LCD splicing screen technology applications at the mall

Supermarkets, department stores , specialty stores and other large establishments often have some discounts , events and other information, with its large screen LCD splicing screen , full HD , etc. can make these exciting places information in terms of how much space is to the fore, show to every one to patronize customers, thereby promoting consumption ; Meanwhile, narrow , ultra-narrow , seamless large-screen color lcd display module splicing system can also be advertised in the above large establishments , make the picture vivid and bright , bright delicate display even in a busy mall also stand out from the noisy environment , seize the attention of new customers to bring more new business opportunities !
LCD splicing screen application analysis :
1, large , high-definition lcd module video wall mosaic showing all the mall can be the perfect product , no matter in which area , space, angle can attract consumers with a good eye , user-friendly shopping needs ;
2 , Play product discounts , events and other information, to attract more users to the consumer, and thus bring more benefits to the mall ;
3 , shopping malls larger flow of people , can its excellent , perfect picture playback businesses product or corporate advertising , to the mall to bring additional advertising effectiveness.

Factory network video surveillance system analysis

Factory video surveillance system preliminary design to meet the needs of existing resources and network performance , front-end video capture subsystem , the monitoring center video management system construction are to meet the Ministry of Public Security "to carry out urban Security Alarm System Construction Work" performance requirements , and strive to run the system is stable , reliable data storage , archiving video data on a regular basis .
First, the video surveillance system to protect plant and public activity areas of staff safety , security equipment and other important facilities and property safety , prevention of sabotage activities, and accidents , the first time made ​​the process of incident recording, handling and accountability for the timely provide strong evidence .Character LCD Display This is the basic function of video surveillance requirements. Another important aspect of the video surveillance system can be factory daily production process , play a supporting role in the production , production line unattended .
According to government requirements and internal management of production safety regulations , and in accordance with the relevant national standards , combined with the plant needs to develop a network video monitoring video monitoring system functions to achieve the following objectives:
1 ) Video capture function: capture video front-end video capture system and follow the transmission requirements for compression , encoding , converts through Access Gateway , meet in a digital format of the information transmitted over the Internet exchange .
2 ) video transmission function: After compression, encoding video information , in accordance with the work flow in a factory dedicated network for transmission , according to the security management authority, constitute transmission network system at all levels . Same time be able to meet the monitoring system management needs, transferred to the superior system and stored.
3 ) The information processing functions : Distribution of the received video information system, etc., COG LCD Module according to the classification and attribution video processing, the call processing information stored .
4 ) video storage and backup functions: video monitoring center server information, system logs should be stored historical data storage and backup information is available in a network system based on permissions playback.
5 ) System Control Function : According to authorized users of the network control command sent to the front-end system, the monitoring center and authorized end users to call any way monitor images and control.

Nonlinear distortion of the video signal

Signal distortion caused in the transmission signal itself to be transmitted related to the amplitude ,20x4 lcd display this distortion , said nonlinear distortion between the input signal the output is not a simple linear relationship. Equation : U2 = K (U1) U1, the transfer function K (U1) is not only a function of frequency or time , and is a function of the input signal .
Nonlinear distortion caused by the nonlinear components , and their effect on the parameters with which the signal level is changed ( by the size of the impact signal level ) . Transmission system nonlinear dynamic range and signal related to a wide range of distortion from the signal components can be divided into the following:
· Luminance signal nonlinear distortion
· Chroma gain nonlinear distortion
· Chroma phase nonlinear distortion
· Chromaticity ,lcm module luminance intermodulation distortion
· Differential gain
· Differential phase distortion
And synchronization signal static nonlinear distortion
· Synchronous signal dynamic nonlinear distortion
6 line time waveform distortion
Reflecting the line frequency to 500KHz IF distortion , on behalf of the larger size of the image content changes in brightness in the horizontal direction , frequency distortion will cause the image horizontally ill , causing severe horizontal tail, somewhat similar to the RGBHV signals "LF response bad "fault.

