How an LCD Projector Works
There are mainly DLP and LCD projectors on the market today. Models differ in their functionality. This is how an LCD (LCD) projector works.
AT LCD– projector image is created due to 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.
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