P-type semiconductor layers coupled to N-type semiconductor layers

A device comprising:

• an array of diode pairs, each diode pair comprising:
• a monolithic N-type semiconductor layer having a first portion and a second portion, the first portion having a first surface and the second portion having a second surface facing away from the first surface;
• a monolithic P-type semiconductor layer coupled to the monolithic N-type semiconductor layer, the monolithic P-type semiconductor layer having a third portion and a fourth portion, the third portion having a third surface and the fourth portion having a fourth surface facing away from the third surface;
• a first contact coupled to the first surface;
• a second contact coupled to the second surface;
• a third contact coupled to the third surface;
• and
• a fourth contact coupled to the fourth surface;
• and
• an array of first electrodes, each first electrode electrically coupled to the first contact and the fourth contact of a corresponding diode pair of the array of diode pairs or to the second contact and the third contact of the corresponding diode pair,
• wherein each diode pair comprises a first light emitting diode (LED) having a first orientation and a second LED having a second orientation opposite to the first orientation.

A device comprising:

• an array of diode pairs, each diode pair comprising:
• a monolithic N-type semiconductor layer having a first portion and a second portion, the first portion having a first surface and the second portion having a second surface facing away from the first surface;
• a monolithic P-type semiconductor layer coupled to the monolithic N-type semiconductor layer, the monolithic P-type semiconductor layer having a third portion and a fourth portion, the third portion having a third surface and the fourth portion having a fourth surface facing away from the third surface;
• a first contact coupled to the first surface;
• a second contact coupled to the second surface;
• a third contact coupled to the third surface;
• and
• a fourth contact coupled to the fourth surface;
• and
• an array of first electrodes, each first electrode electrically coupled to the first contact and the fourth contact of a diode pair of the array of diode pairs or to the second contact and the third contact of a diode pair of the array of diode pairs,
• wherein each diode pair comprises a first sensor having a first orientation and a second sensor having a second orientation opposite to the first orientation.