LED screen for train station

Uneven brightness across an LED display creates a distracting patchy appearance that undermines content quality and viewer experience. Common causes include manufacturing LED bin variations, aging differences between panels installed at different times, inconsistent power supply voltage delivery, and viewing angle effects on curved installations. Measurement using a calibrated luminance meter at multiple points across the display surface quantifies the degree of non-uniformity. Software-based brightness calibration using a camera or photometer captures the current state of every module and generates correction coefficients that bring all areas to a matched level. This process necessarily reduces the overall maximum brightness to the level of the dimmest panel, so maintaining uniform panels from the start preserves the full brightness capability.