Manufacturing method of mini-led backlight plate and mini-led backlight plate

A manufacturing method of a mini light emitting diode (mini-LED) backlight plate, comprising:

• providing a substrate, defining a plurality of display regions on a surface of a side of the substrate, wherein other region on the surface of the side of the substrate except for the plurality of display regions is a non-display region, and defining a plurality of cutting regions separating any two adjacent display regions in the non-display region;
• covering the surface of the side of the substrate by a mask, covering the plurality of display regions and part of the non-display region on the surface of the side of the substrate by the mask to allow the plurality of cutting regions to be exposed outside, and adopting a hydrophilic material to form a layer of a thin film on the plurality of cutting regions;
• removing the mask, and coating a hydrophobic material on the entire surface of the side of the substrate to form a passivation coating layer;
• and
• cutting the substrate along the plurality of cutting regions to form a sheet of a backlight plate.