The invention discloses a liquid crystal display panel and a manufacturing method and an applied display device thereof. The liquid crystal display panel comprises a first substrate and a second substrate, wherein a public electrode is arranged on the inner side of the first substrate, a black matrix and a cushion layer are made of a same material and are formed as a whole on the pubic electrode, a switching connection cushion is arranged on the inner side of the second substrate, and the integrated structure corresponding to the switching connection cushion has a hollow-out structure. A metal structure is arranged on the inner side of the second substrate and serves as the electrode connection joint to be connected with the switching connection cushion. The distribution shape of the metal structure is in complementary relation with that of the part, in the frame area, of the integrated structure, and the light leakage risk of the back edge of a module can be effectively prevented.