Stereoscopic Display Alignment Using Distributed Reference Marks

The patent divides the alignment reference system into multiple segments by forming alignment marks at both the upper and lower reference positions of the display panel. This segmentation allows the vision system to independently measure and correct alignment errors at each position, preventing accumulated errors across the entire filter and thereby maintaining manufacturing precision while keeping the device complexity manageable.

The patent transitions from a single-point alignment reference to a multi-point distributed reference system by adding alignment marks in the vertical dimension (both upper and lower positions). This dimensional expansion enables the vision system to detect and correct alignment errors more uniformly across the entire filter area, addressing the accumulated error problem without significantly increasing process complexity.

The patent applies local quality by positioning alignment marks specifically at the upper and lower reference positions where alignment errors are most critical. The vision system then uses these localized marks to perform targeted corrections in those areas, achieving high alignment precision where it matters most without the need for complex alignment processes across the entire filter surface.

The patent implements a feedback mechanism where the vision system captures images of the alignment marks at multiple positions, calculates alignment errors, and uses this feedback information to automatically adjust and correct the filter alignment. This closed-loop feedback process achieves high precision alignment while keeping the overall device complexity manageable through automation.

The patent introduces a vision system as an intermediary between the alignment marks and the alignment correction process. This intermediary automatically captures images of the alignment marks, calculates their positions, determines alignment errors, and provides feedback for correction. This automation significantly improves productivity and enables numerical quantification of alignment precision while keeping equipment costs reasonable compared to fully automated systems.

The patent replaces the manual mechanical alignment process (workers visually inspecting images and manually adjusting filters) with an automated optical measurement and control system. The vision system uses optical imaging to detect alignment mark positions and automatically calculates correction amounts, substituting human judgment and manual adjustment with automated optical-mechanical systems that improve both productivity and quantifiability.