantages of a Projector are as follows:

In order to create pictures, LED projectors require LED bulbs. In comparison to incandescent light bulbs, LEDs are known to be more energy efficient.

Without the need of any color filters, an LED projector may create light in any color.

LED projectors are lightweight and portable.LED projectors are significantly easier to set up than traditional projectors.

Compared to DLP projectors and LCD projectors, they may be switched on and off more often.

Using LED projectors has little effect on one’s well-being. Unlike DLP and LCD projectors, which experience sudden failure, LED projectors to degrade over time.

LEDs have a longer lamp life and a reduced cost of lamp replacements than incandescent bulbs.

Disadvantages of LED Projector

LED projectors have a high initial cost. Ambient temperature affects the LED projector’s brightness.

In order for them to work properly, you need to keep the room at a certain temperature. For LED projectors to work effectively, a current-regulated power source is required.

LEDs can only produce light when the electrical polarity is proper.

Pollution of blue light.

What is the use of an LED Projector?

Similar to LCD and DLP projectors, LED projectors to have their uses. Some of the most prevalent areas of use are listed here.

  1. Classrooms
  2. Rooms at a university dormitory
  3. Home theatres
  4. Rooms for Conferences

LCD Projector

Another prevalent projector technology is LCD, which stands for Liquid Crystal Display. LCD projectors make use of the same liquid crystal display technology as LCD TVs and monitors.

The pictures displayed on an LCD Projector are generated in a multi-step process. Red, green, and blue are the primary colors used to display images on three LCD displays. The image is entirely colored since all three colors are presented at the same time.

The LCD Projector Full Form is Liquid Crystal Display Projector.

Working on LCD Projector

In LCD Projector Working Principle, a picture is formed through a series of processes using three liquid crystal screens. Three mirrors, each configured to reflect a certain wavelength of light, receive a beam of white light from a light source.

An LCD screen gets an electrical signal for each of the colored light beams it receives. An electrical signal instructs the display panel on how to arrange its pixels in order to produce a picture. Because of the angle at which the light from the source falls on the screens, an identical picture appears on each LCD display in a distinct color.

A prism is used to blend several colored pictures into a single image. The next step is to pass the picture via a lens so that it may reflect on a projection screen and be seen.

Advantages of LCD Projector

  1. In comparison to DLP projectors, LCD projectors use less power and provide a higher quality image.
  2. Compared to other projection technologies, LCDs offer images that are more vibrant.
  3. Create brilliant and gorgeous colors even in a well-lit space.
  4. Using an LCD projector results in visuals that are more focused and clear.

Disadvantages of LCD Projector

As a result, photos appear overstuffed with pixels, like they’re made of chicken wire.

  1. It is cumbersome to move an LCD Projector around.
  2. Becomes riddled with dead pixels as time goes on.
  3. LCD projectors are costly to replace.
  4. They are also susceptible to exhaustion.

These are the LCD Projector Advantages and Disadvantages.

LCD Projector uses

Use of LCD Projectors in the following fields is extremely common:

  • Schools
  • Presentations with the purpose of promoting a company
  • There are a lot of trade shows and exhibitions out there.
  • Theaters in one’s own home

CRT Projector

CRT projectors were widely utilized in the early days of the industry. Small high-brightness cathode ray tubes are used in this device (Hence the projectors are called CRT, Cathode Ray Tube projectors).

In the early 1950s, the first colour CRT projector was developed. These projectors employ three separate CRTs to create an overall image by focusing on each individual CRT’s red, green and blue sections of the video input.

As a result of the lower cost and greater ease of use offered by newer technologies such as LCD Projectors, DLP Projectors, and LED Projectors, they have mostly been phased out.

Working of CRT Projector

A cathode ray tube (CRT) is the image-generating element in a CRT projector, which is a video projector that employs a tiny yet brilliant CRT. Lenses in front of the CRT display are used to focus and magnify the picture. This is when color CRT projection systems first came on the market.

Advantages of CRT Projector

  1. Longevity of service.
  2. The light is bright enough.
  3. Replacement bulbs for rare bulbs
  4. Exceptional clarity
  5. Improved all-around blackness
  6. There will be no input latency and no motion blur.

