Video wall controller Np Pro is a video wall splicing processing device launched by ismec for 4K signal transmission and display, which can realize 4K@30 ultra-high-definition signal on the splicing wall without losing frames and high-quality display

HDMI (High-Definition Multimedia Interface) is a proprietary audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device, such as a display controller, to a compatible computer monitor, video projector, digital television, or digital audio device.

Specification:

The HDMI specification defines the protocols, signals, electrical interfaces and mechanical requirements of the standard. The maximum pixel clock rate for HDMI 1.0 is 165 MHz, which is sufficient to allow 1080p and WUXGA (1920×1200) at 60 Hz. HDMI 1.3 increases that to 340 MHz, which allows for higher resolution (such as WQXGA, 2560×1600) across a single digital link. An HDMI connection can either be single-link (type A/C/D) or dual-link (type B) and can have a video pixel rate of 25 MHz to 340 MHz (for a single-link connection) or 25 MHz to 680 MHz. Video formats with rates below 25 MHz are transmitted using a pixel-repetition scheme.

Audio/video

HDMI uses the Consumer Electronics Association/Electronic Industries Alliance 861 standards. HDMI 1.0 to HDMI 1.2a uses the EIA/CEA-861-B video standard, HDMI 1.3 uses the CEA-861-D video standard, and HDMI 1.4 uses the CEA-861-E video standard. The CEA-861-E document defines "video formats and waveforms; colorimetry and quantization; transport of compressed and uncompressed LPCM audio; carriage of auxiliary data; and implementations of the Video Electronics Standards Association (VESA) Enhanced Extended Display Identification Data Standard (E-EDID)" On July 15, 2013, the CEA announced the publication of CEA-861-F, a standard that can be used by interfaces such as DVI, HDMI, and LVDS. CEA-861-F adds the ability to transmit several Ultra HD video formats and additional color spaces.

Version

HDMI devices are manufactured to adhere to various versions of the specification, in which each version is given a number or letter, such as 1.0, 1.2, or 1.4b. Each subsequent version of the specification uses the same kind of cable but increases the bandwidth or capabilities of what can be transmitted over the cable. A product listed as having an HDMI version does not necessarily mean that it has all features in that version, since some HDMI features are optional, such as deep color and xvYCC. Since the release of HDMI 1.4, the HDMI Licensing LLC group has banned the use of version numbers to identify cables. Non-cable HDMI products, starting on January 1, 2012, may no longer reference the HDMI number, and must state which features of the HDMI specification the product implements specification the product implements.

As cost of hardware prices decreased, interactive video walls start becoming very popular in digital signage. To understand video wall technologies, we need to first compare the two main technologies, LED (Light Emitting Diode), and LCD (Liquid Crystal Displays). Until a few years ago LED technology was mostly used in outdoor displays, where it was required to “fight against sunlight” and be seen by observers far away of it. This selection was natural as LED displays are brighter than LCD with standard backlight.

In the last couple of years, LED manufacturers start producing very high resolution with a dot pitch (or pixel pitch) of less than 1mm, making it also a great option for displays where observers are close to the display lighting and staging. The first big question is who needs that. As digital signage technology continues to expand, digital displays are exponentially increasing in size. 664 LG 55-inch LED flat panel displays, supporting a resolution of 32,051 pixels wide by 7,941 pixels is the largest video wall in the world is “Suntec Singapore convention & exhibition centre”.

Fig: Suntec Singapore Convention and Exhibition Centre

So, things are getting big…really big. Video walls aren’t just made for a giant billboard, It can also be used in a variety of places where disseminating information is important and advertising is possible. This can include:

• Auditoriums
• Atrium’s
• Broadcasts on-air
• Concerts and events
• Museums
• Retail
• Universities
• Corporations
• Hospitals
• Casinos
• Hotels

Fortunately, there are a full range of digital signage technologies you can leverage for a video wall solution that works best for your business.

One additional detail you need to consider is the type of digital signage hardware you will be using. Higher-resolution LED is quickly catching up to LCD in popularity due to a decrease in the cost of manufacturing. The two best options for a video wall are direct view (DV) LED displays and ultra-narrow bezel LCDs. Before deciding on which works best for your video wall, you should understand the technologies and costs associated with each.

