Understanding LCD Projectors and Types

Understanding Projectors and Types, Functions, How they Work, Advantages and Disadvantages

An LCD projector is a type of projector that is used to display video, images, or data from a computer on a screen or something with a flat surface such as a wall, etc.

Understanding LCD Projectors and Types
Understanding LCD Projectors and Types

Understanding the Projector in General

Understanding Projector according to experts is a device that can integrate light sources, optical systems, electronics and displays with the aim of projecting an image or video onto a screen/wall and making it look bigger.

In other words, the definition of a projector is a tool to help display images, videos or other data from a computer or laptop to a screen (it can also be on a flat surface such as a wall).

Projectors are very useful for helping someone with presentations and presenting explanations or presentations in the form of text, images, animations, or even videos, to the audience to make them easier to understand.

Projector Function

Referring to the definition of a projector, the function of a projector is to display objects or data (text, images, videos) on a computer/laptop on a screen or wall. The projector can display objects in a larger size easily and has high flexibility.

Here are some projector functions based on their use:

  1. Presentation Tools
    The use of a projector in presenting a presentation will make the explanation easier and more attractive. The display of text, images, or animation in a presentation makes the audience better understand the intent and content of the presentation.
  2. Information Media
    Projectors can display an object or data on a computer device to make it look bigger. This makes it a very effective and efficient information medium.
  3. Entertainment Media (Home Theater)
    Having a projector at home can provide its own advantages because it can be used as an entertainment medium. For example, watching videos in a much larger size like in the cinema.

How the Projector Works

As in the definition of a projector where its function is to display an image from a computer to the screen, then briefly how a projector works is based on the principle of light refraction. Where the light can be generated from 3 LCD panels which are separated based on 3 basic colors such as Red, Green and Blue.

As already mentioned, projectors work on the principle of light refraction. LCD panels LCD (Liquid Cyrstal Display) or Liquid Crystal Display contained in the projector will produce light.

The panels on the projector are composed of three separate panels based on three basic colors, namely Red, Green, Blue (RGB). The refraction of the three panels will emit light from the projector.

All light passes through the panel and blends through the prism inside the projector set. Then the combination of light is emitted onto a projection screen or flat reflected media, so that objects on the computer/laptop device can be projected on the screen properly.

Projector Types

There are several types of projectors that are distinguished based on their function, including:

  1. Digital Projector
    This projector can convert data in the form of images directly from the PC to the screen with a lens system. Usually used for the establishment of a home theater system.
    The technology used by this projector is High Intensity CRT, LCD projector, DLP Technology.
  2. LCD Projector
    A more modern type of projector that was developed from its predecessor, namely the Overhead Projector (OHP) where OHP still uses writing on clear paper.
  3. CRT Projector
    Used in conventional TV machines in the last few decades by utilizing a picture tube-shaped projector.
  4. DLP Projector
    The image is produced from microscopic small glass arranged in a matrix on top of a semiconductor chip or commonly known as a Digital Micromiror Device.
  5. LCOS Projector
    This type is an update of LCD and DLP which is produced lighter and the resulting resolution is better.

Projector Advantages and Disadvantages

The use of projectors in general provides its own advantages for its users. However, projectors also have drawbacks, which are explained below:

A. Pros of Projector

When viewed from the previous understanding of the projector, the use of a projector in a presentation has several advantages, namely:

  1. Easy to operate
    Although LCD projectors are relatively new, they are very easy to use and the system is not complicated to use. LCD has a simple way of working, that is, it can directly display the computer screen to the background, so it’s no wonder that this tool is always used for presentations.
  2. The material can be conveyed clearly
    By using an LCD projector, the material presented can be easily conveyed to the audience. Especially if the presentation material requires illustrations, pictures or videos, then using a projector can make your presentation easier.
  3. Facilitate the interaction process
    The projector supports the presentation process starting from the presentation of the results to a question and answer session or discussion. This is advantageous when making presentations where the goal is to have a two-way discussion.
  4. Get audience’s attention
    Inevitably, the audience will pay attention to what you display through the LCD screen. Moreover, the more interesting the material you convey, the more interest the audience will be to listen to what you have to say.

B. Lack of Projector

In addition to having advantages, the use of projectors also has disadvantages. Here are some of the disadvantages of projectors:

  • Projectors are usually expensive
  • Some types of projectors have complex settings
  • Using a projector increases electricity costs
  • The projector produces a fairly high radiation
  • Projector repair costs are usually expensive because spare parts are still rare

Projector History

Gene Dolgrof is the scientist who invented the first LCD projector. The discovery began when Gene would produce a video when he was still working at a university in New York.

At that time, Gene had the idea of ​​making an LCD projector that was brighter than a 3-CRT projector. It uses a special element called a light valve to regulate the amount of light that passes through the projector.

Gene tries to use various materials to realize his idea. In 1971, he tried to use liquid crystal as a projector light regulator.

In 1984, Gene made significant progress on his experiments. In the same year, Gene succeeded in making the world’s first LCD projector.

So that’s a brief overview of the meaning of projectors, projector functions, types and workings of projectors, as well as a brief history of projectors. May be useful.

Source: https://www.maxmanroe.com/