First, the main features and requirements <br> <br> large-screen display system design first proposed requirements, the following main functions and general requirements.
1. The information receiving system must not only receive VGA, RGB, network computer information, but also receive wideband voice and video signals, and can perform appropriate information conversion as needed.
2. The information display system can publish shared information in the form of multimedia, and can display situation, text, table and video image information in different modes according to the divided areas. The required situation is clear, the resolution is high, and the text and image display are clear and stable.
3. Preview, camera and switch To ensure the accuracy and quality of the projection display information, the system must have a preview function for pre-audit of the image. A video camera should be installed in the display hall to extract video images of the management control mechanism. The system should have a switch display function to meet the needs of multi-channel information display.
Second, the system layout 1. Basic layout The layout options available for the large screen display system are: cinema type, round table type, ladder classroom type, line type.
The large screen of the cinema-type layout is directly in front of the display hall, the leader is seated in the middle, and the salesperson is located in front of or on both sides of the leader. The technical support personnel are specially set in the control room after the leader, which is convenient for observing and controlling the large screen display. . Watching the seats in the back or outside, their visit or observation does not affect normal work. This layout makes each seat as the best viewing position of the large screen as much as possible, which is conducive to expanding the seats. It can accommodate more people and is suitable for decentralized management system. Therefore, the screen size can be larger and more than one piece. In front of. But this layout is not conducive to conversations between leaders and other members.
The round table layout can be set up with three screens. The main screen is located at one end of the round table, and the auxiliary screen is located on both sides of the main screen. The angle between the screens depends on the number of people. The leader is at the other end of the round table and is in the best viewing position. The salesman or assistant decision-making leader is located on both sides of the round table, mainly watching the screen on the front of the seat. This kind of structure is good for leaders to watch the big screen and discuss with other members, but it is not conducive to assist decision-making leaders to watch other screens, and needs to make up for the solution by properly dividing the display area and content.
The large screen of the ladder classroom layout is located in front of each other. The various personnel are arranged in a stepped manner according to the importance of normal work. The main decision-making leaders are in the best large-screen viewing position, and the rest are second. Between the seats and the screen, a speaking platform is placed for the speaker. This layout is suitable for management organizations that have more leaders and observers and rely solely on the information provided by the large screen to make decisions.
The large screen of the line layout is linear or curved. The large screen is divided into several areas according to the department, direction or task. The relevant leaders are in the best viewing position of the corresponding area and exercise management functions independently of each other. In this layout, the large screen on the front of each decision maker or group of decision makers is specifically set up to display the most concerned information, and is suitable for management control agencies that focus on flat and decentralized decision making.
2. Layout of projection display device Projection display device includes projector, controller, source machine, information receiving and format conversion equipment. These devices are large in number and volume, and have close physical connection. The basic requirements of layout are concealed, reliable and convenient. Operation and maintenance.
The projection is divided into front projection and rear projection. The light of the front projection passes through the display hall and projects the information onto the screen. The orthographic projection obtains a large orthographic projection plane by increasing the range of the light, and is suitable for a single screen single machine and a large screen size requirement, thereby reducing equipment and reducing cost, but the height of the orthographic projection on the object in the hall is displayed. There is a limit, and the intensity of the light will be attenuated as the projection distance is extended, so that the brightness of the screen is lowered. It is common to use two projectors to superimpose or reduce the brightness of the hall illumination to improve the relative brightness of the projection display.
Rear projection is generally used in a short-range environment. In order to improve the format of the projection display, a wide-angle lens or a multi-projector can be used. The performance of the lens is usually expressed as the ratio of the range to the screen width. The range can be selected from 0.88:1 to 7:1. The wide-angle lens can obtain a larger display size with a shorter range. However, compared with splicing with multiple projectors, in order to achieve the same brightness, the projector with a wide-angle lens requires a larger power source, and the larger the screen, the more pronounced the solar effect. Therefore, for a screen with a large single screen, a splicing structure tends to be adopted. The splicing projector is fixed on the special frame behind the scene, and the controller, source machine, information receiving and format conversion equipment are located at the rear of the screen or under the frame of the first layer projector so as not to affect the conditions of normal projection display. Perform maintenance operations.
