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