LED video wall

The LED video wall or LED screen is a direct vision LED display. In it, LEDs are used not as a source of light but as separate elements of a picture (pixels). Previously, manufacturers could not make a matrix with a small pitch of small LEDs, so LED screens were used on large venues, for sports scoreboards, large exhibition displays, concerts where high picture quality is not required. However, to date, manufacturers already offer various versions of LED displays, designed for around-the-clock use in video walls for a more custom format, in control rooms and situational centers. Their main advantage is high image brightness, low noise level, a thinner body, almost no visible seam and greater color uniformity.

To opt for one of the options for the implementation of the video wall, you must first understand whether the benefits from the introduction of the LED video wall overlap the negative aspects, and whether such a video wall will fully meet your objectives.

Pixel pitch

The pixel pitch primarily affects the perception of the displayed content from a specified distance. But it is not unimportant to consider that the pixel pitch of the video wall also affects the amount of information that can be displayed on the screen.

Often the pixel pitch is confused with the screen resolution. The pixel pitch measures the distance between the center points of two adjacent pixels, and the resolution is the total number of pixels in width and height of the screen. If you increase the diagonal of the display, the pixel pitch also increases, provided that the overall screen resolution remains constant.

Acceptable pixel pitch must be in the range of 0.6 to 1.3 mm. If the pixel pitch is too large, the fonts will be read worse, and the amount of information that can be displayed on the video wall will be limited. The pixel pitch may increase so much that viewers will be able to distinguish individual pixels and the space between them, which will adversely affect the ability to perceive information.

Price

On average, when calculating the cost of video walls, it can be assumed that the LED version of a video wall with a step of 1.5 mm costs about three times more than projection cubes of comparable size and brightness. It is also necessary to take into account the complexity of the installation of the LED video wall and, therefore, the cost will be higher than the installation of projection cubes. For mounting the LED screen requires a complex installation design.

Life time

The service life of LED screens is often much shorter compared to the video walls of other performance technologies. For many new models, it is significantly less than 100 thousand hours. For comparison: LED projection cubes are designed for 80-100 thousand hours. In other words, if the panel is designed for 50 thousand hours of work, then a threefold difference in price will actually mean an increase in expenses by 4-6 times.

To date, the LED screen remains a very expensive technology.

Power consumption

Manufacturers of LED displays talk about low power consumption of their devices, but you need to bring everything to a common denominator.

Different levels of brightness can be set on LED screens and projection cubes, so you should compare the same brightness and size. As a result, it turns out that projection cubes consume slightly less energy than LED displays. However, let's not forget that to display the same image, you will need a larger LED video wall. If you use a display with a pixel pitch of 3 mm, you will need 17 times more surface area and about 27 times higher power to display images with the same resolution as on the video cube.

Thus, the energy consumption of LED-systems in comparison with LED projection cubes is still excessively high.

Heat transfer

Heat dissipation affects the size and cost of the required air conditioning installation. When using the LED display on the existing control room, the total amount of generated heat will increase significantly, which will require replacement or upgrading of the cooling equipment. But it is also worth noting that since the LEDs of the LED displays are located on the outside of the screen, they do not need their own ventilation system.

Shell thickness

The undoubted advantage of LED displays is the smaller thickness of the shell when compared with video walls based on projection cubes. However, it should be noted that video cubes usually have front access, while on the LED display market, only models with rear access are being offered, which is why you have to design the mounting frame, taking into account the distance of several tens of centimeters from the wall. Therefore, the installation of these displays requires a distance not less and sometimes more than the width of the video wall based on projection cubes.

Thus, today LED technology has several advantages, however, it is necessary to take into account the calculation of the rationality of the use of such a video wall. It should also be understood for what purposes such a video wall will be primarily useful.

Nexgen providing industry leading video conference solutionsand facility in Chennai such us video conference Tandberg, Polycom, Cisco, polling and Logitech video conference systems and Room specialists for Video Conferencing.

We help to choose a projector

A brief overview of the main criteria for choosing a projector that will allow you to quickly and correctly select the projector you need for your premises

So, we will try to cover the main types of projectors on which you should stay, depending on which room you need to equip, be it a home lounge, classroom, office, meeting room, exhibition or assembly hall, concert hall, museum or movie theater.

