First, point-by-point correction technology concept
The current status of LED chip production process determines that even in the same batch of LED chips, the inter-individual luminous intensity and the dominant wavelength still have considerable differences. For LED display applications, this difference will seriously affect the display quality. It is necessary to first classify and filter the indicators such as luminosity, chromaticity and electrical parameters by spectroscopic color separation before they can be applied to the same display.
However, the method of splitting and color separation is used to solve the problem of inconsistent chromaticity of individual chips. Due to the lack of precision, the influence of subsequent process flow, and the inconsistent light decay of the aging process, the perfect picture quality cannot be achieved. In addition, the display screen that has been used for a period of time will also show a drop in quality due to inconsistencies such as light decay, and a “flower screen†will appear, which is also beyond the wavelength separation.
Therefore, the industry is trying to solve the problem by using the last driver of the difference in LED lighting points. This is point-by-point correction.
In the late 1990s, there was a theoretical prototype of point-by-point correction at home and abroad, and the practical exploration of this technology was initiated. However, due to the lack of applicable universal data collection tools and technical barriers, the research of this technology has been discontinuous and unsystematic for a long time, and it lacks a communication state. The point-by-point correction also lacks a recognized definition. Currently, the more complete definition is as follows:
Point-by-point correction, that is, by collecting the luminance (and chrominance) data of each lamp dot area on the LED screen, and obtaining a correction coefficient for each lamp point (or a coefficient matrix for each pixel), Feedback to the control system of the display, the control system applies the correction factor to achieve differential drive for each lamp point, thereby greatly improving the pixel brightness (chroma) uniformity of the display.
Second, the future development trend of point-by-point correction technology
Point-by-point correction After the long period of germination in the late 1990s and 2008, and the rapid growth period in 2008-2010, the process will be further refined and the process will be further refined in the process of accumulation of theory and practice. In the process of standardization, agreement unification, and evaluation of standardization, it gradually entered its maturity.
2.1 Technical division of labor is further refined and specialized
In the trend of increasingly detailed and specialized division of industry, the point-by-point calibration acquisition equipment also presents a trend of separation from the control system and an increasingly specialized trend.
With the pursuit of high quality and the promotion of market competition, more and more enterprises use professional point-by-point calibration acquisition equipment to cure point-by-point calibration into a standard process, not just the emergency after the product has quality problems. Policy. Only professional subdivisions can achieve wide compatibility, and all segments can be continuously and intensively cultivated by professional teams, complementing resources and promoting technological progress.
2.2 Faster, easier, automated, standardized
Point-by-point correction technology has taken a month from the initial machine to correct a large screen, and has developed into today's nearly 200 square large screen correction overnight, and has made epoch-making progress. Future point-by-point corrections will continue along the path of efficient, simple, automated, and standardized, an inevitable trend determined by industry demand. On the road to achieve this goal, in addition to the technological innovation of the collection equipment, it is necessary to cooperate and support the industry control system partners, the construction and promotion of industry standards, and the experience accumulation and exchange of point-by-point correction practitioners.
3.3 Data storage to the module
The LED display manufacturing industry's production mode has always been order-based production. Nowadays, many large factories have begun to explore planned production modes. On the one hand, they can shorten the supply cycle and produce competitive advantages. On the other hand, standardized production can be scaled and managed. Produce benefits and competitive advantages. Planned production means module or standard tank inventory, meaning a combination of diversity at the time of shipment;
To accommodate the requirements of planned production, the best way to store data point by point is to place it on the module, rather than on the receiving card of the control system. After the module or the cabinet is assembled into the display screen, the control system reads back the correction data on the module, or after reading the original data, generates a correction coefficient according to the correction target value and applies it. Such a technical structure will make data maintenance work after replacing the module a breeze. In fact, internationally renowned LED screen manufacturers, such as Barco and Lighthouse, use this method of correcting data storage.
However, to achieve this goal, there is still a need for a unified data communication protocol between the control system and the module.
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