3. Display control room equipment and layout display control room is usually located behind the display hall, separated from the hall by one-way glass, and there is a sound hole on the glass, so that technical support personnel can directly observe and hear the personnel in the display hall. Equipment status, in order to timely discover and respond to user complaints, timely technical support and troubleshooting.
The display control room should include: preview monitoring equipment, large-screen operation control equipment, source selection equipment, audio control equipment, multimedia playback equipment, audio recording equipment, lighting control equipment, and the like. Through the monitor wall, the technical support personnel can grasp the situation of the projection display, preview the image displayed by the projection, and display the large screen by using various tools such as wired, wireless, infrared, remote control, touch screen, keyboard and mouse on the display console. The system performs operation control, completes display, switching, and preview control of computer information and various video information that needs to be projected, and can simultaneously control the lighting, sound, curtains, and video of the display hall by using a centralized controller.
4. Layout of the monitoring mat The monitoring mat is usually located in the front row of the display hall. It is equipped with most control equipment and simplified monitoring and previewing equipment. It has most of the control means and control functions of the display control room, which is convenient for operation control on site. Handle user claims and troubleshooting.
Third, equipment selection <br> <br> large-screen display system equipment selection according to the actual use of the environment and the need to determine product performance requirements and key technical indicators, and then select a wide range of products based on the project budgets and main technical parameters and functions Contrast, refer to relevant literature and other user experience, focus on brand and after-sales service, focus on selecting several products, through actual testing, bidding when necessary, and finally selecting the required products. There are dozens of large-screen display devices. The following only describes the most important choices of projectors, screens, and controllers.
1. Projector projectors have many indicators, which can be compared in terms of display performance, reliability and maintainability. Display performance mainly includes brightness, resolution, and contrast. The brightness of the projector ranges from hundreds to tens of thousands of ANSI lumens. The actual brightness of the screen before viewing is related to the projection distance, screen and ambient brightness. This should be comprehensively selected according to the situation. In the large-screen display system, it tends to use the DLP projector of 4000 ANSI lumens for splicing. Contrast is the brightest and darkest ratio of the projector output, 800:1 can meet the requirements.
Reliability is usually expressed in MTTF (mean time between failures), of course, the longer the better. However, almost all products have weak links. The weakest part of the projector is the light source. Because it can't be displayed even in the case of centralized management or important tasks, even a short screen can't be displayed. According to the barrel theory, the life of the lamp is an important factor affecting the projector MTTF, generally in the thousands of hours. Maintainability is usually expressed in MTTR (Fault Repair Time). In order to shorten the time to repair faults, high-end projectors use independent lamp unit components or dual-lamp backup. There is no need to move the projector or geometric correction to improve replacement. speed.
2. Screen selection:
The projection screen can be functionally divided into transmissive and reflective, transmissive for rear projection, and reflective for front projection. From the material can be divided into pearl curtain, glass curtain, metal curtain, near white curtain, embossed plastic curtain and so on. The correct selection of the projection screen and the proper matching with the projector can achieve high-quality projection effects, generally selected according to the type, material and size steps.
Gain and viewing angle are the two main indicators of the projection screen. The gain reflects the ability of the screen to reflect incident light. When the angle of the incident light is constant and the incident light flux is constant, the ratio of the brightness in one direction of the screen to the brightness in the ideal state is called the brightness coefficient in that direction, and the maximum value is called the gain of the screen, usually The matte white wall has a gain of 1 and a gain of up to 3.5 in the light-reflecting focus of the embossed plastic screen. In general, the higher the gain, the smaller the viewing angle, and the viewing angle will affect the placement and number of seats. The reflection of the screen in different directions is different. The farther away from the center of the screen, the lower the brightness, which is also called the solar effect. When the brightness is reduced to 50%, the viewing angle is defined as the angle of view. The Fresnel optical wide-angle rear projection screen The horizontal viewing angle can be made 170 degrees.
The size of the screen should be coordinated with the spatial layout of the display hall, seat settings, and human physics needs. Display the height of the space in the hall, usually 5~7 meters. There should be a leadership seat, a salesperson's seat, an operation control seat, a simultaneous translation seat, a technical monitoring seat, a relevant department management seat set up for coordination work, and reserve observation or The location of the visitors. Each seat area varies according to the equipment configuration, and 6~8 square meters can meet most needs. The maximum distance between management and business staff is appropriate for direct dialogue without delay, and should not exceed 30 meters. The bottom edge of the screen should be 0.8~1.2 meters from the ground. The single screen should generally conform to the aspect ratio of 6:4 or 16:9. The height of the screen is approximately equal to 1/6 of the distance from the last row of viewers to the screen. The distance from the seat to the screen should be greater than 2 times the height of the screen. The above data can be used as a reference for the selection screen, and the specific size should be determined according to the actual situation.
