The single mask could be structured laterally like the mask of FIG. 5, namely with a region 50 a 1, 50 a 2 which does not transmit and blocks, respectively, a broadband incident light laterally selectively, namely particularly at the opening region, a region 50 b which only transmits light in a first spectral range, namely for the continuous cross-linking in the frame region, and a region 50 c, wh