LED display box calibration can greatly improve the display quality of the spliced ​​display, and the relative field correction efficiency is higher, not limited by time and space, and the cost is also low. Therefore, the cabinet correction technology will become an indispensable part of the LED display manufacturing process, and has a good application prospect.
Due to the discreteness, attenuation and discreteness of the circuit components of the LED light-emitting tube, the LED display screen has a phenomenon in which the brightness and the chromaticity are inconsistent, which seriously affects the display quality. In order to overcome the problem of brightness and chromaticity non-uniformity of LED display screen, point-by-point correction technology emerges as the times require, and it develops rapidly. It can significantly improve the uniformity of LED display and improve display quality.
Depending on the application, point-by-point calibration techniques can be divided into two types: one is box-by-box correction on the production line (box correction); the other is on-site large-screen correction (field correction). The on-site calibration technology can select the appropriate viewing location for calibration to ensure that the LED display achieves satisfactory display performance in the field application environment, but the complex and varied on-site environment and off-site technical support are the problems that limit the field calibration. In particular, the cost and difficulty of on-site calibration of some foreign orders are relatively large.
In order to ensure the uniformity of the factory LED screen body and reduce the technical support cost, the cabinet correction technology reflects its unique value. The cabinet calibration can greatly improve the display quality of the spliced ​​display, and the relative field correction efficiency is higher, not limited by time and space, and the cost is also low. Therefore, the cabinet correction technology will become an indispensable part of the LED display manufacturing process, and has a good application prospect.
First, LED display box calibration
Box calibration is a type of line correction that requires LED display manufacturers to add this link to the production line. Under normal circumstances, the cabinet calibration is arranged in the last link before leaving the factory, mainly to eliminate the difference in brightness and chromaticity between the interior of the cabinet and the cabinet, and improve the uniformity of the LED display after splicing.
In addition to adding corrections in the production process, manufacturers generally need to follow the correction effect of the factory. There are three commonly used methods: one is to splicing all the boxes together to observe the display effect, but the splicing workload is relatively large, which is inconvenient to implement; the second is to randomly extract some boxes for splicing and observe the correction effect; It is the simulation evaluation of the correction effect of all the cabinets by using the measurement data recorded by the calibration system. LED production lines for cabinet calibration and simulation evaluation/sampling are added.
The cabinet calibration needs to be performed in the darkroom. It needs to be equipped with an area array imaging device and a colorimeter to measure the brightness and chromaticity information of each cabinet. In order to ensure that the calibration process of all cabinets is carried out under the influence of external environmental conditions, the goal of brightness and chromaticity consistency is required, and the darkroom is completely sealed, and the temperature and humidity are constant. In the calibration process, it must be fixed. The position of the cabinet and the calibration instrument must be placed on the base to avoid the influence of ground reflection.
Similar to on-site calibration, for each cabinet, the process of cabinet calibration includes data acquisition, data analysis, target value setting, correction factor calculation, and coefficient uploading, as well as control system coordination.
Second, key technologies and difficulties
The cabinet calibration is an effective way to improve the image quality of the LED display. The key technical aspects are mainly reflected in the following two aspects: one is the uniformity between the pixels inside the cabinet, and the other is the consistency of the bright color between the cabinets.
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