Abstract: A method for performing a series of optical measurements on an activated display, whether or not it has already been mounted in an actual display device, the activated display having an optical characteristic with a performance that changes during and/or between the measurements of the series of optical measurements that are configured as a sequence of measurements comprising a pair of identical 2D image measurements or a pair of identical spot measurements in combination with a 2D image measurement to determine at least one of luminance, color-point and spectral distribution of emitted light, and the distributions of luminance and color-point over the entire light-emitting area of the activated display with an improved accuracy. An optical measurement setup for performing the series of optical measurements in accordance with the method.