Patent ID: 8854450

Claim:
An alignment method for assembling substrates in different spaces without fiducial mark, comprising steps of: a step (S 01 ) of pre-capturing at least two standard regional images of a first substrate and a second substrate, respectively, and pre-defining a standard character region in each of the standard regional images of the first and second substrates and storing character data of shapes of the standard character regions before assembling; a step (S 02 ) of disposing another to-be-aligned first substrate and another to-be-aligned second substrate in two different waiting spaces, respectively, and capturing at least two actual regional images of the first and second substrates when assembling; a step (S 03 ) of comparing the actual regional images of the first and second substrates with the character data of shapes of the corresponding standard character regions to obtain at least two actual character regions in each of the actual regional images matching with the corresponding standard character regions; a step (S 04 ) of building actual coordinate systems of the first and second substrates by using center coordinates of the actual character regions; a step (S 05 ) of comparing the actual coordinate systems of the first and second substrates to obtain a set of offset values ΔX, ΔY, Δθ of the first substrate on the X and Y axial directions and the rotational angle required to be moved from its waiting space to an alignment-and-installation space; and a step (S 06 ) of moving the first substrate to a correct waiting position in the alignment-and-installation space based on the set of offset values, and moving the second substrate to the other correct waiting position in the alignment-and-installation space based on a predetermined movement value; a step (S 07 ) of capturing the actual regional images of the first and second substrates in the alignment-and-installation space and calculating the coordinate values of the actual regional images, in order to ensure if the first and second substrates are disposed at the correct waiting positions in the alignment-and-installation space, respectively, if yes, then proceeding to a step (S 08 ); if not, then processing the step (S 07 ) again after the positions of the first and second substrates are fine tuned; and a step (S 08 ) of moving the first substrate along the Z axis in the alignment-and-installation space until the first substrate is aligned with the second substrate in the alignment-and-installation space to finish alignment and assembling.