Online calibration system and online calibration method for ununiformity of LED (light-emitting diode) display screen

Abstract

The invention discloses an online calibration system and an online calibration method for ununiformity of an LED (light-emitting diode) display screen. The online calibration system and the online calibration method mainly solve problems that an existing test method is only used for testing brightness uniformity, tested brightness uniformity index cannot reflect an overall performance of an LED display screen, and ununiformity calibration cannot be carried out according to tested data. The online calibration method includes steps of acquiring test images displayed by the LED display screen by a camera, and dividing LED lamp points by a method based on background prediction after noise is eliminated; repositioning luminous zones of the lamp points and component pixels of the luminous zones; and then mixing the lamp points to form colors of the pixels, and fitting acquired chromaticity coordinates of the lamp points to form a Gaussian curve after gross errors are eliminated, and solving a mean value of the chromaticity coordinates; substituting the mean value of the chromaticity coordinates into a uniformity evaluation formula to evaluate the uniformity; and finally generating a calibration matrix and performing online real-time online ununiformity calibration point by point. The online calibration method for the ununiformity of the LED display screen is high in precision and efficiency and good in stability, is simple, convenient and feasible, and is capable of being used for testing a uniformity display performance and ununiformity calibration for the LED display screen.

Description

technical field [0001] The invention relates to the field of measurement technology, and relates to the evaluation and correction of the display uniformity of LED display screens, which can be used for performance testing and non-uniformity correction of LED display screens before leaving the factory and at installation sites. Background technique [0002] Light-emitting diodes (LEDs) have the advantages of short response time, high display brightness, and good linearity. Therefore, they have been used in the display field since their birth. In recent years, they have been used to manufacture large display screens such as outdoor large screens and stadium competitions. Display and indoor large-screen display, etc. [0003] However, in the development, production and application of LED display screens, due to the manufacturing process and device aging, there are inconsistent doping concentrations during LED chip manufacturing, inconsistent lamp cup curvature during LED packag...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose an LED display non-uniformity online correction system and correction method to solve the problem that the existing uniformity test method cannot test the chromaticity uniformity, and the measured uniformity index cannot reflect the overall performance of the LED display , and the problem that the test indicators and data cannot be corrected for non-uniformity in the later stage

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