1, CRT projection?

CRT is the abbreviation of cathode ray tube, which means cathode ray tube. As an imaging device, this projector can decompose the input signal source into three colors, R, G and B, and display them on the fluorescent screens of three CRT tubes. The fluorescent powder is amplified and converged by the luminous system under high pressure, and the color image is displayed on the big screen. The optical system and CRT tube form a projection tube.

2. Liquid crystal projection

LCD projectors adopt passive projection mode, which can be divided into two types: LCD light valve and LCD flat panel projector. The key technology of LCD projector is the manufacture of LCD panel. Liquid crystal panel LCD projector uses external light source metal halogen lamp or UHP (cold light source) lamp as light source.

3.DLP projection?

DLP is the abbreviation of "digital light processing", which means digital light processing. In other words, this technology must first digitize the image signal and then project light. It is a digital micromirror device developed by TI (Texas Instruments) Company.

4.LCOS projection?

LCOS (liquid crystal on silicon) is a new digital imaging technology. It uses semiconductor CMOS integrated circuit chip as the substrate of reflective liquid crystal display. The CMOS chip is coated with a thin layer of liquid crystal silicon, and the control circuit is placed behind the display device, which can improve the light transmittance, thus achieving greater light output and higher resolution.

Second, according to the use environment:

1, home projector?

Mainly for video optimization. It is characterized by its brightness of about 1000 lumens, high contrast, and the aspect ratio of the projected picture is mostly 16:9, and various video ports are complete, which is suitable for playing movies and HDTV, and suitable for home users. ?

2. Commercial projectors

Generally, a projector weighing less than 2 kg is defined as a business portable projector, which is comparable to a thin notebook computer. Business portable projector has the advantages of small size, light weight and strong mobility, and is a substitute for traditional slide projectors and large and medium-sized projectors. The combination of thin notebook computer and business portable projector is the first choice for mobile business users to demonstrate mobile business. ?

3. Educational projector?

Generally used in schools and enterprises, the mainstream resolution and brightness are about 2000-3000 lumens, with moderate weight, good heat dissipation and dust resistance, suitable for installation and short-distance movement, rich functional interfaces, easy maintenance, relatively high cost performance, and suitable for public purchase and promotion.

4. Engineering projector?

Compared with mainstream projectors, engineering projectors have larger projection area, longer distance and higher brightness, and generally support multi-bulb mode, which can better cope with large and changeable installation environment, and are very suitable for education, media, government and other fields.

5. Theater projector?

This kind of projector pays more attention to stability and low failure rate, and has strong heat dissipation performance, network function and ease of use. Of course, in order to adapt to various professional applications, the most important feature of engineering projectors is high brightness, which can generally reach more than 5000 lumens and the highest can exceed 10000 lumens.

Because of its huge size and heavy weight, it is usually used for special purposes, such as theaters, museums, great halls and public areas, and can also be used for traffic monitoring, public security command centers, fire fighting and air traffic control centers.

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