3. Controller selection â—† Matrix switcher The matrix switcher is used to switch any input RGB or video signal to any output path and directly to the projector for display. The hard splicing relies on the projector's own functions to achieve splicing, the imaging speed is fast, and the matrix switcher signal switching speed is also fast. Therefore, the hard splicing is suitable for occasions where the display mode needs to be frequently switched. The number of channels of the input signal of the matrix controller should be determined according to the number of signal sources, and the number of channels of the output signal should be no less than the number of projectors. Generally, the matrix switcher has two kinds of switching modes: the control panel and the RS-232 serial port command. Therefore, whether the product can provide the communication protocol command code is very important, which involves whether the matrix switcher can realize the computer control problem. The analog signal bandwidth should be more than 300m to ensure image transmission quality. The input impedance should be matched with the signal source to make the image display stable. These parameters sometimes need to be confirmed by debugging. The matrix switcher produced by Guangzhou New Special is a good choice.
â—† Large-screen splicing processor At present, there are three types of splicing control systems in the world: hardware splicing system, software splicing system, software and hardware splicing system, multi-channel video, RGB input and output interface, and more The external video and RGB analog signals are digitized, imaged in the imaging device, and then converted into analog signals for output to the large screen, and can be freely moved, enlarged and reduced on the large screen to achieve seamless mosaic of any size across the screen and multiple windows. As flexible and convenient to operate in a large window, this process is also called soft stitching, and the display wall controller is also called a soft stitch controller.
The display wall controller provides flexible splicing and operation options for large-screen graphic display. It is an ideal choice for occasions where there are not many windows (4-6) and only change the display content and change the stitching mode less. Due to the change of the splicing mode, the controller needs to perform conversion and calculation operations on each window. It is necessary to re-synchronize the projector, occupying a large system resource and processing time, so that the switching time is long, and some are as long as 1 minute. In applications with high output resolution, multiple open windows, and frequent switching, the switching time and window opening time will be longer, and the video display will be animated. In a large management center, the number of signal sources greatly exceeds the number of openable windows. It is often necessary to change the display mode and switch modes. Therefore, you should select a more powerful controller. According to the general feeling, the number of windows should not exceed 10. Therefore, soft stitching is suitable for occasions where the signal source switching is small. The embedded image splicing controller adopts embedded structure design, with the control chip as the core and pure hardware controller; it can work continuously for 24 hours; compared with the board-type controller, there is no problem of crash, virus, etc., and the stability is better. It can accept analog video signals in high-resolution RGB, VGA, composite video and video formats and high-resolution DVI digital signals, and adjust and change the window size, display position and image ratio of the input window according to user requirements. Finally, in the form of multi-window, displayed on the splicing display unit, each RGB channel is independently calculated, and the signal processing is more detailed; RGB and video images can be superimposed on each other; video signal processing has motion compensation, which can eliminate the jagged of moving images. Phenomenon; better image processing quality than board controller;
â—† Central Control System The large-screen display system is a complex system that integrates multiple media devices. It is a good choice for centralized control in the leadership staff, display control room, and monitoring seats. The central control system is actually a middleware that controls a variety of media devices, equipped with computer hardware and a dedicated operating system, with the ability to upload standard computer programs, upload touch screen engineering programs, update operating systems, and write control programs. For the selection of the centralized controller, the control object and control properties should be clearly defined first. In the large-screen display system, it is generally necessary to switch control of RGB, video, and audio signals, switch control of lights, curtains, video cameras, and power supplies, and play control on DVDs, VCDs, and decks, and accordingly select RSs. -232 protocol program control, relay switch control, centralized controller for infrared output interface. Secondly, the control terminal should be selected. Usually, the wired and wireless touch screens are selected as the control terminals, and accordingly, the centralized controller is required to have an input interface for receiving RS-232 commands and radio signals. The AV3+/AV3M+ programmable central control system produced by Guangzhou Xintewei should not only have a large number of standard equipment control code databases, but also prepare for equipment expansion. It should also be an intelligent learning device that can easily learn the control of remote control equipment. Command to supplement the lack of database.
