{TAIL ~ Display pixels} and {HEAD ~ sensor pixels} of an EL display each have an EL element, and the sensor pixels each have a diode 
{ TAIL ~ Display pixels } and { HEAD ~ sensor pixels } of an EL display each have an EL element , and the sensor pixels each have a diode
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH