Transparent display panel, preparation method thereof and display device

A display device, comprising a transparent display panel, wherein the transparent display panel comprises a plurality of sub-pixels, and further comprises:

• a base substrate;
• a light guide substrate, arranged opposite to the base substrate, and comprising:
• a plurality of light entering regions, and
• a plurality of light emitting regions spaced from the plurality of light entering regions,
• wherein each sub-pixel comprises one light entering region and one light emitting region, different sub-pixels comprise different light entering regions and different light emitting regions;
• a liquid crystal layer, disposed between the base substrate and the light guide substrate;
• a bearing layer, disposed between the base substrate and the liquid crystal layer, and comprising:
• a plurality of concave structures spaced from each other, disposed on a side of the bearing layer facing the liquid crystal layer,
• wherein each sub-pixel comprises one concave structure, different sub-pixels comprise different concave structures, no bearing layer is disposed between adjacent sub-pixels;
• and a thickness of the bearing layer in a direction perpendicular to the base substrate ranges from 4 to 8 microns;
• and
• a plurality of reflecting structures, disposed on a side of the concave structures facing the liquid crystal layer,
• wherein an orthographic projection of the concave structures on the base substrate covers an orthographic projection of the reflecting structures on the base substrate;
• wherein in a sub-pixel,
• the reflecting structure on the concave structure comprised in the sub-pixel reflect incident light to obtain emitted light, so that the emitted light is emitted by penetrating through the light emitting region comprised in the sub-pixel;
• the incident light is incident on the reflecting structure, through the liquid crystal layer, from the light entering region comprised in the sub-pixel;
• a cross section, in a direction parallel to a row of the plurality of sub-pixels and perpendicular to the base substrate, of the concave structure comprised in the sub-pixel is a triangle;
• the triangle has a first edge, a second edge and a third edge connected in sequence;
• the first edge and the second edge are located at side edges of the concave structure, and the third edge is located at an opening of the concave structure;
• a length of the second edge is greater than a length of the first edge;
• an included angle between the second edge and the third edge ranges from 20° to 40°,
• the reflecting structure is disposed only on the second edge of the concave structure;
• and a length of the reflecting structure along the second edge is 12 microns.