Researchers from Semiconductor Energy Laboratory (SEL) developed flexible OLED displays that incorporate organic image sensors inside the OLED pixels using side-by-side patterning. The sensors can be used as cameras for applications such as fingerprint sensing - which will work on the entire display.
SEL presented two prototypes, one a 3.07" 360x540 (212 PPI) display and the second is a 8" one with a higher pixel density of 302 PPI. SEL says that the fingerprint recognition works even when the display is bent.
A similar take on this technology is used by the Fraunhofer in its bi-directional OLED microdisplays - for different applications. In 2015 Fujifilm and imec also presented OLED patterning technology that can be used to create bi-directional displays.