CRT Projector’s Disadvantages

In comparison to other modern projectors, they are bulky and cumbersome.

They take a long time to put together. The current DLP and LCD technologies have a higher maximum ANSI brightness, but the absolute ANSI brightness is much lower.

Color and geometric distortions differ. Increase the amount of electricity used.

Burn-in is more likely to occur.

Uses of CRT Projectors

  1. Larger photos can be taken.
  2. The process of resizing a photograph is rather simple.
  3. The cost-per-inch is far cheaper than on a TV.
  4. Almost as good as being at a theatre.

LCoS Projector

In LCD technology, LCoS stands for Liquid Crystal on Silicon. LCoS Projectors, like LCD projectors, divide the light into three colors: red, green, and blue, and send each of those colors to its own LCD-based imager.

Although the light passes through the LCD cells, it first bounces off a reflective surface behind the cells.

LCoS projectors utilize white lights as their light source. Blue lasers and yellow phosphor are used in some LCoS projectors.

How do LCoS Projectors Work?

Three LCOS chips are used in LCoS projectors to regulate light in three different colors: red, green, and blue. It does not, however, feature a rotating color wheel like a DLP Projector. Cost and resolution are generally high with LCoS technology.

Advantages of LCoS Projectors

  1. High-definition video
  2. Compared to DLP Projectors, pixel edges are more uniform.
  3. Images that are more true to life and nature.
  4. Using an LCoS projector, you can see red, green, and blue colors all at once.
  5. When contrasted to a DLP projector, there are no rainbow effects, eye strain, or headaches.

Disadvantages of LCoS Projector

  1. Contrast is poor.
  2. Ambient illumination has a detrimental effect on it.
  3. Only 1000-1500 hours of light life are available.
  4. Replacements cost a lot of money.

5 Uses of LCoS Projector

  1. Viewing systems that are close to the eye.
  2. Infrared beam guiding
  3. Projectors that are smaller than a microchip
  4. Projectors with holograms
  5. School Presentations

Advantages of Projector

  1. The ability to alter the size of the screen
  2. Optimal comfort for the eyes
  3. Movability

Disadvantages of Projector

  1. A Dimly lit Room
  2. Proper Maintenance
  3. Dynamic Speakers
  4. Ceiling-Mounted Projector

Applications of a Projector

When a projector is needed, it may be used in six distinct ways.

A Home Theater Projector

When you want to view movies or HDTV at home, this projector has a number of convenient connectors.

A home projector may be able to provide users with a more flexible and broader viewing experience than traditional television.

In-office presentation projector

Because of its superior system configuration (which includes chips and memory and a wireless connection), this sort of projector is far superior to a tablet computer in terms of features, such as 3D and other functions.

Projector for Educational Conferences

Schools and corporations alike make extensive use of conference projectors for presentations and lectures. Mounted projectors are the norm. With a brightness range of 2000-3000 ANSI lumens and a standard resolution, this monitor is small and portable.

When it comes to cooling and dust resistance, these projectors are top-notch. The user interfaces also provide a lot of options.

A Projector for displaying technical data

Because engineering projectors have a greater magnification ratio than typical home theatre projectors, they are able to produce a larger image. They are more powerful and have a greater range. Also offered is a multi-bulb mode, which allows for greater flexibility and adaptability in a variety of installation circumstances.

Educational institutions, the news media, and government agencies can all benefit from their utilization.

The Theater’s projector

More stable, with a low failure rate, and great heat dissipation capabilities are some of the advantages of these projectors. A need.

The projector’s most critical feature is its brightness. Between 5000 and 10,000 lumens is the typical brightness.

Measurement of a Projector

This sort of projector is most commonly used for product testing. You may think of them as testing equipment, and that’s exactly what they are.

General FAQs

Difference Between OHP and LCD Projector?

When it comes to projectors, LCDs (liquid crystal displays) are as distinct from overhead and opaque models as a spacecraft is distinct from an automobile. LCD projectors often cost more than overhead projectors due to LCD projectors’ higher level of sophistication.

Uses of Slide Projector?

In order to examine photographic slides, a slide projector employs optical and mechanical mechanisms. It’s got a little lightbulb in it.

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