The most common question that is asked when buying a new projector for the home, office, or classroom is: do I buy an LCD projector or a DLP projector? LCD, short for ‘liquid crystal device’ and DLP, an acronym for ‘digital light processing’ are the two commonplace projector imaging technologies. With so many business brands and different models available, it can be challenging for consumers to pick between both technologies. The fact is that LCD projectors offer far superior image quality and colour accuracy. The next paragraph will tell you why DLP projectors struggle with reproducing a comparable standard of image quality.
Visualise a set of blinds in your room for your bedroom window. By a twist of a rod you can turn the shutters open or closed, according to if you want to let light in or not. That is exactly how an LCD projector operates. Each pixel works like its own shutter on a set of blinds to either shine light through or to block it. DLP on the other hand is formed of millions of microscopic mirrors or ‘pixel elements’ as the pros like to call them. Each pixel element operates to either reflect light or block it.
How the light source is processed from the time the projector is turned on to when the content reaches your screen is vitally significant with regard to image quality, brightness and colour accuracy. LCD projectors process white light from the lamp by dividing it into red, blue and green components, by three mirrors which transfer the coloured light to 3 different LCD panels. The 3 LCD panels form the elements of the image by shining each pixel on and off. The pixels are then combined in a glass prism to form the projector image. A significant point to know about LCD projectors is that all three colours are delivered onto your screen at the same time. The way a DLP projector operates is vastly different and even how an image shows up is not the same. With DLP, white light from the lamp is sent through a spinning colour wheel with transparent red, blue and green segments, at speeds up to 11,000 rpm/s. This approach to making an image requires a sequence of red, blue and green light. The millions of micro mirrors as mentioned above reflect the coloured light on the pixels to construct the image elements. The elements of the image are sent in sequence on the screen, one colour at a time. The viewer’s vision will then combine each coloured element of the image into the complete image. From LCD projectors, all colours are available all the time to create the best brightness and superb colour accuracy. In DLP, only one colour is available at once, resulting in lower colour brightness and accuracy. Some developers have added a white segment into the colour wheel to improve general brightness, but this goes and lessens colour accuracy.
I find in forums all the time that DLP offers a higher contrast ratio and as such must be superior. For those who are unaware, the contrast ratio is a measure of a display system defined as the ratio of the luminance of the brightest white to that of the darkest black that the projector is capable of producing. DLP projectors do provide high contrast specifications in comparison to the majority of LCD projectors. At a glance, this appears to be an advantage, however, in the real world, the true black level is determined by the ambient light in the room where the projector is in use. Do not be tricked by contrast specifications on websites and in brochures.
When the content you wish to project needs moving images, DLP projection technology can also create image errors, or ‘artifacts’. The most commonplace artifact that a DLP projector forms with moving images is colour break up. Colour break up is inherent in DLP systems because moving images change up between the time red, blue and green colours are pulled up. LCD projectors do not have this problem because the colours are delivered at the same time. DLP builders have come up with 3DLP solutions using 3 chips to resolve the colour break up issue, but the expense of these projectors make them hardly practical for the large part of businesses and consumers.
Another difference between LCD and DLP is how they match the balance for the refractive qualities of light. Jump back to high school science, and recall how various colours of light refract varied amounts when directed through the same lens. The downside with DLP projectors is that they take the one same panel for the same lens to project Red, Blue and Green. All 3 colours are not the same and refract light differently. Often with a DLP projector, a spill of yellow colour will come up above and a superfluous blue will appear below something as simple as a single black line. While being built LCD projectors can be adjusted to take away these effects on the projected image, because each colour is directed on its own LCD panels.
The one real plus (excluding price) with taking a DLP projector is its smaller size and weight. However, this is only relevant in regard to mobility and has to be traded off against the image plusses of LCD projectors. If the result of the picture quality is important to you, then the solution is simple. Go with an LCD projector! LCD projectors will always produce bright, colourful images with fewer image errors. If you want to ask more about LCD technology in more detail, have a look at this tremendous resource website: Explore 3LCD. If you have any other questions, go to Projector Central and send me an email.
Jonathan King is the sales and marketing manager of Projector Central, Australia’s top online provider for projectors. Based in Brisbane, Projector Central has serviced Australia for 15 years. For data projectors in the Gold Coast and Interactive Whiteboards, contact Projector Central today.
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