LCD splicing image processing apparatus

Commonly used video equipment including video splitter, video extenders, video matrix switcher , multi-screen video signal processors, video signal converter that several major equipment.
Video distributor, is mainly used to copy the source video output signal into multiple outputs ; major application type is a sub- sub 4,1 8,1 3,1 16 four specifications . RCA and BNC interfaces form is divided into two kinds.
Video Signal Extender is mainly used for video signal attenuation additions, indoor video signal transmission distance up to 100 meters, the need to configure signal amplifier, over 100 meters using signal extender ;
Video Matrix Switcher , mainly used for multi-channel video signal input and output channel switching , lcd module to achieve a number of entry for more options . Divided into RCA and BNC interfaces.
Multi-screen video signal processor , mainly for multi-channel input signal displayed on the screen at one occasion , common specifications for the 4-screen , six screens , 9 screens , 13 screens , 16 screens five formats .
Video signal converter main function is to convert the video signal output VGA signal into a computer .
Computer signal processing equipment mainly includes VGA signal splitter, VGA Extender , VGA matrix switcher or RGB matrix switcher.
VGA signal splitter is used to copy the output port of a computer into multiple VGA output , common specifications for 1 min 2,1 4,1 8,1 16 minutes of four.
VGA signal extenders, mainly for long distance transmission of computer signals with twisted pair and fiber optic transmission in two ways, using twisted pair within 200 meters and 200 meters above must be using optical fiber transmission.
VGA or RGB matrix switcher for computer signals are multiplexed input and output channel selection, an entry into the right for more or more , which could be exchanged . VGA Matrix Switcher VGA interface common to use a computer , RGB matrix switcher is a computer signal into red, green , blue, line frequency , field frequency of five independent channels , the transmission signal stability , distance farther than VGA , commonly 5BNC interface.
Multi-screen display controllers :
Mainly used for video , computer , network signal mixed display . Remote network access management , image display , it can display the entire screen , window display roaming , single-screen multi-screen display .
Multi-screen controller can access up to 32 channels of video input ( plus expansion chassis can access even more ) , OLED Display the conventional 4-way VGA input, 2-way network input and output cables you can use VGA or DVI, and the number of output channels same number of screens .
With DLP rear projection , PDP plasma wall with mosaic DID LCD splicing increasingly intense competition , the advantages of large-screen LCD is gradually being recognized more industries and areas , as most of the customer's choice .

In the coal industry the big screen display function then fight the system to achieve

Full-screen , high-resolution applications
As a unified whole wall can be a logical screen to display high-resolution image screen , full screen display and resolution overlay, such as ultra-high resolution display system diagram , words of welcome and so on OLED Display Module.
Multi-channel video signal display
Supports all standard video input signals , video surveillance information , cameras, video recorders , the size of DVD players, projectors and other types of physical color video signal source can access general multi -screen processor , the signal processed by the general picture , as a window anywhere in the projection display wall to zoom, move across the screen, and so on .
Network signal display
Through the network connection , the signal display more flexible and convenient, the image on a network computer anywhere on the big screen , quickly display any proportion ; various unlimited number of computer workstations , future expansion will be on the wall just a computer -linked display to the network can be.
RGB, the video signal through display
Through enlarged. This image processing card configuration display unit supports fully lossless display 1080p, 1080i, 720p , and other high-definition video signal formats , you can directly enter playback HDTV, EVD, HD-DVD, HD DVR , and other high -definition video signal. Í2, 2ÍN way ( ie 2Í adoption and use of a display unit configured Visionlink super signal processing board can be multi-channel RGB, video signals , in full-screen mode within a single screen or full screen display.
Mixed display various types of signal
Universal multi-screen processor capable of handling ultra-high resolution graphics computer network splicing signals,lcd module video signals and RGB signals and different types of cross-screen display signal superimposed display function, either way the signal window can be arbitrarily reduced, enlarged , cross-screen or full screen.

