LCD panel test apparatus

Details LCD panel test apparatus LCD panel test apparatus

1996-04-24

1998-03-31

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324770, 324753, G01R 3100, G01R 31308

Patent

active

057341583

ABSTRACT:
An LCD panel test apparatus automatically detects defects of the LCD panel under test. The LCD panel test apparatus includes: a first polarizing plate provided above said LCD panel under test and having a predetermined polarizing direction; a second polarizing plate provided below the LCD panel having a polarizing direction perpendicular to that of the first polarizing plate; a back light provided under the second polarizing plate to illuminate the LCD panel; a camera to monitor light signals passing through the first polarizing plate; a third polarizing plate mounted on the same horizontal plane of the first polarizing plate; a polarizing plate driver for driving the first and third polarizing plates to place either one of the first or third polarizing plate right above the LCD; an analog-digital converter to convert an analog signal from the camera into digital data; an image processing CPU which performs a signal processes for the digital data received from the analog-digital converter; and an LCD panel driver which provides a drive signal to the LCD panel.

REFERENCES:
patent: 4983911 (1991-01-01), Henley
patent: 5235272 (1993-08-01), Henley
patent: 5444385 (1995-08-01), Henley
patent: 5459410 (1995-10-01), Henley
patent: 5614839 (1997-03-01), Bosacchi

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