LCD panel test apparatus having means for correcting data differ

Details LCD panel test apparatus having means for correcting data differ LCD panel test apparatus having means for correcting data differ

1996-05-20

1998-08-11

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

G01R 3122

Patent

active

057932212

ABSTRACT:
An LCD panel test apparatus for testing an LCD panel and compensating the differences in absolute values of measured data among two or more test apparatuses. The test apparatus includes: a backlight to illuminate the LCD panel under test; a CCD camera having a charge coupled device (CCD) sensor to monitor light signals; a filter to allow a predetermined color of light to pass therethrough; an LCD panel driver which provides a drive signal to the LCD panel under test; an analog-to-digital converter which converts the measured data from the CCD camera to digital data; a CCD address defining part which specifies positions of pixels in the CCD sensor corresponding to pixels of the LCD panel under test and specifies CCD sampling addresses for overall LCD pixels; an image data reproducing part to determine data corresponding to each pixel of the LCD panel under test based on the CCD sampling addresses; a defect determining part which determines defective pixels of the LCD panel under test; a correction table which stores correction coefficients; an image compensation part which compensates differences in measured data between two or more LCD panel test apparatuses using the correction coefficients; and a controller for controlling an overall operation of the LCD panel test apparatus.

REFERENCES:
patent: 5309108 (1994-05-01), Maeda et al.
patent: 5432461 (1995-07-01), Henley
patent: 5504438 (1996-04-01), Henley
patent: 5621334 (1997-04-01), Urano et al.

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