A terminal device, comprising: a main unit; and a sub unit detachably connected to the main unit, the sub unit comprising: a display screen; a main circuit board; an auxiliary circuit board; and a piezoelectric ceramic receiver connected to the main circuit board or the auxiliary circuit board, wherein the display screen has a display surface, the main circuit board, the auxiliary circuit board and the piezoelectric ceramic receiver are located on a side of the display screen facing away from the display surface, characterized in that, the piezoelectric ceramic receiver is attached to the display screen, a region surrounded by a continuous hole wall of the main circuit board or the auxiliary circuit board defines an avoiding groove; or the main circuit board or the auxiliary circuit board has a notch provided on an edge thereof, and a region surrounded by the notch defines the avoiding groove, and the piezoelectric ceramic receiver is located in the avoiding groove, and the avoiding groove surrounds at least a part of the piezoelectric ceramic receiver, wherein an area of the main circuit board is greater than an area of the auxiliary circuit board, the auxiliary circuit board has the avoiding groove provided thereon, and the piezoelectric ceramic receiver is connected to the auxiliary circuit board; and the sub unit further comprises a flexible circuit board connected to the display screen, the flexible circuit board is located between the display screen and the main circuit board, and one end of the flexible circuit board extends to a side of the main circuit board facing away from the display screen via a peripheral position of the main circuit board and is connected to the main circuit board. a main unit; and a sub unit detachably connected to the main unit, the sub unit comprising: a display screen; a main circuit board; an auxiliary circuit board; and a piezoelectric ceramic receiver connected to the main circuit board or the auxiliary circuit board, a display screen; a main circuit board; an auxiliary circuit board; and a piezoelectric ceramic receiver connected to the main circuit board or the auxiliary circuit board, wherein the display screen has a display surface, the main circuit board, the auxiliary circuit board and the piezoelectric ceramic receiver are located on a side of the display screen facing away from the display surface, characterized in that, the piezoelectric ceramic receiver is attached to the display screen, a region surrounded by a continuous hole wall of the main circuit board or the auxiliary circuit board defines an avoiding groove; or the main circuit board or the auxiliary circuit board has a notch provided on an edge thereof, and a region surrounded by the notch defines the avoiding groove, and the piezoelectric ceramic receiver is located in the avoiding groove, and the avoiding groove surrounds at least a part of the piezoelectric ceramic receiver, wherein an area of the main circuit board is greater than an area of the auxiliary circuit board, the auxiliary circuit board has the avoiding groove provided thereon, and the piezoelectric ceramic receiver is connected to the auxiliary circuit board; and the sub unit further comprises a flexible circuit board connected to the display screen, the flexible circuit board is located between the display screen and the main circuit board, and one end of the flexible circuit board extends to a side of the main circuit board facing away from the display screen via a peripheral position of the main circuit board and is connected to the main circuit board.