Patent ID: 7717579

Claim:
An LED display device for displaying a pattern on a rotatable object; wherein when the rotating object rotates with a high speed, the pattern will display; the device comprising: a first printed circuit board on the rotatable object; at least one bank of light emitting diodes being arranged on the first printed circuit board; a second printed circuit board having a bank of elastic sheets; the number of the elastic sheets being corresponding to that of the light emitting diodes; a third printed circuit board having a pattern thereon; the pattern being made of conductive materials; the third printed circuit board do not rotate with the rotatable object; wherein the second printed circuit board having elastic sheets is installed on a rotating shaft of the rotatable object so that the first printed circuit board on the rotatable object and second printed circuit board having elastic sheets will rotate with the rotatable object; and the elastic sheets are capable of contacting the pattern of the third printed circuit board; and each elastic sheet is connected to a corresponding LED; the third printed circuit board is connected to all the light emitting diodes; as one elastic sheets is in contact with the pattern; the elastic sheet, pattern and one light emitting diode connected to the elastic sheets will form as a circuit loop; and the light emitting diode will light up.