A brief overview of the main criteria for choosing a projector that will allow you to quickly and correctly select the projector you need for your premises

So, we will try to cover the main types of projectors on which you should stay, depending on which room you need to equip, be it a home lounge, classroom, office, meeting room, exhibition or assembly hall, concert hall, museum or movie theater.

Projectors for small classrooms, classrooms, small conference rooms.

For small classrooms and classrooms that do not require particularly vivid images, portable projectors are best suited. They are compact and lightweight (from 2.5 to 4 kg), so that they are conveniently transferred from the audience to the audience and easy to install before the class begins. They will be the cheapest of the many proposals. The built-in zoom lens allows you to adjust the image size according to the area of ​​the wall or board. In this case, you should pay attention to the speed on and off, as well as energy-saving features (automatic brightness reduction, image shutdown). In pursuit of savings, it is worth considering the fact that, as a rule, cheap portable projectors use a short-lived lamp, which, if used frequently, uses the projector very quickly fails. The most annoying moment that lamp replacement will cost about 80% of the cost of the projector itself. Therefore, you should still consider the option a little more expensive, but with a long operating time and warranty period. It is also necessary to take into account the location of the projector so that there are no foreign objects in the gap between the projected surface (distance approximately equal to 2-3 meters). When avoiding interference does not work, you should consider more expensive projectors with a short focus.

Short-focus and ultra-short-focus projectors are ideal for small rooms with limited space. Such models can be installed in close proximity to a wall, screen or digital whiteboard. At the same time, they provide a clear image with a diameter of 2 meters or even more.

If you look at a screen or an interactive whiteboard on a mobile stand with such a projector, you can easily move the finished installation from one room to another within the same floor.

Do not neglect such criteria as energy-saving functions (automatic dimming, image shutdown); the presence of such functions will help reduce operating costs. A built-in zoom lens and features such as keystone correction provide projection of sharp, sharp images that are exactly the size of the board or wall. Wi-Fi-enabled projectors can be connected to a laptop or tablet without cables.

An excellent solution for business people who hold a large number of field presentations at the customer will be a pocket-type projector (mini projector). It will not be difficult to carry with them. The projector literally fits in the palm of your hand. The brightness and size of the projection will be sufficient for conducting presentations for a small public. Well, as a nice addition to long trips, this rojector can be used to watch movies in the evenings from a laptop or even a phone.

Projectors for large audiences and halls

If you equip a large audience, an installation projector will be an excellent option. The brightness of such projectors starts from 4,000. Such power allows you to display images without even closing the windows. Thanks to interchangeable lenses, a stationary projector can be installed anywhere in the audience, and the correction of keystone distortion and lens shift provides a realistic image with precise proportions. As a rule, such projectors are installed under the ceiling on special brackets, which allows to avoid interference with the projection. If you have the task of installing in a building under construction, or the room is undergoing a major overhaul, it is worth considering an option with a different execution of the projector installation. Sliding Ceilings,

Bright conference lights are required for meeting rooms and spacious conference rooms, the image of which is clearly visible even in daylight. In such cases, the best choice is a powerful ceiling-mounted installation projector with a brightness of 4,000 lumens or more. With a wide range of interchangeable lenses, the proportions of the projected image can be adjusted to the projector precisely according to the size of the room. In very large rooms, you can use not one projector, but two or more: the function of combining the edges will create one huge picture from several images. If the projector is supposed to be used frequently and for a long time, it is recommended to consider laser models: they are economical and practically maintenance-free.

Projectors for museums and exhibitions

Museums, art galleries and other public spaces require projectors for visualization and modeling. Interchangeable shift lenses provide a large image with precise proportions, regardless of where the projector is installed. Among other advantages, laser projectors are distinguished by a long service life, and they do not lose brightness over time, require virtually no maintenance and additional costs. In addition, these projectors are equipped with the function of combining edges, which combines projections from two or more devices into one huge high-resolution image, and the technology of image deformation opens up broad creative possibilities, providing a projection on curved and uneven surfaces.

