Projectors have become an inseparable part of business offices, schools or entertainment etc. One cannot imagine a presentation without a projector. Almost all lecture rooms are equipped with projectors. In this article, we will discuss the various types of projectors (CRT, LCD and DLP) and how it works.
Regarding the types of projectors, they can be divided into 3 main categories as follows：
- Cathode Ray Tube (CRT)
- Liquid Crystal Display (LCD)
- Digital Light Processing (DLP)
1.Cathode Ray Tube (CRT)：
A CRT projector is basically a video projecting device. It uses a tiny cathode ray tube which has high-brightness for image generation. A Lens is kept in front of the CRT face which focuses the image and enlarge it onto a big projection screen.
CRT projectors are not portable as they are huge in size and heavy in weight. Their electricity consumption is also high because of three light guns. At initial stage, it may be difficult and tricky to set up a CRT projector, but the users say that CRT projectors have a brilliant and outstanding picture quality.
2.Liquid Crystal Display (LCD)：
The meaning of Liquid Crystal Display is approximately clear from its name. The word LCD resembles two states of matter, the liquid and the solid. A Liquid Crystal Display uses liquid crystal to project an image or object.
These types of display panel are generally used in computer, Laptops, TVs, portable video games and cell phones. Displays in LCD technology are much thinner as compared to CRT technology. Meanwhile it is lighter and more convenient, and more in line with the needs and preferences of modern customers. Therefore, most of our vamvo projectors are of the LCD type.For example: Projector L6200, L4500, etc.
3.Digital Light Processing (DLP)
Digital Light Processing (DLP) is a video innovation made by Texas Instruments that is utilized for front and back projection units. It is regular for back projection in TVs and also utilized in front projectors for units intended for organizations and classrooms. Digital Light Processing makes utilization of micro mirrors called a Digital Micro mirror Device to reflect light and shading onto a screen. These micro mirrors are situated in a semiconductor chip and are little. Most of the DLP chips are manufactured by Texas Instruments.
I believe that by the time you read this, you will already know the three main types of projectors on the market. And this can provide some reference value for you to choose a projector. So next, let's discuss how a projector works, which will benefit you to operate it more familiarly.
How a Projector Works:
Talking about how it works, there is a lamp inside, which is a source of luminous flux. Passing through the optical system, the flow in accordance with the principles of light projection is divided into three colors (red, blue, green). Next, it enters the modulator (liquid crystal or micro mirror matrix), which creates a pixel structure. The control unit, receiving signals from the image source, adjusts the direction of the modulating matrix. The lens, in accordance with the principle of focusing, collects streams of different colors and forms an image on the screen.