a cabinet frame, comprising a power box and a plurality of sub-frames located on the left side and the right side of the power box, wherein the sub-frames on each side are arranged sequentially in a vertical direction;

a plurality of display modules, wherein the plurality of the display modules corresponds to a plurality of the sub-frames on a one-to-one basis, a drive circuit and mounting members of the display module are both provided on a left side and/or right side region, a middle region of the display module is uniformly distributed with a hole structure for sound transmission, and the display module is mounted on a corresponding sub-frame via the mounting members of the left side and/or right side region,

wherein the power box comprises a body and a rear cover, and an anti-theft lock and a first micro-switch are fitted between the rear cover and the body,

wherein the display module comprises a PCB board, a mask provided on a light-emitting surface of the PCB board, and a metal plate provided on a drive surface of the PCB board, wherein a second micro-switch and a third micro-switch are provided on a left side and/or right side region of the drive surface of the PCB board,

wherein the first micro-switch, the second micro-switch, and the third micro-switch are all connected to a safety monitoring circuit or a safety execution circuit,

wherein the first micro-switch is triggered when the rear cover is pried, the second micro-switch is triggered when the metal plate is pried, the third micro-switch is triggered when the display module is stolen and dismantled, such that a security prompt is issued or a security action is executed to prevent data information from being stolen,

wherein the mask is made of an electromagnetic shielding material,

wherein the hole structure for sound transmission comprises first sound transmission holes provided in a middle region of the light-emitting surface of the PCB board, and the first sound transmission holes are metallized holes.