【 Weak current College 】 big-screen mosaic wall of major categories and features

Mosaic display wall is more than one display unit press N * M forms are combined into logical integration of virtualization, the purpose of a screen is displayed as follows:
1, increase the size of the whole picture display
2. reduce the projection distance
3. increase the display brightness
4. increase the display resolution
5, multiple window display of multiple signals simultaneously
These objectives are mutually proportionate, to sum up to two points: extended resolution and screen size and projection distance problem
Although non-projection class shows no projection distance problem, but the current technology level display unit is not possible to do so, the current maximum is 103-inch plasma PDP; projection display class, because the projector brightness cannot be infinitely high brightness in projector output will display the screen brightness with the screen, screen brightness into the rough than decrease, the square, a 8000 lumens of high-brightness projector projection 200 inch screen, the screen brightness is only 2000 lumens high brightness projector projection screen is 100 inches, on the contrary, in screen technology, projector (cell) technology, installation techniques consistent, 4 projection output brightness of 800 lumens of 60-inch display unit, and individual 3200 lumens projector projection 120 inch screen brightness is consistent before; in addition, the larger the screen, the greater the distance of the projector, especially rear projection, is in reality site.
Second, multiple window display of multiple signals at the same time, such as to display four 1024 * 768 signal, to ensure the integrity of the signal appears to not be compressed, requires the resolution of the display must be greater than 2048 * 1536 more signal, the screen resolution is higher, obviously not mosaic display will not be able to solve this problem. In this State, the display resolution of the image quality in the display resolution meetthe premise only with image signals, such as unit is made up of 1024 * 768 2 * 2 mosaic screen resolution is 2048 * 1536, displayed a 1024 * 768, its screen 4 point display signal 1 point, its quality and not be higher than a 1024 * 768 unit display resolution quality, so that mosaic display will increase the display resolution quality point of view is wrong.
After a long development, add-on shows the wall, just vote for on-site installation and splicing, rear-projection field installed stitching, box unit stitching, PDP (plasma) mosaic wall, LCD (LCD) display wall, etc. The first three are the projection technology after stitching, two-screen splicing.
Projection technology is the key point is the concatenation projector technology and screen technology and installation (positive vote for rear-projection)
Rear-projection screen is the main settlement of interference problems before the brightness, the gain of the screen, projector and other technical terms (cell) technology, installation technology and consistent in dark darkroom, just vote projection effect is the same, of course, because of the rear-projection screen technology development, its rear-projection screen displayed results are better than ordinary projection screen, in recent years, there are the rapid projection screen technology, a strong positive projection screen, Black Gate, projection screen, and so on, so that positive vote screen technology greatly development, which has the effect of direct pursuit of rear-projection screen effects, depending on the scenario, the effect is even more than ordinary projection mode. But because of the audience, screen and projector are space location between limit, as have the concatenation is only applicable to single-line stitching, up to two rows of stitching.
Based on the use of the projector (projection traverse) description of the different, can be divided into CRT (cathode ray tube), single-chip LCD (liquid crystal), three slices of LCD (liquid crystal), single-chip DLP (digital micromirror chip DMD), three-chip DLP (digital micromirror chip DMD), LCOS, Sony's SXRD, original JVC Hughes of light valve, etc. Of these, now single-chip LCD (liquid crystal) and JVC Hughes of light valve has not seen, CRT (cathode ray tube) with the earliest implementation of the technology, but because of its low output brightness, now in the majority of applications are rare, but the CRT (cathode ray tube) with other technology incomparable advantages: endless stepless color and no raster image effects that make it incredibly superior image quality, in a very high-end simulation of reality system was also used. Generally LCD (liquid crystal) colorful degrees than DLP (digital micromirror chip DMD), single-chip DLP (digital micromirror chip DMD) than three DLP (digital micromirror chip DMD); However, the single-chip DLP projector (projection traverse) price relative to triple DLP projector expensive, and therefore also the most widely applied. Triple DLP (digital micromirror chip DMD) only in high-end applications will see. And SXRD, LCOS as emerging technology, prospect.

Based on the use of different types of screen, soft is cast as the curtain, hard cast curtain, soft rear projection screen, hard rear projection screen. Soft is usually positive vote curtain cloth coated glass beads, white plastic, metal powder, etc.-based mixture, often in combination with frame fixed, usually screen projection for the whole screen, display the image stitching unit. Rigid cast curtain curtains are usually rigid plastic-coated with a special mixture or directly paste made of special material membrane, now hard being voted virtually the whole screen curtain (large screen are on-site production installation), soft rear-projection screen is made of special plastic cloth, and also the whole screen forms, rigid rear projection screen due to cost constraints, particularly transport, usually uses the screen mosaic approach, using cheap Neillens rear projection screen due to perspective, the mosaic will not allow screen is too large, simple concatenation in General not more than 150 inches, N * M (such as greater than 3 * 4) multiple unit stitching in General not more than 80 inches, now also with special material membrane made of rigid rear projection screen in the form of the whole screen, such as the Black Gate curtain, DNP's overall screen, in fact it itself or mosaic production mode, only a very small slot, even not visible, and slot in the projection unit image displays slot none relationships, this tent can do have not sewn the edge and merged the concatenation.
As industrial production and production of add-on unit with rear projection box integration add-on unit,LCD, PDP plasma splicing unit stitching unit.

