Our directional lightguide film (DLGF) is an LGP that features highly directional and uniform output. Practically, DLGF could work as a backlight unit on its own, without any supportive optical film stack, such as reflectors, BEFs and diffusers. In fact, this approach has been successfully implemented in automotive applications, where our component has been applied to an LCD display to create a switchable privacy function.
The naturally sparse microstructure distribution on the LGP surface results in nearly undisturbed see-through viewing properties on the component level. This property has been deployed, for example, in biometric authentication utilizing far field NIR imaging through an LCD display module, as well as in transparent hidden-until-lit human-machine interfaces (HMI). Moreover, our DLGF has been applied in high-resolution on-display fingerprint sensing applications, based on the same functional merits