Display panel, preparing method thereof, and display device

A display panel, comprising:

• a substrate, a plurality of sub-pixel units formed on the substrate, and a plurality of Metal-Insulator-Thin Film Metal-Insulator-Metal (MIMIM) dual-resonance structures;
• wherein
• the plurality of sub-pixel units comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit, and each of the sub-pixel units comprises an oxide Thin Film Transistor (TFT);
• the MIMIM dual-resonance structure comprises a first metal layer, a first insulator layer, a light absorbing layer, a second insulator layer and a second metal layer, wherein the first metal layer, the first insulator layer, the light absorbing layer, the second insulator layer and the second metal layer are laminated sequentially in that order in a direction away from the substrate;
• the first metal layer, the first insulator layer and the light absorbing layer constitute a lower Fabry-Perot (FP) cavity;
• the light absorbing layer, the second insulator layer and the second metal layer constitute an upper FP cavity;
• a spacing area is formed between adjacent ones of the sub-pixel units;
• the second metal layer comprises a metal signal line arranged in the spacing area;
• an orthographic projection of the light absorbing layer onto the substrate overlaps an projection of the metal signal line onto the substrate at an overlapping area;
• the light absorbing layer is configured to absorb incident blue light;
• a first spacing area is formed between the blue sub-pixel unit and a sub-pixel unit adjacent to the blue sub-pixel unit;
• the MIMIM dual-resonance structure is arranged in the first spacing area, and is located between the blue sub-pixel unit and the oxide TFT of the sub-pixel unit adjacent to the blue sub-pixel unit.