An OLED array substrate comprising a first electrode layer , a pixel definition layer , an organic material functional layer , and a second electrode layer arranged successively in a light exit direction, wherein the organic material functional layer comprises light-emitting regions being configured to emit light of different colors, the pixel definition layer comprises pixel regions corresponding to the light-emitting regions and spacing regions arranged between adjacent pixel regions, and each spacing region is configured to electrically isolate adjacent light-emitting regions, wherein the organic material functional layer comprises a first functional layer , a light-emitting layer , and a second functional layer arranged successively in the light exit direction, and each spacing region comprises a first spacing portion and a second spacing portion arranged successively in the light exit direction, wherein a thickness of the first spacing portion is greater than a thickness of the first functional layer so that portions of the first functional layer corresponding to respective light-emitting regions are separated from each other, characterized in that , a sum of a thickness of the second spacing portion and the thickness of the first spacing portion is greater than a sum of the thickness of the first functional layer and a thickness of the light-emitting layer and smaller than a sum of the first functional layer , the thickness of the light-emitting layer and a thickness of the second functional layer , so that a plurality of second functional comprising the second functional layer and corresponding to respective light-emitting regions are connected with each other and continuous, whereas the first functional layer and the light-emitting layer of one light-emitting region are disconnected from the first functional layer and the light-emitting layer of any adjacent light-emitting region. the organic material functional layer comprises light-emitting regions being configured to emit light of different colors, the pixel definition layer comprises pixel regions corresponding to the light-emitting regions and spacing regions arranged between adjacent pixel regions, and each spacing region is configured to electrically isolate adjacent light-emitting regions, wherein the organic material functional layer comprises a first functional layer , a light-emitting layer , and a second functional layer arranged successively in the light exit direction, and each spacing region comprises a first spacing portion and a second spacing portion arranged successively in the light exit direction, wherein a thickness of the first spacing portion is greater than a thickness of the first functional layer so that portions of the first functional layer corresponding to respective light-emitting regions are separated from each other, characterized in that , a sum of a thickness of the second spacing portion and the thickness of the first spacing portion is greater than a sum of the thickness of the first functional layer and a thickness of the light-emitting layer and smaller than a sum of the first functional layer , the thickness of the light-emitting layer and a thickness of the second functional layer , so that a plurality of second functional comprising the second functional layer and corresponding to respective light-emitting regions are connected with each other and continuous, whereas the first functional layer and the light-emitting layer of one light-emitting region are disconnected from the first functional layer and the light-emitting layer of any adjacent light-emitting region. <EOS>