Performance Parameters settings 1.1. Refresh rate: The rate of LED display updates the image. The higher refresh rate can make the image more stable. 1.2. Grayscale level: In general, two-color display can select 256, full-color indoor is 16384, outdoor would be 4096. Of course, you can also increase the gray level according to the requirements of the display. The higher the gray level, the better image quality. 1.3. DCLK frequency: Data shift clock frequency. If this parameter is too large, the display may appear flicker or scramble issue. It is recommended that the smaller the better. Usually do not set it more than 17.9 MHz. 1.4. DCLK duty cycle: The ratio of the high and low levels of the clock signal. When there are cascaded overmuch modules, there may have signal distortion, the data can be more accurately acquired by increasing the duty cycle. 1.5. DCLK Phase: The offset of the data shift clock relative to DATA. It is used for data acquisition error occurred, adjusting this parameter can collect data accurately. Sometimes there is a dislocation or flash point in the display. Adjusting this parameter can fix those issue. 1.6. Refresh Rate Times: it is used to increase the refresh rate. 1.7. Line erasing time: Use this parameter to adjust the afterglow of the scan screen. If the afterglow is severe, please increase this value. 1.8. Afterglow end time: Adjust the scan screen, usually, cooperate with the line blanking time and line feed time. 1.9. Line feed time: Adjust the scan screen, cooperate with line blanking time. 1.10. GCLK frequency: The clock frequency of grayscale implementation. If set this value higher will cause the low grayscale effect to be not good, but the refresh rate and gray scale will be higher. 1.11. GCLK Phase: The offset of the grayscale clock for data. 1.12. GCLK duty cycle: The ratio of the high and low levels of the grayscale clock. The unreasonable value will make the low grayscale effect poor, and non-uniformity, 50% is recommended. 1.13. Brightness efficiency: The ratio of the lighting time of the LED within 1 frame. 1.14. Eliminate afterglow: Adjust the registers of driver chips to eliminate ghosting in the vertical direction, which caused by parasitic capacitance. 1.15. Large load: As for “large load” , it depends on whether our large table uses the 2Byte format or the 4Byte format. The 2Byte mode has a maximum load of 65536 points or 256 x
The 4Byte mode theory can carry 4 billion points. In order to easy to do the upgrade and maintenance, our Axs cards unified used 4Byte mode processing. As for regular cabinets, the hardware has been processed in accordance with the 4Byte mode by default, so there is no problem, but for irregular cabinets (Triple Strip Outputs, Quadruple Strip Outputs also take as irregular cabinets) need to calculate the large table by LCT, so need to tell LCT software to use 2Byte or 4Byte mode, check the means used large load 4Byte mode, unchecked is 2Byte. As for now, the receiving cards of irregular cabinets what we need to check the large load and corresponding program version as follows: A4s/A5s/A8s V220.127.116.11 and above MRV316/316/308/328 V18.104.22.168 and above; A7s all versions; All versions of MRV281/481; 1.16. 18-bit mode: Nova’s 18bit+ technology combines the low-pass characteristics of time and space into one, and apply it to the display grayscale encoding technology for a new layout design. Therefore, with the 18bit+ display, at a certain viewing distance, the spatial and temporal grayscale information that is close to the visual system will be taken as a whole, thereby realizing a richer and more varied display characteristics. 1.17. Data group exchange: When the module and the receiving card connection are not arranged according to the default data group output, the receiving card output needs to be rearranged in software.
More Settings 2.1 Symmetrical/Data group extension Symmetrical outputs: the output of the receiving card data group changes from output of all data groups from top to bottom to all data groups into two parts, and the left and right parts are spliced together for output. Triple Strip Outputs: the output of the receiving card data group changes from output of all data groups from top to bottom to all data groups into three parts, and the left and right parts are spliced together. Quadruple Strip Outputs: the output of the receiving card data group changes from output of all data groups from top to bottom to all data groups into four parts, and the left and right parts are spliced together. 20 data groups: the receiving card sets the maximum number of output data groups to 20 groups. 24 data groups: the receiving card sets the maximum number of output data groups to 24 groups. 28 data groups: the receiving card sets the maximum number of output data groups to 28 groups. 32 data groups: the receiving card sets the maximum number of output data groups to 32 groups. Serial 128 data groups: set the maximum number of output data groups as 128 groups in receiving card serial mode. Signal switch: enable switch of CTRL signal, whether to do the blanking processing. Signal polarity: CTRL signal connected to 138 OE, effective at low or high levels. 2.2 HUB mode: General: the receive card definition outputs a pattern according to 16 sets of definitions. Group 20: the receive card definition outputs in accordance with the 20 defined patterns. Group 24: the receive card definition outputs in accordance with the 24 group definition patterns. Group 28: the receive card definition prints in accordance with the pattern defined in group 28. 2.3 Image output mode Output in the scanning direction: the image displayed from the first scan to the last scan. Inverse scan direction output: image displayed from the last scan to the first scan. 2.4 Adjustment of monitoring card data line Monitoring data line adjustment: adjust the R G B R ‘sequence on the monitor card. In order to solve the problem that the LED error detection or data line test is inconsistent with the actual display. 2.5 Additional functions Isolated point afterglow: When scanning, the image is alternately scanned forward and backward, it can make the afterglow dots close to the oblique line. (This function only applies to 74HC138 decoding and common chips.) Receiving card indicator light: Turn on or off the receiving card indicating status (green light). Shorten the synchronization time: Reduce the black field time between frames and eliminate the rolling black line problem of camera. Brightness changes slowly: When the brightness needs to change from 1% to 100%, the brightness changes slowly from 100% in a few seconds, not 100% immediately. EMC function: It is beneficial for EMC test to change the original high power and narrow spectrum into low power spectrum with wide frequency. Straight through mode: For AXs series CARDS, the load capacity is directly increased to maximum, but only for the tracing point of the lamp plate, the line is from left to right, and the scanning is from top to bottom. ABCDE delay: Phase difference between ABC for DE signal. 2.6 Flash layout of LED board FLASH arrangement: According to the output sequence of the hardware connection to set up the Flash arrangement, make sure the size and location of Bus is all correct. If FLASH arrangement is wrong, data storage error or hardware failure will occur. 2.7 Monitoring card data group exchange Monitor card data group exchange: Exchange the data groups on the monitor card.