Patent ID: 7403216
Filing Date: 2008-07-22
Classification: G03B,G03F

Abstract:
1. A method for fabricating a printing plate using a liquid crystal display comprising: obtaining a red (R) film; positioning the red (R) film using a film support formed in U shape; aligning the red (R) film above a liquid crystal display that omits color filters; displaying on the display a red color image pattern in gray scale representing each concentrations of a red color in a document to be reproduced; illuminating the red (R) film through the display to expose a light having an amount of light corresponding to each of the concentrations of the red color image pattern onto the red (R) film while displaying the red color image pattern; obtaining a green (G) film: positioning the green (G) film using the film support formed in U shape; aligning the green (G) film above the liquid crystal display that omits color filters; displaying on the display a green image pattern representing each concentrations of a green color in the document to be reproduced; illuminating the green (G) film through the display to expose a light having an amount of light corresponding to each of the concentrations of the green image pattern onto the green (G) film while displaying the green color image pattern; obtaining a blue (B) film: positioning the blue (B) film using the film support formed in U shape; aligning the blue (B) the display to expose the blue image pattern onto the blue (B) film while displaying the green color image pattern; displaying on the display a blue image pattern representing each concentrations of a blue color in the document to be reproduced; illuminating the blue (B) film through the display to expose a light having an amount of light corresponding to each of the concentrations of the blue image pattern onto the blue (B) film while displaying the blue color image pattern; preparing a first, a second and a third plates to pour an ammonium dichromate photosensitive liquid onto the first, the second and the third plates; illuminating the first plate through the red film; illuminating the second plate through the green film; and illuminating the third plate through the blue film.