Method for producing an optical filter for homogenising an inhomogeneously luminescing surface

摘要

A method, which is relatively easy to implement, is proposed for producing an optical filter, by means of which virtually any inhomogeneously luminescing surface can be homogenised to obtain a luminescing surface of uniform luminance or surface luminosity, e.g. a luminescing surface of an illuminant, a scale illumination such as e.g. a light-guiding plate for illuminating liquid crystal displays, luminescing surfaces in interior lighting systems or in optical imaging systems or the like. In this production method, the luminance which varies over the respective luminescent surface is detected and used for filter production of the optical filter in such a manner that a transparency of the virtually complementary optical filter is produced which varies over the filter surface and corresponds to an inverse imaging of the luminescing surface. This method has the advantage that the entire brightness structure of the respective, inhomogeneously luminescing surface is taken into account and converted into a corresponding transparency structure of the filter, so that the desired homogenisation of the luminance is obtained in the case of a combination of the inhomogeneously luminescing surface with the filter specially produced for this surface.