The early point-by-point calibration of the spectrometer is based on the point-by-point calibration technique of the spectrometer. It uses the principle of the spectrometer. The spectrometer uses a dichroic prism to split a point of light emitted at equal intervals and then converts the light through the CCD of the linear array. Spectral distribution was obtained to analyze its brightness and chromaticity. Some early LED display manufacturers used this technology, but this technology can only measure one point at a time, and the ambient temperature and other factors of the hand during the measurement process have a great influence. This makes the application of spectral point-by-point correction impossible to universally apply.
Mid-term correction method according to the LED running time This correction technique is based on the time decay curve provided by the manufacturer of LED lamps, recording the operating time of each LED module to correct the display screen. Through the running time of each LED module, their respective average luminance decay is calculated according to the curve, and the unreasonable correction level is estimated, but the estimated LED attenuation is not suitable for each LED. With the increase of the running time, the range of LED attenuation amplitude is getting larger and larger, and the correction can make a part of the LED lamp approach the correction level, but it is bound to make the other part more deviate. Can not effectively improve the problem of LED display, so the application of calibration methods is limited.
Late-camera LED point-by-point correction technology The camera-based point-by-point correction technology uses the camera to quickly and accurately collect the light color information of each pixel of the LED display screen in the computer, and then calculates the correction of each pixel through professional software. The coefficient matrix adjusts the brightness of the LED lamp according to the matrix so that the consistency of the LED display can be corrected. This mature calibration method can measure multiple points at one time, and can be quickly corrected in the field. It can solve the problem of unequal brightness and chromaticity caused by the use of LEDs for a long time, and prolong the service life of LED displays.
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