Automatic alignment apparatus and associated method

An automatic alignment apparatus applicable to assembly of an optical output module, the automatic alignment apparatus comprising:

• an alignment tool, arranged to hold different parts of the optical output module, wherein the parts comprise a radiation source module and an optical component module;
• a beam splitter, positioned on an optical path that starts from the radiation source module, arranged to split the optical path into a first sub-path allowing first image contents being projected on a screen by the optical output module and a second sub-path allowing second image contents being projected toward a direction different from that of the screen by the optical output module;
• a first camera, arranged to capture at least one first image to generate a first image signal carrying the first image, wherein the first image corresponds to the first image contents projected on the screen by the optical output module;
• a plurality of second cameras, arranged to capture a plurality of second images to generate second image signals carrying the second images, respectively, wherein the second images correspond to the second image contents projected by the optical output module, respectively;
• and
• a processing circuit, arranged to generate at least one movement control signal according to at least one image signal within the first and the second image signals to perform movement control of at least one part of the parts;
• wherein the alignment tool is further arranged to automatically align the parts to each other according to the at least one movement control signal.