Flexible display screen and electronic device

An electronic device, comprising:

• a flexible display screen, wherein the flexible display screen comprises:
• a flexible substrate provided with a foldable portion;
• pixel units disposed on a first surface of the flexible substrate;
• and
• a fold detection device, comprising a reflective grating structure, an optical waveguide structure and a photoelectric sensor, wherein the optical waveguide structure and the reflective grating structure are sequentially laminated on the first surface of the flexible substrate and both disposed in the foldable portion, an orthographic projection of the optical waveguide structure onto the flexible substrate is overlapped with an orthographic projection of the reflective grating structure onto the flexible substrate, the optical waveguide structure is connected to the photoelectric sensor and comprises an isolation layer, a transparent conductive layer and a passivation layer laminated on the flexible substrate, and the isolation layer and the passivation layer have a smaller refractive index than the transparent conductive layer;
• and the reflective grating structure is disposed on the passivation layer, the passivation layer has a protruding structure stretching into the transparent conductive layer, and the protruding structure has an inclined surface at a specified angle to the flexible substrate, the specified angle being greater than 0 degree and less than 90 degrees.