Abstract: In this paper, aiming at the requirement of intelligent configuration in the process of installation and debugging of led display project, a kind of intelligent configuration method is proposed. The OE polarity of the display screen is realized by the wizard, user selection state and automatic judgment. Performance, scanning, color, highlight order, line order and other core parameters of the intelligent configuration to help users quickly configure, light up the display, while reducing the installation threshold of the display, the professional and technical personnel from the installation of the liberation of the project.
Introduction
In recent years with the rapid development of LED industry, display models, specifications are many, flourishing, allowing users to have more choices, but also to LED display display more colorful. But too many models, specifications in engineering applications and bring some problems, because many manufacturers and no uniform standards, resulting in LED display installation and commissioning has become a very heavy work. In addition, the installation of debugging involving more than 20 parameters, demanding, generally only professional and technical personnel to complete. In fact, most of the installation and commissioning are repetitive work, so that many professional and technical personnel into the project site commissioning, resulting in a great waste of manpower. Therefore, it was suggested that the early commissioning and the formation of data files, professional and technical personnel without the need to the scene, the general staff to download the site can be completed debugging, so LED intelligent configuration technology came into being. After market research, some LED control software also realized the intelligent configuration function, but the effect is not ideal, such as the steps too much, not intuitive, complex and so on. Based on this, after research, this paper presents a smart configuration method, allowing users to only "next step" approach to choose, at least only seven steps to automatically complete the intelligent configuration, debugging success, generate data files for storage And download use.
1 main functional requirements analysis and model construction
Because of the different manufacturers, the number of parameters of the display screen is also different, but basically each display has 20 items, after analysis and classification, can be divided into core parameters, basic parameters and auxiliary parameters of three.
For the basic parameters and auxiliary parameters of the configuration, provide input box and select box, user input and selection, connect the display can be set directly. For the core parameters, you can use the professional quick check, intelligent configuration and external file configuration three ways to complete.
(1) the core parameters
The core parameters are required for the display parameters, if the settings are not correct, the light is not displayed, while the burning screen. The core parameters include cascading direction, OE polarity, data polarity, display type, color, scanning mode, walking order and row order.
(2) the basic parameters
The basic parameters are the basic parameters of the display, if the settings are not correct, you can not communicate, do not show or display is not normal. The basic parameters include display width, display height, control card address, baud rate, IP address, port number, MAC address, subnet mask, gateway, display refresh rate, shift clock frequency, and line blanking time. 12 items.
(3) auxiliary parameters
Auxiliary parameters are designed to better display and control the parameters set, including the control card name, communication display mark, brightness, switch screen time a total of 4 items.
In summary, a display screen need to correctly configure two parameters to light up, its cumbersome, complex degree can be imagined, and if the settings are not correct, the light is not displayed, while the burned the display, resulting in significant economic Loss and duration delay. This is because the general display prices are more than 1,000 yuan, and some even more than one million yuan, therefore, some LED control software for the sake of prudence, stability, design complexity, the use of inconvenient is understandable. In order to overcome the shortcomings of existing software, reduce the use of the threshold, so that the display hardware debugging in the process of easy and natural to complete, after research, this paper constructs a complete display parameter configuration model and intelligent configuration model.
(1) professional quick check
For common and commonly used models of the display, the parameters are generally fixed, then can be pre-organized into a file or table, debugging, select the load configuration can be.
(2) intelligent configuration
For a display that is not common or can not be determined, its parameters are unknown. In this case, the smart configuration can be used to determine its configuration parameters and then save it for later use.
(3) external file configuration
Import smart files or other forms of external files into the configuration.
In the core configuration of the three configuration methods, intelligent configuration is the focus of this article, its main processes and functions are as follows:
(1) start intelligent configuration;
(2) through the wizard, allowing users and the display of human-computer interaction selection, start intelligent configuration operation, by filling out the initial parameters, determine the OE polarity / data polarity, determine the color, determine the scan mode, determine the order of walking, Sequence, generate configuration parameters and other steps to complete the determination of the core parameters;
(3) return intelligent configuration parameters;
(4) to connect the display, set the parameters;
(5) if correct, then the output parameter operation;
(6) select the external file, save, for future use. At this point, complete the display smart configuration.
