DL901D is a 8.9” LCD 405nm backlight module developed for 3D LCD printing of dentistry application with well collimated 405nm UV LEDs array. The designed collimation angle (HWHM) of DL901D is ±8 degrees, and the minimal irradiance after Mono-LCD is over 4mw/cm2. With good irradiance uniformity, DL901D can well meet the needs of 3D printing for dentistry application.