Array substrate, method of preparing the same and display panel

A method of preparing an array substrate, comprising:

• providing a base substrate;
• forming a plurality of light emitting devices arranged in an array on the base substrate;
• covering the base substrate, on which the plurality of light emitting devices are formed, with a black matrix material;
• activating the plurality of light emitting devices to expose the black matrix material;
• and
• developing the exposed black matrix material to form a black matrix,
• wherein the step of forming a plurality of light emitting devices arranged in an array on the base substrate comprises:
• forming a plurality of first electrodes arranged in an array on the base substrate;
• forming a pixel defining, layer on the base substrate on which the plurality of first electrodes are formed;
• and
• forming a light emitting function layer and a second electrode layer in sequence on the base substrate on which the pixel defining layer is formed,
• wherein the pixel defining layer defines a plurality of light emitting regions arranged in an array, the plurality of light emitting regions are in one-to-one correspondence with the plurality of first electrodes, an orthographic projection of each of the light emitting regions on the base substrate falls within an orthographic projection of the corresponding first electrode on the base substrate, and
• wherein each of the light emitting function layer and the second electrode layer covers at least the plurality of light emitting regions wherein the black matrix remains only at the edges of the plurality of light emitting devices.