Laser projection clock

A laser projection clock, comprising:

• a driving device comprising one or a plurality of rotating shafts and a power element for driving the one or a plurality of rotating shafts to rotate at different speeds respectively;
• one or a plurality of pointer light source devices configured on one side of the driving device to each output a laser beam, and each of the laser beam's output direction is adjustable;
• and
• one or a plurality of gratings configured on the one or a plurality of rotating shafts in a one-on-one manner in order to be rotated by the one or a plurality of rotating shafts respectively, wherein each said grating has an indication pattern, and the one or a plurality of laser beams are projected to a projection plane which is out of the laser projection clock by penetrating through the one or a plurality of indication patterns of the one or plurality of gratings to form one or a plurality of laser indications respectively, wherein the grating is a diffraction optical element or hologram with a plurality of structures whose width is smaller than one micrometer to produce a diffraction effect when the laser beam passes through the grating, the projection plane is on an opposite side of the gratings to the pointer light source devices, and each of the laser indications is rotated around one or a plurality of points on the projection plane for time displaying.