How LCD Projector works?

How LCD Projector works?

Oh! So, will your friends be staying at your place at night for home theater blockbuster thrills? And for that, you are looking for the appropriate mechanism the LCD projector uses for the smoother operation. Right? LCD projectors are most famous for their property of light show weather class presentation, or business modulation is concerned. Do you know the first LCD projector invented in the year 1984 by Gene Dolgoff?

Are wonder which technology and how LCD projector work? If yes, keep reading this artifact to know more about the technology three decades old. This technology and mechanism behind the operation of the LCD projector are old enough but one of the leading digital projection technology. This technology is the ultimate rival of Digital light processing projectors and is known by many in this field. Epson and Sony adopted the LCD projectors and their supported technology in the early months of the 21rst century.

The old method of film projection:

Each frame in the film was a small, translucent snapshot in the traditional way of film projection. If you shine light through the film and then release it through an imaging lens, a larger version of this small image will appear on a wall or screen.

LCD projectors: how they work?

The mechanism of the LCD projectors works a bit differently. Rather than passing through a frame of transparent film, a beam of light possessing high intensity goes across almost thousands of pixels that move on the screen of LCD. These projectors have three LCD screens instead of just one, due to which they are known as 3LCD projectors. The emitted light is separated into three shades before going across three LCD panels and finally combining into a prism to create a colorful, vivid image exhibited on the screen.

All the words mentioned above seem like a magic spell. Right? Let’s talk about the procedure in detail, starting from a lamp to a big screen. Grab a packet of chips alongside your favorite fizzy drink to break some light. Following is the step-wise procedure explained on how LCD projector work.

Step #1: emission of light

The process starts by emitting a beam of intense white light by a more substantial light source.

Step #2: hitting of light and reflecting.

A collection of mirrors, consisting of two dichroic mirrors coated with a unique material that only reflects a specific wavelength of light, bounces our white light beam. A prism refracts a light beam into different wavelengths using the exact mechanism.

Each dichroic mirror breaks down only one wavelength. The white light hits the mirrors, reflecting a red, green, and blue colored light beam via the projector.

Step #3: a beam of light passes through a liquid crystal display.

Blue, red, and green light rays all go across an LCD panel made up of hundreds of tiny pixels. It all adds up to small pixels that are colorless and are triggered by an electric charge and either permit or slab light to go across.

The projector’s three LCD panels show a similar picture or merely grayscale operating images. When colored light goes across three of the screens, three copies of the similar sight are produced: tinted blue, colored green, and tinted red.

Step #4: recombination in a dichroic prism

However, the last image we view is full color, not red, green, or blue. The LCD projector allows the merging of three-toned copies of the scenario observed into a dichroic prism. It is a highly developed amalgamation of four triangular shapes to create an isolated image with millions of colors rather than only three of them.

Step #5: the light pass-through lens of the projector

The light goes across the projector lens and then reflected onto the desired big screen. The light source is the version of those mentioned above colorful and vibrant scenarios.

About LCD projectors:

Do you know LCD projectors operate on a principle named transmissive technology? It is a device used to display videos, images, and data you require based on liquid crystals display. These devices are very well known because they are much cheaper than many other alternatives in this field. It can display excellent colors, so it is widely used for office and classroom presentations, business meetings alongside workshops and seminars.

The light coming in and out of an LCD projector is just a simple and standard lamp. It is observed that a higher lumen output is conveyed while using an LCD projector without spending a fortune. The cost of this projector is much lower price than digital light processing projectors. The LCD projector offers sharper images and clearer picture quality but is not reliable enough.

The reason most people prefer this device because it releases lesser heat with no rainbow effect. Also, this project will help you to work in a much quieter environment so that you can give your presentations in a noise-proof climate without any destruction. The only disadvantage we observed was that it shows black and gray color significantly lighter, shown sharper in digital light processing projectors.


Now you are aware of the old and famous technology of LCD Projector and the mechanism old how LCD projector work. We’ve mentioned above all the steps involved in the working and operation of the liquid crystal display projector. Hopefully, if you are interested in science and technology, this article might help you gain new knowledge. Whenever usage of technology is concerned, understanding the principle of working is the primary factor.


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I am a Professional Writer who loves to write on Technology. I do brief research on each topic before starting.

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