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What is a projector? What is the principle of the projector?

March 25, 2022

Nowadays, the projector in the office space can be said to be everywhere. It has become a part of our daily life, but the working principle of the projector is rarely known. So what is a projector? What is the principle of the projector ?

WiFi mini home projector

What is a projector?


A projector, also known as a projector, is a device that can project images or video onto a screen. It can be connected to a computer, VCD, DVD, BD, game console, DV, etc. through different interfaces to play corresponding video signals. Projectors are widely used in homes, offices, schools and entertainment venues. Depending on the way they work, there are different types of CRT, LCD, DLP and so on.


Looking at the projector market. No matter from the quantity, quality or variety of products, it has reached a certain degree of maturity. The popularization of the products makes the projector's psychological positioning change from more professional display equipment to mass products, and the sales scale of the industry continues to expand.

portable projector

What is the principle of the projector?


When it comes to the principle of projector imaging, the basics are similar. No matter which type of projector, the light is first divided into red, green and blue colors, and then images of various colors are produced. Since the component itself can only be displayed in a single color, firstly, three color components are generated, and then the three color images are combined into one image by a prism, and then projected onto the screen through the lens.


The lens in the projector is equivalent to a convex lens. When the object is located between the double focal length and the focal length of the convex lens (2f>u>f), the light from the object on the projection sheet is inverted and enlarged by the convex lens. Real image. Finally, the plane mirror changes the direction of light propagation so that it is imaged on the screen.

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