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Title:
APPARATUS AND METHOD FOR INSPECTION OF IRREGULARITY IN CELL GAP OF LIQUID CRYSTAL PANEL AS WELL AS APPARATUS AND METHOD FOR MEASUREMENT OF CELL GAP
Document Type and Number:
Japanese Patent JP3665462
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an apparatus and a method in which the irregularity in a cell gap can be detected with high accuracy by a method wherein, among from a detected quantity of R light and a detected quantity of G light, that which is not smaller is set as a color for inspection and the quantity-of-light difference in the color for inspection between a first point and a second point is set as an index value for the irregularity in the cell gap.
SOLUTION: A color CCD camera 1 images the whole surface of a liquid crystal panel 101 on a backlight 110, and it outputs an R light receiving signal, a G light receiving signal and a B light receiving signal. The signals are input by an interface board 12 at a personal computer 10 via external input terminals 11. A CPU 15 detects, from the R light receiving signal, the G light receiving signal and the B light receiving signal, a quantity of R light and a quantity of G light in a first point P1 in the center of the liquid crystal face 101a of the liquid crystal panel 101 and in second points P2 to P5 in four corners. In addition, the magnitude of the detected quantity of R light and that of the detected quantity of G light are compared regarding one point (e.g. P1) among from the respective points. Among from the quantity of R light and the quantity of G light, that which is not smaller is set as a color for inspection. Then, the quantity-of-light difference in the color for inspection (R or G) between the point P1 and the points P2 to P5 is output as an index value for an irregularity in a cell gap.


Inventors:
堀口 宏貞
田中 勝
越川 耕一
Application Number:
JP1998000003542
Publication Date:
June 29, 2005
Filing Date:
January 09, 1998
Export Citation:
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Assignee:
セイコーエプソン株式会社
日本電子株式会社
International Classes:
G01B7/02; G01B11/06; G01M11/00; G02F1/13; G02F1/1339; (IPC1-7): G01M11/00; G01B11/06; G02F1/13
Domestic Patent References:
JP2251710A
JP9258223A
JP9133517A
JP3528564B2
Attorney, Agent or Firm:
上柳 雅誉
須澤 修