Fourth, the comprehensive integration <br> <br> comprehensive collection of information available in the configuration of the selected products, basic installation and testing methods, combined with the actual use background rendering system block diagrams, equipment layout drawings, equipment vertical layout diagram, cable The technical data such as the connection diagram, machining diagram, and signal name comparison table are fully negotiated with the competent department of the business and the user unit to determine the final design.
Large-screen display system design needs to interconnect different products and different devices, and pursues the overall performance of the system as the best, rather than research and development of specific product equipment. The technical difficulty is the interface, and the technical difficulty is system coordination and optimization. When a system is built according to the design scheme, there may be many unexpected problems, such as signal matching problem, switching speed problem, some problems need to be adjusted, some need to replace the product, some even reduce the system index. The solution is solved.
The design process of the large-screen display system is actually a system integration process, which is to select a variety of technologies and products according to the needs of various industries, and to optimally configure various software and hardware product resources to form a complete An integrated solution that meets the specific application needs of each seat of the management organization.
1. The information receiving system must not only receive VGA, RGB, network computer information, but also receive wideband voice and video signals, and can perform appropriate information conversion as needed.
2. The information display system can publish shared information in the form of multimedia, and can display situation, text, table and video image information in different modes according to the divided areas. The required situation is clear, the resolution is high, and the text and image display are clear and stable.
3. Preview, camera and switch To ensure the accuracy and quality of the projection display information, the system must have a preview function for pre-audit of the image. A video camera should be installed in the display hall to extract video images of the management control mechanism. The system should have a switch display function to meet the needs of multi-channel information display.
Second, the system layout 1. Basic layout The layout options available for the large screen display system are: cinema type, round table type, ladder classroom type, line type.
The large screen of the cinema-type layout is directly in front of the display hall, the leader is seated in the middle, and the salesperson is located in front of or on both sides of the leader. The technical support personnel are specially set in the control room after the leader, which is convenient for observing and controlling the large screen display. . Watching the seats in the back or outside, their visit or observation does not affect normal work. This layout makes each seat as the best viewing position of the large screen as much as possible, which is conducive to expanding the seats. It can accommodate more people and is suitable for decentralized management system. Therefore, the screen size can be larger and more than one piece. In front of. But this layout is not conducive to conversations between leaders and other members.
The round table layout can be set up with three screens. The main screen is located at one end of the round table, and the auxiliary screen is located on both sides of the main screen. The angle between the screens depends on the number of people. The leader is at the other end of the round table and is in the best viewing position. The salesman or assistant decision-making leader is located on both sides of the round table, mainly watching the screen on the front of the seat. This kind of structure is good for leaders to watch the big screen and discuss with other members, but it is not conducive to assist decision-making leaders to watch other screens, and needs to make up for the solution by properly dividing the display area and content.
The large screen of the ladder classroom layout is located in front of each other. The various personnel are arranged in a stepped manner according to the importance of normal work. The main decision-making leaders are in the best large-screen viewing position, and the rest are second. Between the seats and the screen, a speaking platform is placed for the speaker. This layout is suitable for management organizations that have more leaders and observers and rely solely on the information provided by the large screen to make decisions.
The large screen of the line layout is linear or curved. The large screen is divided into several areas according to the department, direction or task. The relevant leaders are in the best viewing position of the corresponding area and exercise management functions independently of each other. In this layout, the large screen on the front of each decision maker or group of decision makers is specifically set up to display the most concerned information, and is suitable for management control agencies that focus on flat and decentralized decision making.
2. Layout of projection display device Projection display device includes projector, controller, source machine, information receiving and format conversion equipment. These devices are large in number and volume, and have close physical connection. The basic requirements of layout are concealed, reliable and convenient. Operation and maintenance.
The projection is divided into front projection and rear projection. The light of the front projection passes through the display hall and projects the information onto the screen. The orthographic projection obtains a large orthographic projection plane by increasing the range of the light, and is suitable for a single screen single machine and a large screen size requirement, thereby reducing equipment and reducing cost, but the height of the orthographic projection on the object in the hall is displayed. There is a limit, and the intensity of the light will be attenuated as the projection distance is extended, so that the brightness of the screen is lowered. It is common to use two projectors to superimpose or reduce the brightness of the hall illumination to improve the relative brightness of the projection display.