Large screen display system application in the coal industry

With the coal industry automation, information technology, the increasing level of technology , to enhance safe production management efficiency , improve production dispatching advanced and fast . It is necessary to set up an industrial video surveillance system. Through the production of major aspects of workplace surveillance , command and control personnel can direct observation to monitor the real-time production site for dispatch personnel to provide fast, dynamic , convenient and practical information, 240x128 lcd and provide some decision support. Is to improve the level of coal mine production scheduling important measures. But also improve the efficiency of an important guarantee for mine production .
Mine industrial video surveillance system consists of cameras , PTZ, PTZ decoder , video servers, transmission fiber , fiber optic transceivers , video surveillance server ( large screen display system ) and other components.
Through the mine surface and underground meeting rooms and places to set the main production processes with PTZ Color Camera , on the one hand , in the mine control room to monitor real-time on the screen ; hand, through the LAN exchange received video conference system television and telephone conference to achieve the shared screen . While the large screen display system can also mine safety monitoring system to monitor the graphic files and real-time data to be displayed.
Based on large-screen system consists DMDTM ( digital light processing systems ) technology projection unit ( including projection cubes , DLPTM projectors, professional rear projection display ) multi-screen control systems ( including multi-screen controller , video matrix switcher ) ,TFT Lcd Modules the monitor , the system control and related peripheral devices ( cabinet , base , cable etc.).

The role of audio and video matrix

In modern multimedia conference room , in order to meet the needs of different occasions demonstrated , usually with a variety of different audio and video sources and display terminal ,lcd graphic display modules although these audio and video sources and display terminal may also have composite video (Composite-Video) , S-video (S-Video), component video (Component-Video) or digital video (DVI, SDI) interface, but now in the multimedia video conferencing are still commonly used composite video matrix , the main reason in the following few areas:
· Composite video with good stability, compatibility and versatility , the transmission bandwidth is small , the transmission distance is long . But chrominance and luminance share 4.2MHz (NTSC) or 5.0 ~ 5.5MHz (PAL) frequency bandwidth between each other a relatively large crosstalk , equipment and transmission cable on the requirements of the standard is not high , the signal source rich , embedded cable lower investment .
· Super Video (S-Video) While in reducing loss of brightness , brightness / chroma crosstalk significantly better than composite video , but for now common LCD projectors , DLP projectors and reach a very significant difference, and embedded composite video cable is double the investment , so long-distance transmission projects not widely used.
· Component video signal format has been significantly higher than the level of the composite video or S-video , but mostly in the conference room for the computer display (VGA or RGBHV signal format ) services, equipment and transmission cable is demanding ( depending design standards and the expected investment budget ) , embedded cable investment is very high.
· Similarly Y, RY, BY, Y, Cr, Cb component video signals currently mainly used in the broadcasting industry , and will gradually SDI or HD-SDI digital signal format transition , due to the signal source and the capital budget constraints, meeting room using much. DVI signals due to the effective transmission distance ( 5 meters ) , and is currently not widely used .
Summing up the classification , mini lcd module it is customary audio and video matrix are not particularly specified default composite video format. Composite video output format to the main equipment: cameras, physical booth , cable modem, remote video conferencing , video tape recorders , DVD players , etc., audio and video matrix systems intermediary in the video source and the display terminal or reuse Rooms, responsible for different audio and video signal source according to the user's wishes for centralized control .