DIRECT VIEW LED DISPLAY:

A wall of videos isn’t an easy thing to accomplish and it requires smaller units working together to create a bigger picture. Direct view LED displays are comprised of several smaller LED screens mounted on a flat panel as like having more tiles in a mosaic. LED stands for “light-emitting diode” and unlike LCD screens, the LEDs in DV displays produce light themselves. Each LED acts as a tiny bulb that emits color when electrically engaged. Rather than back lighting the images, the LEDs are actually producing them.DV LED displays originally started out as monochrome and were often used in outdoor digital signage. When RGB color LEDs hit the market in the late 90s, everything changed.

Fig: This figure shown a lot of small tiles create a giant mosaic

View isemc video wall products

The Video Wall Mount offers a simple, cost-effective way of building video wall arrays from the most common to the most unique configurations. Mounts are designed to make exact alignment of each display easy. Fine X/Y/Z axis adjustment capabilities provide precise display alignment in all four corners without tools. Height and width can be adjusted with millimeter precision for edge-to-edge mounting. The final result lies closer to the wall than most other products on the market. Each display mount can be secured with screws (included) or with padlocks (not included) to increase public safety and reduce the risk of theft.

As a professional, you want to be able to install a video wall quickly and easily. Mounting requires precision: all of the displays have to fit together seamlessly. Even in an environment that is not perfect. That's why our video wall solutions are intelligently designed. You can easily align each display on the X, Y and Z axis, and after installation the displays remain easily accessible for maintenance.

In addition, the attractive design of our solutions blends into every environment, which is important for many clients and interior architects. Whether against the wall, on the ceiling, on the floor or freestanding, we have the right video wall solution for every situation.

Here are have 3 kind of bracket we used usual:

Wall mounted front maintain

This advantage is good for fix or change the screens if one of them have problem,You can press and it will pop-out,So you can easily pull out which screen need to fix or changed

Back mounted front maintain

The advantage is stable of this kind of bracket,And the cost is cheap also.

Stable performance,suitable working for a long time

Base support

Not all the video wall can be installed with the strong wall,Or maybe it for retail market,So you can choose the base support,That is can be move the location,more flexible.

You can buy those bracket in your local market,and we can supply it as your requirement also.

Check out our latest video wall equipment

iSEMC NP pro video wall controllerwork well with the function like Recording & Playback Function,Multimedia Storage And Publishing,Electronic Map,KVM,Super Long Running Time,Linkage Alarm...That’s will help you a lot in Security project!

When shopping for surveillance security systems (recorders or cameras) you’ll definitely stumble upon H.264 and H.265. What those terms mean? Many people might associate H264 to security camera system. Many of the DVR and NVR we sell have H264 printed on the box or displayed at the system’s initial boot. But in reality, many of the higher quality videos, streamed online, uses H264 compression. H264 is the method of video compression that compares the motion in encoded image vs the stationary objects.

H264, Advanced Video Encoding, provides a good video quality at considerable lower bit rate than previous standard video protocols: MPEG-2, H263, and MPEG-4 part 2. There two things needed for H264 to work appropriately. 1) the devices capturing the video must be able to properly encode videos. 2) the playback device must be able to also decode the H264 videos back to playable video format. Since there is no standardized format for H264 and many different companies hold different patents, each security camera system might encode their H264 in various ways. That is why, each security system has generic files for their H264 compress videos.

H265 or High Efficient Video Coding, is new standard video compression that provides even more improvement than H264. H264 provides improved bit reduction of 57% at 1080p and 64% of UHD or 4K compare to H264. Since all our devices, smart phones to smart TVs, are recording or displaying at much higher resolution, it is even more important that we have HEVC compression. Many of the popular streaming website have encoded all their videos to HEVC or H265.

If you’ve started researching display types, you’ve probably encountered some terms like LCD, Projection cubes, Direct view LED and so on. So, which one is right for you? Well, that depends. Every display technology has unique strengths and weaknesses, and will be better-suited to some applications than to others. To help you get started, we’ve created a quick guide to the four leading display types.

LCD Video Walls

LCDs (liquid crystal displays) are one of today’s most popular display options. You’re probably already familiar with LCD technology due to its widespread use in consumer electronics like smartphones, computer monitors, and television screens.

