A liquid crystal screen defect layered positioning method and device

Abstract

The invention relates to an embodiment disclosing a liquid crystal screen defect layered positioning method and device; the method comprises the following steps: controlling a plurality of cameras for imaging, wherein a camera view field overlap area covers a to-be-detected liquid crystal screen; using the to-be-detected liquid crystal screen surface as the reference surface, calibrating a mapping relation T between each camera image coordinate system; respectively mapping defect point image coordinates corresponding to each camera into the same image coordinate system according to the mapping relation T; determining whether the defect is on the reference surface or not according to the mapped corresponding defect point image coordinate deviation, and identifying inner / outer layer defects; in addition, using a mapping relation G between the camera image coordinates and object space coordinates to accurately calculate the defect point depth coordinate, thus determining the defect layer. Using various cameras to form the visual system, so the plane image defect detection can be improved to form stereo imaging, thus determining detect points and plane positions, obtaining depth information, completing defect points inner / outer layer positioning and grading, helping to remove interferences, and guiding technology improvement so as to ensure liquid crystal screen quality.

Description

technical field [0001] The invention relates to the technical field of liquid crystal screen defect detection, in particular to a liquid crystal screen defect layered positioning method and device. Background technique [0002] The liquid crystal screen is a device that uses liquid crystal material as the basic component, and changes the internal molecular arrangement of the liquid crystal material by changing the voltage to produce light-shielding and light-transmitting effects for image display. With the improvement of people's demand for LCD screens, LCD screens have formed a huge industry. [0003] Such as figure 1 As shown, it is a schematic diagram of the structure of a currently commonly used LCD screen. The LCD screen includes TP glass 01, upper polarizer 02, color filter 03, liquid crystal layer 04, TFT substrate 05, and lower polarizer from outside to inside. 06 and backlight 07. Wherein, the backlight source 07 provides light as a light source; the light emitte...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a liquid crystal screen defect layered positioning method and device to solve the problem that the liquid crystal screen defect detection in the prior art cannot quickly distinguish the internal defect of the liquid crystal screen from the external surface interference, and cannot locate the defect level

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