Home Cinema Projectors

Such projectors provide the best image quality in darkened living rooms, basements and special rooms. The zoom lens allows you to precisely adjust the image according to the size of the room. As a rule, all home theater projectors support Full HD resolution, and some 4K format, which ensures image quality at the level of professional movie projectors. Resolution technology will improve the quality of Blu-ray ™ and DVD movies to 4K, and the Reality Creation feature will do the same for 3D video. Motion flow technology eliminates blur, providing a consistently clear image. New models of projectors support even movies shot in HDR (high dynamic range mode) and characterized by particularly high contrast, as well as an increased number of brightness levels. For convenience, the settings you set can be saved in order to then recall them from memory: this way you can easily create your own viewing modes for different filmmakers. The pleasant moment will be that such projectors are practically silent. It is worth being prepared for the fact that during the days of football broadcasts your friends will gather under any pretext.

 Cinema Projectors

Powerful digital cinema projectors should provide image brightness from 9,000 to 30,000 lumens. Digital 4K film projectors have twice the resolution than older 2K models, which is more than four times higher than Full HD, so viewers won't see any pixilation even from the front rows. There are other features that improve image quality that you should pay attention to. For example, the SXRD optical hub in Sony models provides rich realistic colors and an unprecedented contrast ratio — up to 8,000: 1. Due to this, bright areas of the image look even brighter, and dark - deeper and richer. In some models, not one xenon light source is used, as in conventional film projectors, but a robust design of several high-pressure mercury lamps, which guarantees that even if one of the lamps fails, the film will not be interrupted. This design requires almost no maintenance and is less energy-consuming than xenon projectors, so you save on electricity.

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IP CCTV camera

Why IP cameras for video surveillance are gaining popularity and what types of IP cameras do exist in our article.
In recent years, IP cameras for video surveillance are gaining popularity. For IP cameras do not need additional equipment - each camera is independent in itself and can work without additional devices. Poe technology allows you to supply power to the IP-camera via Ethernet-cable.

Types of IP camera

For different purposes, different types of IP cameras are used. Conventionally, they can be divided into three types:

• by installation locations
• by body type
• by lens type

According to the places of installation, the cameras are divided into outdoor and indoor.

Since street weather conditions are quite severe, a quality outdoor camera can operate in the temperature range from -50 to +50 degrees. Often c cameras use special heated thermometers. Outdoor cameras are also designed for high humidity and calmly withstand installation inside rooms such as a car wash. Increased performance dictate higher prices for this type of IP cameras.

Internal cameras are installed directly inside buildings . Such cameras are not designed to operate at very low or high temperatures and high humidity. Usually installed in offices or other premises to control the organization’s business processes. The advantage of such cameras is the price, which is significantly lower than that of outdoor IP cameras.

According to the type of the camera body , they are divided into cameras in a standard case, dome-shaped, PTZ cameras.

Cameras in a standard package are the simplest devices in a standard package. Can be installed both indoors and outdoors. For outdoor installation, a special thermoplastic is used, which protects against moisture ingress and low / high temperatures.

Dome cameras can be installed both indoors and outdoors. They have a body that visually resembles a hemisphere. Most often, an ip camera in this design is attached to the ceiling, less often to a wall. The hemisphere of cameras is often tinted so that the lens is not visible where it is directed.

PTZ cameras (PTZ-Pan-tilt-zoom) - a camera that supports remote control of the direction and zoom. This type of camera is convenient to use when you need to remotely rotate the lens of the camera, as well as zoom in on some fragments of the frame.

IP cameras lenses 

Camera IP cameras are divided into lenses with fixed focal length and variable focal length . On cameras with variable focal length, you can change the focus, which will either expand the viewing angles — get the overall picture, or focus on a smaller object in more detail.

When you need to decide what focal length to choose, you need to understand that the smaller the focal length, the less far-sighted your IP camera will be, but at the same time it will cover a larger viewing area. Conversely, the larger the focal length of the lens, the more detailed the frame from the camera will be, but the viewing area will be smaller. Wide-angle lenses are suitable for a general overview, such as car parking or a  conference room., and a greater focal length allows you to see a more detailed image that is required at cash desks in supermarkets or in banks to resolve controversial issues. Usually changing the focal length is a mechanical task. On the lens there are levers that allow you to change the parameters. On more expensive models, it is possible to change the focal length remotely.

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WHY DO WE NEED VIDEO CONFERENCING, IF YOU HAVE SKYPE?