Rear projection is generally used in a short-range environment. In order to improve the format of the projection display, a wide-angle lens or a multi-projector can be used. The performance of the lens is usually expressed as the ratio of the range to the screen width. The range can be selected from 0.88:1 to 7:1. The wide-angle lens can obtain a larger display size with a shorter range. However, compared with splicing with multiple projectors, in order to achieve the same brightness, the projector with a wide-angle lens requires a larger power source, and the larger the screen, the more pronounced the solar effect. Therefore, for a screen with a large single screen, a splicing structure tends to be adopted. The splicing projector is fixed on the special frame behind the scene, and the controller, source machine, information receiving and format conversion equipment are located at the rear of the screen or under the frame of the first layer projector so as not to affect the conditions of normal projection display. Perform maintenance operations.
3. Display control room equipment and layout display control room is usually located behind the display hall, separated from the hall by one-way glass, and there is a sound hole on the glass, so that technical support personnel can directly observe and hear the personnel in the display hall. Equipment status, in order to timely discover and respond to user complaints, timely technical support and troubleshooting.
The display control room should include: preview monitoring equipment, large-screen operation control equipment, source selection equipment, audio control equipment, multimedia playback equipment, audio recording equipment, lighting control equipment, and the like. Through the monitor wall, the technical support personnel can grasp the situation of the projection display, preview the image displayed by the projection, and display the large screen by using various tools such as wired, wireless, infrared, remote control, touch screen, keyboard and mouse on the display console. The system performs operation control, completes display, switching, and preview control of computer information and various video information that needs to be projected, and can simultaneously control the lighting, sound, curtains, and video of the display hall by using a centralized controller.
4. Layout of the monitoring mat The monitoring mat is usually located in the front row of the display hall. It is equipped with most control equipment and simplified monitoring and previewing equipment. It has most of the control means and control functions of the display control room, which is convenient for operation control on site. Handle user claims and troubleshooting.
Third, equipment selection <br> <br> large-screen display system equipment selection according to the actual use of the environment and the need to determine product performance requirements and key technical indicators, and then select a wide range of products based on the project budgets and main technical parameters and functions Contrast, refer to relevant literature and other user experience, focus on brand and after-sales service, focus on selecting several products, through actual testing, bidding when necessary, and finally selecting the required products. There are dozens of large-screen display devices. The following only describes the most important choices of projectors, screens, and controllers.
1. Projector projectors have many indicators, which can be compared in terms of display performance, reliability and maintainability. Display performance mainly includes brightness, resolution, and contrast. The brightness of the projector ranges from hundreds to tens of thousands of ANSI lumens. The actual brightness of the screen before viewing is related to the projection distance, screen and ambient brightness. This should be comprehensively selected according to the situation. In the large-screen display system, it tends to use the DLP projector of 4000 ANSI lumens for splicing. Contrast is the brightest and darkest ratio of the projector output, 800:1 can meet the requirements.
Reliability is usually expressed in MTTF (mean time between failures), of course, the longer the better. However, almost all products have weak links. The weakest part of the projector is the light source. Because it can't be displayed even in the case of centralized management or important tasks, even a short screen can't be displayed. According to the barrel theory, the life of the lamp is an important factor affecting the projector MTTF, generally in the thousands of hours. Maintainability is usually expressed in MTTR (Fault Repair Time). In order to shorten the time to repair faults, high-end projectors use independent lamp unit components or dual-lamp backup. There is no need to move the projector or geometric correction to improve replacement. speed.
2. Screen selection:
The projection screen can be functionally divided into transmissive and reflective, transmissive for rear projection, and reflective for front projection. From the material can be divided into pearl curtain, glass curtain, metal curtain, near white curtain, embossed plastic curtain and so on. The correct selection of the projection screen and the proper matching with the projector can achieve high-quality projection effects, generally selected according to the type, material and size steps.
