Electronically switchable privacy film and display device having same

摘要

An electronically switchable privacy film suitable for use in display devices are described. The electronically switchable privacy film comprises a pair of mutually opposing transparent electrodes; an optically transparent microstructured layer disposed between the transparent electrodes, the microstructured layer comprising a plurality of microstructured ribs extending across a surface thereof such that the microstructured ribs form an alternating series of ribs and channels; and electronically switchable material disposed in the channels, the electronically switchable material being capable of modulation between high and low light scattering states upon application of an electric field across the transparent electrodes.

主权项

1. An electronically switchable privacy film comprising:
a pair of mutually opposing transparent electrodes; an optically transparent microstructured layer disposed between the transparent electrodes, the microstructured layer comprising a plurality of microstructured ribs extending across a surface thereof such that the microstructured ribs form an alternating series of ribs and channels; electronically switchable material disposed in the channels, the electronically switchable material being capable of modulation between high and low light scattering states upon application of an electric field across the transparent electrodes; wherein: when the electric field is not applied, the film is in a privacy mode such that it has a haze of at least 70% at viewing angles from about 30° to 45°; when the electric field is applied, the film is in the share mode such that it has a haze less than 35% at a viewing angle of about 45°, the film has a light transmission of at least about 25% in share and privacy modes at viewing angles from 0 to about 15°.