Four kinds of principles and techniques of contrast touch screen

Touch screen system generally consists of two parts : a touch detection devices and touch screen controller . Touch detection device is mounted in front of the monitor screen , for detecting a user touch position, a touch screen controller receiving evacuation ; touch screen controller 's main role is the touch point detecting means to receive touch information and convert it into contact coordinates , sending to the CPU, it also can receive commands sent to the CPU and executed .
With advances in technology , touch-screen technology also experienced a gradual upgrade from low to high and the development process. According to its working principle , its current is generally divided into four categories: resistive touch screen , capacitive touch screen , infrared touch screen and surface acoustic wave touch screen .
Resistive Touch Screen
Resistive touchscreen screen body part is a multi-layer composite film by a layer of glass or plexiglass as a grass surface is coated with a layer of transparent conductive layer (ITO film ) , above the outer surface and then covered with a layer of hardened , smooth scratch plastic layer . Its inner surface is also coated with a layer of ITO, a conductive layer between the two layers of many small ( less than one thousandth inch ) transparent isolation points separate them . When the finger touches the screen , the two ITO contact occurs , resistance changes , the controller detects a change in resistance to calculate the coordinates of the contact point , and then follow this coordinate to the corresponding operation . Lead resistance screen according to number of hours , divided into four or five lines and other types. Five-wire resistive touch screen is a conductive outer surface of the glass rather than the conductive coating layer, a longer life of this conductive glass , the transmittance is higher.
Resistive touch screen ITO-coated brittle fracture easily if too thin , thick coating will reduce internal reflection of light and the formation of reduced clarity. As has often been touched , use ITO surface after a certain time hairline cracks , and even variant, so its life did not last long .
Resistive touch screen is cheap and easy to produce , and thus it is still more common choice. Four -wire , five -wire and seven lines, eight -wire touch screen to make it appear more reliable , but also to improve its optical properties.
Capacitive touch screen
Capacitive touch screen are plated on the narrow sides of the electrode which is formed within a low-voltage AC electric field . Touch screen labeled with a transparent film layer , which is a special metal conductive materials . When the user touches the capacitive screen , the user's finger and face forming a capacitive coupling, because the work surface is connected with high-frequency signals , so fingers will suck a small current , respectively, from the current electrodes on the four corners of the screen in the outflow ; , and theoretically the current flowing through the four electrodes and the finger is proportional to the square of the distance from the controller through the four current ratio of precise calculation , the contact point can be derived .
Capacitive touch screen dual glass not only protect conductors and sensors , more effectively prevent external environmental factors affect the touch screen , even if the screen is stained filthy ,color lcd display module dust or grease, capacitive touch screen is still able to accurately calculate the touch location . However, since the capacitor with the temperature, humidity or changes in the different ground conditions , its stability is poor , often produce drift.
Although not so extensive application of resistive , capacitive touch screen is also popular for the election type. Such equipment precision , fast response, slightly larger size also has a higher resolution , more durable ( scratch resistant ) , and thus suitable for use as a touch screen consoles . Moreover , emerging near-field imaging technique improved performance capacitive touch screen , weakening it and the resistive touch screen drift may occur .
Infrared touch screen
Infrared touch screen arrangement of the four sides of the infrared emission control and infrared receiver tube , which correspond to the formation of horizontal and vertical cross- infrared matrix . When the user touches the screen , the finger will be blocked if they had been the location of two infrared controller can be judged by calculating the position of the touch point .
Infrared touch screen is also not current, voltage and electrostatic interference, suitable for certain harsh environments. Its main advantage is low cost, easy to install, can be used in various grades on the computer . In addition, since no capacitor charging and discharging process , the response speed faster than capacitive , but lower resolution .
Surface acoustic wave touch screen
A surface acoustic wave is an ultrasound , which is the medium (e.g., a rigid material such as glass or metal ) Surface Shallow mechanical energy wave propagation . By triangular wedge base ( designed strictly according to the wavelength of the surface wave ) , can be directed , a small surface acoustic wave energy emission angle . Surface acoustic performance, ease of analysis, and in the transverse transfer process has a very sharp frequency characteristics , in recent years, non-destructive testing, imaging and exit filter applications such as rapid development .
The four corners of the touch screen display has an ultrasonic transmitter transducer and the receiving transducer , and can send an ultrasonic cover the screen surface . When the fingers touch the display, due to absorption of some of the acoustic energy , the change in the received waveform , the waveform has an attenuation at a time gap, the controller can be calculated based on the signal attenuation of the touch point .
Surface acoustic wave touch screen independent of temperature, humidity and other environmental factors, high resolution , excellent scratch resistance , long life ( 50 million times without failure ) ,TFT LCD Displays high transmittance ( 92% ) , to maintain a clear translucent image ; does not drift , just installed a correction ; has a third axis ( ie pressure axis ) response , the most suitable for use in public places .
Surface acoustic wave touch screen susceptible to water droplets, dust, effects of improvement of the method is to add dust , dirt , or to increase the monitoring of the efficient operation accurately identify the difference between and dirt . In addition, the acoustic screen can feel the pressure , potentially increasing the means of control, on -screen feature is very beneficial expansion of its scope of application thus greatly expanded .

