an array substrate;

a luminescent layer located on one side of the array substrate, wherein the array substrate is configured for driving the luminescent layer to emit light;

a plurality of optical film layers located on a side, away from the array substrate, of the luminescent layer, wherein light emitted by the luminescent layer forms an optical waveguide on the array substrate and/or the optical film layers; and

a photoelectric sensor, configured for acquiring the optical waveguide to perform compensation of brightness on the light emitted by the luminescent layer according to data of the optical waveguide,

wherein the luminescent layer comprises a plurality of sub-luminescent layers, the plurality of sub-luminescent layers are disposed on a same layer at intervals, the array substrate comprises:

a first pixel defining layer located between two adjacent said sub-luminescent layers, the photoelectric sensor is disposed corresponding to the first pixel defining layer, the luminescent layer further comprises a first reflecting layer attached to a surface of the first pixel defining layer, and the optical waveguide passes through the first pixel defining layer and is reflected by the first reflecting layer to the photoelectric sensor.