Imaging colorimetry keeps color correct: Camera-based colorimeter maintains color and brightness uniformity of large LED video displays

摘要

Large video screens based on light-emitting diodes (LEDs) are now a common sight at many sports and concert venues. However, producing these displays presents several challenges. One significant issue is that unit-to-unit variations in color and brightness of individual LEDs make it difficult to construct a large-area display that exhibits uniform output. In addition, the aging characteristics of LEDs lead to changes in display performance over time. Imaging colorimetry can be used to automatically correct display output during construction and subsequent field maintenance.