A liquid crystal screen alignment offset defect detection method
A technology of alignment offset and defect detection, which is applied in the direction of instruments, nonlinear optics, optics, etc., can solve the problems that affect the detection efficiency, cannot obtain clear images of two objects at the same time, increase the complexity of the process, and achieve low cost, The Effect of Fast LCD Screen Alignment Offset Detection
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[0021] Example: see figure 1 , a liquid crystal screen alignment defect detection method, the components of the liquid crystal screen to be tested include polarizers, glass, ITO electrodes, PI, and liquid crystals, and the method steps are as follows:
[0022] (1) The model of each part of the optical system is selected, and the optical system includes a camera, a lens, a point light source and an infrared light source;
[0023] Choose a camera with a wide spectral response area, which can perform the best effective response at 380NM to 1100NM; choose a coaxial telecentric lens as the best lens, with low distortion rate, strong magnification selectivity and high resolution
[0024] (2) Refer to figure 2 Install cameras, lenses, coaxial red light and ring-shaped infrared light sources, and LCD screens to be tested, test the imaging effects of different bands of infrared light sources and illumination heights, and determine the optimal band and installation height of the light...
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