Color filter substrate and liquid crystal display panel

A color filter substrate, comprising:

• a plurality of photoresist blocks spaced apart from each other;
• a black matrix disposed between adjacent photoresist blocks;
• an optically thinner medium film disposed on the photoresist blocks and the black matrix;
• an overcoat layer covering the photoresist blocks, the black matrix, and the optically thinner medium film, wherein the optically thinner medium film covers a boundary between the photoresist blocks and the black matrix;
• and
• a substrate, wherein the photoresist blocks and the black matrix are disposed on a same side of the substrate, and the optically thinner medium film is disposed on a side of the photoresist blocks and the black matrix away from the substrate;
• wherein a refractive index of the optically thinner medium film is less than a refractive index of the overcoat layer;
• and
• wherein the refractive index of the optically thinner medium film satisfies:
• n=nOC×sin iincidence, wherein n is the refractive index of the optically thinner medium film, nOC is the refractive index of the overcoat layer, and iincidence is a preset incident critical angle.