Curved Display Panel Alignment Marks for Accurate Bonding Verification

The patent introduces a reference mark extending in a direction different from the alignment mark (e.g., perpendicular or at an angle), creating a two-dimensional reference system. This allows the detection system to measure positional accuracy by comparing the relative positions and orientations of both marks, rather than relying solely on the alignment mark distance which varies with observation angle. The reference mark provides an additional dimensional constraint that enables accurate error detection despite curved surface distortions.

The patent divides the quality verification function into separate components: alignment marks for positioning, reference marks for each display panel for individual accuracy checking, and optional first/second marks for additional verification. This segmentation allows each display panel's position accuracy to be independently verified using its own reference mark, even when multiple panels are bonded to a single front plate, thus maintaining ease of detection while improving productivity.