A backlight module comprising: a light source, a circuit board, a light guide plate, and a light shielding tape, wherein preferably a light-emitting region of the backlight module falls within a circle having a diameter less than or equal to 177.8 mm, and wherein the light source is disposed on a side surface of the light guide plate, a light-emitting side of the light source is next to the side surface of the light guide plate, another side of the light source is welded with the circuit board, and the circuit board is perpendicular to a light-exiting surface of the light guide plate; the light shielding tape overlaps a portion of the light-exiting surface of the light guide plate and covers the light source; the backlight module further comprising a heat-conducting housing, and the light source, the circuit board and the light guide plate are all located in the heat-conducting housing; the backlight module further comprising an auxiliary light shielding tape located between the light guide plate and the light shielding tape, wherein a plane where the light-exiting surface of the light guide plate is located is a target plane; the orthographic projection region of the auxiliary light shielding tape on the target plane is located within the orthographic projection region of the light shielding tape on the target plane; the backlight module further comprising: an optical film, a first transparent film, and a second transparent film, wherein an upper edge of the heat-conducting housing is provided with a bending portion that bends toward the inside of the heat-conducting housing, and the bending portion comprises a first platy structure, a second platy structure, a third platy structure and a fourth platy structure (205 ID) that are connected in sequence; wherein the first platy structure is perpendicular to the light exiting surface of the light guide plate; the second platy structure and the fourth platy structure (205 ID) are parallel with the target plane; the fourth platy structure (205 ID) is next to the light guide plate; and wherein the auxiliary light shielding tape and the first transparent film are superimposed on the light guide plate, and the auxiliary shielding light tape is also superimposed on the light source; the fourth platy structure is superimposed on an end of the auxiliary shielding light tape next to the light source; the second transparent film is superimposed on an end of the auxiliary light shielding tape away from the light source, and on the first transparent film; the optical film is superimposed on the second transparent film; and the light shielding tape is superimposed on the second platy structure and the optical film. a light source, a circuit board, a light guide plate, and a light shielding tape, wherein preferably a light-emitting region of the backlight module falls within a circle having a diameter less than or equal to 177.8 mm, and wherein the light source is disposed on a side surface of the light guide plate, a light-emitting side of the light source is next to the side surface of the light guide plate, another side of the light source is welded with the circuit board, and the circuit board is perpendicular to a light-exiting surface of the light guide plate; the light shielding tape overlaps a portion of the light-exiting surface of the light guide plate and covers the light source; the backlight module further comprising a heat-conducting housing, and the light source, the circuit board and the light guide plate are all located in the heat-conducting housing; the backlight module further comprising an auxiliary light shielding tape located between the light guide plate and the light shielding tape, wherein a plane where the light-exiting surface of the light guide plate is located is a target plane; the orthographic projection region of the auxiliary light shielding tape on the target plane is located within the orthographic projection region of the light shielding tape on the target plane; the backlight module further comprising: an optical film, a first transparent film, and a second transparent film, wherein an upper edge of the heat-conducting housing is provided with a bending portion that bends toward the inside of the heat-conducting housing, and the bending portion comprises a first platy structure, a second platy structure, a third platy structure and a fourth platy structure (205 ID) that are connected in sequence; wherein the first platy structure is perpendicular to the light exiting surface of the light guide plate; the second platy structure and the fourth platy structure (205 ID) are parallel with the target plane; the fourth platy structure (205 ID) is next to the light guide plate; and wherein the auxiliary light shielding tape and the first transparent film are superimposed on the light guide plate, and the auxiliary shielding light tape is also superimposed on the light source; the fourth platy structure is superimposed on an end of the auxiliary shielding light tape next to the light source; the second transparent film is superimposed on an end of the auxiliary light shielding tape away from the light source, and on the first transparent film; the optical film is superimposed on the second transparent film; and the light shielding tape is superimposed on the second platy structure and the optical film.