Liquid crystal panel inspection method

Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel

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345 87, 345904, 324770, G09G 336

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053390938

ABSTRACT:
The present invention makes it possible for unskilled to inspect the total surface of a liquid crystal panel accurately in short time. It is defined that a liquid crystal panel can be divided into a single part which is a constituent, isolable, and an inspectable area, and that the single part to be "unit area of image" which is defined as a pattern to be inspected. Before the inspection, a unit area of an image without defect is selected from a liquid crystal panel to be inspected. The upper limit reference pattern and the lower limit reference pattern are generated by giving the maximal brightness in a convolution and adding the predetermined brightness and by giving the minimal brightness in the convolution and subtracting the predetermined brightness, respectively, to each pixel of the convolution. Comparing a brightness of each pixel of the upper limit and the lower limit reference pattern with a brightness of a pixel of a pattern to be inspected corresponding to it, the liquid crystal panel to be inspected is judged to be up to standard when more than a predetermined number of pixels are within the range between the upper limit and the lower limit brightness of the reference pattern.

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Mandeville, J., "Novel Method for Analysis of Printed Circuit Images", IBM Journal of Research and Development, vol. 29, No. 1, Jan. 1985, Armonk, N.Y., pp. 73-86.
Darwish, et al., "A Rule Based Approach for Visual Pattern Inspection", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, (1988) Jan., No. 1, New York, N.Y., pp. 56-68.
Chin, et al., "Automated Visual Inspection: A Survey", IEEE Transaction on Pattern Analysis and Machine Intelligence, vol. PAMI-4 (1982) No. 6, New York, N.Y., pp. 557-573.

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