Patent ID: 7898429

Claim:
An automatic angle-adjustable display device for showing images to be viewed by a viewer, the automatic angle-adjustable display device comprising: a screen showing the images; a first wireless transmitting and receiving sensor located at a first position of the screen for emitting a first wireless signal and receiving the first wireless signal reflected from the viewer; a second wireless transmitting and receiving sensor located at a second position of the screen for emitting a second wireless signal and receiving the second wireless signal reflected from the viewer; a third wireless transmitting and receiving sensor located at a third position of the screen for emitting a third wireless signal and receiving the third wireless signal reflected from the viewer; an angle adjustment mechanism connected to the screen for adjusting a viewing angle of the screen with respect to the viewer in response to a control signal; and a control unit communicated with the first wireless transmitting and receiving sensor, the second wireless transmitting and receiving sensor, the third wireless transmitting and receiving sensor and the angle adjustment mechanism for triggering the first, second and third wireless transmitting and receiving sensors to respectively emit the first, second and third wireless signals, calculating a first distance between the first position of the screen and the viewer, a second distance between the second position of the screen and the viewer and a third distance between the third position of the screen and the viewer according to the reflected first, second and third wireless signals, and calculating a first distance difference between the first distance and the second distance, a second distance difference between the third distance and the first distance and a third distance difference between the third distance and the second distance, thereby generating the control signal according to the first, second and third distance differences, wherein in response to the control signal, the angle adjustment mechanism is driven to adjust the viewing angle of the screen with respect to the viewer such that the first distance difference lies within a first predetermined range and the second and third distance differences lie within a second predetermined range.