In the embodiment of the present disclosure, by removing the second substrate layer of the base substrate in the display region, the transmittance of blue light in the transparent display region can be increased, and the purpose of improving the photographing effect of the camera can be achieved.

For example, as shown in FIG. 2 and FIG. 9, the thickness of the second substrate layer 120 located in the peripheral region 300 is even to ensure a good adhesion effect between the fourth substrate layer 150 and the third substrate layer 130.

For example, the thickness of the second substrate layer 120 located in the peripheral region 300 can be greater than 15 nanometers.

The characteristics, such as material, shape and thickness, etc., of the first substrate layer 110, the third substrate layer 130 and the fourth substrate layer 150 included in the base substrate in the embodiment shown in FIG. 9 are the same as those of the three film layers included in the embodiment shown in FIG. 3B, and details will not be repeated here.

The characteristics, such as structure, arrangement, and positional relationship with the transparent display region, of the pixel unit in the embodiment shown in FIG. 9 are the same as those of the pixel unit in the embodiment shown in FIG. 3B, and details will not be repeated here.