A prism module , suitable for being arranged on an edge area (EA) of a display area and a frame area of a display, in order to achieve a borderless display effect, wherein the display area has a plurality of corners (C), and the prism module comprises: a first prism , comprising a plurality of first corner portions , each of the first corner portions being correspondingly arranged in one of the corners (C) of the display area and having a first free-form curved surface (112S1); and a second prism , conformally disposed beside the first prism , the second prism comprising a plurality of second corner portions , each of the second corner portions having a second free-form curved surface (122S2) facing one of the first curved surfaces (112S1), wherein the first prism further comprises a plurality of first side portions , and the second prism further comprises a plurality of second side portions , wherein each of the first side portions further comprises a first side buffer portion and a first side main body portion , and the first side buffer portion is located between the first side main body portion and one of the first corner portions , wherein the first side main body portion has a first side edge (SE1), the first side buffer portion has a first inclined side edge (IE1) inclining relative to the first side edge (SE1), each of the second side portions further comprises a second side buffer portion and a second side main body portion , the second side main body portion has a second side edge (SE2), and the second side buffer portion has a second inclined side edge (IE2) inclining relative to the second side edge (SE2), and wherein a gap (G) is between the first free-form curved surface (112S1) and the second free-form curved surface (122S2). a first prism , comprising a plurality of first corner portions , each of the first corner portions being correspondingly arranged in one of the corners (C) of the display area and having a first free-form curved surface (112S1); and a second prism , conformally disposed beside the first prism , the second prism comprising a plurality of second corner portions , each of the second corner portions having a second free-form curved surface (122S2) facing one of the first curved surfaces (112S1), wherein the first prism further comprises a plurality of first side portions , and the second prism further comprises a plurality of second side portions , wherein each of the first side portions further comprises a first side buffer portion and a first side main body portion , and the first side buffer portion is located between the first side main body portion and one of the first corner portions , wherein the first side main body portion has a first side edge (SE1), the first side buffer portion has a first inclined side edge (IE1) inclining relative to the first side edge (SE1), each of the second side portions further comprises a second side buffer portion and a second side main body portion , the second side main body portion has a second side edge (SE2), and the second side buffer portion has a second inclined side edge (IE2) inclining relative to the second side edge (SE2), and wherein a gap (G) is between the first free-form curved surface (112S1) and the second free-form curved surface (122S2). <EOS>