Why do large companies choose video conferencing to streamline negotiations, corporate training and costs, rather than popular video chats? Read in our article about the benefits of video conferencing.

Almost every company has a question about optimizing the business process using modern technologies. Video conferencing is no exception; it allows you to optimize the time and money costs of the enterprise and quickly resolve issues with partners.

WHAT IS VIDEO CONFERENCING (VIDEO CONFERENCING)?

What is videoconferencing is, in general, clear from the name, but it is necessary to realize that video conferencing is more than just cameras, computer and software are equipment and technologies that, in combination, allow remote communication to be transferred to a high, qualitative level, often achieving a presence effect.

The professional video conferencing system includes the following elements:

High-quality video camera with high resolution.


During a conversation using a popular video chat, you often see a low-quality picture with unregulated illumination. Professional video camera with adjustable sensitivity and color reproduction, reproduces high-quality, detailed image of your interlocutor. As a result, you are not distracted from communication and perceive the interlocutor as if he is at arm's length.

Conference systems (microphones)

Conference systems have high sensitivity to ensure high-quality speech during negotiations, as opposed to a microphone on a telephone or computer. More details about microphones.

Acoustic systems

Sound equipment is installed only after the engineering acoustic calculations of the room. In conference rooms and meeting rooms use various types of equipment: ceiling acoustics, wall mounted, frontal. When using the latter type of acoustics, there will be an additional effect of the presence of a remote participant.

Acoustic data room.

This item is directly related to the above; Without decent room acoustics, the sound effect of presence cannot be achieved. Mainly edited and formed using interior materials during the repair.

Video equipment

This refers to video mapping systems of interlocutors (screens, monitors, panels). The transfer of visual content is most important during video conferencing, the quality of equipment plays the most important role here.

WHY DO I NEED VKS, IF YOU HAVE SKYPE?

The main differences are quality, reliability and capabilities.

The quality and level of video conferencing are directly related, as you have probably understood, from the installed equipment. A popular smartphone or even the latest version of the laptop with the best performance will not be able to broadcast video of a similar quality that is inherent in professional equipment, even if not a popular brand. When communicating via Skype, you simply see the interlocutor on your screen, the video conferencing system provides the effect of presence.

Reliability.

The actual problem for many organizations is the confidentiality of information. Unlike Skype, the videoconferencing system is protected from data “leakage” and listening, since all connections go through the client’s server, and the equipment is serviced by the company’s staff.

One of the main differences of video conferencing is the possibility of stable and safe operation, on weak communication channels, and vice versa, in local networks, where data transfer is very high.

Skype only works when connected to its servers via the Internet; that is, every time a connection fails, you will not be able to use the video connection all the time, until you troubleshoot. Imagine if this happens during very important negotiations with your partners or clients.

Opportunities

• demonstration of presentations, videos, photos, drawings, tables and any other multimedia materials during the conversation.
• during communication, an electronic board is available on which you can draw, enter and edit data.
• provides for the duplication of your desktop on the overall screen and desktop management of your interlocutor.
• video of negotiations and all data, if necessary.
• unlimited number of participants.
• the organization of the schedule of video conferences and invitations. By scheduling a conference, mark the date and time, and your interlocutors will receive individual emails.
• Integration with IP-telephony - the ability to call landline numbers, from the application for video conferencing, during the conference. Thereby providing a full audio participation of the interlocutor.

Of course, if you need a point-to-point video conferencing (two-way video conferencing), use extremely rarely and are not afraid of the “leakage” of information, then the most affordable and best option for you would be Skype or similar products.

But if the company is large, actively developing or planning to conduct training between the branches, you will need multi point videoconferencing. For the implementation of "multi point" you will need conference equipment that supports "multi point" (there is conference equipment with built-in up to 8 points) or a special video server. In more detail about the types of video conferencing, we will tell in the next article.

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Video conferencing equipment for real-world meeting rooms

Video conferencing has ceased to be an exotic concept and is increasingly penetrating our everyday work environment. She went beyond the meeting rooms and became available in the workplace of employees and mobile devices. This widespread use of video conferencing is facilitated by the growing transition from purely hardware solutions (such as Polycom, Cisco, LifeSize) to software and hardware. There are several reasons for this transition, but the main ones are as follows:

1. Software solutions for video conferencing are more affordable without losing functionality.
2. Software solutions for video conferencing provide greater flexibility in equipping workplaces and meeting rooms, in contrast to the standardized composition of hardware terminals.

