Projectors
Video from matrices depending on the type of panel can be divided into three categories. First, it prosvetnye LCD panel. They appeared first. This may be one or trehmatrichnye. The second group comprises reflecting LCD projectors (LCOS), which split into three subspecies because of minor differences in technology. This projectors developed by JVC D-ILA, as well as projectors with GLV and SXRD, developed by the corporation Sony. And finally, the third big category, it is - DLP-projectors, which use established firm Texas Instruments mikrozerkalnye DMD-chips.
Over the past years have been significantly enhanced technology leaving all types of projectors, including megapixel matrix, optical systems and digital image processing algorithms. Now you can get a bigger image at high resolution, with significantly expanded set of advanced features. Moreover, projectors are diverse, depending on the scope. Now, except for business use, projectors appear as home theater components, for education and medical purposes, for aided design systems and simulators, in large offices, companies and public places.
Presentation projectors - is the most traditional use for business purposes. Most of them has a resolution of XGA or SXGA, and the most important features for them - this is a great opportunity for brightness, good readability of the text and compactness: a presentation projector must be a truly portable.
For projectors for home cinema, which are intended to reproduce television broadcasts and video from DVD, already important are other options. For them, most significantly - to reproduce the subsequent image, with many gradations of brightness, clear and vivid color and higher contrast. In this application requirement is a high brightness is not so important.
This means that they can display moving images with high brightness and high resolution, a large number of gradations of brightness, high contrast and accurate colour. Moreover, these projections have the opportunity to adjust the parameters and provides a unique video for digital cinema content protection functions.
Some specific application projectors (for example, in computer systems design or medicine) require large permission. Typically, in these cases the cause is limited to a resolution UXGA. For high resolution on large screens used collaborative work of several projectors, a multi regime. In this case, each video projection provides only part of the image. Such a task often arises in the projection of large corporate or public places.
Projectors with an ultrahigh-resolution images for projection on screens of 3-5 meters and provide more consistent with the requirements of HDTV.
Against the backdrop of the current proliferation of mass presentation projectors model with a resolution that meet the requirements of full HDTV (1920 h1080 with the total number of approximately 2000000 pixels) and large, represent the most rapidly growing class of HD-projectors.
High-resolution image has three distinct advantages. First, the screen displays more detailed information: it allows a permit. Secondly, the viewer can watch high-quality image at close range. Do HD-image number of lines increased, and therefore lower and less visible pixel structure. And finally, compared with less resolution projectors is far wider angle of observation.
The last two (close range and greater angle) significantly increase the sense of realism when viewing images, until the illusion of presence, for example, the nature (of course, with a corresponding plot). Among the developers of technology HD-projectors should be noted Japanese NHK, scientific and technical specialists research laboratory which has moved in that direction with 4000 - line video system.
Studies show that the greatest contribution to enhancing the realism gives an increase in viewing angle of up to 100 °, that is three times more than for HDTV-projectors, for which he is 30 ° (Fig. 1). For the system since 2000 - line interlaced viewing angle of 60 °. Note that in e-cinema-letter abbreviation adopted for different systems, determining which is rounded up to thousands of lines. Thus, the system with the number of lines of 4000 is designated as 4K (K - is the first letter multiplier 1000, a kilo). Similarly, a system with other rows described as 2K or 1K. The latter, for example, refers to the 1020 HDTV - line interlaced.
