How do lcd projectors work

From there the LCD panels send the light through the dichroic prism which recombines the light and sends it out the main lens in the LCD projector to the surface against which it is projected. Each LCD is only capable of controlling one color. So if you were to see a picture of a red plane against a blue sky, the green LCD would block the light from passing to the dichroic prism and out the lens.

LCD panels in LCD projectors work by allowing the polarized light to travel through a pane of glass into the liquid crystal inside the display. The liquid crystals bend the light, and it is traveling on a different plane then when it entered through the polarizing filter. If you apply an electrical current to the liquid crystal they will align, allowing the light to pass through on the same plane as when it entered. If you add a second polarizing filter at the other end of the liquid crystal you can then effectively block all light from passing through.

Each LCD panel has a separate system to control the electrical current that passes through the liquid crystal, allowing each to be controlled individually.

The resolution, or how sharp the image is, of each LCD is determined by the number of cells which are called pixels, with the higher the number of pixels meaning more clarity to the image. Each LCD panel also has the ability to control what color each pixel will be in that particular panel so that when all the light is recombined at the dichroic prism, it will be the right color.

Think of it working the same way that the old dot matrix printers used to work. They would combine dots of the three main colors to provide the desired color. This is the same way that LCD panels work. Irrespective of whether the projector uses LCD or DLP, the only difference between a lamp and a laser projector is the source of light. Lamp projector uses an Incandescent lamp to produce the light whereas a laser projector produces light using lasers.

Now you may be thinking laser projectors must be dangerous. As even the weakest laser pointers in the market come with caution to not point the laser at eyes or directly look at them. In reality, a laser projector is as safe as a lamp projector. The laser projector passes the laser light through a fluorescent diffuser to create soft light which is totally safe.

Lasers have a lot of advantage over lamp projectors. Lasers are energy efficient and can create a brighter light. Further, there is no heating time required which means you can get the best possible performance the moment you press the start button. A normal lamp projector creates a white light which is later separated into Red, Green and Blue light. All the other wavelengths of non-RGB light are simply wasted, making the system inefficient. With lasers, you have the ability to create the exact color you need.

It is important to note that some of the laser projectors actually uses LED lights in place of lasers. Projectors with lasers are expensive and that is why you cannot find them in budget projectors. Also once the lamp of the lamp projectors stops working, you can simply replace them. But most of the laser projectors come with a fixed laser which cannot be replaced.

Related: Best projector for murals. Slide projector These were mainly used in office, exhibition, laboratories and classes to display photographs and slideshows. Next coming to the digital projector Types of digital projector The digital projectors come in two types. Did you know? He has a master's degree in electronics and a deep understanding of underlying technologies used inside tech products. He likes to travel and fly his drone around. He can often be found on the trails of California.

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View the latest supply chain information. First introduced in the s, LCD projectors are among the most popular on the market. How do LCD projectors work?