Splicing unit slim and lightweight LCD liquid crystal mosaic

English full name of the LCD Liquid Crystal Display, LCD is the structure of two parallel glass in which the liquid crystal placed , two pieces of glass with a plurality of vertical and horizontal center of the small wire rod through the energization to control the crystal or molecular changes direction , reflecting the light generated screen.
LCD consists of two glass composition, thickness of 1mm, during which the liquid crystal material containing a uniform distance apart . Because the liquid crystal material itself is not light , so both sides of the screen with the lamp as a light source , and in the back there is a backlit lcd module panel ( or even light panels ) and reflective film, backlit panels are composed of a fluorescent substance can emit light , its main function is to provide a uniform background light .
Light emitted by the backlight passing through the polarizing filter layer after the first layer containing the liquid crystal droplets thousands crystal layer . The droplets of the liquid crystal layer are included in the small cell structure, one or more cells constitute one pixel on the screen . Between the glass and the liquid crystal material is a transparent electrode , the electrode is divided into rows and columns , the intersection of row and column , the voltage is changed by changing the optical state of the liquid crystal , the liquid crystal material acts like a small light valve .
The liquid crystal material is the control circuit portion and a peripheral driving circuit portion . When the LCD of the electrode generating an electric field , the liquid crystal molecules will be distorted , and thus will pass through one of the refraction of light in a regular , and then through the second layer of the filter layer filtering is displayed on the screen .
The LCD is only in recent years developed a splicing technology , its greatest advantage is its low power consumption , light weight , long life, no radiation, screen brightness uniformity , OLED Module etc., but the biggest drawback is that LCD larger patchwork . Only a fraction of a millimeter and DLP patchwork is unable to compete . The display requires very sophisticated users, a little bit of regret , which is currently only occupy LCD splicing key factor in low-end market .
To reduce patchwork , patchwork gives users reduce the interval sense , LCD manufacturers have been stitching also constantly work with. In recent years , has introduced a more narrow patchwork LCD splicing unit , from the initial 7.3mm, to 6.7mm, and then in 2011 launched a new 5.5 mm LCD splicing unit , lead the way , and continue to get a breakthrough in terms patchwork , setting off a wave of LCD splicing again and again .

Touch screen use and maintenance points

Due to technical limitations and equipment in different environments, as water droplets on the screen, dust and other contamination does not work properly, so the touch screen is also the same as with ordinary machines require regular maintenance. And because the touch screen is a variety of electrical equipment highly integrated touch one machine, so the use and maintenance should pay attention to some of the following questions:
A) before turning on the screen with a soft dry cloth;
2) water or beverage falls screen causes the software to stop the reaction, which is due to water droplets and the finger having similar characteristics, need to wipe the water droplets;
3) Touch screen controller can automatically determine the dust, but too much dust will reduce the sensitivity of the touch screen, Graphic LCD Display just use a dry cloth to wipe clean the screen;
4) application of glass cleaner dirty fingerprints on the touch screen and oil;
5) strict accordance with procedures and off the power, turn off the power in the reverse order;
6) generate a large number of temporary files on your hard drive, or if you frequently break off without exiting Windows directly, will soon lead to hard disk for errors. Therefore, the need to periodically run Scandisk scan the hard disk error, the application can set the password for the best way to exit the application and Windows re-power;
7) pure touch screen program does not require the mouse cursor, the cursor will only make the user can not concentrate;
8) should choose the most adequate application uses a simple anti-mouse mode, because of the complex model requires sacrifice latency and system resources;
9), as the deteriorating environmental conditions, periodically clean the touch screen to open the nose and the inner surface of the reflective stripes. Specific method is: Open the cover on both sides of the machine, you can find the front nose withhold release latch organs, open the body to release the latch. Lift the front of the nose, you can see the touch screen control card, unplug the touch screen cable, removable head to head back and touch screen. Look carefully at fixed touch screen method, remove the touch screen cleaning, be careful not to use cardboard or hard cloth, Character LCD Modules do not scratch the reflective stripes. Finally, in reverse order and the original structure will head recovery;
10) belong to man-machine interface touch-screen machine control engineering Copyright, fever than larger, it is necessary to take on the touch screen to cool the body and the surrounding environment measures.

