How to place the projector is a science, and now Xiao Bian talks about the inner points of this learning for everyone, helping users to better install the projector products placed in their own home, the five ecstasy posture with you!
Front projection, rear projection, suspended shooting, and desktop are four kinds of projection methods that the projector can support. The four are mutually overlapping, that is, if a machine only supports hanging and rear projection, it means this machine. The rear projection can be carried out by lifting or table top, but not any kind of front projection. If a machine does not support hanging shots, it means that this machine cannot use the lifting method either for rear projection or for front projection. It can only be used on the desktop. Specifically, the front shot corresponds to the rear projection, and the drop shot corresponds to the desktop.
Direct projection
Front projection, also known as front projection, is the most widely used and most projector-supported installation. The so-called positive vote refers to that the audience and the projector are on the same side as the projection screen. There is no reason why such a wide range of applications are being made.
advantage
1. Save space
The reason why consumers buy projectors is mostly because projectors can project larger images in smaller spaces. To obtain the largest possible projected area, one of the most important methods is to increase the projection distance as much as possible, in addition to using a wide-angle lens. Since the viewer and the projector are on the same side, the ideal situation is that the projection distance is equal to or even greater than the viewing distance of the viewer, so that the projected area can be maximized. From another point of view, to obtain the same projected area, the positive projection will save space than the rear projection.
2. Low requirements for projection screen
The direct projection method is to rely on the projection screen to reflect light, so unless the image is demanding, as long as the general projection screen can meet the requirements, and even some people use a white wall is not a bad idea. Therefore, the positive projection method has very low requirements on the projection screen, flexibility and environmental adaptability, that is, most of the occasions can choose the positive projection method without hesitation.
Shortcomings
1 projection effect can not be perfect
This comparison is for the rear projection. If the audience's viewing environment is a brighter occasion such as teaching, training, conferences, exhibitions, advertisements, etc., the light path will suffer from light interference, the image will become blurred or the color will appear distorted. If the reflection deviation of the projection screen is considered Inside, the effect is hardly satisfying.
2. Affect the environment
Because the projector is on the same side as the audience, the appearance, interface, and wiring of the projector are all exposed. Even projectors that use a wireless network connection can only reduce the portion of the wiring associated with the network connection, and most of the basic wiring still cannot be saved. Whether it is a family, a classroom, an office or a demonstration hall, a lot of messy wiring will make a lot of noise. Therefore, projectors that are being projected generally use hoisting to solve this problem.
Summary: The forward projection method is generally applicable to general situations, and is most suitable for use in a dark environment (such as a movie theater). However, if the image quality is concerned, it cannot satisfy the needs of high-end users. In addition, spider-like signal lines are also difficult to accept. Although there are currently wireless transmission models, they are not standard and must be purchased separately. If you can only shoot directly, you can also choose a home projector with wireless transmission. In this way, only one power cord is required, and the others are connected. Lines can be hidden.
Desktop placement
Although the desktop projection does not look very beautiful, but you can save those tedious steps, you only need to prepare a table, you can also buy some dedicated mobile projector frame to put the projector, put the projector up , Connect the cable to achieve large-screen projection.
Advantages: convenient, quick, economical, and convenient to adjust the shift.
Disadvantages: Affected by the room environment, it is easy to touch the projector or kick the wire.
Rear projection
In addition to the traditional rear projection TV rear projection, now more and more projectors also support this installation. The so-called rear projection refers to the separation of the audience and the projector on both sides of the projection screen. Why do so many projectors support rear projection?
advantage
Good projection effect does not affect the appearance
In the rear projection mode, the viewer sees transmitted light, thus avoiding the blur caused by the reflection of the projection screen. Moreover, the projection light usually propagates in the closed dark room, which greatly reduces the light interference, and the projection effect rises again by one level. In other words, the only interference is only between the audience and the projection screen. It can be said that the rear projection method has both the advantages of a large projection area of ​​the projector and the clear and bright advantages of the rear projection television. Although the rear projection type is also lined, all the lines can be hidden in a dark room. The so-called eye is not a net. Naturally, there is no problem of damaging the environment. In addition, if the dark room is embedded in the wall, the entire room becomes more stylish.
Shortcomings
1. Take up a lot of space
As mentioned in the above projection, to project an area of ​​the same size, the theoretical rear projection needs to be twice as deep as the front projection, which imposes higher requirements on the application site. This is the biggest factor hindering the development of rear projection. In fact, to solve this problem is not without a solution, rear projection refraction is one of the most commonly used methods, after one or more reflections and then projected onto the screen, thereby reducing the depth distance, saving space.
