Projection system and method of operating the same

1 . A projection system, comprising:

at least one micro LED line configured for emitting lights with a changing frequency of X times per second; and

a scan optical system disposed at a downstream side of the at least one micro LED line, the scan optical system configured to scan the lights emitted from the at least one micro LED line with a scan rate of M seconds per scan and to project the lights emitted by the same one of the at least one micro LED line at different times to corresponding positions on a target projection plane for forming a picture on the target projection plane;

wherein the projection system has a horizontal resolution of N lines;

wherein a total number n of the at least one micro LED line is smaller than N; and

X=M *( N/n ).

2 . The projection system according to claim 1 , wherein the at least one micro LED line extends in a vertical direction and is arranged in a horizontal direction, each of the at least one micro LED line comprises a plurality of pixels, and each of the pixels comprises micro LEDs of different colors arranged in the vertical direction or the horizontal direction.

3 . The projection system according to claim 2 , wherein each of the pixels has a length in the vertical direction and a width in the horizontal direction, and the length and the width are not equal.

4 . A projection system, comprising:

at least one micro LED line configured for emitting lights with a changing frequency of X times per second; and

a scan optical system disposed at a downstream side of the at least one micro LED line, the scan optical system configured to scan the lights emitted from the at least one micro LED line with a scan rate of M seconds per scan and to project images formed of the lights to corresponding positions on a target projection plane;

wherein the projection system has a horizontal resolution of N lines;

wherein a total number n of the at least one micro LED line is smaller than N; and

X=M *( N/n );

wherein the at least one micro LED line extends in a vertical direction and is arranged in a horizontal direction, each of the at least one micro LED line comprises a plurality of pixels, and each of the pixels comprises micro LEDs of different colors arranged in the vertical direction or the horizontal direction; and

each of the micro LEDs has a length in the vertical direction and a width in the horizontal direction, and the width is larger than the length.

5 . The projection system according to claim 2 , wherein projected pixels on the target projection plane have a shape different from a shape of the corresponding pixels in the at least one micro LED line.

6 . The projection system according to claim 1 , wherein the scan optical system projects an i th image formed of the lights to a position on the target projection plane different from a position of an (i−1) th image on the target projection plane, wherein i≤X.

7 . The projection system according to claim 1 , wherein the scan optical system comprises a convex lens or a cylindrical lens.

8 . The projection system according to claim 7 , wherein the scan optical system further comprises a mirror.

9 . The projection system according to claim 1 , wherein at least one component of the scan optical system is movable in a horizontal direction and/or rotatable around a rotation axis extending in a vertical direction.

10 . The projection system according to claim 9 , wherein action of the component is driven and controlled by a mechanical system, a MEMS, a magnetic system, or a combination thereof.

11 . The projection system according to claim 1 , further comprising:

a scanning driver coupled to the at least one micro LED line, the scanning driver outputting driving signals at a signal frequency of X times per second to lighting the at least one micro LED line.

12 . A method of operating a projection system, comprising:

emitting lights with at least one micro LED line of the projection system at a changing frequency of X times per second; and

scanning the lights emitted from the at least one micro LED line with a scan rate of M seconds per scan and projecting the lights emitted by the same one of the at least one micro LED line at different times to corresponding positions on a target projection plane with a scan optical system of the projection system for forming a picture on the target projection plane;

wherein the projection system has a horizontal resolution of N lines;

wherein a total number n of the at least one micro LED line is smaller than N; and

X=M *( N/n ).

13 . The method according to claim 12 , wherein scanning the lights emitted from the at least one micro LED line and projecting the lights to the corresponding positions on the target projection plane comprises focusing the lights with a convex lens or a cylindrical lens.

14 . The method according to claim 13 , wherein scanning the lights emitted from the at least one micro LED line and projecting the lights to the corresponding positions on the target projection plane comprises scanning and projecting the lights with the convex lens or the cylindrical lens.

15 . The method according to claim 13 , wherein scanning the lights emitted from the at least one micro LED line and projecting the lights to the corresponding positions on the target projection plane further comprises scanning and projecting the lights with a mirror.

16 . The method according to claim 12 , wherein scanning the lights emitted from the at least one micro LED line comprises moving at least one component of the scan optical system in a horizontal direction and/or rotating at least one component of the scan optical system around a rotation axis extending in a vertical direction.

17 . The method according to claim 12 , wherein projecting the lights to the corresponding positions on the target projection plane comprises forming projected pixels on the target projection plane such that the projected pixels have a shape different from a shape of corresponding pixels in the at least one micro LED line.

18 . The method according to claim 12 , wherein projecting the lights to the corresponding positions on the target projection plane comprises projecting an i th image formed of the lights to a position on the target projection plane different from a position of an (i−1) th image on the target projection plane, wherein i≤X.

19 . The method according to claim 12 , further comprising:

outputting driving signals from a scanning driver at a signal frequency of X times per second to the at least one micro LED line so as to light the at least one micro LED line.