Picture display device provided with an automatic selectively transmissive coating

摘要

A picture display device is provided with a display screen for transmitting light in a spectral range, and a selectively transmissive coating. The local transmission of the coating in the spectral range is dependent on the radiation which is locally incident on the coating, while the transmission of the coating automatically decreases as the intensity of the incident radiation increases. The transmission of the coating is preferably dependent on the radiation which is incident on the coating at a wavelength outside the spectral range. Such a device has the advantage that the contrast is enhanced in an optimum way, even if the ambient light is not homogeneously distributed across the display screen.