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 . <EOS>