Tech

How does a projector work? Simple explanation

The projector allows you to project large images with high resolution. But how does it work? We explain on the fingers.

How an LCD Projector Works


There are mainly DLP and manual projector screen on the market today. Models differ in their functionality. This is how an LCD (LCD) projector works. In an LCD projector, the image is created by the interaction of colored rays.

LCD stands for “Liquid Crystal Display”.

The image is obtained from multi-colored rays of light: the lamp sends light rays of red, blue and green colors to the mirror system. Mirrors transmit light at some points. As a result, three colored beams rush in the same direction.

Each of the three light beams passes through small LCD panels that act as an overhead projector. Their liquid crystals transmit light only in those places where the appropriate color is needed.

The rays of light that have passed through the filter again enter the mirrors, which combine all three colors into one image, which is projected onto the wall through the lens.


How DLP projector works

DLP projectors work with a rotating color filter that colors the beam in the desired shade.

DLP stands for “Digital Light Processing”. In DLP projectors, colorless light is colored using a filter.

Light is projected from a lamp onto a rotating “color wheel”. This color wheel is like a round cake, the individual pieces of which are colored in their own color (blue, red, green).

The colored beam of light hits the DMD chip. This chip is equipped with many small, movable mirrors. Each time the color changes, the mirrors are aligned with the help of a rotating color wheel so that the colored light is directed to the desired point.

Thanks to the rapid change of colors, the brain combines them into one image, although in fact they are projected sequentially.



Pros and cons of DLP and LCD projectors



LCD technology, thanks to the control of the light transmission of LCD displays, allows you to very clearly reproduce the difference between light and dark shades. This creates an image with subtle color gradations. The disadvantage of LCD projectors is that they cannot work without light. This is where DLP models have an undoubted advantage, as the mirror technology helps to create a more contrasting image.

The disadvantage of DLP technology is the so-called “rainbow effect”: since the colors are not projected simultaneously, but sequentially, when transmitting motion (video), the viewer’s eye can catch the transitions of the three primary colors.

Thus, an LCD projector is better suited for viewing moving images than a DLP device. And for the presentation of images with rich contrasting color transitions or slide shows, it would be better to use DLP models.

Acer announced the start of sales of the new XD1320Wi projector for less than 70 thousand rubles

The company offered the Russian user a new XD1320Wi projector. The device is already on sale. The manufacturer guarantees that a screen with a diagonal of 300 inches will form an image of at least 1280 × 800, which corresponds to the resolution of Wide XGA

The device uses an LED lamp as a light source. Representatives of the manufacturer declare a guaranteed service life of the light source:. 30 thousand hours when operating in economy mode and 20 thousand in standard mode. At the same time, the maximum light brightness reaches 1600 ANSI Lumen (ANSI Lm, ANSI-lm), and the contrast ratio is 1,000,000:1. The presence of such characteristics of the projector allows its use in any light conditions.

Acer claims that the XD1320Wi projector offers 85% coverage of the NTSC color space. This is a very high figure, indicating the realism of the image generated by the device.

The novelty has a high functionality and is equipped with a number of useful features, such as Vertical Keystone Correction and Auto Keystone Correction. With their help, all types of keystone distortion are minimized. Which expands the possibilities of the projector in choosing the installation location. The model will form a high-quality image both being on the floor and under the ceiling.

It should be noted that the device is equipped with the DLP 3D Ready function, thanks to which a 3D image is formed from all known signal sources. DLP 3D glasses must be used to view content.

The projector has a built-in speaker system.

The Auto Ceiling-Mount Correction function automatically ensures the correct image orientation, which is important when installing the projector upside down on the ceiling.

You can buy the Acer XD1320Wi model at an estimated price of 66,990 rubles.

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