Why does LED display need to be corrected point by point? Ideally, if the brightness and chromaticity of the light emitted by each pixel at any angle on the display screen are always the same, then the display screen can be considered to be uniform. In the actual production process, the uniformity of the display screen will be affected by many factors, so the uniformity of the LED display screen without correction cannot reach the ideal level, and the image quality is obviously different from other flat panel display technologies. There are many factors that lead to poor uniformity of the LED display, such as:
Discrete natural defects of LED itself:
(1) The LEDs provided by lamp manufacturers have differences in brightness and chromaticity
(2) The spatial distribution characteristics of LED luminous intensity are different, which will lead to inconsistency of the luminous intensity of different LEDs at any viewing angle relative to the attenuation value in the direction of the optical axis;
Many other factors introduced in the display manufacturing process:
(1) Flatness of module assembly
(2) Flatness of box assembly
(3) The flatness of the mask and the dispersion of ink colors
(4) Non-uniformity of heat distribution inside the module
(5) The direction of the optical axis deviates from the normal direction of the display screen during LED welding, especially the control of the direction of the optical axis of the LED.
Therefore, all LED screens have a problem of unsatisfactory uniformity to a certain extent when they leave the factory. Some problems arising from the use of the acquired day, and when the LED display is used for a period of time, due to the difference in individual light attenuation of the LED and other external factors, the uniformity will be further deteriorated. Bright and dark spots and even mosaics are commonly known as the "flower screen" phenomenon.
At present, the investment of display screens is tens of millions of millions, which are mostly used in commercial advertisements and performances, etc., and the image quality of the display screen is very high. The theoretical life of the LED display screen is 100,000 hours, but in fact, the uniformity of a display screen will deteriorate after about 5000 to 10000 hours of operation, and it will start to change flowers, and the commercial value will decrease. After 15000 to 20,000 hours, the commercial value Almost lost, causing a great waste of social resources.
Whether it is before leaving the factory or after a period of use, the point-by-point correction technology can allow users to greatly improve the uniformity of the display and significantly improve the image quality in a very short time and at a very low cost. Before being used in the factory, point-by-point correction is a means of quality improvement, which means the improvement of competitiveness and the expansion of profit space; after being used for a period of time, point-by-point correction can prolong the "eye-pleasing life" of LED displays. Users create more business value and reduce waste of resources.
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