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Patent Searching and Data


Title:
OPTICAL INSPECTION APPARATUS FOR DEFECT OF LIQUID CRYSTAL DISPLAY
Document Type and Number:
Japanese Patent JPH05172759
Kind Code:
A
Abstract:

PURPOSE: To obtain the title apparatus not erroneously judging waste refuse as a defect.

CONSTITUTION: A liquid crystal display 3 is arranged on a movable stage 2 and the display pattern generated from a pattern generator 10 is displayed on the liquid crystal display 3 and the movable stage 2 is moved in one direction and the display pattern on the liquid crystal display 3 is read by a CCD unit 4. A personal computer 5 discriminates the coincidence of the read value and standard data and judges the pixel appearing when the pixel data at the time of the display of black becomes white from black and the pixel data at the time of the reversal display of white becomes white from white as waste refuse to discriminate the same from a deflective pixel.


Inventors:
MAEDA KAZUNARI
FUJITA YASUYUKI
Application Number:
JP1991000344765
Publication Date:
July 09, 1993
Filing Date:
December 26, 1991
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD
International Classes:
G01M11/00; G01N21/88; G01N21/93; G01N21/94; G02F1/13; (IPC1-7): G01M11/00; G01N21/88; G02F1/13
Attorney, Agent or Firm:
深見 久郎 (外2名)