Gain and viewing angle are the two main indicators of the projection screen. The gain reflects the ability of the screen to reflect incident light. When the angle of the incident light is constant and the incident light flux is constant, the ratio of the brightness in one direction of the screen to the brightness in the ideal state is called the brightness coefficient in that direction, and the maximum value is called the gain of the screen, usually The matte white wall has a gain of 1 and a gain of up to 3.5 in the light-reflecting focus of the embossed plastic screen. In general, the higher the gain, the smaller the viewing angle, and the viewing angle will affect the placement and number of seats. The reflection of the screen in different directions is different. The farther away from the center of the screen, the lower the brightness, which is also called the solar effect. When the brightness is reduced to 50%, the viewing angle is defined as the angle of view. The Fresnel optical wide-angle rear projection screen The horizontal viewing angle can be made 170 degrees.
The size of the screen should be coordinated with the spatial layout of the display hall, seat settings, and human physics needs. Display the height of the space in the hall, usually 5~7 meters. There should be a leadership seat, a salesperson's seat, an operation control seat, a simultaneous translation seat, a technical monitoring seat, a relevant department management seat set up for coordination work, and reserve observation or The location of the visitors. Each seat area varies according to the equipment configuration, and 6~8 square meters can meet most needs. The maximum distance between management and business staff is appropriate for direct dialogue without delay, and should not exceed 30 meters. The bottom edge of the screen should be 0.8~1.2 meters from the ground. The single screen should generally conform to the aspect ratio of 6:4 or 16:9. The height of the screen is approximately equal to 1/6 of the distance from the last row of viewers to the screen. The distance from the seat to the screen should be greater than 2 times the height of the screen. The above data can be used as a reference for the selection screen, and the specific size should be determined according to the actual situation.
3. Controller selection â—† Matrix switcher The matrix switcher is used to switch any input RGB or video signal to any output path and directly to the projector for display. The hard splicing relies on the projector's own functions to achieve splicing, the imaging speed is fast, and the matrix switcher signal switching speed is also fast. Therefore, the hard splicing is suitable for occasions where the display mode needs to be frequently switched. The number of channels of the input signal of the matrix controller should be determined according to the number of signal sources, and the number of channels of the output signal should be no less than the number of projectors. Generally, the matrix switcher has two kinds of switching modes: the control panel and the RS-232 serial port command. Therefore, whether the product can provide the communication protocol command code is very important, which involves whether the matrix switcher can realize the computer control problem. The analog signal bandwidth should be more than 300m to ensure image transmission quality. The input impedance should be matched with the signal source to make the image display stable. These parameters sometimes need to be confirmed by debugging. The matrix switcher produced by Guangzhou New Special is a good choice.
â—† Large-screen splicing processor At present, there are three types of splicing control systems in the world: hardware splicing system, software splicing system, software and hardware splicing system, multi-channel video, RGB input and output interface, and more The external video and RGB analog signals are digitized, imaged in the imaging device, and then converted into analog signals for output to the large screen, and can be freely moved, enlarged and reduced on the large screen to achieve seamless mosaic of any size across the screen and multiple windows. As flexible and convenient to operate in a large window, this process is also called soft stitching, and the display wall controller is also called a soft stitch controller.
The display wall controller provides flexible splicing and operation options for large-screen graphic display. It is an ideal choice for occasions where there are not many windows (4-6) and only change the display content and change the stitching mode less. Due to the change of the splicing mode, the controller needs to perform conversion and calculation operations on each window. It is necessary to re-synchronize the projector, occupying a large system resource and processing time, so that the switching time is long, and some are as long as 1 minute. In applications with high output resolution, multiple open windows, and frequent switching, the switching time and window opening time will be longer, and the video display will be animated. In a large management center, the number of signal sources greatly exceeds the number of openable windows. It is often necessary to change the display mode and switch modes. Therefore, you should select a more powerful controller. According to the general feeling, the number of windows should not exceed 10. Therefore, soft stitching is suitable for occasions where the signal source switching is small. The embedded image splicing controller adopts embedded structure design, with the control chip as the core and pure hardware controller; it can work continuously for 24 hours; compared with the board-type controller, there is no problem of crash, virus, etc., and the stability is better. It can accept analog video signals in high-resolution RGB, VGA, composite video and video formats and high-resolution DVI digital signals, and adjust and change the window size, display position and image ratio of the input window according to user requirements. Finally, in the form of multi-window, displayed on the splicing display unit, each RGB channel is independently calculated, and the signal processing is more detailed; RGB and video images can be superimposed on each other; video signal processing has motion compensation, which can eliminate the jagged of moving images. Phenomenon; better image processing quality than board controller;
â—† Central Control System The large-screen display system is a complex system that integrates multiple media devices. It is a good choice for centralized control in the leadership staff, display control room, and monitoring seats. The central control system is actually a middleware that controls a variety of media devices, equipped with computer hardware and a dedicated operating system, with the ability to upload standard computer programs, upload touch screen engineering programs, update operating systems, and write control programs. For the selection of the centralized controller, the control object and control properties should be clearly defined first. In the large-screen display system, it is generally necessary to switch control of RGB, video, and audio signals, switch control of lights, curtains, video cameras, and power supplies, and play control on DVDs, VCDs, and decks, and accordingly select RSs. -232 protocol program control, relay switch control, centralized controller for infrared output interface. Secondly, the control terminal should be selected. Usually, the wired and wireless touch screens are selected as the control terminals, and accordingly, the centralized controller is required to have an input interface for receiving RS-232 commands and radio signals. The AV3+/AV3M+ programmable central control system produced by Guangzhou Xintewei should not only have a large number of standard equipment control code databases, but also prepare for equipment expansion. It should also be an intelligent learning device that can easily learn the control of remote control equipment. Command to supplement the lack of database.
