Apparatus and method utilizing an LCD for printing

Details Apparatus and method utilizing an LCD for printing Apparatus and method utilizing an LCD for printing

1989-07-31

1991-02-12

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

350331R, G03B 2780

Patent

active

049928244

ABSTRACT:
Method and apparatus which utilize an LCD modulator array for printing and/or enlarging an image recorded in a color film negative, a positive transparency or a color print, which LCD modulator array has pixels whose "closing time" (the time it takes to convert a pixel from a condition wherein it transmits radiation to a condition wherein it blocks radiation) is substantially longer than their "opening time" (the time it takes to convert a pixel from a condition wherein it blocks radiation to a condition wherein it transmits radiation). In accordance with the present invention, each pixel of the LCD modulator array is opened and closed in a rapid sequence, one after the other, at intervals which are much shorter than the closing time of the pixels of the LCD modulator array. The amount of radiation transmitted by each rapidly opened pixel is determined by detecting a spike of radiation which is transmitted through the rapidly opened pixel and by detecting and subtracting a background amount produced by radiation which is transmitted through other, slowly closing pixels.

REFERENCES:
patent: 4161363 (1979-07-01), Kahle
patent: 4264921 (1989-04-01), Pennington et al.
patent: 4595259 (1986-06-01), Perregaux
patent: 4601571 (1986-07-01), Yuasa et al.
patent: 4805012 (1989-02-01), Agostinelli et al.

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