Patent ID: 7978152

Claim:
An LED display device for displaying a pattern on a rotatable object by light-scanning; wherein when the rotating object rotates with a high speed, the pattern will display; the device comprising: a display device for displaying at least one pattern; the display device being fixed without rotation in operation; the display screen being connected to one end of a power wire; the display device including a display screen, a processor and a memory; the processor serving to control displaying of patterns on the display device; the memory serving to store patterns to be displayed and other processing programs; a rotating printed circuit board having at least one bank of LEDs; the rotating printed circuit board being arranged on one side of a rotating body so that the rotating printed circuit board can be viewed easily; a control circuit board controlling electric conduction of each LED; the control circuit board having a switch bank; the switch bank including a plurality of switches; the switching operation of the switch bank being controlled by the control circuit board; each LED being connected to a conductive wire which is connected to one end of a corresponding switch; and another end of the switch being connected to a power source for supplying power to the LED to light up; and an image scanner connected to the control circuit board; the image scanner including a plurality of light sensors and a photoelectric converter; the photoelectric converter serving for converting sensed light into electric current; the image scanner can scan through the display screen of the display device so as to sense the pattern on the screen; then sensed light signals being converted into electric signals and then the electric signals being transferred to the control circuit board; and wherein the rotating printed circuit board, the control circuit board and the image scanner are arranged on the rotating body so as to rotate with the rotating body.