LCD panel image quality inspection system and LCD image presampl

Details LCD panel image quality inspection system and LCD image presampl LCD panel image quality inspection system and LCD image presampl

1995-07-14

1997-07-22

Font, Frank

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

348180, G01N 2100

Patent

active

056508441

ABSTRACT:
The contrast of an LCD panel is accurately measured with a small number of CCD pixels when measuring the LCD panel using a CCD camera. Therefore, a CCD area sensor is used in the CCD camera in this invention. An LCD driver section displays a calibration pattern or test patterns on the LCD panel to be inspected. An image measuring section performs A/D conversion on the contrast detected by the CCD pixels, and a CCD address setting means of the LCD pixels specifies the positions of the LCD pixels and the positions of the corresponding CCD pixels using luminescent spots of a calibration pattern. The address setting means determines the sampling addresses of each of the LCD pixels from the addresses of the luminescent spots using real number calculations. A presampling processing means converts the measured image to an image with the same number of pixels as the pattern on the LCD panel by means of linear interpolation.

REFERENCES:
patent: 5351201 (1994-09-01), Harshbarger et al.

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