Review poroektov

Instead of regular review of projectors offer you a purely practical material, which would allow a little deeper understanding of these technologies. We invited a lot of models and a large number of different technologies. But we - first of all buyers, and market projectors are now under regular transformation. Your humble servant chose the main issues that came to me on the subject in recent times. Many after reading the material might think that projection technology dies. It is, it is that either the demand is part of our "digital home" tomorrow. It is true that the cheaper DLP-projectors are harmful to health? What is a "rainbow effect", and from which it emerges? How much is normal DLP-projector? Why expensive LCD and DLP-model faces the same? At today's market are most popular decisions projectors, an image which is formed of Technology DLP (Digital Light Processing) and LCD (Liquid Crystal Display). In terms of luxury models, the formation of images in both cases is virtually identical - each point is the result of combining the three - red, green and blue - split light beam passes through a matrix or reflected from mikrozerkalnyh chips, then reduced. In the version of LCD is usually used three active matrix TFT-on polycrystalline, through which pass, and then combined luminous flux. As part of the DLP situation is similar - using three DMD-chip (DMD - Digital Micromirror Device), the flow of light reflected or not recognized by mikrozerkal, after which all three images combined. At this point is understood that the three-DMD-chip is used only in very expensive (!) Models, and the technology corresponds to 3 class quality. The models 1 and 2 classes, which are now being distributed as a DLP-budget device used is another shematika - used a DMD-chip and a color filter, which is often called "color wheel", divided into red, blue and green sectors. With its rotating at high speed and with it the work of the chip raises a colorful picture. In this case, particularly our visual perception, its integral properties. When a high-speed rotation "color wheel" people will not notice the change of colors on the screen, or if the talk in simple terms, they would "merge". And actually, if you sfotografiruete image from the DLP-projector conventional camera, you get red, blue or green image. That is why this is not a vision but a vision, as in shaping the image of DLP-projector 1 or 2 classes involved and the brain. The first devices to DLP-DMD-one chip, which is now the cheapest, the speed of "color wheel" is equivalent to 60 revolutions per second, because of the frequency in the U.S. electricity grid. Then there were some reasons for this increase in speed ... The second overseas has been marked 120 revolutions per second, which is double the speed "wheel". Accordingly, an upgrade and DMD-chip, which DLP-projectors next generation went up slightly. And for the first time around DLP-devices oboznachilas or did priotkrylas very wonderful problem, which had been widely written in the specialized press a few years ago. Name the problem - "rainbow effect" that is recognized, but full-scale tests, most likely not carried out. Each uniform dot on the screen is the result of successive outbreaks of color. If while watching a fast wave your hands in front of the eyes, then you will notice the absence of any color, because your fingers while passing before my eyes, obscure from us one of the non-ferrous sector. And, often, the term "rainbow effect" can be found another description, namely the delay or improper imposition of flowers on moving objects in the cut. This is not really true, since even in one-DLP-projectors (60 revolutions per second) for each frame wheel prokruchivaetsya exactly two times, that is One frame is displayed in full as a static image. A motion of objects we perceive only through the frame. The problem of "rainbow effect" in another - in consecutive colored flares, which can be visible to the naked human eye and irritate optic nerve. People who work with odnochipovymi DLP-projectors, to exercise increased eye fatigue, headaches occur. That is, suffered precisely those authorities who are responsible for visual perception. The solution to this problem for developers of technology, it was obvious - increasing the speed of change of color. Question upersya in the mechanics - to increase the speed of rotation of "color wheels" were needed sverhdorogie elements (bearings, etc.). That is, achieving even tripling the value of speed, namely 180 revolutions per second, required major technological costs. The issue decided in another way, increasing the speed of just four times - "color wheel" was not divided into three as before, and a six-colored segments. DMD-chip has been successfully updated, but it has affected prices. And now, DLP-projectors can be divided into the budget (from Three "wheel"), expensive (from shestitsvetnym "wheel" in the range of $ 5000 - $ 10000) and very expensive (without wheels, but with three DMD-chip operating on the principle of LCD -projectors). Is there an advantage to the DLP compared to LCD? Yes. The fact is that the light beam in the LCD-projectors works for transmission, which is passing through a matrix of the DLP, it does not affect or impact of mikrozerkal. The second technique is much better in terms of contrast. This time, incidentally, very well played into the hands of DLP-technology in nizkobyudzhetnom range, which feature the contrast greater than competing LCD-model several times, with nearly the same brightness values. A segment of very expensive equipment manufacturers of DLP-projectors are trying to use the three-DMD-chip without any "color wheel". For example, in Russian stores can be found DreamVision X3 projector at a cost of $ 45,000, which is positioned as one of the most high-quality models of modernity. It establishes three-chip HD2, each responsible for a certain color. Among the professional models on a large audience is also to provide NEC XT9000 ($ 85,000), which is also used trehchipovy DMD-standard. In general, the "rainbow effect" is not scientifically proven (at least I have not seen this), but it is written producers expensive DLP-projectors selling model with shestitsvetnym wheel. So, the problem is. More expensive models of LCD and DLP with three chips, they often vary in value. As part of the LCD-higher price range of devices used very large in size and expensive TFT-matrix. In addition to block imaging at a price significantly affect other equally important elements - replacement lenses complex and high-quality, programmable digital control, Wi-Fi, mnogolampovye cascades. In the design of the shell sets special cooling system, noise reduction, filters that protect against infiltration of dust, etc. I've heard of CRT and D-ILA-projectors. What is it? This is the same thing? Cathode-ray tube (CRT for short, in English - CRT, Cathode-Ray Tube) - is the main element of the old-generation TVs. Their main advantage - the use of an analog signal as the source. At this point it makes no sense to go into the details of the device TVs, but is worth noting that the CRT (or CRT) projectors have long been known, their structure implies the existence of three cathode ray tubes, emitting red, green and blue colors on the screen through special lenses. The technology DLP and LCD is the idea of splitting the picture at the point (pixels). And so interesting to look like a model of the standard D-ILA. This formulation is unique and incorporates three technologies at once. For each of the three colors is a source of the image (CRT), which transports it to a liquid crystal. For the crystal is a mirror and beam passing through a matrix of affected or not affected. In principle, this technology incorporates shortcomings LCD, namely, the passage of the beam "on clearance" (in fact before the mirror beam passes through the matrix), but at the same time, it eliminates or nearly eliminates discretization output image. D-ILA in our market can be found in a series of projectors JVC DLA. For example, JVC DLA-SX21 ($ 7800) with miniature matrices of 0.7 inches. Looking specifications, the brightness of this model is a 1500 lumen (ANSI), the contrast of 800:1. These features can be found at the projectors less than $ 1000, but should focus primarily on visual comfort. Technology D-ILA today one of the best, if not to speak of trehchipovyh doroguschih LCD and DLP. In conclusion, Current projections have gone far from our understanding "filmoskopov." This whole high-tech industry. Undoubtedly, the projectors are seen as part of the "digital home" future, but, nevertheless, should understand the essence of what is happening ...