Display panel and manufacturing method thereof and display device

A manufacturing method of a display panel, wherein the display panel comprises a first substrate and a second substrate, the manufacturing method comprising:

• using a photolithography process to form a first spacer in an auxiliary region of the second substrate;
• disposing a sealant in an auxiliary region of the first substrate or on the first spacer, wherein a position of the first spacer corresponds to a position of the sealant;
• assembling the second substrate and the first substrate to form the display panel;
• and
• providing at least one groove on a surface of the first spacer contacting the sealant;
• wherein, the second substrate is a color filter substrate, and the color filter substrate comprises a first base substrate and a black light shielding layer disposed on the first base substrate,
• wherein using the photolithography process to form the first spacer in the auxiliary region of the second substrate comprises:
• using a film forming process to form a first spacer layer on the second substrate, wherein the using the film forming process to form the first spacer layer on the second substrate comprises:
• using the film forming process to form the first spacer layer on the black light shielding layer, and
• wherein a distance between the bottom of the first spacer and the bottom of the groove is bigger than zero;
• wherein the color filter substrate further comprises a protecting layer disposed on a surface of the black light shielding layer;
• and
• the first spacer is disposed on the protecting layer and a position of the first spacer on the protecting layer corresponds to a position of the sealant.