US 12,445,579 B2
Projection device and projection method thereof
Pen-Ning Kuo, Hsin-Chu (TW); and Fu-Shan Wang, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Oct. 24, 2022, as Appl. No. 17/971,649.
Claims priority of application No. 202111267687.1 (CN), filed on Oct. 29, 2021.
Prior Publication US 2023/0136066 A1, May 4, 2023
Int. Cl. H04N 9/31 (2006.01); G03B 21/14 (2006.01)
CPC H04N 9/312 (2013.01) [G03B 21/142 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A projection device, comprising: a spatial modulator, a first optical actuator, a second optical actuator, a driving circuit, and a control circuit; wherein
the spatial modulator is configured to modulate a beam to generate an image beam;
each of the first optical actuator and the second optical actuator has a plurality of modes, and the plurality of modes of the first actuator comprises a plurality of swinging modes and a non-driven mode, the plurality of modes of the second actuator comprises a first swinging mode and the non-driven mode;
the driving circuit is configured to receive an input video signal not from the control circuit, wherein the input video signal comprises a display frame, the driving circuit is coupled to the first optical actuator and the control circuit, and is configured to determine one of the plurality of modes of the first optical actuator and one of the plurality of modes of the second optical actuator according to the input video signal, wherein, the driving circuit is configured to convert the display frame of the input video signal into a plurality of sub-display frames corresponding to the determined mode of the first optical actuator and the determined mode of the second optical actuator, wherein each of the sub-display frames has a screen update frequency higher than a screen update frequency of the display frame, and the driving circuit is configured to send the sub-display frames to the control circuit, wherein the first optical actuator is configured to generate the plurality of swinging modes in a single-axis and a multi-axis manner respectively, wherein the driving circuit is a field programmable gate array; and
the control circuit is coupled to the spatial modulator and the second optical actuator respectively, wherein the control circuit is configured to control the spatial modulator to generate the image beam according to the sub-display frames that the control circuit receives from the driving circuit, and output synchronization signals corresponding to the sub-display frames to the driving circuit,
wherein when a resolution of the input video signal does not meet a maximum resolution supported by the control circuit and the spatial modulator:
the determined mode of the first optical actuator is one of the plurality of the swing modes, the first optical actuator is driven by the driving circuit to swing according to the synchronization signals and the determined mode of the first optical actuator;
the determined mode of the second optical actuator is the non-driven mode or the first swing mode, the second optical actuator is driven by the control circuit to swing according to the synchronization signals and the first swing mode, so as to change an optical path of the image beam to generate a projection image corresponding to the resolution of the input video signal, wherein the driving circuit supports the plurality of the swinging modes of the first optical actuator in the single-axis and the multi-axis manner, and the control circuit only supports the first swinging mode of the second optical actuator in the single-axis manner.