Touch-screen technology used in industrial control application

I. Overview
Industrial touch screen, industrial display by touch even as one of the men and machines of the intelligent interface. It is an alternative to traditional control buttons and indicator lights intelligent operation display terminal. It can be used to set parameters, display data, monitor device status, to curves / animation and other forms depicting automation control process. More convenient, more expressive, and simplify the control program for the PLC, powerful touch screen to create a friendly interface. As a special touch screen computer peripherals, it is the most simple, convenient, a natural human-computer interaction. It gives the media a new look, is a very attractive new multimedia interactive devices.
Second, the principle of industrial touch screen
Touch screen system generally includes a touch screen controller (card) and touch detection device in two parts. Among them, the touch screen controller (card) The main role of the touch point detection device to receive touch information CONTROL ENGINEERING China Copyright, and convert it into contact coordinates, and then sent to CPU, it also can receive commands sent to the CPU and to be implemented: touch detection device is usually installed in front of the display, the main role is to detect the user's touch position and send it to the touch screen control card.
1 Touch Display Module
Resistive touch screen screen body part is a match with the display surface of the multi-layer composite film by a layer of glass or plexiglass as a grass surface is coated with a layer of transparent conductive layer control engineering Copyright, above and then covered with a layer of outer surface hardening treatment, smooth scratch-resistant plastic layer, an inner surface of which is coated with a transparent conductive layer between the two conductive layers are many small (less than one thousandth inch) of the transparent insulating isolation points separate them .
When a finger touches the screen, usually two conductive layers insulated from each other in touch with a contact point, because of which a conductive layer is connected to the Y-axis direction 5V uniform voltage field, making the detection of the voltage from zero to zero, this is detected by the controller on-state after the A / D conversion, and the voltage value obtained can be compared to 5V Y axis coordinates of the touch point, the coordinates of the same reason, the X-axis This resistive touch screen technology is that all the common basic principles. Resistive type touch screen technology is the key material. Lead resistance screen according to number of hours, divided into four or five lines, six lines, multi-wire resistive touch screen. Resistive touch screens in the glass surfaces were painted two OTI transparent conductive metal oxide layer, the outermost layer of OTI as a conductive coating, the second layer precision through OTI is attached to the network anyway in both directions of +5 V to 0V voltage field, OTI between two layers of transparent to small isolated point separated. When a finger touches the screen,OLED Module two conductive layer OTI will be a contact point, the computer detects the voltage and current simultaneously calculate the location of the touch, the reaction speed of 10-20ms.
Five-wire resistive touch screen of the outer conductive layer using good ductility nickel deposit coating materials, the outer conductive layer due to frequent touch, use good ductility nickel deposit materials in order to prolong life, but the technology costs more expensive. Nickel-gold conductive layer scalability is good, but only for transparent conductors, is not suitable as a resistive touch screen face, because it is high conductivity, and the metal is very difficult to achieve a uniform thickness, suitable for voltage distribution layer, only as a probe layer.
Resistive touch screen is a completely isolated from the outside of the work environment, not afraid of dust and water vapor, which can be used to touch any object that can be used to draw and write, more suitable for industrial control and office use. Resistive touch screen is a common drawback is that because the outer layer of the composite film with plastic material, people do not know or use too much force may scratch the whole touch sharp touch screen scrapped as a result. However, within limits,TFT LCD Module only scratch injured outside the conductive layer, the outer layer of conductive scratch for five-wire resistive touch screen is not related, while the four-wire resistive touch screen is fatal.
2 logic control and communication modules
Logic control module contains the 24V DC input (18-32) power, SDRAM memory and CF memory cards, 10/100BaseT Ethernet ports can be used for file transfer, printing and communication with the programmable controller 232 serial port that can be used to connect mouse, keyboard, or print meter USB port. Embedded in the circuit board inside the CPU chip, charge of the display input, output and processing of communication data. Communication module is responsible for a particular network transport, in order to improve the data transfer rate.