Rear projection box integration add-on unit

Rear projection box integration add-on unit of optical engine technology common three-chip chip LCD, DLP, and LCOS several (three piece with high-end tailored integration DLP rear projection box stitching unit, but extremely rare), a three-chip LCD optical engine mainly Barco, etc., using LCOS technology primarily for Hitachi, but most are based on single-chip DLP optical engine, mainly dedicated to producing single-chip DLP optical engine is formed, therefore in the market the most extensive application also.
Rear projection box integration add-on Unit screen body size. Currently on the market, the most common unit size is 50, 60, 67, 72, 80, 84, 100, 120 of greater size of the element is part. Rear projection box integration unit stitching, the slot is relatively small, at present, two units box physical slot is 1mm, there are manufacturers that has set its slot control in 0.5mm.
However, all projection splicing system there are still many shortcomings, first using more than one display unit stitching, the unit of projector (COB — — optical engine) electrical indicators attenuation is inconsistent, especially the lamp brightness falloff is inconsistent, use some time after the color vision and uneven brightness, image cross-screen display appears the "video", add-on unit, the more the more serious cases, because the rear projection box integration unit stitching Unit screen more so in rear projection box integration unit stitching the contradictions in the system, in recent years, a number of rear projection box integration modules splicing vendors on this issue sought to resolve road, auto-sensing calibration technology, but never actually solve this problem, the general good in the LCD, DLP 3 chip DLP better than single-chip DLP-edge Fusion splicing, due to the transition of color Fusion splicing Department, so the effect is much better than the hard-edged splicing. Also affect the rear projection display wall along the power consumption of products, projection system internal projectors (COB — — optical engine) glowing bulb General can only work 2000 hour? 8000 hours, at a later stage must put the cost of replacing the lamp, maintaining a relatively high. In addition, and thickness, the footprint is its biggest drawback.

Liquid crystal mosaic wall

Liquid crystal mosaic facade is the CRT curtain wall, DLP screen wall, PDP after the rise of the curtain wall and a wall mosaic products. Unlike traditional rear-projection-type (including CRT rear-projection, LCD and DLP rear projection) mosaic muqiangxiang ratio, LCD liquid crystal mosaic wall heat small, no radiation, non-flashing, not hurt the eyes, do not contain harmful substances (e.g. lead, mercury, cadmium and hexavalent chromium), is a new generation of environmental health mosaic wall with high definition, high brightness, high color gamut of features. Current LCD display wall most common LCD panel size of 40 and 46, 82 inches, it can according to customer need arbitrary splicing.

LCD technology is by far the most superior one flat panel display technology, with more than 50000 hours service life and longafter the image stabilization is not changed in any way. Liquid crystal display technology, no need for regular replacement of supplies equipment, maintenance and repair costs are very low.
However, since the LCD backlight glow products still used cathode vacuum tube (CCFL), its both ends of the filament lamp tube and pipe, block limits the size of LCD panels, single screen small is not enough for that product; in addition, liquid crystal mosaic wall's biggest drawback is that there is a large slot, 40 inches below the minimum is 10mm, spell up to 20mm, 46 inch, is to tailor up 30mm, 60mm, seriously affect the Visual effect, generally only in the distant view display use, such as advertising, publicity, since the effect of the screen than the projection display, less investment than plasma splicing, so I still have a certain market, the requirement to display multiple images, such as road monitoring command as a secondary display screen on both sides, the effect is very good.

PDP mosaic wall system
At present, only in Korea and Europe Lian the company developed for splicing of 42-inch plasma panel M-PDP, Europe Lian unique DZF (Dead-ZoneFree) process, the successful removal of normal plasma panel around 3 ~ 4 cm wide glass edge, the so-called "shows the dead zone", a screen edge every pixel can be clearly displayed. Mosaic, the display unit, and diameter shorter than 3 mm gap between the best plasma splicing effect, curtain wall picture perfect.
Europe Lian plasma display, plasma display technology is an emerging technology, with high brightness, high contrast, high color saturation, color uniformity, long life, average non-fault time is short, etc., present in many occasions have application, with a very good visual effects. It also has shown a clear and visible area is large, the zoom is adjustable, colorful, bright and very thin body (usually 7-10CM), have long performance life. Europe Lian new model 4220 more plasma unlimited mosaic display wallperfect version, on the basis of the original model, the Assembly of gap narrowed at 2mm following, contrast 10000: 1, and the original models only 3000: 1, brightness up 1000cd/m2, the installation's overall thickness of only 18cm..
The current PDP plasma special mosaic screen, unit resolution is not high, only 853 (H) x 480 (V). Other plasma displays the computer image or a static image if no image automatic micro-displacement technology easy burning, its reliability compared to other products, power consumption is relatively high, life expectancy is natural enough, and at an altitude of 2500 m above the normal work;