Projection device and projection method, projection module, electronic device, and program

A projection method of a projection device, the projection device comprising:

• a laser light source configured to generate a laser beam according to a pixel signal of an input image;
• one mirror configured to reflect the laser beam generated by the laser light source and perform scanning to project the laser beam on a screen;
• a detection unit including at least one photodetector configured to detect a position of an optical axis of the laser beam generated by the laser light source;
• a correction coefficient calculation circuitry configured to calculate a correction coefficient for correcting an amount of shift of the laser beam on the basis of information regarding the position of the optical axis detected by the detection unit;
• and
• a correction circuitry configured to correct the pixel signal in the input image on the basis of the correction coefficient,
• the projection method comprising:
• generating the laser beam according to the pixel signal of the input image, by the laser light source;
• reflecting the laser beam generated by the laser beam generation unit and performing scanning to project the laser beam on the screen, by the mirror;
• detecting the position of the optical axis of the laser beam generated by the laser light source, by the at least one photodetector of the detection unit;
• calculating the correction coefficient for correcting the amount of shift of the laser beam on the basis of the information regarding the position of the optical axis detected by the detection unit, by the correction coefficient calculation circuitry;
• and
• correcting the pixel signal in the input image on the basis of the correction coefficient, by the correction circuitry, wherein
• the at least one photodetector is a plurality of photodetectors, each of which detects an amount of light of the laser beam in a corresponding area, the area being a two-dimensional plane substantially perpendicular to the optical axis of the laser beam, the area being divided into a plurality of sub-areas, and
• the detecting the position of the optical axis of the laser beam is performed on the basis of a ratio of the amount of light detected by each of the plurality of photodetectors.

A non-transitory computer-readable medium storing instructions that, when executed by a processor of a computer, cause the computer to function as:

• a laser light source configured to generate a laser beam according to a pixel signal of an input image;
• one mirror configured to reflect the laser beam generated by the laser light source and perform scanning to project the laser beam on a screen;
• a detection unit including at least one photodetector configured to detect a position of an optical axis of the laser beam generated by the laser light source;
• a correction coefficient calculation circuitry configured to calculate a correction coefficient for correcting an amount of shift of the laser beam on the basis of information regarding the position of the optical axis detected by the detection unit;
• and
• a correction circuitry configured to correct the pixel signal in the input image on the basis of the correction coefficient, wherein
• the at least one photodetector is a plurality of photodetectors, each of which detects an amount of light of the laser beam in a corresponding area, the area being a two-dimensional plane substantially perpendicular to the optical axis of the laser beam, the area being divided into a plurality of sub-areas, and
• the detection unit is configured to detect the position of the optical axis of the laser beam on the basis of a ratio of the amount of light detected by each of the plurality of photodetectors.

A projection module comprising:

• a laser light source configured to generate a laser beam according to a pixel signal of an input image;
• one mirror configured to reflect the laser beam generated by the laser light source and perform scanning to project the laser beam on a screen;
• a detection unit including at least one photodetector configured to detect a position of an optical axis of the laser beam generated by the laser light source;
• a correction coefficient calculation circuitry configured to calculate a correction coefficient for correcting an amount of shift of the laser beam on the basis of information regarding the position of the optical axis detected by the detection unit;
• and
• a correction circuitry configured to correct the pixel signal in the input image on the basis of the correction coefficient, wherein
• the at least one photodetector is a plurality of photodetectors, each of which detects an amount of light of the laser beam in a corresponding area, the area being a two-dimensional plane substantially perpendicular to the optical axis of the laser beam, the area being divided into a plurality of sub-areas, and
• the detection unit is configured to detect the position of the optical axis of the laser beam on the basis of a ratio of the amount of light detected by each of the plurality of photodetectors.

An electronic device comprising:

• a laser light source configured to generate a laser beam according to a pixel signal of an input image;
• one mirror configured to reflect the laser beam generated by the laser light source and perform scanning to project the laser beam on a screen;
• a detection unit including at least one photodetector configured to detect a position of an optical axis of the laser beam generated by the laser light source;
• a correction coefficient calculation circuitry configured to calculate a correction coefficient for correcting an amount of shift of the laser beam on the basis of information regarding the position of the optical axis detected by the detection unit;
• and
• a correction circuitry configured to correct the pixel signal in the input image on the basis of the correction coefficient, wherein
• the at least one photodetector is a plurality of photodetectors, each of which detects an amount of light of the laser beam in a corresponding area, the area being a two-dimensional plane substantially perpendicular to the optical axis of the laser beam, the area being divided into a plurality of sub-areas, and
• the detection unit is configured to detect the position of the optical axis of the laser beam on the basis of a ratio of the amount of light detected by each of the plurality of photodetectors.