Display device

1 . A display device comprising:

a plurality of pixels including a first pixel, a second pixel and a third pixel; and

a bank provided between each respective adjacent pair of the pixels,

each of the plurality of pixels comprising, on a base:

an anode;

an organic EL layer provided on the anode;

at least one set of sidewall pairs provided to cover a side surface of the organic EL layer; and

a cathode provided in an opening portion of the bank and in contact with the organic EL layer, and

the at least one set of side wall pairs comprising:

a first sidewall formed of aluminum oxide; and

a second sidewall formed of silicon nitride, and

the first pixel including at least two sets of the side wall pairs, and

the second pixel including at least one set of the sidewall pair.

2 . The display device according to claim 1 , wherein

the first pixel includes three sets of the sidewall pairs,

the second pixel includes two sets of the sidewall pairs, and

the third pixel includes one set of the sidewall pair.

3 . The display device according to claim 1 , wherein

the first pixel includes two sets of the sidewall pairs,

the second pixel includes one set of the sidewall pair; and

the third pixel includes a side wall formed of aluminum oxide.

4 . The display device according to claim 1 , further comprising:

an upper layer formed of aluminum oxide on the organic EL layer.