OLED display also functions as a multichannel speaker array where each pixel-like piezoelectric exciter simultaneously emits a different sound

https://www.eurekalert.org/news-releases/1084704

"embedded exciters are ultra-thin, sound is crosstalk-free without external soundbars/ multi-channel speakers... localized sound experiences: from same screen car driver could hear navigation instructions while passenger listens to music, spatial sound can dynamically adapt to user’s head or hand movements, enhancing realism/ immersion... smartphones, laptops, automotive displays, VR"