LCDs Work

An LCD is a flat panel display composed of a layer of liquid crystal between two pieces of polarized glass. When an electric current is applied, the liquid crystals shift, allowing light to pass through to create an image. Liquid crystals don’t produce their own light, so backlights are arranged behind the glass to illuminate the display.

Common Applications of LCDs

• Control room operations
• Education and research
• Conferencing and presentations

Direct View LED Video Walls

Direct view LED, also simply called “LED,” has recently emerged as an exciting new indoor video wall display type. Direct view LED isn’t actually a new technology: it’s been used for decades in large, outdoor signage, but has traditionally lacked the resolution needed for close-proximity indoor displays. All of this changed with the recent development of very small LEDs, which have allowed manufacturers to produce much higher-resolution LED displays. Today, direct view LED is one of the most desired display options for indoor video wall systems.

Direct View LED Works

An LED display consists of hundreds of tiny LEDs (light emitting diodes) mounted directly on a flat panel. Each LED is essentially a miniature lightbulb that emits colored light when a particular voltage is applied to it. Clusters of red, green, and blue LEDs are grouped to create the full-color pixels needed to produce an image. Displays with very small LEDs and a fine pixel pitch will produce higher resolutions than displays with bigger LEDs and a large pixel pitch. However, these higher-resolution displays are also dramatically more expensive.

Common Applications of Direct View LED

• Large scale architectural and signage displays
• Control room operations

Blended Projection Systems

Blended projection systems combine the output of multiple projectors to produce an image that is larger or higher-resolution than could be generated by a single projector. Blended projection systems can display high-resolution images on a completely seamless surface of virtually any size and shape.

Blended Projection Works

Blended projection works by overlapping two or more projected images and gradually cross-fading their edges to produce a single, seamless image. A blended projection system can be designed with rear or front projection. In a rear blended projection system, the projectors are placed behind the screen in an enclosed room, where they either project light directly onto the screen, or onto mirrors that then reflect it onto the screen.

Common Applications of Blended Projection

• Simulation
• Education and research
• Architecture and engineering

The full name of RS232 interface is "Technical Standard for Serial Binary Data Exchange Interface Between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE)". The standard stipulates that a 25-pin DB25 connector is used, the signal content of each pin of the connector is specified, and the level of various signals is specified. The DB25 serial port generally only uses three pins 2 (RXD), 3 (TXD), and 7 (GND).

With the continuous improvement of the equipment, the DB25 pin is rarely seen now, and the DB9 pin is used instead. For the interface, the pins used by DB9 are different from those of DB25. They are 2 (RXD), 3 (TXD), and 5 (GND). Therefore, the RS232 interface is now called DB9.

Since the RS232 interface standard appeared earlier, it is inevitable that there are deficiencies, mainly as follows:

(1)it is incompatible with the TTL level, a level conversion circuit is needed to connect with the TTL circuit.

(2) The transmission rate is low. In asynchronous transmission, the baud rate is 20Kbps.

(3) The interface uses a signal line and a signal return line to form a common ground transmission form, which is prone to common mode interference, so the anti-noise interference is weak.

(4) The transmission distance is limited. The standard value of the maximum transmission distance is 50 feet. In fact, it can only be used at about 50 meters.

RS485 has several advantages over RS232:

(1) The electrical characteristics of RS-485: Logic "1" is represented by the voltage difference between the two wires as +(2-6) V; Logic "0" is represented by the voltage difference between the two wires as -(2-6) V Said. The interface signal level is lower than RS-232, it is not easy to damage the chip of the interface circuit, and the level is compatible with TTL level, which can be easily connected with TTL circuit.

(2) The highest data transmission rate of RS-485 is 10Mbps.

(3) The RS-485 interface is a combination of balanced drivers and differential receivers, with enhanced anti-common-mode interference capability, that is, good anti-noise interference.

(4) The standard value of the maximum transmission distance of the RS-485 interface is 4000 feet, which can actually reach 3000 meters, and the RS-232 interface only allows one transceiver to be connected on the bus, that is, single station capability. The RS-485 interface allows up to 128 transceivers to be connected on the bus. That is, it has multi-station capability, so that users can use a single RS-485 interface to easily establish a device network.

The communication on av over ip has RS232, RS485, IO/IR, relay

Because the half-duplex network composed of RS485 interface generally only needs two wires (we generally call it AB line), the RS485 interface adopts shielded twisted pair transmission.