The display device should be capable of producing a legible and interpretable image on the screen, even at the highest level of overall ambient illumination in the environment.
Additional Information: The visual display screen contrast ratio should be a minimum of 3:1 under ambient illumination of 1,000 lux (lx) (93 foot-candles (fc)) (Lambertian glare). See IDMS (2012) for measurement information.100