Fourth, the comprehensive integration <br> <br> comprehensive collection of information available in the configuration of the selected products, basic installation and testing methods, combined with the actual use background rendering system block diagrams, equipment layout drawings, equipment vertical layout diagram, cable The technical data such as the connection diagram, machining diagram, and signal name comparison table are fully negotiated with the competent department of the business and the user unit to determine the final design.
Large-screen display system design needs to interconnect different products and different devices, and pursues the overall performance of the system as the best, rather than research and development of specific product equipment. The technical difficulty is the interface, and the technical difficulty is system coordination and optimization. When a system is built according to the design scheme, there may be many unexpected problems, such as signal matching problem, switching speed problem, some problems need to be adjusted, some need to replace the product, some even reduce the system index. The solution is solved.
The design process of the large-screen display system is actually a system integration process, which is to select a variety of technologies and products according to the needs of various industries, and to optimally configure various software and hardware product resources to form a complete An integrated solution that meets the specific application needs of each seat of the management organization.
Also known as electronic chemical materials. Generally refers to the electronics industry uses specialized chemicals and chemical materials, that is, electronic components, printed circuit boards, industrial and consumer production and packaging of various chemicals and materials. It can be divided into substrates, photoresists, electroplating chemicals, packaging materials, high purity reagents, specialty gases, solvents, pre-cleaning dopants, flux masks, acids and etchants, electronic adhesives and auxiliary materials Other categories. Electronic Chemicals with many varieties, high quality requirements, small dosage, demanding on the cleanliness of the environment, product replacement fast, large capital investment, higher value-added products, etc., these characteristics with the development of micro-processing technology more and more obvious.
Electronic chemicals, also referred to as electronic chemical materials, refer to the fine chemical materials that are used in the electronics industry. The electronic chemicals are a kind of special chemicals. As far as the properties of the production process are concerned, they belong to the fine chemical industry. In terms of product use, Belongs to the electronic material industry. According to the classification standard of China's national economy, the electronic chemicals industry belongs to "Specialized Chemical Products Manufacturing Industry" (2662); according to the "Guidelines for Industry Classification of Listed Companies" promulgated by China Securities Regulatory Commission in April 2001, it belongs to "Specialized Chemical Products Manufacturing Industry" C4360 ). They include integrated circuits and discrete device chemistries, such as chip production photoresist, ultra-clean high-purity reagents, ultra-clean high purity gas, plastic packaging materials; color TV with chemical materials, such as color phosphor, CPT Supporting the water-soluble resist, high-purity inorganic salts, organic films, etc .; chemical materials used in printed circuit boards, such as dry film resist, ink, chemical and electroplating copper plating solution and its additives, surface mount process conductive paste , Cleaning agents, liquid solder resist photoresist, adhesive patch, conductive adhesive, solder paste, pre-coated flux, clean and water-based process flux; liquid crystal display devices with chemical materials, such as liquid crystal, photoresist , Oriented films, adhesives, slurries, electrolytes, films and encapsulants, polarizers, etc .; polishing materials, ect.
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