Alternatively, {HEAD ~ the spacers} are formed in {TAIL ~ light shielding regions} of the pixel array in a width smaller than the width of the light shielding regions 
are formed in
Alternatively , { HEAD ~ the spacers } are formed in { TAIL ~ light shielding regions } of the pixel array in a width smaller than the width of the light shielding regions
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH