For example, as shown in FIGS. 2-3B, the second substrate layer 120 located in the transparent display region 221 includes a first pattern 121, and the orthographic projection of the first pattern 121 on the first substrate layer 110 coincides with the orthographic projection of the second electrode 142 on the first substrate layer 110, that is, the first pattern 121 is located in the pixel region 2210. That is to say, the second substrate layer 120 can be patterned with the same mask plate as the second electrode 142 in the organic light emitting element, so as to save the mask plate process. For example, the first substrate layer 110 and the third substrate layer 130 in the embodiment of the present disclosure are continuous integral layers so that the base substrate is a continuous layer. The coincidence of the orthographic projections of the first pattern and the second electrode on the first substrate layer can include a complete coincidence or approximate coincidence of the orthographic projections, and the approximate coincidence of the orthographic projections of the first pattern and the second electrode means that the coincidence rate of the orthographic projections is greater than 95%.