This article, on the example of a specific meeting room, describes how it is possible to equip a room with video conferencing facilities that is simple and relatively inexpensive. 

The concept of a standard meeting room

The meeting room is now in almost any company. This is the place where meetings between employees, meetings with clients, discussion of projects are held. Recently, meeting rooms are also used for video conferencing with remote participants. The equipment of such meeting rooms allows participants to hear and see each other at a distance in real time, to share content (presentations, slides, videos). 

As a rule, meeting rooms have a metric of 25-30 square meters and a capacity of 8-10 people. These rooms are medium-sized meeting rooms.

Modular approach to equipping meeting rooms

Before turning to specific examples of equipment, you should talk about the modular approach. 

Today, equipping a meeting room with video conferencing equipment has ceased to be a highly specialized task. Previously, a hardware terminal with a predetermined composition of components was almost the only option for VKS equipment. Now the personal computer with the software client of the video conferencing center becomes the central hub, for example: Skype, Polycom Realpresence Desktop or TrueConf. 

Both of these options solve the problem - they provide participants with video calls, but they have different approaches:

1. The option based on a specialized hardware terminal involves placing typed equipment in a room — a video camera with the parameters offered by the manufacturer, a microphone, also a specific model, a central computing unit with certain functionality, and so on. Connectors for connecting equipment to the central unit are often proprietary. This makes it difficult to replace components. For example, the Polycom company produces video cameras with a non-standard HDCI connector, which without “dancing with a tambourine” is difficult to connect to anything other than the hardware terminals of the same company. This imposes certain difficulties in connecting cameras through a video switch, to build more complex video conferencing systems. The flexibility of upgrading and scaling in such hardware solutions is a bit
   
2. The option based on a personal computer, equipped in the simplest case with a video camera and microphone, gives more flexibility in choosing equipment, as the connection interfaces (USB, HDMI, 3.5 mm analog connector) are standardized and present in any modern personal computer.

The second variant of equipment embodies a modular approach to equipping a meeting room, which involves the separation of all equipment into several subsystems, the composition of each of which can be changed without losing the overall functionality. Video and audio signals of each of these subsystems are connected to the client terminal on the basis of a personal computer.

1. Subsystem technology television. In essence, this is a video camera system. For large conference rooms, several video cameras are needed to capture all participants in the video. In the case of an average meeting room, a single video camera with a suitable viewing angle, swivel lens and optical zoom (PTZ) is sufficient.
   
2. Subsystem display information. This may be a projector or a screen, but recently LCD panels are increasingly being used because of their availability and convenience - no need, as is the case with a projector, to specifically dim the room or periodically change light bulbs. When choosing a TV size, you should be guided by the following rule: the distance from the TV to the closest participants should be at least one diagonal of the TV, and to the farthest participant - no more than four diagonals. 
   
   It is clear that for a long room, based on this recommendation, you will need a large diagonal TV. In some cases, the best options for the display subsystem become a video wall or duplicate screens.
   
   Video wall - a set of display devices (projection video cubes, plasma or LCD displays), which are combined with each other and form a single screen that allows you to play large volumes of information from different sources in a multi-window mode. The issue of video walls is very voluminous and is beyond the scope of this article. But the main parameters that you should pay attention to when choosing a video wall are: its size in inches, the width of the seam between the panels (usually 5.5 mm), the mode of operation, video sources and the functionality that the video wall controller must implement. 
   
   When collaborating with documents, the use of auxiliary panels that duplicate an image from the main screen becomes much more useful than one big screen. In this case, you must use a video splitter.
   
3. Subsystem sound capture. The wide-directional frog microphones, which are part of the hardware terminals, are replaced by speakerphones - devices that combine an array of microphones and a speaker. They connect to a computer via USB and provide effective echo and noise reduction, as well as a large radius of sound capture. In addition, speakerphones have the ability to cascade into a circuit to expand the sound capture zone.
   
4. Subsystem sounding room. There are a lot of options - from speakerphones and loudspeakers built into the LCD TV and ending with ceiling loudspeakers that evenly sound the whole room.

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