The uniformity correction and field correction of the interior of the box are similar, which is more mature, including brightness uniformity correction and bright line correction:
(1) Brightness uniformity correction through the measurement equipment to measure the LED box in the luminance and chroma information, its measurement methods involved in photometry, chroma and digital image processing related knowledge; According to the corresponding correction standard, the corresponding correction coefficient is calculated and sent to the receiving card of the corresponding box. After the box is illuminated, the display control system adjusts the LED's current according to the correction coefficient, which makes the brightness and chroma of all led in the box consistent.
Brightness correction is to adjust the fluctuation of the brightness of the led to a consistent level, in the process of adjusting the brightness needs to reduce the most of the maximum brightness of the LED. Chroma correction is based on RGB color matching principle, by changing RGB color coordinates to solve the problem of chroma deviation, in order to calibrate the color gamut, the large triangle is the color gamut of the front display, the color coordinate of RGB three colors is distributed, the small triangle is the corrected display color gamut, and the RGB tri-color color coordinate is better.
(2) Due to machining accuracy, assembling precision and other technological reasons, the gap between the stitching light plate is slightly inconsistent phenomenon, after the human eye vision system low-pass filtering process, in the display will appear bright line or dark. Because of the existing mechanical process limitation, the small spacing display screen can improve the uniformity of the box greatly after the bright dark lines are modified.