DLP LCD PDP three kinds of large-screen display technology principle explain

After ten years of development , large-screen systems have been widely used in various fields , but due to large-screen products have a certain degree of technical difficulty and high technology content, so far, there is still a large part of for the large-screen display users know little about the product , so the projection of the times network users should be required to popularize something about today's large-screen market, three major technical knowledge , because only by understanding this can we better understand the product.
From a technical type to points, then , large-screen products can be divided into the mouth , DLP rear projection display unit , Character LCD Module liquid crystal splicing unit and PDP plasma splicing unit three categories. With their advantages , these three technologies currently in the market competition is very close but in the end these three technologies is better, I believe after reading the following description , your mind will naturally clear.
Patchwork " and no one can " DLP rear projection display
DLP 's full name is "Digital Light Procession", Chinese meaning is digital light processing , which means that this technology through the digital video signal to be processed first , then put out the light projection . That specific point is , DLP projection technology applied to digital micromirror chip (DMD) as the key processing elements in order to achieve digital optical processing.
The principle is that through UHP lamp emits cold light through a condensing lens , the light through Rod homogenized , after treatment, the light passes through a color wheel will be divided into three RGB primary colors of light , color and then projected by the lens on the DMD chip , the last after a reflective projection lens image on the projection screen .
DLP rear projection display wall by a plurality of display units splicing , its main feature is a small patchwork , patchwork minimum it can reach tenths of a millimeter , can be truly "seamless " stitching, which is the other two technologies LCD and PDP can not match and the .
Of course, DLP splicing also has its drawbacks . As a light source DLP splicing is from the bulb , causing its power consumption, heat dissipation is high, but after a period of time there will be decrease in brightness , causing the user must constantly replace the lamp to maintain the initial display, and its unit box the body, the installation will cause some trouble , lcd module etc., to the user's inconvenience.
But with the splicing technology continues to evolve, the current DLP splicing has been resolved frequent replacement bulbs, power consumption, heat dissipation higher range of issues , which have benefited from the LED light source added . After using a LED light source DLP splicing unit , not only in life to get on a larger breakthrough, while in color with power and other aspects of revolutionary change , so DLP splicing remain market-leading advantage.

PDP plasma / DLP, LCD liquid crystal three technical features

PDP advantages:
Single screen evenness
Initial installation of high brightness
PDP Disadvantages:
Large gap pixels
Fatal flaw : lcd module computer images or static images easily burning
Brightness decay fast and can not be improved
Low reliability , high power consumption
DLP Advantages:
Digital display brightness decay slowly
Pixel gap is small, exquisite images
Display the computer for a long time and still images
High reliability , low power consumption
DLP Disadvantages:
Brighter than the plasma is low, but bright enough for a long time watching
LCD LCD advantages:
Low power consumption , light weight , long life ( generally work more than 50,000 hours ) , no radiation, such as screen brightness uniformity
LCD LCD Disadvantages:
Easy to put bigger size , can not do seamless
Conclusion
From advanced technology is , PDP due to the basic principles of imaging limitations , has been with the DLP and LCD development and cost reduction gradually phased out , for the newly created system , recommended to choose more technologically advanced OLED Display products