Method for manufacturing flexible substrate, flexible substrate and display device

A method for manufacturing a flexible substrate, comprising steps of:

• coating a glass carrier with a plurality of film layers, wherein each of at least one pair of adjacent film layers of the plurality of film layers is formed through steps of:
• S1:
• coating the glass carrier with a first film layer;
• and
• S2:
• coating the glass carrier with a second film layer over the first film layer so that the second film layer covers the first film layer, wherein the second film layer has an area greater than an area of the first film layer;
• and
• peeling off the plurality of film layers from the glass carrier to form the flexible substrate,
• wherein a portion having an unstable thickness is formed at an edge of the first film layer during the step S1, the first film layer being made from polyimide, and the portion having the unstable thickness is covered by the second film layer so that the portion having the unstable thickness is only formed at an edge of the second film layer,
• wherein the portion having the unstable thickness is a raised portion, a height of which is 10% of a thickness of the film layers, and
• wherein the glass carrier is coated with the first film layer and the second film layer by means of a slit extrusion coating.