Display screen interlayer defect detection method and system

Abstract

The invention provides a display screen interlayer defect detection method and system. The method comprises the following steps: projecting N grating fringes with different phases to a reference planein one period, collecting N reference fringe patterns with corresponding phases, and obtaining a phase diagram of the reference plane; placing a display screen with a transparent interlayer on the reference plane, projecting N grating stripes with different phases to the display screen in one period, and collecting N detection stripe graphs with corresponding phases to obtain a phase diagram of adetection plane; and subtracting the phase diagram of the reference plane from the phase diagram of the detection plane to obtain a phase difference image, and obtaining the height distribution of adefect area in the reference plane according to the corresponding relation between the phase difference image and the actual height, thereby obtaining the position information of the defect area in the display screen interlayer. Compared with other methods, the method is higher in reliability and durability and lower in cost, and has the advantages of high sensitivity, high precision, quickness and the like.

Description

technical field [0001] The invention relates to the field of panel / display detection technology, in particular to a method and system for detecting interlayer defects of a display screen. Background technique [0002] At present, most display screens have a multi-layer structure, which are: cover glass, touch function layer, display layer and backlight panel from outside to inside. Therefore, in the process of producing the display screen, although it is in an ultra-clean workshop, it is inevitable that some defects and dust fall on the cover plate. Defects become NG products, which not only waste materials, but also waste production resources and time, and also increase the risk of NG of the whole machine. Therefore, it is the key control content in the production process, and it is also the difficulty of display module defect detection. [0003] At present, the detection of display screens mainly includes ultraviolet light irradiation method, spectral confocal detection,...

AI Technical Summary

Problems solved by technology

However, these detection systems all have high requirements for detection conditions or slow detection speed or low detection accuracy. For example, the ultraviolet light irradiation method has the risk of ultraviolet radiation, and other detection methods have complex mechanical structures / controls and require high precision. , high cost, low efficiency, time-consuming and other issues

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