DLPA078B February 2017 – September 2021 DLP160AP , DLP160CP , DLP2000 , DLP2010 , DLP230GP , DLP230KP , DLP230NP , DLP3010 , DLP3310 , DLP4710 , DLP471TP , DLPC3420 , DLPC3421
Brightness uniformity describes the variation in the brightness levels of different points across a projected image. To measure brightness uniformity, an all-white image is projected, and then the illuminance (lux) is measured at nine points across the image (an equally spaced 3 × 3 array). Brightness uniformity is then calculated as:
Brightness uniformity of 100% would describe a perfectly uniform projected white image with equal brightness levels at each point. Brightness uniformity of DLP Pico projection optical modules typically ranges between 70 to 90 percent. Variation in brightness uniformity is caused by variations in optical component performance, truncation of optical elements due to size constraints, and optical misalignment. The importance of brightness uniformity depends on the application and image content being projected. For example, even relatively low brightness uniformity can be difficult to detect with typical movie or TV show content, while a solid color can make the differences in brightness more obvious.