2. Small projection area
The small projection area makes the rear-projection way suffer from the front and back: On the one hand, it is under pressure from a large area of ​​positive projection. On the other hand, it is oppressed by the rear projection TV market. It can be said that it is difficult to grow in the slit.
Summary: The rear projection method is suitable for those with high requirements for image quality, as well as applications in luxury environments and venues. For home theater installations, rear projection installation is not recommended. Although there are ultra-short-focus lenses at present, it is still not recommended, especially behind the curtain. It is also more troublesome to change lights later.
Hanging
Drawcasts correspond to desk projections (also known as desktops), and both front and rear projections can be used for both front and rear projections. The so-called suspended shooting refers to the installation of a hanger and the fixing and lifting of the projector to the ceiling with screws and bolts. The desk type is to place the projector on a horizontal surface in the room, the main difference between the two is fixed or not. Some people think that the table can be moved freely. Is that not more convenient? In fact, otherwise, in general, the installation of a suspended installation outweighs the disadvantages.
advantage
1. Reduce projector costs
Because there is no need to move, the weight and size of the projector appear to be irrelevant, which indirectly saves the user's investment in portability. In other words, if the user chooses to use the hanging
When it comes to models, you can choose some "bulk" and more affordable projectors without any derision. In addition to the high price/performance ratio of the same portable model, the huge size of the projector has much better heat dissipation performance. Moreover, the fixing prevents the projector from being "scratched", especially during normal operation. The vibration of the projector directly causes the filament to vibrate, which is tantamount to suicide. Extending the lamp life is also an important means to reduce the cost of the projector.
2 easy to adjust the projection angle and position
Although the projectors are equipped with a vertical trapezoidal correction function, the correction function is at the expense of the quality of the image, so it can be used as little as possible. Therefore, when installing, you should try to make the center point of the projector lens and the center point of the projection screen on the same horizontal line. However, with a desktop-mounted projector, the center point is always below the center point of the curtain, so vertical trapezoidal correction is inevitable. Another installation requirement is that the projection light should be perpendicular to the projection screen, otherwise horizontal trapezoidal distortion will occur, and horizontal trapezoidal correction is required, which is a luxury function supported by high-end machines. Therefore, as long as the projection distance and center point are clearly calculated when lifting, it is possible to avoid frequent shifting and correction in the future. Therefore, it seems that it is inconvenient for the fixed lifting. In fact, it saves a lot of effort.
3 conducive to the line arrangement
Although the lifted projector tends to give people a sense of abruptness, its wiring can be passed through the slot or through the center of the bracket to the ceiling. And the fixed lifting can be planned in advance when the civil works are planned. This is also unmatched by the desktop model.
Shortcomings
1. Signal attenuation
Lifting the projector is usually far from the signal source, and taking into account the circuitous twists and turns, then the signal cable is more than 15 meters is very common, but beyond this transmission distance signal transmission caused by the input projector signal attenuation , The projected picture will have blur tails and even jitter. To do this, a signal amplifier must be added to the signal source.
2. Inconvenient daily maintenance
The chances of the projector being fixed and removed are very small unless there is a malfunction. Therefore, routine maintenance such as dust removal, filter change, and cleaning the lens is usually ignored, which will reduce the life of the projector. In addition, replacing the bulb is also a chore.
3. Installation needs to be carried out by professionals
In order to ensure a reliable installation, it is generally required to be installed, fixed, and adjusted by a professional. In addition, the hangers necessary for lifting must be of the right size and the screws and bolts must be matched. This part of the accessories is often monopolized by the manufacturers, and users can only accept them with reluctance.
Summary: Drop projectors are suitable as projectors for fixed use. They are most suitable for use in classrooms, demonstration halls, and airports. Of course, if the floor is too high to be suitable for lifting occasions, then you have to use the desktop.
In addition to the four methods mentioned above, we are now slowly entering our eyes.
Side cast
Side-shooting is an installation method that has only emerged in recent years and is usually paired with a desktop. Some demo halls that did not have a projector installed did not reserve the location of the projector. Even if the projector was temporarily forced to hang the projection screen, the projector had no place to stay. At this point the side-shooter comes in handy: the projector can be placed in the correct direction with the projection screen. Just adjust the horizontal trapezoidal correction to restore the screen to normal.
The projectors that support the side-projection function will generally be slightly more expensive. At the same time, the projectors are not widely used because they are not very mainstream projection methods. They are not widely used, and they are mainly suitable for temporary use in some situations that do not have a projection environment. In addition, due to the fact that the technology is still not mature enough, when the screen is adjusted, the brightness of the screen will be lost, and the overall picture quality will be slightly reduced. However, the overall view does not affect the normal viewing and is sufficient to meet the public viewing needs. Moreover, placing the machine at a corner does not affect the environment. Placing the machine on the side can hide the wire.
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