Method and apparatus for adjusting the relative positioning of p

Details Method and apparatus for adjusting the relative positioning of p Method and apparatus for adjusting the relative positioning of p

1977-12-20

1980-09-30

Corbin, John K.

Optics: measuring and testing

By alignment in lateral direction

With light detector

G01B 1114

Patent

active

042252415

ABSTRACT:
A method and apparatus for adjusting the relative positioning of planar transparent objects, such as the two glass plates of a liquid crystal display, (LCD). Textured transparent markings are disposed on the planar transparent objects. Thereafter a collimated light beam is passed through the transparent textured markings and refracted thereby. Images of the textured markings are observed and detected, whereupon the relative positioning of the planar transparent objects is adjusted until the detected images are aligned in a predetermined spatial orientation. Also disclosed is a novel liquid crystal display having the transparent textured markings provided on the transparent electrode layers of the LCD device.

REFERENCES:
patent: 4062623 (1977-12-01), Suzuki et al.
Harper et al., "Aligning and Inpsecting Microelectronic Circuits", IBM Technical Disclosure Bulletin, vol. 13, No. 4, Sep. 1970, pp. 1028-1029.
Abraham et al., "Reverse Dark Field Lens", IBM Technical Disclosure Bulletin, vol. 19, No. 9, Feb. 1977, pp. 3417-3418.

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