Design and implementation of key functions
2.1 Fill in the initial parameters
The entire intelligent setup process is for the display module to operate, for the display, exactly that is observed from the signal cascade into the first display module. That is, if the signal cascade direction is from left to right, the first display module refers to the display module in the upper left corner of the display, if the signal cascade direction is from right to left, the first display module is the upper right corner of the display That display module. In order to facilitate the observation, the general intelligent settings only take a display module to set, and confirm the display module is good and faulty (including no abnormal lines or points).
After selecting the display module, fill in the signal cascade direction, module width point, module height point, display type and other parameters, you can click "Next" to start intelligent configuration.
2.2 Determine OE polarity and data polarity
OE polarity and data polarity are extremely important parameters of the display, where the OE polarity determines whether the display is on and the data polarity determines whether the display is correct. If the OE polarity is not correct, the display will not be lit, no matter what the polarity of the data; and the data polarity is not correct, the display is not normal, for the full light. Therefore, the primary task of intelligent configuration is to determine the OE polarity and data polarity. The display module shows three options: "Full Brightness", "All Black / Dark Bright", "Other Display or No Change". If you select "Other Display or No Variation", the hardware configuration is faulty and needs to be corrected. Hardware configuration and then intelligent configuration. In the specific design, to 0 for the high level, 1 on behalf of the low level, by sending high, low, and the user selected light or not to determine the OE polarity and data polarity, so OE polarity And the data polarity has four combinations. Therefore, the correct judgment OE polarity and data polarity up to only need four steps, as long as the rotation to send the corresponding OE polarity and data polarity value, and then record each step of the user's choice, you can determine the OE polarity and The value of the data polarity.
2.3 Determine the color
Gray-free display is divided into monochrome, two-color and full-color three, which generally corresponds to the red monochrome; two colors are generally red and green two colors; full color is generally red, green and blue three colors. For the monochrome screen, this step can be omitted; for the two-color screen, red order down, according to the displayed color, you can determine whether the normal display or red and green; for full-color screen, respectively, red and green , According to the color displayed, you can determine whether the normal display or red and green anti-color, red and blue anti-color or green and blue color.
2.4 Determine the scan mode
For the scan mode, the formula is: Module height / number of lit lines = scan mode. The design sent to determine the scanning mode of the command, according to the user to select the number of bright lines, with the formula to calculate the scan mode. As the scanning method is undetermined, the first to determine the high-denominator scan mode for data output, the number of rows of bright cap for the module height parameters.
2.5 to determine the order of walking
LED display is in accordance with a point of a point in order to display, but it uses the human eye vision delay characteristics, through a fast all-point full-screen images to achieve full-screen image display update effect, so before sending, The order of the points must be determined.
In order to get the order of the points, you can send a point by one second, and then record the location to determine. The specific implementation is as follows:
(1) send RBI command; (2) display module every second there will be an LED pixel is lit, carefully observe the order of these pixels point to confirm the order of light, the mouse can be used in the simulation display module diagram (3) Click "Next" after the completion of the RBI, the system will automatically record the point of the corresponding point (the figure of each box corresponds to the display module of a pixel) order.
In order to better help users determine the order of walking, the system also provides re-RBI, rollback, reset and deduction and other functions.
2.6 Determine the sequence
In addition to the order of highlights, but also to determine the highlights of the line order. In order to obtain the sequence, you can send a line by one second, send a point, and then record the location to determine. The specific implementation of the method is as follows: send line display command, observe the display driver board LED lights on the order of the relative position in the sequence of the corresponding order. When finished, click "Next" and the system will automatically record the sequence.
For the common specifications of the display, through the "2.5 to determine the order of walking order" section to determine the sequence, this step can be omitted, and in order to better help users determine the sequence, the system also provides re-order, Reset and other functions.
2.7 download the parameters to complete the intelligent configuration
After the above parameters are determined, according to the display data configuration format, re-organize the order and format, you can download to the display configuration, and then observe the correct, if correct, that is, to complete the intelligent configuration. In addition, if necessary, can be saved to the file for later use; if not correct, analyze the reasons, and then re-intelligent configuration.
3 Conclusion
This paper through the wizard, the user select the state, automatic judgments, etc., to achieve a smart LED display configuration method, and in the LED navigation software applications, users get the praise. Practice has proved that the method can help users quickly configure, light up the display, while reducing the installation and debugging threshold, the professional and technical personnel from the installation of the liberation of the project. The future technical staff do not need to the scene, ordinary engineering staff will be able to complete the corresponding work, just download the corresponding data file can be, without repeated debugging.