Colour film substrate and manufacturing method therefor, and display panel

A manufacturing method of a color filter (CF) substrate, comprising:

• providing a base substrate;
• and
• forming a black matrix layer and a plurality of first sub-pixel units on the base substrate, by coating a photoresist and patterning the photoresist to form the black matrix layer and the plurality of sub-pixel units in the same photoresist material, which comprises a red, green, blue or yellow pigment and an irreversible thermochromic pigment, the photoresist is capable of being changed into black color upon being heated, and a color of the photoresist before color change is the same as a color of the first sub-pixel units which is red, blue, green or yellow, the black matrix layer is formed by selectively heating the photoresist which is red, blue, green or yellow in the desired black matrix layer pattern to color the photoresist black,
• wherein a weight percent of the irreversible thermochromic pigment is more than 10 wt % and less than or equal to 25 wt %.