Narrow LCD project implemented several key points

55-inch Ultra Narrow LCD Video Wall LCD55, most Narrow LCD bilateral patchwork of only 5.3mm, LCD splicing hit a current listing of LCD splicing products patchwork narrowest record , but also the first time exceeded the LCD stitching patchwork 6mm or less, which also indicates that LCD display market will usher in another round of development climax.
A complete set of large-screen LCD splicing systems, in addition to the forefront of the screen , the will to involve computers, networks , video surveillance, integrated wiring and numerous peripherals and many other devices , these features also created a large-screen LCD splicing system install complex and difficult characteristics. In fact, in addition to these features , the large-screen display system for engineers not only have excellent engineers and technicians , but also have strong project management and operational capacity , only to have these features in order to respond flexibly to various installation projects .
LCD splicing project proposal : large-screen lcd graphic display splicing system project can be divided into four distinct phases , namely: project planning, preliminary survey , project implementation and post-project . Among these four stages , pre- survey and implementation of the project is very important, if these two stages in the implementation process problems, will seriously affect the progress of the projects and the quality of the projects . Before the implementation of the project -based investigation and implementation of two parts which need to pay attention to what ?
First, the LCD splicing preliminary engineering survey points: pre-construction survey in addition to the construction site in person to understand the investigation , they also need to conduct a detailed and customer communication , and make the overall construction project planning , as these largely determine project cycle length , cost control, and the presentation of the final results , it is necessary to pay special attention.
1, first : Install the equipment on the ground to be flat. Because the entire LCD large screen splicing system weight is very large especially rear stitching, its technology determines its cabinet is very large, and very heavy, so if the floor is ceramic tile installation of equipment , it must first confirm whether it can withstand such weight , Graphic LCD Module preferably fixed on another device antistatic floor on the ground, in order to ensure long-term ground by heavy deformation.
2 , followed by the wiring : LCD large screen splicing system wiring, power lines and signal lines to be separated in order to avoid unnecessary interference with the signal ; another large LCD screen according to the specifications , the cabinet position , the signal source location is calculated required for a variety of cable lengths , number of joints and the signal line names. But also confirm with the customer , project pipeline channel is available to meet the actual needs, in order to continue follow-up work .
3 , ambient light : Because LCD splicing screen brightness of the product is relatively limited, if the system's ambient light is too bright , the picture effect would have been affected . Under normal circumstances, required within 4 meters in front of the screen is dark , it is best not to install fluorescent tubes can be installed concealed downlights , light to shine directly on the screen can not and must have a separate switch. In addition to the installation of tube lights and large screen devices in parallel , try to make the work area has adequate lighting , but will not have a significant impact on the screen , the screen may be near the incoming light ( such as windows ) , if necessary, to be blocked while the device is running best to turn off the light , in order to ensure normal operation of equipment .
4, the framework requires : Considering the LCD splicing screen installation and ease of maintenance , the frame must be removable edging edging . Outside the framework of the fight away from the wall along the side ( up and down about four sides ) set aside about 25mm clearance on each side , a large video wall should be increased according to the number of columns margin . In addition , in order to post into the box maintenance, repair channel principle is not less than 1.2m wide. Removable side bar to hold the edge of the screen 3-5mm is appropriate, in the box and the screen is fully in place, and finally fixed removable trim.
5 , air-conditioning ( depending on the project may be ) : In the pit lane , the need to install air-conditioning or outlet, ensure that the ventilation equipment in good condition . Outlet should be located as far away from LCD Video Wall (1m or so good ) , and the outlet box directly facing the wind can not blow hot and cold in order to avoid uneven screen damage .